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Cosmic slowing down of acceleration for several dark energy
parametrizations: We further investigate slowing down of acceleration of the universe scenario
for five parametrizations of the equation of state of dark energy using four
sets of supernovae data. In a maximal probability analysis we also use the
baryon acou... | astro-ph_CO |
How large is the contribution of cosmic web to $Ω_Λ$ ? A
preliminary study on a novel inhomogenous model: The distribution of matter in the universe shows a complex pattern, formed by
cluster of galaxies, voids and filaments denoted as cosmic web. Different
approaches have been proposed to model such structure in the... | astro-ph_CO |
The Reionization of Carbon: Observations suggest that CII was more abundant than CIV in the intergalactic
medium towards the end of the hydrogen reionization epoch. This transition
provides a unique opportunity to study the enrichment history of intergalactic
gas and the growth of the ionizing background (UVB) at early... | astro-ph_CO |
Needlet thresholding methods in component separation: Foreground components in the Cosmic Microwave Background (CMB) are sparse in
a needlet representation, due to their specific morphological features
(anisotropy, non-Gaussianity). This leads to the possibility of applying
needlet thresholding procedures as a componen... | astro-ph_CO |
Extended Fast Action Minimisation method: application to SDSS-DR12
Combined Sample: We present the first application of the extended Fast Action Minimization
method (eFAM) to a real dataset, the SDSS-DR12 Combined Sample, to reconstruct
galaxies orbits back-in-time, their two-point correlation function (2PCF) in
real... | astro-ph_CO |
Suppressing hot gas accretion to supermassive black holes by stellar
winds: We argue that one of the basic assumptions of the Bondi accretion process,
that the accreting object has zero pressure, might not hold in many galaxies
because of the pressure exerted by stellar winds of star orbiting the central
super massiv... | astro-ph_CO |
Constraining thawing and freezing models with cluster number counts: Measurements of the cluster abundance as a function of mass and redshift
provide an important cosmological test that probe not only the expansion rate
but also the growth of perturbations. In this paper we adopt a scalar field
scenario which admits bo... | astro-ph_CO |
A new stochastic approach to cumulative weak lensing: We study the weak gravitational lensing effects caused by a stochastic
distribution of dark matter halos. We develop a simple approach to calculate
the magnification probability distribution function which allows us to easily
compute the magnitude bias and dispersio... | astro-ph_CO |
Observations favor the redshift-evolutionary $L_X$-$L_{UV}$ relation of
quasars from copula: We compare, with data from the quasars, the Hubble parameter measurements,
and the Pantheon+ type Ia supernova, three different relations between X-ray
luminosity ($L_X$) and ultraviolet luminosity ($L_{UV}$) of quasars. Thes... | astro-ph_CO |
Understanding WIMP-baryon interactions with direct detection: A Roadmap: We study prospects of dark-matter direct-detection searches for probing
non-relativistic effective theory for WIMP-baryon scattering. We simulate a
large set of noisy recoil-energy spectra for different scattering scenarios
(beyond the standard mo... | astro-ph_CO |
Dwarf spheroidals in the M81 Group - Metallicity distribution functions
and population gradients: We study the dwarf spheroidal galaxies in the nearby M81 group in order to
construct their photometric metallicity distributions and to investigate the
potential presence of population gradients. We select all the dwarf ... | astro-ph_CO |
Latest data constraint of some parameterized dark energy models: Using various latest cosmological datasets including Type-Ia supernovae,
cosmic microwave background radiation, baryon acoustic oscillations, and
estimations of the Hubble parameter, we test some dark energy models with
parameterized equations of state an... | astro-ph_CO |
Deep radio observations of the radio halo of the bullet cluster 1E
0657-55.8: We present deep 1.1-3.1 GHz Australia Telescope Compact Array observations of
the radio halo of the bullet cluster, 1E 0657-55.8. In comparison to existing
images of this radio halo the detection in our images is at higher
significance. The... | astro-ph_CO |
Kernel Selection for Gaussian Process in Cosmology: with Approximate
