text stringlengths 89 2.49k | category stringclasses 19
values |
|---|---|
Spectral distortions in the cosmic microwave background polarization: We compute the spectral distortions of the Cosmic Microwave Background (CMB)
polarization induced by non-linear effects in the Compton interactions between
CMB photons and cold intergalactic electrons. This signal is of the $y$-type
and is dominated ... | astro-ph_CO |
Evidence of major dry mergers at M* > 2 x 10^11 Msun from curvature in
early-type galaxy scaling relations?: For early-type galaxies, the correlations between stellar mass and size,
velocity dispersion, surface brightness, color, axis ratio and color-gradient
all indicate that two mass scales, M* = 3 x 10^10 Msun and... | astro-ph_CO |
Baryonic effects on weak-lensing two-point statistics and its
cosmological implications: We develop an extension of \textit{the Halo Model} that describes
analytically the corrections to the matter power spectrum due to the physics of
baryons. We extend these corrections to the weak-lensing shear angular power
spectr... | astro-ph_CO |
Galaxy And Mass Assembly (GAMA): Spectroscopic analysis: The Galaxy And Mass Assembly (GAMA) survey is a multiwavelength photometric
and spectroscopic survey, using the AAOmega spectrograph on the
Anglo-Australian Telescope to obtain spectra for up to ~300000 galaxies over
280 square degrees, to a limiting magnitude of... | astro-ph_CO |
Some results on the radio-SZ correlation for galaxy cluster radio halos: We present correlation results for the radio halo power in galaxy clusters
with the integrated thermal Sunyaev-Zel'dovich (SZ) effect signal, including
new results obtained at sub-GHz frequencies. The radio data is compiled from
several published ... | astro-ph_CO |
Effective dark matter power spectra in $f(R)$ gravity: Using N-body simulations, we measure the power spectrum of the effective dark
matter density field, which is defined through the modified Poisson equation in
$f(R)$ cosmologies. We find that when compared to the conventional dark matter
power spectrum, the effectiv... | astro-ph_CO |
Measuring the growth of structure with intensity mapping surveys: Line intensity mapping offers a new avenue for constraining cosmological
parameters in the high redshift Universe. However measurements of the growth of
structure, a sensitive probe of gravity, are affected by a well known
degeneracy with astrophysical p... | astro-ph_CO |
The NGC 404 Nucleus: Star Cluster and Possible Intermediate Mass Black
Hole: We examine the nuclear morphology, kinematics, and stellar populations in
nearby S0 galaxy NGC 404 using a combination of adaptive optics assisted
near-IR integral-field spectroscopy, optical spectroscopy, and HST imaging.
These observations... | astro-ph_CO |
Detecting relic gravitational waves in the CMB: Optimal parameters and
their constraints: The prospect of detecting relic gravitational waves (RGWs), through their
imprint in the cosmic microwave background radiation, provides an excellent
opportunity to study the very early Universe. In simplest viable theoretical
m... | astro-ph_CO |
Light Primordial Exotic Compact Objects as All Dark Matter: The radiation emitted by horizonless exotic compact objects (ECOs), such as
wormholes, 2-2-holes, fuzzballs, gravastars, boson stars, collapsed polymers,
superspinars etc., is expected to be strongly suppressed when compared to the
radiation of black holes. If... | astro-ph_CO |
Cosmology and fundamental physics with the ELT-ANDES spectrograph: State-of-the-art 19th century spectroscopy led to the discovery of quantum
mechanics, and 20th century spectroscopy led to the confirmation of quantum
electrodynamics. State-of-the-art 21st century astrophysical spectrographs,
especially ANDES at ESO's ... | astro-ph_CO |
The Massive and Distant Clusters of WISE Survey: SZ effect Verification
with the Atacama Compact Array -- Localization and Cluster Analysis: The Massive and Distant Clusters of WISE Survey (MaDCoWS) provides a catalog
of high-redshift ($0.7\lesssim z\lesssim 1.5$) infrared-selected galaxy
clusters. However, the verif... | astro-ph_CO |
The SINS survey: modeling the dynamics of z~2 galaxies and the high-z
