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Interferences in the Stochastic Gravitational Wave Background: Although the expansion of the Universe explicitly breaks the time-translation
symmetry, cosmological predictions for the stochastic gravitational wave
background (SGWB) are usually derived under the so-called stationary
hypothesis. By dropping this assumpti... | astro-ph_CO |
Diffuse Radio Emission in Abell 754: We present a low frequency study of the diffuse radio emission in the galaxy
cluster A754. We present new 150 MHz image of the galaxy cluster A754 made with
the Giant Metrewave Radio Telescope (GMRT) and discuss the detection of 4
diffuse features. We compare the 150 MHz image with ... | astro-ph_CO |
The slope of the Baryonic Tully-Fisher relation: We present the results of a baryonic Tully-Fisher relation (BTFR) study for a
local sample of relatively isolated disk galaxies. We derive a BTFR with a
slope near 3 measured over about 4 dex in baryon mass for our combined
\textrm{H\,\scriptsize{I}} and bright spiral di... | astro-ph_CO |
The CMB Dipole: Eppur Si Muove: The largest temperature anisotropy in the cosmic microwave background (CMB)
is the dipole. The simplest interpretation of the dipole is that it is due to
our motion with respect to the rest frame of the CMB. As well as creating the
$\ell$=1 mode of the CMB sky, this motion affects all as... | astro-ph_CO |
Large non-Gaussian Halo Bias from Single Field Inflation: We calculate Large Scale Structure observables for non-Gaussianity arising
from non-Bunch-Davies initial states in single field inflation. These scenarios
can have substantial primordial non-Gaussianity from squeezed (but observable)
momentum configurations. The... | astro-ph_CO |
Improving lensing cluster mass estimate with flexion: Gravitational lensing has long been considered as a valuable tool to
determine the total mass of galaxy clusters. The shear profile as inferred from
the statistics of ellipticity of background galaxies allows to probe the
cluster intermediate and outer regions thus ... | astro-ph_CO |
Possible Alternate Scenario for short Duration GRBs: In this paper we look at new class of objects made up entirely of dark matter
particles. We look at these objects as possible candidate for short duration
gamma ray bursts eliminating the baryon load problem. These could also provide
a possible scenario for the forma... | astro-ph_CO |
Constraints on Primordial Magnetic Fields from Planck combined with the
South Pole Telescope CMB B-mode polarization measurements: A primordial magnetic field (PMF) present before recombination can leave
specific signatures on the cosmic microwave background (CMB) fluctuations. Of
particular importance is its contrib... | astro-ph_CO |
Testing consistency of general relativity with kinematic and dynamical
probes: In this work, we test consistency relations between a kinematic probe, the
observational Hubble data, and a dynamical probe, the growth rates for cosmic
large scale structure, which should hold if general relativity is the correct
theory o... | astro-ph_CO |
Testing General Relativity using the Environmental Dependence of Dark
Matter Halos: In this Letter, we investigate the environmental dependence of dark matter
halos in theories that attempt to explain the accelerated expansion of the
Universe by modifying general relativity (GR). Using high-resolution N-body
simulati... | astro-ph_CO |
The Formation of the Local Group Planes of Galaxies: The confinement of most satellite galaxies in the Local Group to thin planes
presents a challenge to the theory of hierarchical galaxy clustering. The
PAndAS collaboration has identified a particularly thin configuration with
kinematic coherence among companions of M... | astro-ph_CO |
Taxonomy of Dark Energy Models: The accelerated expansion of the Universe is one of the main discoveries of
the past decades, indicating the presence of an unknown component: the dark
energy. Evidence of its presence is being gathered by a succession of
observational experiments with increasing precision in its measure... | astro-ph_CO |
Reconstructing the Initial Density Field of the Local Universe: Method
and Test with Mock Catalogs: Our research objective in this paper is to reconstruct an initial linear
density field, which follows the multivariate Gaussian distribution with
variances given by the linear power spectrum of the current CDM model an... | astro-ph_CO |
Anisotropic Galactic Outflows and Enrichment of the Intergalactic
Medium. II. Numerical Simulations: We combine an analytic model for anisotropic outflows and galaxy formation
with numerical simulations of large-scale structure and halo formation to study
the impact of galactic outflows on the evolution of the IGM. W... | astro-ph_CO |
Gravitational energy as dark energy: Average observational quantities: In the timescape scenario cosmic acceleration is understand as an apparent
effect, due to gravitational energy gradients that grow when spatial curvature
gradients become significant with the nonlinear growth of cosmic structure.
