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Reconciling the Metallicity Distributions of Gamma-ray Burst, Damped Lyman-alpha, and Lyman-break Galaxies at z=3
Johan P. U. Fynbo, J. Xavier Prochaska, Jesper Sommer-Larsen +2
We test the hypothesis that the host galaxies of long-duration gamma-ray bursts (GRBs) as well as quasar-selected damped Lyman-alpha (DLA) systems are drawn from the population of…
The nature of the dwarf starforming galaxy associated with GRB 060218 / SN2006aj
K. Wiersema, S. Savaglio, P. M. Vreeswijk +9
We present high resolution VLT UVES and low resolution FORS optical spectroscopy of supernova 2006aj and its host galaxy, associated with the nearby (z = 0.03342) gamma-ray burst G…
An on-going multi-wavelength survey of Ly-alpha emitters at redshifts z = 2 - 8
Kim K. Nilsson, Johan P. U. Fynbo, Palle Moller +1
In the last decade, the technique of finding Ly-alpha emitters through narrow-band imaging has become a promising method of detecting high redshift galaxies. Ly-alpha emitters have…
Photometry with FORS at the ESO VLT
W. Freudling, M. Romaniello, F. Patat +3
ESO's two FOcal Reducer and low dispersion Spectrographs (FORS) are the primary imaging cameras for the VLT. Since they are not direct-imaging cameras, the accuracy of photometry w…
Constraints on an optical afterglow and on supernova light following the short burst GRB 050813
P. Ferrero, S. F. Sanchez, D. A. Kann +18
We report early follow-up observations of the error box of the short burst 050813 using the telescopes at Calar Alto and at Observatorio Sierra Nevada (OSN), followed by deep VLT/F…
Three intervening galaxy absorbers towards GRB060418: faint and dusty?
Sara L. Ellison, Paul Vreeswijk, Cedric Ledoux +8
We present an analysis of three strong, intervening Mg II absorption systems (z_abs = 0.603, 0.656, 1.107) towards the optical afterglow of gamma-ray burst (GRB) 060418. From high…
Velocity-Metallicity Correlation for high-z DLA Galaxies: Evidence for a Mass-Metallicity Relation?
C. Ledoux, P. Petitjean, J. P. U. Fynbo +2
We used our database of VLT-UVES quasar spectra to build up a sample of 70 Damped Lyman-alpha (DLA) or strong sub-DLA systems with total neutral hydrogen column densities of log N(…
Physics of the GRB 030328 afterglow and its environment
E. Maiorano, N. Masetti, E. Palazzi +30
We report on the photometric, spectroscopic and polarimetric, monitoring of the optical afterglow of Gamma-Ray Burst (GRB) 030328 detected by HETE-2. Photometry, collected at 7 dif…
An optical supernova associated with the X-ray flash XRF 060218
E. Pian, P. A. Mazzali, N. Masetti +42
Long-duration gamma-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supe…
A Lyman-alpha blob in the GOODS South field: evidence for cold accretion onto a dark matter halo
Kim Nilsson, Johan P. U. Fynbo, Palle Moller +2
We report on the discovery of a z = 3.16 Lyman-alpha emitting blob in the GOODS South field. The blob has a total Ly-alpha luminosity of ~ 10^(43) erg s^(-1) and a diameter larger…
Multi-Wavelength Studies of the Optically Dark Gamma-Ray Burst 001025A
K. Pedersen, K. Hurley, J. Hjorth +18
We identify the fading X-ray afterglow of GRB 001025A from XMM-Newton observations obtained 1.9-2.3 days, 2 years, and 2.5 years after the burst. The non-detection of an optical co…
Tracing large-scale structure at high redshift with Lyman-alpha emitters: the effect of peculiar velocities
P. Monaco, P. Moller, J. Fynbo +3
We investigate the effect of peculiar velocities on the redshift space distribution of z>~2 galaxies, and we focus in particular on Ly-alpha emitters. We generate catalogues of dar…
On the Afterglow and Host Galaxy of GRB021004: A Comprehensive Study with the Hubble Space Telescope
J. P. U. Fynbo, J. Gorosabel, A. Smette +24
(Abridged) We report on HST observations of the late-time afterglow and host galaxy of GRB021004 (z=2.33). Although this GRB is one of the best observed so far, there is substantia…
Ly-alpha and UV emission from high-redshift GRB hosts: To what extent do GRBs trace star formation?