Tully-Fisher relation: We present the modeling of SINFONI integral field dynamics of 18 star forming
galaxies at z ~ 2 from Halpha line emission. The galaxies are selected from the
larger sample of the SINS survey, based on the prominence of ordere... | astro-ph_CO |
On the stability criteria for equatorial circular orbits in Galactic
Dynamics: I.Newtonian Thin Disks: We make a revision of the stability criteria for equatorial circular orbits,
obtained from the epicyclic approximation, which is widely used in Newtonian
models for axisymmetric galaxies. We find that, for the case ... | astro-ph_CO |
Testing Gravity Using Large-Scale Redshift-Space Distortions: We use Luminous Red Galaxies from the Sloan Digital Sky Survey II to test the
cosmological structure growth in two alternatives to the standard LCDM+GR
cosmological model. We compare observed three-dimensional clustering in SDSS
DR7 with theoretical predicti... | astro-ph_CO |
Intrinsic colors and ages of extremely red elliptical galaxies at high
redshift: In order to know the formation epoch of the oldest elliptical galaxies as a
function of mass and observed redshift, a statistical analysis for 333
extremely red objects (EROs) classified as old galaxies (OGs) at 0.8<z<2.3 is
carried out.... | astro-ph_CO |
Dwarf elliptical galaxies as ancient tidal dwarf galaxies: The formation of tidal dwarf galaxies (TDGs) is triggered by the encounters
of already existing galaxies. Their existence is predicted from numerical
calculations of encountering galaxies and is also well documented with
observations. The numerical calculations... | astro-ph_CO |
Cosmic Microwave Background temperature and polarization anisotropies
from the large-N limit of global defects: We determine the full C_l spectra and correlation functions of the
temperature and polarization anisotropies in the CMB, generated by a source
modeled by the large N limit of spontaneously broken global O(N... | astro-ph_CO |
Using Elliptical Galaxy Kinematics to Compare of the Strength of Gravity
in Cosmological Regions of Differing Gravitational Potential -- A First Look: Various models of modified gravity invoke ``screening'' mechanisms that are
sensitive to the value of the local gravitational potential. This could have
observable con... | astro-ph_CO |
The effects of primordial non-Gaussianity on giant-arc statistics: For over a decade, it has been debated whether the concordance LCDM model is
consistent with the observed abundance of giant arcs in clusters. While
previous theoretical studies have focused on properties of the lens and source
populations, as well as c... | astro-ph_CO |
The role of Pop III stars and early black holes in the 21cm signal from
Cosmic Dawn: Modeling the 21cm global signal from the Cosmic Dawn is challenging due to
the many poorly constrained physical processes that come into play. We address
this problem using the semi-analytical code "Cosmic Archaeology Tool" (CAT).
CA... | astro-ph_CO |
Causality, initial conditions, and inflationary magnetogenesis: The post-inflationary evolution of inflation-produced magnetic fields,
conventional or not, can change dramatically when two fundamental issues are
accounted for. The first is causality, which demands that local physical
processes can never affect superhor... | astro-ph_CO |
Testing Dvali-Gabadadze-Porrati Gravity with Planck: Recently, the Planck collaboration has released the first cosmological papers
providing the highest resolution, full sky, maps of the cosmic microwave
background (CMB) temperature anisotropies. In this paper we study a
phenomenological model which interpolates betwee... | astro-ph_CO |
Confronting Models of Dwarf Galaxy Quenching with Observations of the
Local Group: A number of mechanisms have been proposed to connect star-forming dwarf
irregular galaxies with the formation of non-star-forming dwarf spheroidal
galaxies, but distinguishing between these mechanisms has been difficult. We
use the Via... | astro-ph_CO |
The Copernicus Complexio: a high-resolution view of the small-scale
Universe: We introduce Copernicus Complexio (COCO), a high-resolution cosmological
N-body simulation of structure formation in the $\Lambda{\rm CDM}{}$ model.
