Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-25
Astron.Astrophys. 489 (2008) 37-48
Astronomy and Astrophysics
Astrophysics
13 pages, 6 figures, submitted to A&A; revised version: accepted for publication in A&A, analysis of HST images and Subaru spe
Scientific paper
10.1051/0004-6361:20078549
We present early (starting 1.6h after the burst) WHT/ISIS optical spectroscopy of the afterglow of the gamma-ray burst GRB 060206 detecting a range of metal absorption lines and their fine-structure transitions. Additional information is provided by the afterglow lightcurve. The resolution and wavelength range of the spectra and the bright afterglow facilitate a detailed study and fitting of the absorption line systems in order to derive column densities. We also use deep imaging to detect the host galaxy and probe the nature of an intervening system at z = 1.48 seen in absorption in the afterglow spectra. We detect four discrete velocity systems in the resonant metal absorption lines, best explained by shells within and/or around the host created by starburst winds. The fine-structure lines have no less than three components with strengths decreasing from the redmost components. We therefore suggest that the fine-structure lines are best explained to be produced by UV pumping from which follows that the redmost component is the one closest to the burst where also NV was detected. The host is detected in deep HST imaging with F814W_AB = 27.48 +- 0.19 mag and a 3 sigma upper limit of H = 20.6 mag (Vega) is achieved. A candidate counterpart for the intervening absorption system is detected as well, which is quite exceptional for an absorber in the sightline towards a GRB afterglow. The intervening system shows no temporal evolution as claimed by Hao et al. (2007) which we prove from our WHT spectra taken before and Subaru spectra taken during the observations from Hao et al.
Curran Peter A.
de Ugarte Postigo Antonio
der Horst Alexander J. van
Fynbo Johan P. U.
Gorosabel Javier
No associations
LandOfFree
The host of GRB 060206: kinematics of a distant galaxy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The host of GRB 060206: kinematics of a distant galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The host of GRB 060206: kinematics of a distant galaxy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-599498