Bayesian Computation Rejection and Nested Sampling: Gaussian Process (GP) has gained much attention in cosmology due to its
ability to reconstruct cosmological data in a model-independent manner. In this
study, we compare two methods for GP kernel s... | astro-ph_CO |
Assessing the viability of successful reconstruction of the dynamics of
dark energy using varying fundamental couplings: We assess the viability of successful reconstruction of the evolution of the
dark energy equation of state using varying fundamental couplings, such as the
fine structure constant or the proton-to-... | astro-ph_CO |
The Doppler effect on indirect detection of dark matter using dark
matter only simulations: Indirect detection of dark matter is a major avenue for discovery. However,
baryonic backgrounds are diverse enough to mimic many possible signatures of
dark matter. In this work, we study the newly proposed technique of dark ... | astro-ph_CO |
Constraints on the End of Reionization from the Density Fields
Surrounding Two Highly Opaque Quasar Sightlines: The observed large-scale scatter in Lyman $\alpha$ opacity of the
intergalactic medium at $z<6$ implies large fluctuations in the neutral
hydrogen fraction that are unexpected long after reionization has en... | astro-ph_CO |
Enhanced curvature perturbations from spherical domain walls nucleated
during inflation: We investigate spherical domain walls~(DWs) nucleated via quantum tunneling
in multifield inflationary models and curvature perturbations induced by the
inhomogeneous distribution of those DWs. We consider the case that the
Eucli... | astro-ph_CO |
The Quijote simulations: The Quijote simulations are a set of 44,100 full N-body simulations spanning
more than 7,000 cosmological models in the $\{\Omega_{\rm m}, \Omega_{\rm b},
h, n_s, \sigma_8, M_\nu, w \}$ hyperplane. At a single redshift the simulations
contain more than 8.5 trillions of particles over a combined... | astro-ph_CO |
Scale-dependent CMB power asymmetry from primordial speed of sound and a
generalized $δ$N formalism: We explore a plausible mechanism that the hemispherical power asymmetry in
the CMB is produced by the spatial variation of the primordial sound speed
parameter. We suggest that in a generalized approach of the $\delta... | astro-ph_CO |
Retrieving the three-dimensional matter power spectrum and galaxy
biasing parameters from lensing tomography: With the availability of galaxy distance indicators in weak lensing surveys,
lensing tomography can be harnessed to constrain the three-dimensional (3D)
matter power spectrum over a range of redshift and phys... | astro-ph_CO |
The integrated angular bispectrum: We study the position-dependent power spectrum and the integrated bispectrum
statistic for 2D cosmological fields on the sphere (integrated angular
bispectrum). First, we derive a useful, $m$-independent, formula for the
full-sky integrated angular bispectrum, based on the constructio... | astro-ph_CO |
A Halo Model of Local IRAS Galaxies Selected at 60 Micron Using
Conditional Luminosity Functions: Using conditional luminosity functions (CLFs) which encode the luminosity
distribution of galaxies as a function of halo mass, we construct a halo model
of IRAS galaxies selected at 60 micron. An abundance matching techn... | astro-ph_CO |
A Full Treatment of Peculiar Velocities on the Reionization Light Cone: Accurate simulations of the 21-cm signal from the Epoch of Reionization
require the generation of maps at specific frequencies given the values of
astrophysical and cosmological parameters. The peculiar velocities of the
hydrogen atoms producing th... | astro-ph_CO |
Magnetic fields in a hot dense neutrino plasma and the Gravitational
Waves: In the present work, we have studied the spectrum of the primordial
gravitational waves due to magnetic instability in the presence of neutrino
asymmetry. The magnetic instability generates a helical magnetic field on a
large scale. The aniso... | astro-ph_CO |
Planck 2015 results. IX. Diffuse component separation: CMB maps: We present foreground-reduced CMB maps derived from the full Planck data set
in both temperature and polarization. Compared to the corresponding Planck 2013
temperature sky maps, the total data volume is larger by a factor of 3.2 for
frequencies between 3... | astro-ph_CO |
Circular Polarization of the CMB: A probe of the First stars: While it is revealed that the Cosmic Microwave Background (CMB) is linearly
polarized at 10 % level, it is predicted that there exists no significant
intrinsic source for circular polarization (CP) in the standard cosmology.