COCO follows an approximately spherical region of radius $\sim 17.4h^{-1}\,{\rm
Mpc}$ embed... | astro-ph_CO |
KiDS-450: Cosmological Constraints from Weak Lensing Peak Statistics -
II: Inference from Shear Peaks using N-body Simulations: We study the statistics of peaks in a weak lensing reconstructed mass map of
the first 450 square degrees of the Kilo Degree Survey. The map is computed
with aperture masses directly applied... | astro-ph_CO |
Curvature Perturbations Protected Against One Loop: We examine one-loop corrections from small-scale curvature perturbations to
the superhorizon-limit ones in single-field inflation models, which have
recently caused controversy. We consider the case where the Universe
experiences transitions of slow-roll (SR) $\to$ in... | astro-ph_CO |
The extraordinary mid-infrared spectral properties of FeLoBAL Quasars: We present mid-infrared spectra of six FeLoBAL QSOs at 1<z<1.8, taken with
the Spitzer space telescope. The spectra span a range of shapes, from hot dust
dominated AGN with silicate emission at 9.7 microns, to moderately obscured
starbursts with str... | astro-ph_CO |
Cosmology at the boundary of de Sitter using the dS/QFT correspondence: Using the dS/QFT correspondence in the context of inflation allows for the
study of interesting, otherwise inaccessible physics. In particular, by
studying inflation via its dual field theory at the boundary of the de Sitter
space, it may be possib... | astro-ph_CO |
Inhomogeneities in the universe: Standard models of galaxy formation predict that matter distribution is
statistically homogeneous and isotropic and characterized by (i) spatial
homogeneity for r<10 Mpc/h, (ii) small-amplitude structures of relatively
limited size (i.e., r<100) Mpc/h and (iii) anti-correlations for r >... | astro-ph_CO |
A survey of molecular gas in luminous sub-millimetre galaxies: We present the results from a survey for 12CO emission in 40 luminous
sub-millimetre galaxies (SMGs), with 850um fluxes of S850 = 4 - 20 mJy,
conducted with the Plateau de Bure Interferometer. We detect 12CO emission in
32 SMGs at z~1.2 - 4.1, including 16 ... | astro-ph_CO |
Massive and Newly Dead: Discovery of a Significant Population of
Galaxies with High Velocity Dispersions and Strong Balmer Lines at z~1.5 from
Deep Keck Spectra and HST/WFC3 Imaging: We present deep Keck/LRIS spectroscopy and HST/WFC3 imaging in the rest-frame
optical for a sample of eight galaxies at z~1.5 with hi... | astro-ph_CO |
Multiphase Signatures of AGN Feedback in Abell 2597: We present new Chandra X-ray observations of the brightest cluster galaxy
(BCG) in the cool core cluster Abell 2597. The data reveal an extensive
kpc-scale X-ray cavity network as well as a 15 kpc filament of soft-excess gas
exhibiting strong spatial correlation with... | astro-ph_CO |
Virial halo mass function in the ${\it Planck}$ cosmology: We study halo mass functions with high-resolution $N$-body simulations under
a $\Lambda$CDM cosmology. Our simulations adopt the cosmological model that is
consistent with recent measurements of the cosmic microwave backgrounds with
the ${\it Planck}$ satellite... | astro-ph_CO |
A New Probe of the High-z BAO scale: BAO tomography With CMB $\times$
LIM-Nulling Convergence: Standard rulers such as the baryon acoustic oscillation (BAO) scale serve as
workhorses for precision tests of cosmology, enabling distance measurements
that probe the geometry and expansion history of our Universe. Aside f... | astro-ph_CO |
The Trispectrum in the Effective Theory of Inflation with Galilean
symmetry: We calculate the trispectrum of curvature perturbations for a model of
inflation endowed with Galilean symmetry at the level of the fluctuations
around an FRW background. Such a model has been shown to posses desirable
properties such as uni... | astro-ph_CO |
Bridging the gap: spectral distortions meet gravitational waves: Gravitational waves (GWs) have the potential to probe the entirety of
cosmological history due to their nearly perfect decoupling from the thermal
bath and any intervening matter after emission. In recent years, GW cosmology
has evolved from merely being ... | astro-ph_CO |
Accurate AGN black hole masses and the scatter in the M_{bh} - L_{bulge}
relationship: A new empirical formulae is given for estimating the masses of black holes in
