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A nearby GRB host prototype for z~7 Lyman-break galaxies: Spitzer-IRS and X-shooter spectroscopy of the host galaxy of GRB031203
D. Watson, J. French, L. Christensen +7
Gamma-ray burst (GRB) host galaxies have been studied extensively in optical photometry and spectroscopy. Here we present the first mid-infrared spectrum of a GRB host, HG031203. I…
VLT/X-shooter spectroscopy of the GRB 090926A afterglow
V. D'Elia, J. P. U. Fynbo, S. Covino +21
The aim of this paper is to study the environment and intervening absorbers of the gamma-ray burst GRB 090926A through analysis of optical spectra of its afterglow. We analyze medi…
Dust grain growth in the interstellar medium of 5<z<6.5 quasars
Michał J. Michałowski, Eric J. Murphy, Jens Hjorth +3
We investigate whether stellar dust sources i.e. asymptotic giant branch (AGB) stars and supernovae (SNe) can account for dust detected in 5<z<6.5 quasars (QSOs). We calculate the…
Rapid dust production in submillimeter galaxies at z>4?
Michał J. Michałowski, Darach Watson, Jens Hjorth
The existence of submillimeter-selected galaxies (SMGs) at redshifts z>4 has recently been confirmed. Using simultaneously all the available data from UV to radio we have modeled t…
No evidence for dust extinction in GRB 050904 at z ~ 6.3
Tayyaba Zafar, Darach J. Watson, Daniele Malesani +5
Context: GRB afterglows are excellent probes of gas and dust in star-forming galaxies at all epochs. It has been posited that dust in the early Universe must be different from dust…