However, during the propagation t... | astro-ph_CO |
Cosmological dependence of the measurements of luminosity function,
projected clustering and galaxy-galaxy lensing signal: Observables such as the luminosity function of galaxies, \Phi(M), the
projected clustering of galaxies, w_p(r_p), and the galaxy-galaxy lensing
signal, \Delta\Sigma, are often measured from galax... | astro-ph_CO |
Rapid onset of the 21-cm signal suggests a preferred mass range for dark
matter particle: We are approaching a new era to probe the 21-cm neutral hydrogen signal from
the period of cosmic dawn. This signal offers a unique window to the virgin
Universe, e.g., to study dark matter models with different small-scale
beha... | astro-ph_CO |
Observational constraints on the unified dark matter and dark energy
model based on the quark bag model: In this work we investigate if a small fraction of quarks and gluons, which
escaped hadronization and survived as a uniformly spread perfect fluid, can
play the role of both dark matter and dark energy. This fluid... | astro-ph_CO |
A candidate tidal disruption event in the Galaxy cluster Abell 3571: Tidal disruption events are possible sources of temporary nuclear activity in
galactic nuclei and can be considered as good indicators of the existence of
super massive black holes in the centers of galaxies. A new X-ray source has
been serendipitousl... | astro-ph_CO |
Reionization of the Intergalactic Medium: After recombination the cosmic gas was left in a cold and neutral state.
However, as the first stars and black holes formed within early galactic
systems, their UV and X-ray radiation induced a gradual phase transition of the
intergalactic gas into the warm and ionized state we... | astro-ph_CO |
Phase-space structure of protohalos: Vlasov versus Particle-Mesh: The phase-space structure of primordial dark matter halos is revisited using
cosmological simulations with three sine waves and Cold Dark Matter (CDM)
initial conditions. The simulations are performed with the tessellation based
Vlasov solver ColDICE and... | astro-ph_CO |
Addressing the Hubble tension in Yukawa cosmology?: In Yukawa cosmology, a recent discovery revealed a relationship between
baryonic matter and the dark sector. The relation is described by the parameter
$\alpha$ and the long-range interaction parameter $\lambda$ - an intrinsic
property of the graviton. Applying the un... | astro-ph_CO |
Probing the evolution of galaxy clusters with the SZ Effect: In galaxy clusters the thermal Sunyaev-Zel'dovich (SZ) effect from the hot
intracluster medium (ICM) provides a direct, self-contained measure of the
pressure integrated over crossing lines of sight, that is intrinsically
independent of redshift and well suit... | astro-ph_CO |
Obtaining non-linear galaxy bias constraints from galaxy-lensing phase
differences: We demonstrate the utility and constraining power of a new statistic for
investigating galaxy bias: the galaxy-lensing phase difference. The statistic
consists in taking the differences of the phases of the harmonic wave-modes
between... | astro-ph_CO |
The QSO HE0450-2958: Scantily dressed or heavily robed? A normal quasar
as part of an unusual ULIRG: (Abridged) The luminous z=0.286 quasar HE0450-2958 is interacting with a
companion galaxy at 6.5 kpc distance and the whole system is a ULIRG. A so far
undetected host galaxy triggered the hypothesis of a mostly "nake... | astro-ph_CO |
X-ray Point Sources and Radio Galaxies in Clusters of Galaxies: Using Chandra imaging spectroscopy and VLA L-band maps, we have identified
radio galaxies at P(1.4 GHz) >= 3x10^{23} W Hz^{-1} and X-ray point sources
(XPSs) at L(0.3-8 keV) >= 10^{42} ergs s^{-1} in 11 moderate redshift
(0.2<z<0.4) clusters of galaxies. E... | astro-ph_CO |
The impact of baryons on the matter power spectrum from the Horizon-AGN
cosmological hydrodynamical simulation: Accurate cosmology from upcoming weak lensing surveys relies on knowledge of
the total matter power spectrum at percent level at scales $k < 10$ $h$/Mpc,
for which modelling the impact of baryonic physics i... | astro-ph_CO |
A simple model linking galaxy and dark matter evolution: We construct a simple phenomenological model for the evolving galaxy
