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41 papers · 2 filters
A matched filter approach for blind joint detection of galaxy clusters in X-ray and SZ surveys
Paula Tarrío, Jean-Baptiste Melin, Monique Arnaud
The combination of X-ray and SZ observations can potentially improve the cluster detection efficiency when compared to using only one of these probes, since both probe the same med…
Vainshtein mechanism after GW170817
Marco Crisostomi, Kazuya Koyama
The almost simultaneous detection of gravitational waves and a short gamma-ray burst from a neutron star merger has put a tight constraint on the difference between the speed of gr…
ATCA observations of the MACS-Planck Radio Halo Cluster Project II. Radio observations of an intermediate redshift cluster sample
G. Martinez Aviles, M. Johnston-Hollitt, C. Ferrari +16
A fraction of galaxy clusters host diffuse radio sources whose origins are investigated through multi-wavelength studies of cluster samples. We investigate the presence of diffuse…
Self-accelerating universe in scalar-tensor theories after GW170817
Marco Crisostomi, Kazuya Koyama
The recent simultaneous detection of gravitational waves and a gamma ray burst from a neutron star merger significantly shrank the space of viable scalar-tensor theories by demandi…
Nonlinear Effective Theory of Dark Energy
Giulia Cusin, Matthew Lewandowski, Filippo Vernizzi
We develop an approach to parametrize cosmological perturbations beyond linear order for general dark energy and modified gravity models characterized by a single scalar degree of…
Sparse estimation of model-based diffuse thermal dust emission
Melis Irfan, Jerome Bobin
Component separation for the Planck HFI data is primarily concerned with the estimation of thermal dust emission, which requires the separation of thermal dust from the cosmic infr…
Dark Energy after GW170817: dead ends and the road ahead
Jose María Ezquiaga, Miguel Zumalacárregui
Multi-messenger gravitational wave (GW) astronomy has commenced with the detection of the binary neutron star merger GW170817 and its associated electromagnetic counterparts. The a…
Action Dynamics of the Local Supercluster
Edward J. Shaya, R. Brent Tully, Yehuda Hoffman +1
The fully nonlinear gravitationally induced trajectories of a nearly complete set of galaxies, groups, and clusters in the Local Supercluster are constructed in a Numerical Action…
Euclid: Superluminous supernovae in the Deep Survey
C. Inserra, R. C. Nichol, D. Scovacricchi +31
In the last decade, astronomers have found a new type of supernova called `superluminous supernovae' (SLSNe) due to their high peak luminosity and long light-curves. These hydrogen…
Weak lensing magnification of SpARCS galaxy clusters
A. Tudorica, H. Hildebrandt, M. Tewes +11
Measuring and calibrating relations between cluster observables is critical for resource-limited studies. The mass-richness relation of clusters offers an observationally inexpensi…
Dark Energy after GW170817 and GRB170817A
Paolo Creminelli, Filippo Vernizzi
The observation of GW170817 and its electromagnetic counterpart implies that gravitational waves travel at the speed of light, with deviations smaller than a few .…
The SDSS-DR12 large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest
Ignasi Pérez-Ràfols, Andreu Font-Ribera, Jordi Miralda-Escudé +9
We present a measurement of the DLA mean bias from the cross-correlation of DLA and the Ly forest, updating earlier results of Font-Ribera et al. 2012 with the final BOSS Data R…
Internal dark matter structure of the most massive galaxy clusters
Amandine M. C. Le Brun, Monique Arnaud, Gabriel W. Pratt +1
We investigate the evolution of the dark matter density profiles of the most massive galaxy clusters in the Universe. Using a `zoom-in' procedure on a large suite of cosmological s…
Recovering galaxy cluster gas density profiles with XMM-Newton and Chandra
I. Bartalucci, M. Arnaud, G. W. Pratt +6
We examine the reconstruction of galaxy cluster radial density profiles obtained from Chandra and XMM X-ray observations, using high quality data for a sample of twelve objects cov…
The influence of Host Galaxies in Type Ia Supernova Cosmology
Syed A. Uddin, Jeremy Mould, Chris Lidman +2
We use a sample of 1338 spectroscopically confirmed and photometrically classified Type Ia Supernovae (SNe Ia), sourced from the CSP, CfA, SDSS-II, and SNLS supernova samples, to e…
A comparison of Einstein-Boltzmann solvers for testing General Relativity
E. Bellini, A. Barreira, N. Frusciante +24
We compare Einstein-Boltzmann solvers that include modifications to General Relativity and find that, for a wide range of models and parameters, they agree to a high level of preci…
Cosmological Perturbation Theory Using the FFTLog: Formalism and Connection to QFT Loop Integrals
Marko Simonović, Tobias Baldauf, Matias Zaldarriaga +2
We present a new method for calculating loops in cosmological perturbation theory. This method is based on approximating a CDM-like cosmology as a finite sum of complex power-la…
Cosmicflows-3: Cold Spot Repeller?
Helene M. Courtois, R. Brent Tully, Yehuda Hoffman +3
The three-dimensional gravitational velocity field within z~0.1 has been modeled with the Wiener filter methodology applied to the Cosmicflows-3 compilation of galaxy distances. Th…
Radio selection of the most distant galaxy clusters
E. Daddi, S. Jin, V. Strazzullo +15
We show that the most distant X-ray detected cluster known to date, ClJ1001 at z=2.506, hosts a strong overdensity of radio sources. Six of them are individually detected (within 1…
Galaxy cluster luminosities and colours, and their dependence on cluster mass and merger state
Sarah L. Mulroy, Sean L. McGee, Steven Gillman +5
We study a sample of 19 galaxy clusters in the redshift range with highly complete spectroscopic membership catalogues (to ) from the Arizona…
X-Ray morphological analysis of the Planck ESZ clusters
Lorenzo Lovisari, William R. Forman, Christine Jones +7
X-ray observations show that galaxy clusters have a very large range of morphologies. The most disturbed systems which are good to study how clusters form and grow and to test phys…
Baryon acoustic oscillations from the complete SDSS-III Ly-quasar cross-correlation function at
Hélion du Mas des Bourboux, Jean-Marc Le Goff, Michael Blomqvist +22
We present a measurement of baryon acoustic oscillations (BAO) in the cross-correlation of quasars with the Ly-forest flux-transmission at a mean redshift . The measurem…
Dark Energy Survey Year 1 Results: Curved-Sky Weak Lensing Mass Map
C. Chang, A. Pujol, B. Mawdsley +117
We construct the largest curved-sky galaxy weak lensing mass map to date from the DES first-year (DES Y1) data. The map, about 10 times larger than previous work, is constructed ov…
Sparse reconstruction of the merging A520 cluster system
Austin Peel, François Lanusse, Jean-Luc Starck
Merging galaxy clusters present a unique opportunity to study the properties of dark matter in an astrophysical context. These are rare and extreme cosmic events in which the bulk…