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Title: The blue host galaxy of the red GRB 000418
Authors: Gorosabel, J.
Castro-Tirado, A. J.
Gorosabel, J.
Lund, N.
Gorosabel, J.
Fruchter, A.
Burud, I.
Rhoads, J.
Klose, S.
Christensen, L.
Fynbo, J. P. U.
Fynbo, J. P. U.
Hjorth, J.
Jensen, B. L.
Pedersen, H.
Greiner, J.
Tanvir, N.
Holland, S. T.
Jaunsen, A. O.
Vreeswijk, P. M.
Castro Cerón JM
Pian, E.
Frontera, F.
Frontera, F.
Masetti, N.
Palazzi, E.
Kaper, L.
Rol, E.
Salamanca, I.
Wijers, R. A. M. J.
Van Den Heuvel E
Kouveliotou, C.
First Published: Oct-2003
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2003, 409 (1), pp. 123-133
Abstract: We report on multi-band ( $UBVRIZJ_{\rm s}K_{\rm s}$) observations of the host galaxy of the April 18, 2000 gamma-ray burst. The Spectral Energy Distribution (SED) is analysed by fitting empirical and synthetic spectral templates. We find that: (i) the best SED fit is obtained with a starburst template, (ii) the photometric redshift is consistent with the spectroscopic redshift, (iii) the colours of the host are inconsistent with an old stellar population, and (iv) the global extinction is constrained to be in the range AV=0.12- 0.61 mag. The derived global extinction agrees with the one reported for the afterglow ( AV = 0.4- 0.9 mag), suggesting a homogeneous distribution of the interstellar medium (ISM) in the host galaxy. These findings are supplemented by morphological information from Hubble Space Telescope (HST) imaging: the surface brightness profile is smooth, symmetric and compact with no underlying structures (like dust lanes, spiral arms or disks). A natural scenario which accounts of all the above results is a nuclear starburst that harbours a young population of stars from which the GRB originated.
DOI Link: 10.1051/0004-6361:20031047
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2003 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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