Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705

We present Very Large Telescope spectroscopic observations of the GRB 990705 host galaxy and highlight the benefits provided by the prompt phase features of gamma-ray bursts (GRBs) to derive the redshifts of the latter. In the host spectrum, we indeed detect an emission feature that we attribute to...

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Detalles Bibliográficos
Publicado: 2002
Materias:
Galaxies: individual (GRB 990705 host)
Galaxies: spiral
Galaxies: starburst
Gamma rays: bursts
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v581_n2II_pL81_LeFloch
http://hdl.handle.net/20.500.12110/paper_0004637X_v581_n2II_pL81_LeFloch
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004637X_v581_n2II_pL81_LeFloch
record_format dspace
spelling paper:paper_0004637X_v581_n2II_pL81_LeFloch2023-06-08T14:28:46Z Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705 Galaxies: individual (GRB 990705 host) Galaxies: spiral Galaxies: starburst Gamma rays: bursts We present Very Large Telescope spectroscopic observations of the GRB 990705 host galaxy and highlight the benefits provided by the prompt phase features of gamma-ray bursts (GRBs) to derive the redshifts of the latter. In the host spectrum, we indeed detect an emission feature that we attribute to the [O II] λλ3726, 3729 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 GRB 990705. 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 interstellar absorption lines in the GRB afterglows. Deep and high-resolution images of the host of GRB 990705 with the Space Telescope Imaging Spectrograph camera on board the Hubble Space Telescope reveal that the burst occurred in a nearly face-on Sc spiral galaxy typical of disk-dominated systems at 0.75 ≤ z ≤ 1. Assuming a cosmology with H0 = 65 km s-1 Mpc-1, Ωm = 0.3, and Ωλ = 0.7, we derive an absolute B magnitude M B = -21.75 for this galaxy and a star formation rate SFR ≈ 5-8 M⊙ yr-1. Finally, we discuss the implications of using X-ray transient features to derive GRB redshifts with larger burst samples and especially examine the case of short and dark long GRBs. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v581_n2II_pL81_LeFloch http://hdl.handle.net/20.500.12110/paper_0004637X_v581_n2II_pL81_LeFloch
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Galaxies: individual (GRB 990705 host)
Galaxies: spiral
Galaxies: starburst
Gamma rays: bursts
spellingShingle Galaxies: individual (GRB 990705 host)
Galaxies: spiral
Galaxies: starburst
Gamma rays: bursts
Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705
topic_facet Galaxies: individual (GRB 990705 host)
Galaxies: spiral
Galaxies: starburst
Gamma rays: bursts
description We present Very Large Telescope spectroscopic observations of the GRB 990705 host galaxy and highlight the benefits provided by the prompt phase features of gamma-ray bursts (GRBs) to derive the redshifts of the latter. In the host spectrum, we indeed detect an emission feature that we attribute to the [O II] λλ3726, 3729 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 GRB 990705. 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 interstellar absorption lines in the GRB afterglows. Deep and high-resolution images of the host of GRB 990705 with the Space Telescope Imaging Spectrograph camera on board the Hubble Space Telescope reveal that the burst occurred in a nearly face-on Sc spiral galaxy typical of disk-dominated systems at 0.75 ≤ z ≤ 1. Assuming a cosmology with H0 = 65 km s-1 Mpc-1, Ωm = 0.3, and Ωλ = 0.7, we derive an absolute B magnitude M B = -21.75 for this galaxy and a star formation rate SFR ≈ 5-8 M⊙ yr-1. Finally, we discuss the implications of using X-ray transient features to derive GRB redshifts with larger burst samples and especially examine the case of short and dark long GRBs.
title Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705
title_short Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705
title_full Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705
title_fullStr Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705
title_full_unstemmed Very large telescope and Hubble Space Telescope observations of the host galaxy of GRB 990705
title_sort very large telescope and hubble space telescope observations of the host galaxy of grb 990705
publishDate 2002
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v581_n2II_pL81_LeFloch
http://hdl.handle.net/20.500.12110/paper_0004637X_v581_n2II_pL81_LeFloch
_version_ 1768542437013192704

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