AGNs from the H beta velocity dispersion and the continuum luminosity at 5100
Angstroms. It is calibrated to reverberation-mapping and stellar-dynamical
... | astro-ph_CO |
H0LiCOW I. $H_0$ Lenses in COSMOGRAIL's Wellspring: Program Overview: Strong gravitational lens systems with time delays between the multiple
images allow measurements of time-delay distances, which are primarily
sensitive to the Hubble constant that is key to probing dark energy, neutrino
physics, and the spatial curv... | astro-ph_CO |
The effect of massive neutrinos on the BAO peak: We study the impact of neutrino masses on the shape and height of the BAO
peak of the matter correlation function, both in real and redshift space. In
order to describe the nonlinear evolution of the BAO peak we run N-body
simulations and compare them with simple analyti... | astro-ph_CO |
Intrinsic brightness of SDSS objects is similar at all redshifts in de
Sitter space: The redshift-luminosity distributions for well-defined galaxies and quasars
in the Sloan Digital Sky Survey (SDSS) are compared for the two
redshift-distance relations of a Hubble redshift and a de Sitter redshift.
Assuming a Hubble ... | astro-ph_CO |
Observational constraints on the tilted spatially-flat and the untilted
nonflat $φ$CDM dynamical dark energy inflation models: We constrain spatially-flat tilted and nonflat untilted scalar field ($\phi$)
dynamical dark energy inflation ($\phi$CDM) models by using Planck 2015 cosmic
microwave background (CMB) anisotr... | astro-ph_CO |
Cosmic transparency and acceleration: In this paper, by considering an absorption probability independent of photon
wavelength, we show that current type Ia supernovae (SNe Ia) and gamma ray
burst (GRBs) observations plus high-redshift measurements of the cosmic
microwave background (CMB) radiation temperature support ... | astro-ph_CO |
Swift BAT, Fermi LAT, and the Blazar Sequence: Using public \fermi LAT and \swift BAT observations, we constructed the first
sample of blazars selected at both hard X-rays and gamma-rays. Studying its
spectral properties, we find a luminosity dependence of the spectral slopes at
both energies. Specifically, luminous bl... | astro-ph_CO |
B-mode in CMB polarization. What's that and why it is interesting: Generation of the B-mode of CMB polarization by background of relic
gravitational wave is discussed in connection with the BICEP2 measurements.
Description of the polarization maps in terms of the eigenvectors of the
polarization matrix is considered. | astro-ph_CO |
Post-Planck Dark Energy Constraints: We constrain plausible dark energy models, parametrized by multiple candidate
equation of state, using the recently published Cosmic Microwave Background
(CMB) temperature anisotropy data from Planck together with the WMAP-9
low-$\ell$ polarization data and data from low redshift su... | astro-ph_CO |
Gravitational waves, dark energy and inflation: In this paper we first present a complete classification of gravitational
waves according to their frequencies: (i) Ultra high frequency band (above 1
THz); (ii) Very high frequency band (100 kHz - 1 THz); (iii) High frequency
band (10 Hz - 100 kHz); (iv) Middle frequency... | astro-ph_CO |
Testing flatness of the universe with probes of cosmic distances and
growth: When using distance measurements to probe spatial curvature, the geometric
degeneracy between curvature and dark energy in the distance-redshift relation
typically requires either making strong assumptions about the dark energy
evolution or ... | astro-ph_CO |
Effects of a Late Gravitational Transition on Gravitational Waves and
Anticipated Constraints: We investigate the evolution of gravitational waves through discontinuous
evolution (transition) of the Hubble expansion rate $H(z)$ at a sudden
cosmological singularity, which may be due to a transition of the value of the... | astro-ph_CO |
Cosmic string loop shapes: We analyze the shapes of cosmic string loops found in large-scale simulations
of an expanding-universe string network. The simulation does not include
gravitational back reaction, but we model that process by smoothing the loop
using Lorentzian convolution. We find that loops at formation con... | astro-ph_CO |
The sub-mJy radio population of the E-CDFS: optical and infrared