This affects the ca... | astro-ph_CO |
Production of EMRIs in Supermassive Black Hole Binaries: We consider the formation of extreme mass-ratio inspirals (EMRIs) sourced
from a stellar cusp centred on a primary supermassive black hole (SMBH) and
perturbed by an inspiraling less massive secondary SMBH. The problem is
approached numerically, assuming the star... | astro-ph_CO |
The SLUGGS Survey: Globular cluster system kinematics and substructure
in NGC 4365: We present a kinematic analysis of the globular cluster (GC) system of the
giant elliptical galaxy NGC 4365 and find several distinct kinematic
substructures. This analysis is carried out using radial velocities for 269
GCs, obtained ... | astro-ph_CO |
A new probe of the small-scale primordial power spectrum: astrometric
microlensing by ultracompact minihalos: The dark matter enclosed in a density perturbation with a large initial
amplitude (delta-rho/rho > 1e-3) collapses shortly after recombination and
forms an ultracompact minihalo (UCMH). Their high central den... | astro-ph_CO |
Discovery of a supercluster in the ZOA in Vela: We report the discovery of a potentially major supercluster that extends
across the Galactic Plane in the constellation of Vela, at a mean recessional
velocity of ~18,000 km/s. Recent multi-object spectroscopic observations of
this Vela Supercluster (VSCL), using AAOmega+... | astro-ph_CO |
Modified Starobinsky Inflation: Starobinsky has suggested an inflation model which is obtained from the
vacuum Einstein's equations modified by the one-loop corrections due to
quantized matter fields. Although the one-loop gravitational action is not
known for a general FRW background, it can be obtained in a de Sitter... | astro-ph_CO |
The eROSITA Final Equatorial-Depth Survey (eFEDS): LOFAR view of
brightest cluster galaxies and AGN feedback: During the performance verification phase of the SRG/eROSITA telescope, the
eROSITA Final Equatorial-Depth Survey (eFEDS) has been carried out. It covers a
140 deg$^2$ field located at 126$^\circ <$ R.A. $< 1... | astro-ph_CO |
Exploring suppressed long-distance correlations as the cause of
suppressed large-angle correlations: The absence of large-angle correlations in the map of cosmic microwave
background temperature fluctuations is among the well-established anomalies
identified in full-sky and cut-sky maps over the past three decades. S... | astro-ph_CO |
Reconstructing the interaction between dark energy and dark matter using
Gaussian Processes: We present a nonparametric approach to reconstruct the interaction between
dark energy and dark matter directly from SNIa Union 2.1 data using Gaussian
processes, which is a fully Bayesian approach for smoothing data. In this... | astro-ph_CO |
Reconstructing the baryon acoustic oscillations using biased tracers: The reconstruction of the initial conditions of the Universe is an important
topic in cosmology, particularly in the context of sharpening the measurement
of the baryon acoustic oscillation (BAO) peak. Nonlinear reconstruction
algorithms developed in... | astro-ph_CO |
Symmetry of the CMB sky as a new test of its statistical isotropy. Non
Cosmological Octupole?: In this article we propose a novel test for statistical anisotropy of the
CMB. The test is based on the fact, that the Galactic foregrounds have a
remarcably strong symmetry with respect to their antipodal points and with
r... | astro-ph_CO |
Discriminating power of milli-lensing observations for dark matter
models: The nature of dark matter (DM) is still under intense debate. Sub-galactic
scales are particularly critical, as different, currently viable DM models make
diverse predictions on the expected abundance and density profile of DM haloes
on these ... | astro-ph_CO |
Steep Faint-end Slopes of Galaxy Mass and Luminosity Functions at z>=6
and the Implications for Reionisation: We present the results of a numerical study comparing photometric and
