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|Title:||Identifying the host galaxy of the short GRB 100628A||Authors:||Nicuesa Guelbenzu, A.
Michałowski, M. J.
Kann, D. A.
HUNT, Leslie Kipp
Afonso, P. M. J.
Hartmann, D. H.
Olivares E., F.
Updike, A. C.
|Issue Date:||2015||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||583||First Page:||1||Abstract:||We report on the results of a comprehensive observing campaign to reveal the host galaxy of the short GRB 100628A. This burst was followed by a faint X-ray afterglow but no optical counterpart was discovered. However, inside the X-ray error circle a potential host galaxy at a redshift of z = 0.102 was soon reported in the literature. If this system is the host, then GRB 100628A was the cosmologically most nearby unambiguous short burst with a measured redshift so far. We used the multi-colour imager GROND at the ESO/La Silla MPG 2.2 m telescope, ESO/VLT spectroscopy, and deep Australia Telescope Compact Array (ATCA) radio-continuum observations together with publicly available Gemini imaging data to study the putative host and the galaxies in the field of GRB 100628A. We confirm that inside the X-ray error circle the most probable host-galaxy candidate is the morphologically disturbed, interacting galaxy system at z = 0.102. The interacting galaxies are connected by a several kpc long tidal stream, which our VLT/FORS2 spectroscopy reveals strong emission lines of [O ii], [O iii], Hα and Hβ, characteristic for the class of extreme emission-line galaxies and indicative of ongoing star formation. The latter leaves open the possibility that the GRB progenitor was a member of a young stellar population. However, we indentify a second host-galaxy candidate slightly outside the X-ray error circle. It is a radio-bright, luminous elliptical galaxy at a redshift z = 0.311. With a K-band luminosity of 2 × 10<SUP>11</SUP>L<SUB>☉</SUB> this galaxy resembles the probable giant elliptical host of the first well-localized short burst, GRB 050509B. If this is the host, then the progenitor of GRB 100628A was a member of an old stellar population. <P />Based on observations collected at the Very Large Telescope of the European Southern Observatory, Paranal, Chile (ESO programme 087.D-0503 and 290.D-5194; PI: A. Nicuesa Guelbenzu; 090.A-0825; PI: D. Malesani), GROND (PI: J. Greiner), and ATCA (Program C2840; PI: A. Nicuesa Guelbenzu). Other observations are obtained from the Gemini and WISE Archive Facilities.||Acknowledgments:||A.N.G. acknowledges support by M. Guelbenzu and by grant DFG Kl 766/16-1. A.N.G. and S. Schmidl acknowledge support by the Thüringer Ministerium für Bildung, Wissenschaft und Kultur under FKZ 12010-514. A.N.G. thanks Helmut Meusinger, Thüringer Landessternwarte, for delightful discussions. M.J.M acknowledges the support of the Science and Technology Facilities Council. D.A.K. acknowledges support by TLS Tautenburg, MPE Garching and DFG Kl/766 16-3. A.R. acknowledges support by TLS Tautenburg and DFG Kl/766 13-2. L.K.H., E.P, and A.R. are grateful for support from PRIN-INAF 2012/13. S. Schulze acknowledges support from CONICYT-Chile FONDECYT 3140534, Basal-CATA PFB-06/2007, and Project IC120009 “Millennium Institute of Astrophysics (MAS)” of Iniciativa Científica Milenio del Ministerio de Economía, Fomento y Turismo. Part of the funding for GROND (both hardware and personnel) was generously granted by the Leibniz-Prize to G. Hasinger (DFG grant HA 1850/28-1). The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. A.N.G. and S.K. thank Catarina Ubach Sarah Maddison, Swinburne University, Ivy Wong, CSIRO Sydney, and Jamie Stevens, CSIRO Narrabri, for helpful discussions and observing guidance. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. We thank the anonymous referee for very valuable comments.||URI:||http://hdl.handle.net/20.500.12386/23179||URL:||https://www.aanda.org/articles/aa/full_html/2015/11/aa25160-14/aa25160-14.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201425160||Bibcode ADS:||2015A&A...583A..88N||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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