VLT and HST observations of the host galaxy of GRB990705 - INSPIRE

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VLT and HST observations of the host galaxy of GRB990705

Emeric Le Floc'h
(
- DAPNIA, Saclay
)
,
P.A. Duc
(
- DAPNIA, Saclay
)
,
I.F. Mirabel
(
- DAPNIA, Saclay and
- Buenos Aires, IAFE
)
,
D.B. Sanders
(
- Inst. Astron., Honolulu and
- Garching, Max Planck Inst., MPE
)
,
G. Bosh
(
- La Plata U.
)

Nov, 2002

5 pages

Published in:

Astrophys.J.Lett. 581 (2002) L81-L84

e-Print:

astro-ph/0211250 [astro-ph]

DOI:

10.1086/346072

View in:

ADS Abstract Service

reference search41 citations

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Abstract: (arXiv)

We present VLT spectroscopic observations of Gamma-Ray Burst (GRB) 990705 host galaxy and highlight the benefits provided by the prompt-phase features of GRBs to derive the redshifts of the latter. In the host spectrum, we indeed detect an emission feature which we attribute to the [OII] 3726/3729 Angstrom doublet and derive an unambiguous redshift z=0.8424+/-0.0002 for this galaxy. This is in full agreement with the value z~0.86+/-0.17 previously derived using a transient absorption edge discovered in the X-ray spectrum of GRB990705. This burst is therefore the first GRB for which a reliable redshift was derived from the prompt phase emission itself, as opposed to redshift determinations performed using putative host galaxy emission lines or intestellar absorption lines in the GRB afterglows. Deep and high resolution images of the host of GRB990705 with the HST/STIS camera reveal that the burst occured in a nearly face-on Sc spiral galaxy typical of disk-dominated systems at 0.75

GALAXIES SPIRAL
GALAXIES STARBURST

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Figures(0)

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