counterpart identification: We study a sample of 883 sources detected in a deep Very Large Array survey
at 1.4 GHz in the Extended Chandra Deep Field South. The paper focuses on the
identification of their optical and infrared (IR) counterparts. We use ... | astro-ph_CO |
Calibrated Ultra Fast Image Simulations for the Dark Energy Survey: Weak lensing by large-scale structure is a powerful technique to probe the
dark components of the universe. To understand the measurement process of weak
lensing and the associated systematic effects, image simulations are becoming
increasingly importa... | astro-ph_CO |
Metals and ionizing photons from dwarf galaxies: We estimate the potential contribution of M < 10^9 Msun dwarf galaxies to the
reionization and early metal-enrichment of the Milky Way environment, or
circum-Galactic Medium. Our approach is to use the observed properties of
ancient stars (> 12 Gyr old) measured in nearb... | astro-ph_CO |
The Evolution and Eddington Ratio Distribution of Compton Thick Active
Galactic Nuclei: Previous studies of the active galactic nuclei (AGN) contribution to the
cosmic X-ray background (CXB) consider only observable parameters such as
luminosity and absorbing column. Here, for the first time, we extend the study
of t... | astro-ph_CO |
Environmental Effects on the Star Formation Activity in Galaxies at
z=1.2 in the COSMOS Field: We investigate the relation between the star-formation activity in galaxies
and environment at z=1.2 in the COSMOS field, using the fraction of [OII]
emitters and the local galaxy density. The fraction of [OII] emitters app... | astro-ph_CO |
Light Fields during Inflation from BOSS and Future Galaxy Surveys: Primordial non-Gaussianity generated by additional fields present during
inflation offers a compelling observational target for galaxy surveys. These
fields are of significant theoretical interest since they offer a window into
particle physics in the i... | astro-ph_CO |
Multiband Comparative Study of Optical Microvariability in RL vs. RQ
Quasars: We present the results of an optical multi-band (BVR) photometric monitoring
program of 22 core-dominated radio-loud quasars (CRLQs) and 22 radio-quiet
quasars (RQQs). The aim was to compare the properties of microvariability in
both types ... | astro-ph_CO |
Connecting massive galaxies to dark matter halos in BOSS - I. Is galaxy
color a stochastic process in high-mass halos?: We use subhalo abundance matching (SHAM) to model the stellar mass function
(SMF) and clustering of the Baryon Oscillation Spectroscopic Survey (BOSS)
"CMASS" sample at $z\sim0.5$. We introduce a no... | astro-ph_CO |
X-ray observations of the merging cluster CIZA J2242.8+5301: Multiwavelength studies of radio relics at merger shocks set powerful
constraints on the relics origin and formation mechanism. However, for X-ray
observations, a main difficulty is represented by the low X-ray surface
brightness far out in the cluster outski... | astro-ph_CO |
Detectability of the cross-correlation between CMB lensing and
stochastic GW background from compact object mergers: The anisotropies of the Stochastic Gravitational-Wave Background (SGWB)
produced by merging compact binaries constitute a possible new probe of the
Large-Scale Structure (LSS). However, the significant... | astro-ph_CO |
A unique isolated dwarf spheroidal galaxy at D=1.9 Mpc: We present a photometric and spectroscopic study of the unique isolated
nearby dSph galaxy KKR25. The galaxy was resolved into stars with HST/WFPC2
including old red giant branch and red clump. We have constructed a model of
the resolved stellar populations and me... | astro-ph_CO |
Cross-Correlation of Diffuse Synchrotron and Large-Scale Structures: We explore for the first time the method of cross-correlation of radio
synchrotron emission and tracers of large-scale structure in order to detect
the diffuse IGM/WHIM. We performed a cross-correlation of a 34 x 34 degree area
of 2MASS galaxies for t... | astro-ph_CO |
The Brightest of Reionizing Galaxies (BoRG) survey: Until now, investigating the early stages of galaxy formation has been
primarily the realm of theoretical modeling and computer simulations, which
require many physical ingredients and are challenging to test observationally.