physical properties of simulated z=6-9 galaxies to the observations taken by
the WFC3 instrument aboard the Hubble Space Telescope. Using ... | astro-ph_CO |
Herschel-ATLAS: far-infrared properties of radio-selected galaxies: We use the Herschel-ATLAS science demonstration data to investigate the
star-formation properties of radio-selected galaxies in the GAMA-9h field as a
function of radio luminosity and redshift. Radio selection at the lowest radio
luminosities, as expec... | astro-ph_CO |
Beyond the Boost: Measuring the intrinsic dipole of the CMB using the
spectral distortions of the monopole and quadrupole: We present a general framework for accurate spectral modeling of the low
multipoles of the cosmic microwave background (CMB) as observed in a boosted
frame. In particular, we demonstrate how spec... | astro-ph_CO |
Using Cumulative Number Densities to Compare Galaxies across Cosmic Time: Comparing galaxies across redshifts at fixed cumulative number density is a
popular way to estimate the evolution of specific galaxy populations. This
method ignores scatter in mass accretion histories and galaxy-galaxy mergers,
which can lead to... | astro-ph_CO |
Constraints on primordial magnetic fields from the optical depth of the
cosmic microwave background: Damping of magnetic fields via ambipolar diffusion and decay of
magnetohydrodynamical (MHD) turbulence in the post decoupling era heats the
intergalactic medium (IGM). Delayed recombination of hydrogen atoms in the IG... | astro-ph_CO |
The cosmic shallows I: interaction of CMB photons in extended galaxy
halos: We report and analyse the presence of foregrounds in the cosmic microwave
background (CMB) radiation associated to extended galactic halos. Using the
cross correlation of Planck and WMAP maps and the 2MRS galaxy catalogue, we
find that the me... | astro-ph_CO |
The observed galaxy bispectrum from single-field inflation in the
squeezed limit: Using the consistency relation in Fourier space, we derive the observed
galaxy bispectrum from single-field inflation in the squeezed limit, in which
one of the three modes has a wavelength much longer than the other two. This
provides ... | astro-ph_CO |
The environment and redshift dependence of accretion onto dark matter
halos and subhalos: A dark-matter-only Horizon Project simulation is used to investigate the
environment- and redshift- dependence of accretion onto both halos and
subhalos. These objects grow in the simulation via mergers and via accretion of
diff... | astro-ph_CO |
Performance of Non-Parametric Reconstruction Techniques in the Late-Time
Universe: In the context of a Hubble tension problem that is growing in its statistical
significance, we reconsider the effectiveness of non-parametric reconstruction
techniques which are independent of prescriptive cosmological models. By takin... | astro-ph_CO |
Extracting the Global 21-cm signal from Cosmic Dawn and Epoch of
Reionization in the presence of Foreground and Ionosphere: Detection of redshifted \ion{H}{i} 21-cm emission is a potential probe for
investigating the Universe's first billion years. However, given the
significantly brighter foreground, detecting 21-cm... | astro-ph_CO |
ALMA Observations of SPT-Discovered, Strongly Lensed, Dusty,
Star-Forming Galaxies: We present Atacama Large Millimeter/submillimeter Array (ALMA) 860 micrometer
imaging of four high-redshift (z=2.8-5.7) dusty sources that were detected
using the South Pole Telescope (SPT) at 1.4 mm and are not seen in existing
radio... | astro-ph_CO |
Primordial Non-Gaussianity in the Cosmic Microwave Background: In the last few decades, advances in observational cosmology have given us a
standard model of cosmology. We know the content of the universe to within a
few percent. With more ambitious experiments on the way, we hope to move beyond
the knowledge of what t... | astro-ph_CO |
Loop contributions to the scalar power spectrum due to quartic order