P. Jakobsson, G. Bjornsson, J. P. U. Fynbo +9
We report the result of a search for Ly-alpha emission from the host galaxies of the gamma-ray bursts (GRBs) 030226 (z = 1.986), 021004 (z = 2.335) and 020124 (z = 3.198). We find…
The mass-metallicity relation for high-redshift damped Ly-alpha galaxies
C. Ledoux, P. Petitjean, P. Moller +2
We used our database of ESO VLT-UVES spectra of quasars to build up a sample of 67 Damped Lyman-alpha (DLA) systems with redshifts 1.7<zabs<3.7. For each system, we measured averag…
The extended Lyman-alpha emission surrounding the z=3.04 radio-quiet QSO1205-30: Primordial infalling gas illuminated by the quasar?
M. Weidinger, P. Moller, J. P. U. Fynbo +1
We present spectroscopic observations obtained with the FORS1 instrument on the ESO VLT under good seeing conditions of the radio-quiet z_em = 3.04 quasar Q1205-30 and its associat…
The first detection of [OIII] emission from high-redshift damped Lyman-alpha galaxies
S. J. Weatherley, S. J. Warren, P. Moller +3
We present the detection of [OIII] emission lines from the galaxies responsible for two high-redshift z>1.75 damped Lyman-alpha (DLA) absorption lines. These are the first detectio…
The Lyman-alpha glow of gas falling into the dark matter halo of a z=3 galaxy
Michael Weidinger, Palle Moller, Johan P. U. Fynbo
Quasars are the visible signatures of super-massive black holes in the centres of distant galaxies. It has been suggested that quasars are formed during ``major merger events'' whe…
Detection of Lyman-alpha emission from a DLA galaxy: Possible implications for a luminosity-metallicity relation at z = 2-3
P. Moller, J. P. U. Fynbo, S. M. Fall
In an ongoing programme to identify a sample of high z DLA galaxies we have found the long sought for case of a Ly-alpha emitter seen in the centre of a broad DLA trough. This is t…
GRB 020410: A Gamma-Ray Burst Afterglow Discovered by its Supernova Light
A. Levan, P. Nugent, A. Fruchter +19
We present the discovery and monitoring of the optical transient (OT) associated with GRB 020410. The fading OT was found by Hubble Space Telescope (HST) observations taken 28 and…
On the jet structure and magnetic field configuration of GRB 020813
D. Lazzati, S. Covino, J. Gorosabel +32
The polarization curve of GRB 020813 is discussed and compared to different models for the structure, evolution and magnetisation properties of the jet and the interstellar medium…
New search strategy for high z intervening absorbers: GRB021004, a pilot study
P. M. Vreeswijk, P. Moller, J. P. U. Fynbo
We present near-infrared narrow- and broad-band imaging of the field of GRB021004, performed with ISAAC on the UT1 of the ESO Very Large Telescope. The narrow-band filters were cho…
Very high column density and small reddening towards GRB 020124 at z = 3.20
J. Hjorth, P. Møller, J. Gorosabel +27
We present optical and near-infrared observations of the dim afterglow of GRB 020124, obtained between 2 and 68 hours after the gamma-ray burst. The burst occurred in a very faint…
On the Ly-alpha emission from gamma-ray burst host galaxies: evidence for low metallicities
J. P. U. Fynbo, P. Jakobsson, P. Moller +11
We report on the results of a search for Ly-alpha emission from the host galaxy of the z=2.140 GRB 011211 and other galaxies in its surrounding field. We detect Ly-alpha emission f…