Molecular Gas Properties in the Host Galaxy of GRB 080207

Bunyo Hatsukade, Tetsuya Hashimoto, Kotaro Kohno, Kouichiro Nakanishi, Kouji Ohta, Yuu Niino, Yoichi Tamura, L. Tóth

Research output: Contribution to journalArticle

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Abstract

We present the results of CO(1-0) and CO(4-3) observations of the host galaxy of a long-duration gamma-ray burst GRB 080207 at z = 2.0858 by using the Karl G. Jansky Very Large Array and the Atacama Large Millimeter/submillimeter Array. The host is detected in CO(1-0) and CO(4-3), becoming the first case for a gamma-ray burst (GRB) host with more than two CO transitions detected combined with CO(2-1) and CO(3-2) in the literature. Adopting a metallicity-dependent CO-to-H2 conversion factor, we derive a molecular gas mass of M gas = 8.7 × 1010 M o, which places the host in a sequence of normal star-forming galaxies in an M gas-star formation rate (SFR) plane. A modified blackbody fit to the far-infrared-millimeter photometry results in a dust temperature of 37 K and a dust mass of M dust = 1.5 × 108 M o. The spatially resolved CO(4-3) observations allow us to examine the kinematics of the host. The CO velocity field shows a clear rotation and is reproduced by a rotation-dominated disk model with a rotation velocity of 350 km s-1 and a half-light radius of 2.4 kpc. The CO spectral line energy distribution derived from the four CO transitions is similar to that of starburst galaxies, suggesting a high excitation condition. Comparison of molecular gas properties between the host and normal (main-sequence) galaxies at similar redshifts shows that they share common properties such as gas mass fraction, gas depletion timescale, gas-to-dust ratio, location in the M gas-SFR (or surface density) relation, and kinematics, suggesting that long-duration GRBs can occur in normal star-forming environments at z ∼ 2.

Original languageEnglish
Article number91
JournalAstrophysical Journal
Volume876
Issue number2
DOIs
Publication statusPublished - May 10 2019

Fingerprint

molecular gases
gamma ray bursts
galaxies
dust
gases
gas
star formation rate
kinematics
stars
Very Large Array (VLA)
starburst galaxies
common property resource
metallicity
photometry
line spectra
energy distribution
depletion
velocity distribution
radii
timescale

Keywords

  • cosmology: observations
  • galaxies: high-redshift
  • galaxies: ISM
  • gamma-ray burst: individual (GRB 080207)
  • radio lines: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hatsukade, B., Hashimoto, T., Kohno, K., Nakanishi, K., Ohta, K., Niino, Y., ... Tóth, L. (2019). Molecular Gas Properties in the Host Galaxy of GRB 080207. Astrophysical Journal, 876(2), [91]. https://doi.org/10.3847/1538-4357/ab1649

Molecular Gas Properties in the Host Galaxy of GRB 080207. / Hatsukade, Bunyo; Hashimoto, Tetsuya; Kohno, Kotaro; Nakanishi, Kouichiro; Ohta, Kouji; Niino, Yuu; Tamura, Yoichi; Tóth, L.

In: Astrophysical Journal, Vol. 876, No. 2, 91, 10.05.2019.

Research output: Contribution to journalArticle

Hatsukade, B, Hashimoto, T, Kohno, K, Nakanishi, K, Ohta, K, Niino, Y, Tamura, Y & Tóth, L 2019, 'Molecular Gas Properties in the Host Galaxy of GRB 080207', Astrophysical Journal, vol. 876, no. 2, 91. https://doi.org/10.3847/1538-4357/ab1649
Hatsukade B, Hashimoto T, Kohno K, Nakanishi K, Ohta K, Niino Y et al. Molecular Gas Properties in the Host Galaxy of GRB 080207. Astrophysical Journal. 2019 May 10;876(2). 91. https://doi.org/10.3847/1538-4357/ab1649
Hatsukade, Bunyo ; Hashimoto, Tetsuya ; Kohno, Kotaro ; Nakanishi, Kouichiro ; Ohta, Kouji ; Niino, Yuu ; Tamura, Yoichi ; Tóth, L. / Molecular Gas Properties in the Host Galaxy of GRB 080207. In: Astrophysical Journal. 2019 ; Vol. 876, No. 2.
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