action in ultra slow roll inflation: [Abridged] In contemporary literature, the calculation of modifications to
the inflationary scalar power spectrum due to the loops from the higher order
interaction terms in the Hamiltonian have led to a discussi... | 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 |
Cosmological backreaction: This work summarises some of the attempts to explain the phenomenon of dark
energy as an effective description of complex gravitational physics and the
proper interpretation of observations. Cosmological backreaction has been shown
to be relevant for observational (precision) cosmology, never... | astro-ph_CO |
Unleashing Positive Feedback: Linking the Rates of Star Formation,
Supermassive Black Hole Accretion and Outflows in Distant Galaxies: Pressure-regulated star formation is a simple variant on the usual
supernova-regulated star formation efficiency that controls the global star
formation rate as a function of cold gas... | astro-ph_CO |
Flaring Patterns in Blazars: Blazars radiate from relativistic jets launched by a supermassive black hole
along our line of sight; the subclass of FSRQs exhibits broad emission lines, a
telltale sign of a gas-rich environment and high accretion rate, contrary to
the other subclass of the BL Lacertae objects. We show th... | astro-ph_CO |
The origin of the WMAP quadrupole: The cosmic microwave background (CMB) temperature maps from the Wilkinson
Microwave Anisotropy Probe (WMAP) are of great importance for cosmology. In
previous work we had developed a pipeline for map-making independently of the
WMAP team. The new maps produced from the WMAP raw data b... | astro-ph_CO |
Density Perturbation Growth in Teleparallel Cosmology: We study the cosmological perturbations in teleparallel dark energy models in
which there is a dynamical scalar field with a non-minimal coupling to gravity.
We find that the propagating degrees of freedom are the same as in quintessence
cosmology despite that vari... | astro-ph_CO |
Testing the Alignment Tendency of Some Polarized Radio Sources: Measuring the alignment of polarized radio sources requires comparing vectors
at different locations on the sky, i.e. on a sphere. A test of alignment is
derived herein. While both large scale and coordinate independent, the test
avoids the mathematical su... | astro-ph_CO |
Non-Gaussianity of diffuse Galactic synchrotron emission at 408 MHz: Diffuse Galactic emission at low frequencies is a major contaminant for
studies of redshifted $21$ cm line studies. Removal of these foregrounds is
essential for exploiting the signal from neutral hydrogen at high redshifts.
Analysis of foregrounds an... | astro-ph_CO |
Spherical collapse model with non-clustering dark energy: We investigate a spherical overdensity model for the non-clustering dark
energy (DE) with the constant equation of state, w in a flat universe. In this
case, the exact solution for the evolution of the scale factor is obtained for
general w. We also obtain the e... | astro-ph_CO |
The Size, Shape and Orientation of Cosmological Voids in the Sloan
Digital Sky Survey: We present a detailed description of our void finding algorithm which is an
extension of the prescription by Hoyle and Vogeley (2002). We include a
discussion of the reproducibility and robustness of the algorithm as well as
the st... | astro-ph_CO |
The Origin of Dust in Early-Type Galaxies and Implications for Accretion
onto Supermassive Black Holes: We have conducted an archival Spitzer study of 38 early-type galaxies (ETGs)
in order to determine the origin of the dust in approximately half of this
population. Our sample galaxies generally have good wavelength... | astro-ph_CO |
Accounting for selection effects in the BH-bulge relations: No evidence
for cosmological evolution: The redshift evolution of the black hole - bulge relations is an essential
observational constraint for models of black hole - galaxy coevolution. In
addition to the observational challenges for these studies, conclusi... | astro-ph_CO |