However, the latest Hubble Space Telescope... | astro-ph_CO |
Episodic Star Formation Coupled to Reignition of Radio Activity in 3C
236: We present Hubble Space Telescope UV and optical imaging of the radio galaxy
3C 236, whose relic 4 Mpc radio jet lobes and inner 2 kpc CSS radio source are
evidence of multiple epochs of AGN activity. Our data confirm the presence of
four brig... | astro-ph_CO |
Cosmological constraints from multiple tracers in spectroscopic surveys: We use the Fisher matrix formalism to study the expansion and growth history
of the Universe using galaxy clustering with 2D angular cross-correlation
tomography in spectroscopic or high resolution photometric redshift surveys.
The radial informat... | astro-ph_CO |
The early-type dwarf galaxy population of the Centaurus cluster: We present a photometric study of the early-type dwarf galaxy population of
the Centaurus cluster, aiming at investigating the galaxy luminosity function
(LF) and galaxy scaling relations down to the regime of galaxies with M_V~-10
mag. On deep VLT/FORS1 ... | astro-ph_CO |
Sunyaev Zel'dovich effect in galaxy clusters cavities: thermal or
non-thermal origin?: Several galaxy clusters host X-ray cavities, often filled with relativistic
electrons emitting in the radio band. In the cluster MS 0735.6+7421 the
cavities have been detected through the Sunyaev Zel'dovich (SZ) effect, but it
has ... | astro-ph_CO |
Calibrating Gamma-Ray Bursts by Using a Gaussian Process with Type Ia
Supernovae: In this paper, we calibrate the Amati relation (the $E_{\rm p}$-${E}_{\rm
iso}$ correlation) of gamma-ray bursts (GRBs) in a cosmology-independent way.
By using Gaussian process to reconstruct the smoothed luminosity distance from
the P... | astro-ph_CO |
A Spectroscopic Model of the Type Ia Supernova--Host Galaxy Mass
Correlation from SALT3: The unknown cause of the correlation between Type Ia supernova (SN Ia) Hubble
residuals and their host-galaxy masses (the "mass step") may bias cosmological
parameter measurements. To better understand the mass step, we develop a... | astro-ph_CO |
The last breath of the young gigahertz-peaked spectrum radio source PKS
1518+047: We present the results from multi-frequency VLBA observations from 327 MHz to
8.4 GHz of the gigahertz-peaked spectrum radio source PKS 1518+047 (4C 04.51)
aimed at studying the spectral index distribution across the source. Further
mul... | astro-ph_CO |
Caustic and hydrostatic mass bias: Implications for modified gravity: We propose and perform a joint analysis of the two different mass estimates
of galaxy clusters, namely the hydrostatic and caustic techniques. Firstly, we
show comprehensively that the mass bias between these two techniques can be
possibly alleviated... | astro-ph_CO |
Large-scale asymmetry in the distribution of galaxy spin directions --
analysis and reproduction: Recent independent observations using several different telescope systems an
analysis methods have provided evidence of parity violation between the number
of galaxies that spin in opposite directions. On the other hand,... | astro-ph_CO |
An influence of the matter distribution on the positional accuracy of
reference sources: We consider an influence of a non-stationary gravitational field of the
Galaxy on the visible positions of extragalactic sources. A contribution of the
baryonic component of the galactic matter as well as of the hidden matter
(in... | astro-ph_CO |
X-ray emission around the z=4.1 radio galaxy TNJ1338-1942 and the
potential role of far-infrared photons in AGN Feedback: We report the discovery in an 80-ks observation of spatially-extended X-ray
emission around the high-redshift radio galaxy TNJ1388-1942 (z=4.11) with the
Chandra X-ray Observatory. The X-ray emiss... | astro-ph_CO |
Deblending Galaxies with Generative Adversarial Networks: Deep generative models including generative adversarial networks (GANs) are
powerful unsupervised tools in learning the distributions of data sets.