population by incorporating pre-defined baryonic prescriptions into a dark
matter hierarchical merger tree. Specifically the model is based on the simple
gas-regulator model introduced by Lilly ... | astro-ph_CO |
Lensing constraints on ultradense dark matter halos: Cosmological observations precisely measure primordial variations in the
density of the Universe at megaparsec and larger scales, but much smaller
scales remain poorly constrained. However, sufficiently large initial
perturbations at small scales can lead to an abund... | astro-ph_CO |
An updated Gamma Ray Bursts Hubble diagram: Gamma ray bursts (GRBs) have recently attracted much attention as a possible
way to extend the Hubble diagram to very high redshift. To this aim, the
luminosity (or isotropic emitted energy) of a GRB at redshift z must be
evaluated from a correlation with a distance independe... | astro-ph_CO |
Explaining Excess Dipole in NVSS Data Using Superhorizon Perturbation: Many observations in recent times have shown evidence against the standard
assumption of isotropy in the Big Bang model. Introducing a superhorizon scalar
metric perturbation has been able to explain some of these anomalies. In this
work, we probe t... | astro-ph_CO |
Direct detection of galaxy stellar halos : NGC 3957 as a test case: We present a direct detection of the stellar halo of the edge-on S0 galaxy
NGC 3957, using ultra-deep VLT/VIMOS V and R images. This is achieved with a
sky subtraction strategy based on infrared techniques. These observations allow
us to reach unpreced... | astro-ph_CO |
Mass of the universe in a black hole: If spacetime torsion couples to the intrinsic spin of matter according to the
Einstein-Cartan-Sciama-Kibble theory of gravity, then the resulting
gravitational repulsion at supranuclear densities prevents the formation of
singularities in black holes. Consequently, the interior of ... | astro-ph_CO |
C-GOALS: Chandra observations of a complete sample of luminous infrared
galaxies from the IRAS Revised Bright Galaxy Survey: We present X-ray data for a complete sample of 44 luminous infrared galaxies
(LIRGs), obtained with the Chandra X-ray Observatory. These are the X-ray
observations of the high luminosity portio... | astro-ph_CO |
Improving the Estimation of Star formation Rates and Stellar Population
Ages of High-redshift Galaxies from Broadband Photometry: We explore methods to improve the estimates of star formation rates and mean
stellar population ages from broadband photometry of high redshift star-forming
galaxies. We use synthetic spec... | astro-ph_CO |
MOND effects in the inner solar system: I pinpoint a previously unrecognized MOND effect that may act in the inner
solar system, and is due to the galactic acceleration, g_g=eta*a0: a byproduct
of the MOND external-field effect. Predictions of the effect are not generic to
the MOND paradigm, but depend on the particula... | astro-ph_CO |
The Habitable Epoch of the Early Universe: In the redshift range 100<(1+z)<137, the cosmic microwave background (CMB)
had a temperature of 273-373K (0-100 degrees Celsius), allowing early rocky
planets (if any existed) to have liquid water chemistry on their surface and be
habitable, irrespective of their distance from... | astro-ph_CO |
Turbocharging constraints on dark matter substructure through a
synthesis of strong lensing flux ratios and extended lensed arcs: Strong gravitational lensing provides a purely gravitational means to infer
properties of dark matter halos and thereby constrain the particle nature of
dark matter. Strong lenses sometime... | astro-ph_CO |
FAST-PT II: an algorithm to calculate convolution integrals of general
tensor quantities in cosmological perturbation theory: Cosmological perturbation theory is a powerful tool to predict the statistics
of large-scale structure in the weakly non-linear regime, but even at 1-loop
order it results in computationally e... | astro-ph_CO |
Cosmological neutrino entropy changes due to flavor statistical mixing: Entropy changes due to delocalization and decoherence effects should modify
the predictions for the cosmological neutrino background (C$\nu$B) temperature
when one treats neutrino flavors in the framework of composite quantum systems.
