The blue host galaxy of the red GRB 000418

J. Gorosabel, S. Klose, L. Christensen, J. P.U. Fynbo, J. Hjorth, J. Greiner, N. Tanvir, B. L. Jensen, H. Pedersen, S. T. Holland, N. Lund, A. O. Jaunsen, J. M. Castro Cerón, A. J. Castro-Tirado, A. Fruchter, E. Pian, P. M. Vreeswijk, I. Burud, F. Frontera, L. KaperC. Kouveliotou, N. Masetti, E. Palazzi, J. Rhoads, E. Rol, I. Salamanca, R. A.M.J. Wijers, E. Van Den Heuvel

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

We report on multi-band (U BVRIZJsKs) 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.

Original languageEnglish (US)
Pages (from-to)123-133
Number of pages11
JournalAstronomy and Astrophysics
Volume409
Issue number1
DOIs
StatePublished - Oct 2003

Keywords

  • Galaxies: fundamental parameters
  • Gamma rays: bursts
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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