Enhancing Bispectrum Estimators for Galaxy Redshift Surveys with
Velocities: We forecast the ability of bispectrum estimators to constrain primordial
non-Gaussianity using future photometric galaxy redshift surveys. A full-sky
survey with photometric redshift resolution of $\sigma_z/(1+z)=0.05$ in the
redshift range ... | astro-ph_CO |
Dark matter decay in the Milky Way halo: Dark matter may be detected in X-ray decay, including from the decay of the
dark matter particles that make up the Milky Way (MW) halo. We use a range of
density profiles to compute X-ray line intensity profiles, with a focus on the
resonantly produced sterile neutrino dark matt... | astro-ph_CO |
Constraints on primordial black holes with CMB spectral distortions: In the mixed dark matter scenarios consisting of primordial black holes
(PBHs) and weakly interacting massive particles (WIMPs), WIMPs can be accreted
onto PBHs to form ultracompact minihalos (UCMHs) with a density spike in the
early universe. Compare... | astro-ph_CO |
New polarimetric constraints on axion-like particles: We show that the parameter space of axion-like particles can be severly
constrained using high-precision measurements of quasar polarisations. Robust
limits are derived from the measured bounds on optical circular polarisation
and from the distribution of linear pol... | astro-ph_CO |
Are "Changing-Look'' Active Galactic Nuclei Special in the Coevolution
of Supermassive Black Holes and their Hosts? I: The nature of the so-called ``changing-look'' (CL) active galactic nucleus
(AGN), which is characterized by spectral-type transitions within $\sim10$~yr,
remains an open question. As the first in our... | astro-ph_CO |
Spectrum of the Anomalous Microwave Emission in the North Celestial Pole
with WMAP 7-Year data: We estimate the frequency spectrum of the diffuse anomalous microwave
emission (AME) on the North Celestial Pole (NCP) region of the sky with the
Correlated Component Analysis (CCA) component separation method applied to W... | astro-ph_CO |
The modified gravity lightcone simulation project I: Statistics of
matter and halo distributions: We introduce a set of four very high resolution cosmological simulations for
exploring $f(R)$-gravity, with $2048^3$ particles in $768\,h^{-1}\textrm{Mpc}$
and $1536\,h^{-1}\textrm{Mpc}$ simulation boxes, both for a
$|\o... | astro-ph_CO |
Simultaneous modelling of matter power spectrum and bispectrum in the
presence of baryons: We demonstrate that baryonification algorithms, which displace particles in
gravity-only simulations according to physically-motivated prescriptions, can
simultaneously capture the impact of baryonic physics on the 2 and 3-poin... | astro-ph_CO |
The role of quasars in galaxy formation: We discuss evidence that quasars, and more generally radio jets, may have
played an active role in the formation stage of galaxies by inducing star
formation, i.e. through positive feedback. This mechanism first proposed in the
70's has been considered as anecdotic until now, co... | astro-ph_CO |
A Hydrodynamical Approach to CMB mu-distortions: Spectral distortion of the cosmic microwave background provides a unique
opportunity to probe primordial perturbations on very small scales by
performing large-scale measurements. We discuss in a systematic and pedagogic
way all the relevant physical phenomena involved i... | astro-ph_CO |
Extending the Coyote emulator to dark energy models with standard
$w_0$-$w_a$ parametrization of the equation of state: We discuss an extension of the Coyote emulator to predict non-linear matter
power spectra of dark energy (DE) models with a scale factor dependent equation
of state of the form w = w_0 + ( 1 - a )w_... | astro-ph_CO |
Corrective effect of many-body interactions in dynamical friction: Dynamical friction is a fundamental and important phenomenon in astrophysics.
The Chandrasekhar formula is a well-known analytical estimation of the effect.