Assuming that... | astro-ph_CO |
GRB Probes of the High-z Universe with EXIST: The Energetic X-ray Imaging Survey Telescope (EXIST) mission concept is
optimized for study of high-z GRBs as probes of the early Universe. With a High
Energy Telescope (HET) incorporating a 4.5m^2 5-600keV (CZT; 0.6mm pixels)
detector plane for coded aperture imaging a 90d... | astro-ph_CO |
HSC Year 1 cosmology results with the minimal bias method:
HSC$\times$BOSS galaxy-galaxy weak lensing and BOSS galaxy clustering: We present cosmological parameter constraints from a blinded joint analysis
of galaxy-galaxy weak lensing, $\Delta\!\Sigma(R)$, and projected correlation
function, $w_\mathrm{p}(R)$, measu... | astro-ph_CO |
Phenomenology of fermion production during axion inflation: We study the production of fermions through a derivative coupling with a
pseudoscalar inflaton and the effects of the produced fermions on the scalar
primordial perturbations. We present analytic results for the modification of
the scalar power spectrum due to... | astro-ph_CO |
Snowmass2021 CMB-HD White Paper: CMB-HD is a proposed millimeter-wave survey over half the sky that would be
ultra-deep (0.5 uK-arcmin) and have unprecedented resolution (15 arcseconds at
150 GHz). Such a survey would answer many outstanding questions about the
fundamental physics of the Universe. Major advances would ... | astro-ph_CO |
Primordial magnetic fields in the $f^{2}FF$ model in large field
inflation under de Sitter and power law expansion: We use the $f^{2}FF$ model to study the generation of primordial magnetic
fields (PMF) in the context of large field inflation (LFI), described by the
potential, $V \sim M \phi^{p}$. We compute the magn... | astro-ph_CO |
Revealing modified gravity signal in matter and halo hierarchical
clustering: We use a set of N-body simulations employing a modified gravity (MG) model
with Vainshtein screening to study matter and halo hierarchical clustering. As
test-case scenarios we consider two normal branch Dvali-Gabadadze-Porrati
(nDGP) gravi... | astro-ph_CO |
New insight on galaxy structure from GALPHAT I. Motivation, methodology,
and benchmarks for Sersic models: We introduce a new galaxy image decomposition tool, GALPHAT (GALaxy
PHotometric ATtributes), to provide full posterior probability distributions
and reliable confidence intervals for all model parameters. GALPHA... | astro-ph_CO |
Probing Physics Beyond the Standard Model: Limits from BBN and the CMB
Independently and Combined: We present new Big Bang Nucleosynthesis (BBN) limits on the cosmic expansion
rate or relativistic energy density, quantified via the number $N_\nu$ of
equivalent neutrino species. We use the latest light element observa... | astro-ph_CO |
Discovering a new well: Decaying dark matter with profile likelihoods: A large number of studies, all using Bayesian parameter inference from Markov
Chain Monte Carlo methods, have constrained the presence of a decaying dark
matter component. All such studies find a strong preference for either very
long-lived or very ... | astro-ph_CO |
relensing: Reconstructing the mass profile of galaxy clusters from
gravitational lensing: In this work we present relensing, a package written in python whose goal is
to model galaxy clusters from gravitational lensing. With relensing we extend
the amount of software available, which provides the scientific community... | astro-ph_CO |
Lensed Type Ia Supernovae as Probes of Cluster Mass Models: Using three magnified Type Ia supernovae (SNe Ia) detected behind CLASH
clusters, we perform a first pilot study to see whether standardizable candles
can be used to calibrate cluster mass maps created from strong lensing
observations. Such calibrations will b... | astro-ph_CO |
An ALMA survey of Sub-millimetre Galaxies in the Extended Chandra Deep
Field South: Detection of [C II] at z=4.4: We present ALMA 870-um (345GHz) observations of two sub-millimetre galaxies
(SMGs) drawn from an ALMA study of the 126 sub-millimeter sources from the
LABOCA Extended Chandra Deep Field South Survey (LESS... | astro-ph_CO |
A Very Large ($θ_{E}\gtrsim40$") Strong Gravitational Lens Selected