Building a simple GAN architecture in PyTorch and training on the CANDELS data
set, we generate galaxy images with... | astro-ph_CO |
Stellar population and the origin of intra-cluster stars around
brightest cluster galaxies: the case of NGC 3311: Context. We investigate the stellar population and the origin of diffuse
light around brightest cluster galaxies.
Aims. We study the stellar population of the dynamically hot stellar halo of
NGC 3311, t... | astro-ph_CO |
Big Bang Nucleosynthesis: As the early universe expands and cools the rates of the weak interactions
that keep neutrinos in thermal equilibrium with the matter and the related
rates of the reactions that inter-convert neutrons and protons decrease.
Eventually, these rates fall below the expansion rate -- they freeze ou... | astro-ph_CO |
First results on the search for dark matter in the Sun with the ANTARES
neutrino telescope: The ANTARES collaboration is currently operating the largest neutrino
detector in the Northern Hemisphere. One of the goals of ANTARES is the search
for dark matter in the universe. In this paper, the first results on the sear... | astro-ph_CO |
Detecting patchy reionization in the CMB: Upcoming cosmic microwave background (CMB) experiments will measure
temperature fluctuations on small angular scales with unprecedented precision.
Small-scale CMB fluctuations are a mixture of late-time effects: gravitational
lensing, Doppler shifting of CMB photons by moving e... | astro-ph_CO |
Viscosity, pressure, and support of the gas in simulations of merging
cool-core clusters: Major mergers are considered to be a significant source of turbulence in
clusters. We performed a numerical simulation of a major merger event using
nested-grid initial conditions, adaptive mesh refinement, radiative cooling of
... | astro-ph_CO |
Thermal SZ effect in a magnetized IGM dominated by interacting DM
decay/annihilation during dark ages: During cosmic dawn, the thermal history of the universe is well studied, and
a study of this era can give us some of the most useful insight into the
universe before the recombination epoch. Its precise modeling and... | astro-ph_CO |
Athena X-IFU synthetic observations of galaxy clusters to probe the
chemical enrichment of the Universe: Answers to the metal production of the Universe can be found in galaxy
clusters, notably within their Intra-Cluster Medium (ICM). The X-ray Integral
Field Unit (X-IFU) on board the next-generation European X-ray o... | astro-ph_CO |
The ~0.9 mJy sample: A mid-infrared spectroscopic catalog of 150
infrared-luminous, 24 micron selected galaxies at 0.3<z<3.5: We present a catalog of mid-infrared (MIR) spectra of 150 infrared (IR)
luminous galaxies in the Spitzer extragalactic first look survey obtained with
IRS on board Spitzer. The sample is selec... | astro-ph_CO |
Probing general relativistic effects during AGN X-ray eclipses: Long X-ray observations of bright Active Galactic Nuclei show that X-ray
eclipses, with durations from a few hours to a few days, are rather common.
This opens up a new window of opportunity in the search for signatures of
relativistic effects in AGNs: an ... | astro-ph_CO |
The Effects of Calibration on the Bias of Shear Measurements: Forthcoming large-scale surveys will soon attempt to measure cosmic shear to
an unprecedented level of accuracy, requiring a similarly high level of
accuracy in the shear measurements of galaxies. Factors such as pixelisation,
imperfect point-spread function... | astro-ph_CO |
Post-reionization HI 21-cm signal: A probe of negative cosmological
constant: In this study, we investigate a cosmological model involving a negative
cosmological constant (AdS vacua in the dark energy sector). We consider a
quintessence field on top of a negative cosmological constant and study its
impact on cosmolo... | astro-ph_CO |
Lyalpha versus X-ray heating in the high-z IGM: In this paper we examine the effect of X-ray and Lyalpha photons on the
intergalactic medium temperature. We calculate the photon production from a
population of stars and micro-quasars in a set of cosmological hydrodynamic
simulations which self-consistently follow the d... | astro-ph_CO |
Unsupervised Searches for Cosmological Parity-Violation: An
Investigation with Convolutional Neural Networks: Recent measurements of the $4$-point correlation functions (4PCF) from