However, current astrophysicists have realized that the formula is not correct
in some cases bec... | astro-ph_CO |
Non-linear Matter Spectra in Coupled Quintessence: We consider cosmologies in which a dark-energy scalar field interacts with
cold dark matter. The growth of perturbations is followed beyond the linear
level by means of the time-renormalization-group method, which is extended to
describe a multi-component matter sector... | astro-ph_CO |
The H0 trouble: Confronting Non-thermal Dark Matter and Phantom
Cosmology with the CMB, BAO, and Type Ia Supernovae data: We have witnessed different values of the Hubble constant being found in the
literature in the past years. Albeit, early measurements often result in an
$H_0$ much smaller than those from late-tim... | astro-ph_CO |
Nonstandard cosmology: Considering radial geodesics in the Robertson-Walker metric leads us to
abandon the co-moving coordinates. Instead we work in the cosmic rest frame.
Since then the matter is in motion, the solution of Einstein's equations is
more complicated. We calculate the first correction to standard cosmolog... | astro-ph_CO |
An ALMA survey of submillimetre galaxies in the Extended Chandra Deep
Field South: High resolution 870um source counts: We report the first counts of faint submillimetre galaxies (SMG) in the
870-um band derived from arcsecond resolution observations with the Atacama
Large Millimeter Array (ALMA). We have used ALMA t... | astro-ph_CO |
Dynamic of the accelerated expansion of the universe in the DGP model: According to experimental data of SNe Ia (Supernovae type Ia), we will
discuss in detial dynamics of the DGP model and introduce a simple
parametrization of matter $\omega$, in order to analyze scenarios of the
expanding universe and the evolution o... | astro-ph_CO |
Numerical evaluation of inflationary 3-point functions on curved field
space: We extend the public CppTransport code to calculate the statistical
properties of fluctuations in multiple-field inflationary models with curved
field space. Our implementation accounts for all physical effects at tree-level
in the 'in-in' ... | astro-ph_CO |
Exploratory X-ray Monitoring of Luminous Radio-Quiet Quasars at High
Redshift: Initial Results: We present initial results from an exploratory X-ray monitoring project of
two groups of comparably luminous radio-quiet quasars (RQQs). The first
consists of four sources at 4.10 <= z <= 4.35, monitored by Chandra, and th... | astro-ph_CO |
Primordial magnetic field generation via primordial black hole disks: Large scale primordial magnetic fields (PMFs) threading the intergalactic
medium are observed ubiquitously in the Universe playing a key role in the
cosmic evolution. Their origin is still debated constituting a very active
field of research. In the ... | astro-ph_CO |
Apparent Superluminality of Lensed Gravitational Waves: We consider gravitational wave (GW) sources with an associated
electromagnetic (EM) counterpart, and analyze the time delay between both
signals in the presence of lensing. If GWs have wavelengths comparable to the
Schwarzschild radius of astrophysical lenses, the... | astro-ph_CO |
Convolution Lagrangian perturbation theory for biased tracers beyond
general relativity: We compare analytic predictions for real and Fourier space two-point
statistics for biased tracers from a variety of Lagrangian Perturbation Theory
approaches against those from state of the art N-body simulations in $f(R)$
Hu-Sa... | astro-ph_CO |
Test of cosmic isotropy in the Planck era: The two fundamental assumptions in cosmology are that the Universe is
statistically homogeneous and isotropic when averaged on large scales. Given
the big implication of these assumptions, there has been a lot of statistical
tests carried out to verify their validity. Since th... | astro-ph_CO |
Composition of Low Redshift Halo Gas: Halo gas in low-z (z<0.5) >0.1L* galaxies in high-resolution, large-scale
cosmological hydrodynamic simulations is examined with respect to three
components: (cold, warm, hot) with temperatures equal to (<10^5, 10^{5-6},
>10^6)K, respectively. The warm component is compared, utiliz... | astro-ph_CO |
