Search
Now showing items 1-10 of 244
Dynamical constraints on the Local Group from the CMB and 2MRS dipoles
(Oxford University Press (OUP), 2008)
We place constraints on the dynamics of the Local Group (LG) by comparing the dipole of the Cosmic Microwave Background (CMB) with the peculiar velocity induced by the 2MRS galaxy sample. The analysis is limited by the ...
Event Horizon Telescope Evidence for Alignment of the Black Hole in the Center of the Milky Way With the Inner Stellar Disk
(IOP Publishing, 2014)
Observations of the black hole in the center of the Milky Way with the Event Horizon Telescope at 1.3 mm have revealed a size of the emitting region that is smaller than the size of the black-hole shadow. This can be ...
Probing Pre-galactic Metal Enrichment with High-redshift Gamma-ray Bursts
(American Astronomical Society, 2012)
We explore high-redshift gamma-ray bursts (GRBs) as promising tools to probe pre-galactic metal enrichment. We utilize the bright afterglow of a Population III (Pop III) GRB exploding in a primordial dwarf galaxy as a ...
Brightening of an Accretion Disk due to Viscous Dissipation of Gravitational Waves during the Coalescence of Supermassive Black Holes
(American Physical Society, 2008-07-25)
Mergers of supermassive black hole binaries release peak power of up to similar to 10(57)erg s(-1) in gravitational waves (GWs). As the GWs propagate through ambient gas, they induce shear and a small fraction of their ...
Three-Body Kick to a Bright Quasar Out of Its Galaxy during a Merger
(American Astronomical Society, 2006)
The quasar HE 0450-2958 was recently discovered to reside similar to 7 kpc away from a galaxy that was likely disturbed by a recent merger. The lack of a massive spheroid of stars around the quasar raised the unlikely ...
A Subrelativistic Shock Model for the Radio Emission of SN 1998bw
(American Astronomical Society, 1999)
SN 1998bw is the most luminous radio supernova ever observed. Previous discussions argued that its exceptional radio luminosity, similar to 4 x 10(38) ergs s(-1), must originate from a highly relativistic shock that is ...
Consequences of strong compression in tidal disruption events
(Oxford University Press, 2013)
The tidal disruption of a star by a supermassive black hole (SMBH) is a highly energetic event with consequences dependent on the degree to which the star plunges inside the SMBH's tidal sphere. We introduce a new analytic ...
Distortion of the Luminosity Function of High-redshift Galaxies by Gravitational Lensing
(American Astronomical Society, 2015)
The observed properties of high - redshift galaxies depend on the underlying foreground distribution of large - scale structure, which distorts their intrinsic properties via gravitational lensing. We focus on the regime ...
Constraining the unexplored period between the dark ages and reionization with observations of the global 21 cm signal
(American Physical Society, 2010)
Observations of the frequency dependence of the global brightness temperature of the redshifted 21 cm line of neutral hydrogen may be possible with single dipole experiments. In this paper, we develop a Fisher matrix ...
Gravitational waves from scattering of stellar-mass black holes in galactic nuclei
(Oxford University Press, 2009)
Stellar-mass black holes (BHs) are expected to segregate and form a steep density cusp around supermassive black holes (SMBHs) in galactic nuclei. We follow the evolution of a multimass system of BHs and stars by numerically ...