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An Independent Measurement of the Incidence of MgII Absorbers along Gamma-Ray Burst Sightlines: the End of the Mystery?
A. Cucchiara, J. X. Prochaska, G. Zhu +15
In 2006, Prochter et al. reported a statistically significant enhancement of very strong Mg II absorption systems intervening the sightlines to gamma-ray bursts (GRBs) relative to…
PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33
Geraint F. Lewis, Robert Braun, Alan W. McConnachie +12
Large scale surveys of the prominent members of the Local Group have provided compelling evidence for the hierarchical formation of massive galaxies, revealing a wealth of substruc…
Three newly discovered globular clusters in NGC 6822
Avon Huxor, Annette Ferguson, Jovan Veljanoski +2
We present three newly discovered globular clusters (GCs) in the Local Group dwarf irregular NGC 6822. Two are luminous and compact, while the third is a very low luminosity diffus…
Young accreted globular clusters in the outer halo of M31
A. D. Mackey, A. P. Huxor, A. M. N. Ferguson +6
We report on Gemini/GMOS observations of two newly discovered globular clusters in the outskirts of M31. These objects, PAndAS-7 and PAndAS-8, lie at a galactocentric radius of ~87…
The Afterglow and ULIRG Host Galaxy of the Dark Short GRB 120804A
E. Berger, B. A. Zauderer, A. Levan +12
We present the optical discovery and sub-arcsecond optical and X-ray localization of the afterglow of the short GRB 120804A, as well as optical, near-IR, and radio detections of it…
A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part II); Distances to the Satellites of M31
Anthony R. Conn, Rodrigo A. Ibata, Geraint F. Lewis +10
In `A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (PART I),' a new technique was introduced for obtaining distances using the TRGB standard candle. Here we des…
Illuminating the Darkest Gamma-Ray Bursts with Radio Observations
B. A. Zauderer, E. Berger, R. Margutti +15
We present X-ray, optical, near-infrared, and radio observations of GRBs 110709B and 111215A, as well as optical and near-IR observations of their host galaxies. The combination of…
TOUGH: Observational aspects of gamma-ray burst host galaxies
Jens Hjorth, Daniele Malesani, Andreas O. Jaunsen +11
GRB-selected galaxies are broadly known to be faint, blue, young, star-forming dwarf galaxies. This insight, however, is based in part on heterogeneous samples of optically selecte…
Galaxy counterparts of intervening high-z sub-DLAs/DLAs and MgII absorbers towards gamma-ray bursts
S. Schulze, J. P. U. Fynbo, B. Milvang-Jensen +19
We present the first search for galaxy counterparts of intervening high-z (2<z< 3.6) sub-DLAs and DLAs towards GRBs. Our final sample comprises of five intervening sub-DLAs and DLA…
The optically unbiased GRB host (TOUGH) survey. VI. Radio observations at z<1 and consistency with typical star-forming galaxies
Michał J. Michałowski, A. Kamble, J. Hjorth +19
The objective of this paper is to determine the level of obscured star formation activity and dust attenuation in a sample of gamma-ray burst (GRB) hosts; and to test the hypothesi…
GRB 100219A with X-shooter - abundances in a galaxy at z = 4.7
C. C. Thoene, J. P. U. Fynbo, P. Goldoni +24
Abundances of galaxies at redshifts z > 4 are difficult to obtain from damped Ly α (DLA) systems in the sightlines of quasars (QSOs) due to the Ly α forest blanketing and the low n…
The JCMT Nearby Galaxies Legacy Survey VIII. CO data and the L(CO3-2)-L(FIR) correlation in the SINGS sample
C. D. Wilson, B. E. Warren, F. P. Israel +57
The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey (NGLS) comprises an HI-selected sample of 155 galaxies spanning all morphological types with distances less than 25…
Dynamics in the satellite system of Triangulum: Is AndXXII a dwarf satellite of M33?
S. C. Chapman, L. Widrow, M. L. M. Collins +10
We present results from a spectroscopic survey of the dwarf spheroidal And XXII and the two extended clusters EC1 and EC2. These three objects are candidate satellites of the Trian…
The optically unbiased GRB host (TOUGH) survey. III. Redshift distribution
P. Jakobsson, J. Hjorth, D. Malesani +7
We present 10 new gamma-ray burst (GRB) redshifts and another five redshift limits based on host galaxy spectroscopy obtained as part of a large program conducted at the Very Large…
The optically unbiased GRB host (TOUGH) survey. V. VLT/X-shooter emission-line redshifts for Swift GRBs at z~2
Thomas Krühler, Daniele Malesani, Bo Milvang-Jensen +7
We present simultaneous optical and near-infrared (NIR) spectroscopy of 19 Swift GRB host galaxies with VLT/X-shooter with the aim of measuring their redshifts. Galaxies were selec…
The optically unbiased GRB host (TOUGH) survey. I. Survey design and catalogs
Jens Hjorth, Daniele Malesani, Páll Jakobsson +11
Long-duration gamma-ray bursts (GRBs) are powerful tracers of star-forming galaxies. We have defined a homogeneous subsample of 69 Swift GRB-selected galaxies spanning a very wide…
Detailed optical and near-infrared polarimetry, spectroscopy and broadband photometry of the afterglow of GRB 091018: Polarisation evolution
K. Wiersema, P. A. Curran, T. Kruehler +30
[Abridged] A number of phenomena have been observed in GRB afterglows that defy explanation by simple versions of the standard fireball model, leading to a variety of new models. P…
The structure of star clusters in the outer halo of M31
N. R. Tanvir, A. D. Mackey, A. M. N. Ferguson +11
We present a structural analysis of halo star clusters in M31 based on deep Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. The clusters in our sample span…
Broadband study of GRB 091127: a sub-energetic burst at higher redshift?
E. Troja, T. Sakamoto, C. Guidorzi +21
GRB 091127 is a bright gamma-ray burst (GRB) detected by Swift at a redshift z=0.49 and associated with SN 2009nz. We present the broadband analysis of the GRB prompt and afterglow…
The origin of the early time optical emission of Swift GRB 080310
O. M. Littlejohns, R. Willingale, P. T. O'Brien +28
We present broadband multi-wavelength observations of GRB 080310 at redshift z = 2.43. This burst was bright and long-lived, and unusual in having extensive optical and near IR fol…
Star formation in the early universe: beyond the tip of the iceberg
N. R. Tanvir, A. J. Levan, A. S. Fruchter +18
We present late-time Hubble Space Telescope imaging of the fields of six Swift GRBs lying at 5.0<z<9.5. Our data includes very deep observations of the field of the most distant sp…