Describing variations of the Fisher-matrix across parameter space: Forecasts in cosmology, both with Monte-Carlo Markov-chain methods and with
the Fisher matrix formalism, depend on the choice of the fiducial model because
both the signal strength of any observable as well as the model nonlinearities
linking observable... | astro-ph_CO |
The effects of baryon physics, black holes and AGN feedback on the mass
distribution in clusters of galaxies: The spatial distribution of matter in clusters of galaxies is mainly
determined by the dominant dark matter component, however, physical processes
involving baryonic matter are able to modify it significantly... | astro-ph_CO |
Distribution function approach to redshift space distortions. Part IV:
perturbation theory applied to dark matter: We develop a perturbative approach to redshift space distortions (RSD) using
the phase space distribution function approach and apply it to the dark matter
redshift space power spectrum and its moments. ... | astro-ph_CO |
Interplanetary Dust as a Foreground for the LiteBIRD CMB Satellite
Mission: As ever-more sensitive experiments are made in the quest for primordial CMB B
Modes, the number of potentially significant astrophysical contaminants becomes
larger as well. Thermal emission from interplanetary dust, for example, has
been det... | astro-ph_CO |
Cospatial 21 cm and metal-line absorbers in the epoch of reionization --
I : Incidence and observability: Overdense, metal-rich regions, shielded from stellar radiation might remain
neutral throughout reionization and produce metal as well as 21 cm absorption
lines. Simultaneous absorption from metals and 21 cm can c... | astro-ph_CO |
The Majority of Compact Massive Galaxies at z~2 are Disk Dominated: We investigate the stellar structure of massive, quiescent galaxies at z~2,
based on Hubble Space Telescope/WFC3 imaging from the Early Release Science
program. Our sample of 14 galaxies has stellar masses of M* > 10^{10.8} Msol
and photometric redshif... | astro-ph_CO |
Constraining Quasar and IGM Properties Through Bubble Detection in
Redshifted 21-cm Maps: The infrared detection of a z>7 quasar has opened up a new window to directly
probe the IGM during the epoch of reionization. In this paper we theoretically
consider the possibility of detecting the ionized bubble around a z=8 q... | astro-ph_CO |
Empirical predictions for (sub-)millimeter line and continuum deep
fields: [abridged] Modern (sub-)millimeter/radio interferometers will enable us to
measure the dust and molecular gas emission from galaxies that have
luminosities lower than the Milky Way, out to high redshifts and with
unprecedented spatial resoluti... | astro-ph_CO |
Photometric Calibrations for 21st Century Science: The answers to fundamental science questions in astrophysics, ranging from
the history of the expansion of the universe to the sizes of nearby stars,
hinge on our ability to make precise measurements of diverse astronomical
objects. As our knowledge of the underlying p... | astro-ph_CO |
The optical spectra of X-shaped radio galaxies: X-shaped radio galaxies are defined by their peculiar large-scale radio
morphology. In addition to the classical double-lobed structure they have a
pair of low-luminosity wings that straddles the nucleus at almost right angles
to the active lobes, thus giving the impressi... | astro-ph_CO |
Constraints on Cosmographic Functions of Cosmic Chronometers Data Using
Gaussian Processes: We study observational constraints on the cosmographic functions up to the
fourth derivative of the scale factor with respect to cosmic time, i.e., the
so-called snap function, using the non-parametric method of Gaussian Proce... | astro-ph_CO |
Designing Horndeski and the effective fluid approach: We present a family of designer Horndeski models, i.e. models that have a
background exactly equal to that of the $\Lambda$CDM model but perturbations
given by the Horndeski theory. Then, we extend the effective fluid approach to
Horndeski theories, providing simple... | astro-ph_CO |
Ghostly Galaxies as Solitons of Bose-Einstein Dark Matter: The large dark cores of common dwarf galaxies are unexplained by the standard
heavy particle interpretation of dark matter.