with the Sunyaev-Zel'dovich Effect: PLCK G287.0+32.9 ($z$ = 0.38): Since galaxy clusters sit at the high-end of the mass function, the number of
galaxy clusters both massive and concentrated enough to yield particularly
large Einstein radii poses use... | astro-ph_CO |
Cosmic Filaments from Cosmic Strings: Cosmic strings are generically predicted in many extensions of the Standard
Model of particle physics. We propose a new avenue for detecting cosmic strings
through their effect on the filamentary structure in the cosmic web. Using
cosmological simulations of the density wake from a... | astro-ph_CO |
LoCuSS: The Mass Density Profile of Massive Galaxy Clusters at z=0.2: We present a stacked weak-lensing analysis of an approximately mass-selected
sample of 50 galaxy clusters at 0.15<z<0.3, based on observations with
Suprime-Cam on the Subaru Telescope. We develop a new method for selecting
lensed background galaxies ... | astro-ph_CO |
$Λ_{\rm s}$CDM cosmology from a type-II minimally modified gravity: We have successfully integrated $\Lambda_{\rm s}$CDM, a promising model for
alleviating cosmological tensions, into a theoretical framework by endowing it
with a specific Lagrangian from the VCDM model, a type-II minimally modified
gravity. In this the... | astro-ph_CO |
Mg II Absorption Characteristics of a Volume-Limited Sample of Galaxies
at z ~ 0.1: We present an initial survey of Mg II absorption characteristics in the halos
of a carefully constructed, volume-limited subsample of galaxies embedded in
the spectroscopic part of the Sloan Digital Sky Survey. We observed quasars
nea... | astro-ph_CO |
Convergence properties of fine structure constant measurements using
quasar absorption systems: Searches for spacetime variations of fundamental constants have entered an
era of unprecedented precision. New, high quality quasar spectra require
increasingly refined analytic methods. In this article, a continuation in ... | astro-ph_CO |
Rastall gravity extension of the standard $Λ$CDM model:
theoretical features and observational constraints: We present a detailed investigation of the Rastall gravity extension of the
standard $\Lambda$CDM model. We review the model for two simultaneous
modifications of different nature in the Friedmann equation due ... | astro-ph_CO |
Improving Dark Energy Constraints with High Redshift Type Ia Supernovae
from CANDELS and CLASH: Aims. We investigate the degree of improvement in dark energy constraints
that can be achieved by extending Type Ia Supernova (SN Ia) samples to
redshifts z > 1.5 with the Hubble Space Telescope (HST), particularly in the
... | astro-ph_CO |
Tomography-based observational measurements of the halo mass function
via the submillimeter magnification bias: Aims. The main goal of this paper is to derive observational constraints on
the halo mass fuction (HMF) by performing a tomographic analysis of the
magnification bias signal on a sample of background submil... | astro-ph_CO |
Constraints on active and sterile neutrinos in an interacting dark
energy cosmology: We investigate the impacts of dark energy on constraining massive
(active/sterile) neutrinos in interacting dark energy (IDE) models by using the
current observations. We employ two typical IDE models, the interacting $w$
cold dark m... | astro-ph_CO |
The impact of sloshing on the intra-group medium and old radio lobe of
NGC 5044: We present temperature and abundance maps of the central 125 kpc of the NGC
5044 galaxy group, based an a deep XMM-Newton observation. The abundance map
reveals an asymmetrical abundance structure, with the centroid of the highest
abunda... | astro-ph_CO |
Precision cosmology with a combination of wide and deep
Sunyaev-Zeldovich cluster surveys: We show the advantages of a wedding cake design for Sunyaev-Zel'dovich
cluster surveys. We show that by dividing up a cluster survey into a wide and a
deep survey, one can essentially recover the cosmological information that
w... | astro-ph_CO |
Multipole vectors of completely random microwave skies for $l \leq 50$: The statistical cosmological principle states that observables on the
celestial sphere are sampled from a rotationally invariant distribution.
