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The Connection between a Lyman Limit System, a very strong OVI Absorber, and Galaxies at z~0.203
N. Lehner, J. X. Prochaska, H. A. Kobulnicky +4
With a column density log N(OVI) = 14.95+/-0.05, the OVI absorber at z_abs~0.2028 observed toward the QSO PKS0312-77 (z_em=0.223) is the strongest yet detected at z<0.5. At nearly…
An 84 microGauss Magnetic Field in a Galaxy at Redshift z=0.692
Arthur M. Wolfe, Regina A. Jorgenson, Timothy Robishaw +2
The magnetic field pervading our Galaxy is a crucial constituent of the interstellar medium: it mediates the dynamics of interstellar clouds, the energy density of cosmic rays, and…
Constraining the star formation histories of GRB Host Galaxies from their observed abundance patterns
F. Calura, M. Dessauges-Zavadsky, J. X. Prochaska +2
Long-duration Gamma Ray Bursts (GRBs) are linked to the collapse of massive stars and their hosts are exclusively identified as active, star forming galaxies. Four long GRBs observ…
GRB 080503: Implications of a Naked Short Gamma-Ray Burst Dominated by Extended Emission
D. A. Perley, B. D. Metzger, J. Granot +22
We report on observations of GRB 080503, a short gamma-ray burst with very bright extended emission (about 30 times the gamma-ray fluence of the initial spike) in conjunction with…
Dust depletion, chemical uniformity and environment of CaII H&K quasar absorbers
Berkeley J. Zych, Michael T. Murphy, Paul C. Hewett +1
CaII 3934,3969 absorbers, which are likely to be a subset of damped Lyman alpha systems, are the most dusty quasar absorbers known, with an order of magnitude more extinction in E(…
Dust Extinction in High-z Galaxies with GRB Afterglow Spectroscopy - The 2175Å Feature at z=2.45
Á. Elíasdóttir, J. P. U. Fynbo, J. Hjorth +8
We report the clear detection of the 2175A dust absorption feature in the optical afterglow spectrum of the gamma-ray burst (GRB) GRB070802 at a redshift of z=2.45. This is the hig…