spectroscopic surveys provide evidence for parity-violations in the large-scale
structure of the Universe. If physical in origin, this co... | astro-ph_CO |
Lower Bounds on Intergalactic Magnetic Fields from Simultaneously
Observed GeV-TeV Light Curves of the Blazar Mrk 501: We derive lower bounds on intergalactic magnetic fields (IGMFs) from upper
limits on the pair echo emission from the blazar Mrk 501, that is, delayed GeV
emission from secondary $e^{-}e^{+}$ pairs pr... | astro-ph_CO |
The Case Against Warm or Self-Interacting Dark Matter as Explanations
for Cores in Low Surface Brightness Galaxies: Warm dark matter (WDM) and self-interacting dark matter (SIDM) are often
motivated by the inferred cores in the dark matter halos of low surface
brightness (LSB) galaxies. We test thermal WDM, non-therm... | astro-ph_CO |
Astrophysical information from the Rayleigh-Jeans Tail of the CMB: One of the explanations for the recent EDGES-LOW band 21-cm measurements of a
strong absorption signal around 80~MHz is the presence of an excess radio
background to the Cosmic Microwave Background (CMB). Such excess can be
produced by the decay of unst... | astro-ph_CO |
Inflation in a closed universe: To derive a power spectrum for energy density inhomogeneities in a closed
universe, we study a spatially-closed inflation-modified hot big bang model
whose evolutionary history is divided into three epochs: an early
slowly-rolling scalar field inflation epoch and the usual radiation and
... | astro-ph_CO |
On the nature of sodium excess objects. I. Data and observed trends: Several studies have reported the presence of sodium excess objects that have
neutral atomic absorption lines at 5895A (NaD) and 8190A that are deeper than
expected based on stellar population models. van Dokkum & Conroy proposed that
low-mass stars a... | astro-ph_CO |
The VLA-COSMOS Perspective on the IR-Radio Relation. I. New Constraints
on Selection Biases and the Non-Evolution of the IR/Radio Properties of Star
Forming and AGN Galaxies at Intermediate and High Redshift: VLA 1.4 GHz (rms noise ~0.012 mJy) and MIPS 24 and 70 micron (rms noise ~0.02
and ~1.7 mJy, respectively) o... | astro-ph_CO |
Conserved Quantities in Lemaitre-Tolman-Bondi Cosmology: We study linear perturbations to a Lema{\^\i}tre-Tolman-Bondi (LTB)
background spacetime. Studying the transformation behaviour of the
perturbations under gauge transformations, we construct gauge invariant
quantities. We show, using the perturbed energy conserva... | astro-ph_CO |
How to Falsify the GR+LambdaCDM Model with Galaxy Redshift Surveys: A wide range of models describing modifications to General Relativity have
been proposed, but no fundamental parameter set exists to describe them.
Similarly, no fundamental theory exists for dark energy to parameterize its
potential deviation from a c... | astro-ph_CO |
Gravitational Waves in Cold Dark Matter: We study the effects of cold dark matter on the propagation of gravitational
waves of astrophysical and primordial origin. We show that the dominant effect
of cold dark matter on gravitational waves from astrophysical sources is a
small frequency dependent modification of the pr... | astro-ph_CO |
The effects of non-linearity on the growth rate constraint from velocity
correlation functions: The two-point statistics of the cosmic velocity field, measured from galaxy
peculiar velocity (PV) surveys, can be used as a dynamical probe to constrain
the growth rate of large-scale structures in the universe. Most work... | astro-ph_CO |
A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to
Damped Lyman-alpha Systems - V. Neutral and Ionised Phase Metallicities: The gas-phase and stellar metallicities have proven to be important
parameters to constrain the star formation history of galaxies. However, HII
regions associated with rece... | astro-ph_CO |
Big Bang Nucleosynthesis with an Inhomogeneous Primordial Magnetic Field
Strength: We investigate the effect on the Big Bang Nucleosynthesis (BBN) from the
presence of a stochastic primordial magnetic field (PMF) whose strength is
spatially inhomogeneous. We assume a uniform total energy density and a
gaussian distri... | astro-ph_CO |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.