Previously certain large scale anomalies which violate this principle have been
found, for example an ali... | astro-ph_CO |
Active and Sterile Neutrino Emission and SN1987A Pulsar Velocity: Recently estimates have been made of the velocities of pulsars produced by
the emission of sterile neutrinos during the first 10 seconds and by active
neutrinos during the second 10 seconds after a supernova event reaches thermal
equilibrium. Neutrinos p... | astro-ph_CO |
Ionized nitrogen at high redshift: We present secure [NII[ detections in two mm-bright, strongly lensed objects
at high redshift, APM08279+5255 (z=3.911) and MM18423+5938 (z=3.930), using the
IRAM Plateau de Bure Interferometer. Due to its ionization energy [NII] is a
good tracer of the ionized gas phase in the interst... | astro-ph_CO |
Making Galaxies in a Cosmological Context: The Need for Early Stellar
Feedback: We introduce the Making Galaxies in a Cosmological Context (MaGICC) program
of smoothed particle hydrodynamics (SPH) simulations. We describe a parameter
study of galaxy formation simulations of an L* galaxy that uses early stellar
feedba... | astro-ph_CO |
SkyMapper Southern Survey: Data Release 4: We present the fourth data release (DR4) of the SkyMapper Southern Survey
(SMSS), the last major step in our hemispheric survey with six optical filters:
u, v, g, r, i, z. SMSS DR4 covers 26,000 sq.deg from over 400,000 images
acquired by the 1.3m SkyMapper telescope between 2... | astro-ph_CO |
Asymptotic Giant Branch Stars in the Sculptor Dwarf Spheroidal Galaxy: JHK_S photometry is presented for a 35 arcmin square field centred on the
Sculptor dwarf spheroidal galaxy. With the aid of published kinematic data
definite galaxy members are identified and the width in J-K of the
colour-magnitude diagram is shown... | astro-ph_CO |
Optical Spectra of SNR Candidates in NGC 300: We present moderate-resolution (<5A) long-slit optical spectra of 51 nebular
objects in the nearby Sculptor Group galaxy NGC 300 obtained with the 2.3 meter
Advanced Technology Telescope at Siding Spring Observatory, Australia. Adopting
the criterion of [SII]/Ha>=0.4 to con... | astro-ph_CO |
N-body simulation of the Stephan's Quintet: The evolution of compact groups of galaxies may represent one of the few
places in the nearby universe in which massive galaxies are being forged
through a complex set of processes involving tidal interaction, ram-pressure
stripping, and perhaps finally "dry-mergers" of galax... | astro-ph_CO |
Radiation and energy release in a background field of axion-like dark
matter: We find that a fuzzy dark matter background and the mG scale magnetic field
in the galactic center can give rise to a radiation with a very large energy
release. The frequency of the radiation field is the same as the frequency of
the oscil... | astro-ph_CO |
Fast shimming algorithm based on Bayesian optimization for magnetic
resonance based dark matter search: The sensitivity and accessible mass range of magnetic resonance searches for
axionlike dark matter depends on the homogeneity of applied magnetic fields.