This puzzle is exacerbated by the discovery of a very large but barely
visible, dark matter dominated galaxy Antlia II orbiting the Mil... | astro-ph_CO |
Neutrino signals from Neutron Star implosions to Black Holes: We calculate the neutrino luminosity in an astrophysical scenario where dark
matter is captured by a neutron star which eventually implodes to form a low
mass black hole. The Trojan horse scenario involves the collapse of a neutron
star (NS) due to the accum... | astro-ph_CO |
Effect of halo bias and Lyman Limit Systems on the history of cosmic
reionization: We extend the existing analytical model of reionization by Furlanetto et al.
(2004) to include the biasing of reionization sources and additional absorption
by Lyman Limit systems. Our model is, by construction, consistent with the
obs... | astro-ph_CO |
The WiggleZ Dark Energy Survey: measuring the cosmic expansion history
using the Alcock-Paczynski test and distant supernovae: Astronomical observations suggest that today's Universe is dominated by a
dark energy of unknown physical origin. One of the most notable consequences in
many models is that dark energy shoul... | astro-ph_CO |
UV-to-FIR analysis of Spitzer/IRAC sources in the Extended Groth Strip
II: Photometric redshifts, Stellar masses and Star formation rates: Based on the ultraviolet to far-infrared photometry already compiled and
presented in a companion paper (Barro et al. 2011a, Paper I), we present a
detailed SED analysis of nearly... | astro-ph_CO |
Oxford SWIFT IFS and multi-wavelength observations of the Eagle galaxy
at z=0.77: The `Eagle' galaxy at a redshift of 0.77 is studied with the Oxford Short
Wavelength Integral Field Spectrograph (SWIFT) and multi-wavelength data from
the All-wavelength Extended Groth strip International Survey (AEGIS). It was
chosen ... | astro-ph_CO |
Stellar population gradients in the cores of nearby field E+A galaxies: We have selected a sample of local E+A galaxies from the Sloan Digital Sky
Survey (SDSS) Data Release 7 for follow up integral field spectroscopy with the
Wide Field Spectrograph (WiFeS) on the ANU 2.3-m telescope. The sample was
selected using the... | astro-ph_CO |
There is No Missing Satellites Problem: A critical challenge to the cold dark matter (CDM) paradigm is that there are
fewer satellites observed around the Milky Way than found in simulations of
dark matter substructure. We show that there is a match between the observed
satellite counts corrected by the detection effic... | astro-ph_CO |
Cosmology before noon with multiple galaxy populations: Near-future facilities observing the high-redshift universe ($2<z<5$) will
have an opportunity to take advantage of "multi-tracer" cosmology by observing
multiple tracers of the matter density field: Lyman alpha emitters (LAE), Lyman
break galaxies (LBG), and CMB ... | astro-ph_CO |
Interpreting the Clustering of Distant Red Galaxies: We analyze the angular clustering of z~2.3 distant red galaxies (DRGs)
measured by Quadri et al 2008. We find that, with robust estimates of the
measurement errors and realistic halo occupation distribution modeling, the
measured clustering can be well fit within sta... | astro-ph_CO |
Where stars form and live at high redshift: clues from the infrared: The relation between dark matter halos and the loci of star formation at high
redshift is a pressing question in contemporary cosmology. Matching the
abundance of halos to the abundance of infrared (IR) galaxies, we explicit the
link between dark matt... | astro-ph_CO |
Cyclic Cosmology from the Little Rip: We revisit a cyclic cosmology scenario proposed in 2007 to examine whether
its hypotheses can be sustained if the underlying big rip evolution, which was
assumed there, is replaced by the recently proposed little rip. We show that
the separation into causal patches at turnaround is... | astro-ph_CO |
Redshift drift in varying speed of light cosmology: We derive a redshift drift formula within the framework of varying speed of
light (VSL) theory using the specific ansatz for the variability of $c(t) = c_0
a^n(t)$. We show that negative values of the parameter $n$, which correspond to
diminishing value of the speed o... | astro-ph_CO |
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