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12 papers · 2 filters
Helium in natal HII regions: the origin of the X-ray absorption in gamma-ray burst afterglows
Darach Watson, Tayyaba Zafar, Anja C. Andersen +8
Soft X-ray absorption in excess of Galactic is observed in the afterglows of most gamma-ray bursts (GRBs), but the correct solution to its origin has not been arrived at after more…
CLASH: The enhanced lensing efficiency of the highly elongated merging cluster MACS J0416.1-2403
A. Zitrin, M. Meneghetti, K. Umetsu +21
We perform a strong-lensing analysis of the merging galaxy cluster MACS J0416.1-2403 (M0416; z=0.42) in recent CLASH/HST observations. We identify 70 new multiple images and candid…
Slow-Roll Inflation Preceded by a Topological Defect Phase à la Chaplygin Gas
Mariam Bouhmadi-Lopez, Pisin Chen, Yu-Chien Huang +1
We present a simple toy model corresponding to a network of frustrated topological defects of domain walls or cosmic strings that exist previous to the standard slow-roll inflation…
CLASH: Three Strongly Lensed Images of a Candidate z ~ 11 Galaxy
Dan Coe, Adi Zitrin, Mauricio Carrasco +20
We present a candidate for the most distant galaxy known to date with a photometric redshift z = 10.7 +0.6 / -0.4 (95% confidence limits; with z < 9.5 galaxies of known types ruled…
Smoking guns of a bounce in modified theories of gravity through the spectrum of the gravitational waves
Mariam Bouhmadi-Lopez, Joao Morais, Alfredo B. Henriques
We present an inflationary model preceded by a bounce in a metric theory a lá where is the scalar curvature of the space-time. The model is asymptotically de Sitter such…
Miscentring in Galaxy Clusters: Dark Matter to Brightest Cluster Galaxy Offsets in 10,000 SDSS Clusters
Adi Zitrin, Matthias Bartelmann, Keiichi Umetsu +2
We characterise the typical offset between the Dark Matter (DM) projected centre and the Brightest Cluster Galaxy (BCG) in 10,000 SDSS clusters. To place constraints on the centre…