Optimizing homogeneity through shimming requires exploring a... | astro-ph_CO |
Moving mesh cosmology: tracing cosmological gas accretion: We investigate the nature of gas accretion onto haloes and galaxies at z=2
using cosmological hydrodynamic simulations run with the moving mesh code
AREPO. Implementing a Monte Carlo tracer particle scheme to determine the
origin and thermodynamic history of ac... | astro-ph_CO |
On the Correlations between Galaxy Properties and Supermassive Black
Hole Mass: We use a large sample of upper limits and accurate estimates of supermassive
black holes masses coupled with libraries of host galaxy velocity dispersions,
rotational velocities and photometric parameters extracted from Sloan Digital
Sky ... | astro-ph_CO |
$f(R)$ gravity modifications: from the action to the data: It is a very well established matter nowadays that many modified gravity
models can offer a sound alternative to General Relativity for the description
of the accelerated expansion of the universe. But it is also equally well known
that no clear and sharp discr... | astro-ph_CO |
Gravitational Waves Notes, Issue #3 : "Stellar cusps in galactic nuclei
- How stars distribute around a massive black hole": GW Notes was born from the need for a journal where the distinct communities
involved in gravitation wave research might gather. While these three
communities - Astrophysics, General Relativity... | astro-ph_CO |
Solar-system tests of the inflation model with a Weyl term: Recently, there has been an interest in inflation and modified gravity with a
Weyl term added to the general-relativistic action (N. Derulle, M. Sasaki, Y.
Sendouda and A. Youssef, JCAP, 3, 040 (2011)). In this paper we study empirical
constraint on this modif... | astro-ph_CO |
Understanding the neutrino mass constraints achievable by combining CMB
lensing and spectroscopic galaxy surveys: We perform a thorough examination of the neutrino mass ($M_\nu$) constraints
achievable by combining future spectroscopic galaxy surveys with cosmic
microwave background (CMB) experiments, focusing on the... | astro-ph_CO |
Probing cluster formation under extreme conditions: massive star
clusters in blue compact galaxies: The numerous and massive young star clusters in blue compact galaxies (BCGs)
are used to investigate the properties of their hosts. We test whether BCGs
follow claimed relations between cluster populations and their ho... | astro-ph_CO |
Constraining dark sector perturbations II: ISW and CMB lensing
tomography: Any Dark Energy (DE) or Modified Gravity (MG) model that deviates from a
cosmological constant requires a consistent treatment of its perturbations,
which can be described in terms of an effective entropy perturbation and an
anisotropic stress... | astro-ph_CO |
First results from the IllustrisTNG simulations: radio haloes and
magnetic fields: We introduce the IllustrisTNG project, a new suite of cosmological
magnetohydrodynamical simulations performed with the moving-mesh code AREPO
employing an updated Illustris galaxy formation model. Here we focus on the
general properti... | astro-ph_CO |
Submillimetre Cosmology at High Angular Resolution: Over the last decade observations at submillimetre (submm) and millimetre
(mm) wavelengths, with their unique ability to trace molecular gas and dust,
have attained a central role in our exploration of galaxies at all redshifts.
Due to the limited sensitivities and an... | astro-ph_CO |
An interacting model for the cosmological dark sector: We discuss a new interacting model for the cosmological dark sector in which
the attenuated dilution of cold dark matter scales as $a^{-3}f(a)$, where f(a)
is an arbitrary function of the cosmic scale factor $a$. From thermodynamic
arguments, we show that f(a) is p... | astro-ph_CO |
Influence of early dark matter halos on the primordial black holes
merger rate: Primordial black hole (PBH) binaries forming in the early Universe may
contribute to the merger events observed by the LIGO-Virgo-KAGRA
collaborations. Moreover, the inferred merger rate constraints the fraction of
PBH with masses $m \sim... | astro-ph_CO |
Constraints on the velocity of gravitational waves from NANOGrav 15-year
data set: General relativity predicts that gravitational waves propagate at the speed
of light. Although ground-based gravitational-wave detectors have successfully
constrained the velocity of gravitational waves in the high-frequency range,
ext... | astro-ph_CO |
Planck Early Results XXVI: Detection with Planck and confirmation by
XMM-Newton of PLCK G266.6-27.3, an exceptionally X-ray luminous and massive
galaxy cluster at z~1: We present first results on PLCK G266.6-27.3, a galaxy cluster candidate
detected at a signal-to-noise ratio of 5 in the Planck All Sky survey. An
X... | astro-ph_CO |
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