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Galaxy counterparts of intervening high-z sub-DLAs/DLAs and Mg ii absorbers towards gamma-ray bursts
Galaxy counterparts of intervening high-z sub-DLAs/DLAs and Mg ii absorbers towards gamma-ray bursts
We present the first search for galaxy counterparts of intervening high-z (2 < z < 3.6) sub-damped Lyα absorbers (sub-DLAs) and DLAs towards gamma-ray bursts (GRBs). Our final sample comprises five intervening sub-DLAs and DLAs in four GRB fields. To identify candidate galaxy counterparts of the absorbers we used deep optical- and near-infrared imaging, and low-, mid- and high-resolution spectroscopy acquired with 6-m to 10-m class telescopes, the Hubble and the Spitzer Space Telescopes. Furthermore, we used the spectroscopic information and spectral-energy-distribution fitting techniques to study them in detail. Our main result is the detection and spectroscopic confirmation of the galaxy counterpart of the intervening DLA at z = 3.096 in the field of GRB 070721B (zGRB = 3.6298) as proposed by other authors. We also identify good candidates for the galaxy counterparts of the two strong Mg ii absorbers at z = 0.6915 and 1.4288 towards GRB 050820A (zGRB = 2.615). The properties of the detected DLA galaxy are typical for Lyman-break galaxies (LBGs) at similar redshifts; a young, highly star-forming galaxy that shows evidence for a galactic outflow. This supports thehypothesis that a DLA can be the gaseous halo of an LBG. In addition, we report a redshift coincidence of different objects associated with metal lines in the same field, separated by 130–161 kpc. The high detection rate of three correlated structures on a length scale as short as ~150 kpc in two pairs of lines of sight is intriguing. The absorbers in each of these are most likely not part of the same gravitationally bound structure. They more likely represent groups of galaxies.
- KOBENHAVNS UNIVERSITET Denmark
- University of Leicester, Department of Physics and Astronomy United Kingdom
- European Southern Observatory Germany
- Department of Physics and Astronomy University College London United Kingdom
- California Institute of Technology United States
arXiv: Astrophysics::High Energy Astrophysical Phenomena Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics::Galaxy Astrophysics
gamma ray burst, Aérospatiale, astronomie & astrophysique, Physical, chemical, mathematical & earth Sciences, Physique, chimie, mathématiques & sciences de la terre, quasars, Space science, astronomy & astrophysics, galaxy formation
gamma ray burst, Aérospatiale, astronomie & astrophysique, Physical, chemical, mathematical & earth Sciences, Physique, chimie, mathématiques & sciences de la terre, quasars, Space science, astronomy & astrophysics, galaxy formation
arXiv: Astrophysics::High Energy Astrophysical Phenomena Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics::Galaxy Astrophysics
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citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average
Citations provided by BIP!Popularity provided by BIP!- KOBENHAVNS UNIVERSITET Denmark
- University of Leicester, Department of Physics and Astronomy United Kingdom
- European Southern Observatory Germany
- Department of Physics and Astronomy University College London United Kingdom
- California Institute of Technology United States
- University of California System United States
- Department of Physics and Astronomy University of Sussex United Kingdom
- Department of Physics and Astronomy University of Glasgow United Kingdom
- Thüringer Landessternwarte Tautenburg Germany
- Department of Physics and Astronomy University of Western Ontario Canada
- University of Chicago United States
- University of Leicester United Kingdom
- Université de Liège (ULiège) Belgium
- University of Warwick United Kingdom
- ULiège Belgium
- Astrophysikalisches Institut Potsdam Germany
- University of Iceland Iceland
- European Southern Observatory Chile
- Department of Physics and Astronomy University of British Columbia Canada
- University of Hertfordshire United Kingdom
- University of Victoria Canada
- Universié de Liège Belgium
- Department of Physics and Astronomy The University of Manchester United Kingdom
- University of Liège Belgium
We present the first search for galaxy counterparts of intervening high-z (2 < z < 3.6) sub-damped Lyα absorbers (sub-DLAs) and DLAs towards gamma-ray bursts (GRBs). Our final sample comprises five intervening sub-DLAs and DLAs in four GRB fields. To identify candidate galaxy counterparts of the absorbers we used deep optical- and near-infrared imaging, and low-, mid- and high-resolution spectroscopy acquired with 6-m to 10-m class telescopes, the Hubble and the Spitzer Space Telescopes. Furthermore, we used the spectroscopic information and spectral-energy-distribution fitting techniques to study them in detail. Our main result is the detection and spectroscopic confirmation of the galaxy counterpart of the intervening DLA at z = 3.096 in the field of GRB 070721B (zGRB = 3.6298) as proposed by other authors. We also identify good candidates for the galaxy counterparts of the two strong Mg ii absorbers at z = 0.6915 and 1.4288 towards GRB 050820A (zGRB = 2.615). The properties of the detected DLA galaxy are typical for Lyman-break galaxies (LBGs) at similar redshifts; a young, highly star-forming galaxy that shows evidence for a galactic outflow. This supports thehypothesis that a DLA can be the gaseous halo of an LBG. In addition, we report a redshift coincidence of different objects associated with metal lines in the same field, separated by 130–161 kpc. The high detection rate of three correlated structures on a length scale as short as ~150 kpc in two pairs of lines of sight is intriguing. The absorbers in each of these are most likely not part of the same gravitationally bound structure. They more likely represent groups of galaxies.