Host Galaxy Properties of the Subluminous GRB 120422A/SN 2012bz

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Host Galaxy Properties of the Subluminous GRB 120422A/SN 2012bz

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Title: Host Galaxy Properties of the Subluminous GRB 120422A/SN 2012bz
Author: Levesque, Emily M.; Chornock, Ryan; Soderberg, Alicia M.; Berger, Edo; Lunnan, Ragnhild

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Citation: Levesque, Emily M., Ryan Chornock, Alicia M. Soderberg, Edo Berger, and Ragnhild Lunnan. 2012. Host Galaxy Properties of the Subluminous GRB 120422A/SN 2012bz. The Astrophysical Journal 758, no. 2: 92. doi:10.1088/0004-637x/758/2/92.
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Abstract: GRB 120422A is a nearby (z = 0.283) long-duration GRB (LGRB) detected by Swift with Eγ,iso ∼ 4.5 × 1049 erg. It is also associated with the spectroscopically-confirmed broad-lined Type Ic SN 2012bz. These properties establish GRB 120422A/SN 2012bz as the sixth and newest member of the class of subluminous GRB/SNe. Observations also show that GRB 120422A/SN 2012bz occurred at an unusually large offset (∼8 kpc) from the host galaxy nucleus, setting it apart from other nearby LGRBs and leading to speculation that the host environment may have undergone prior interaction activity. Here we present spectroscopic observations using the 6.5m Magellan telescope at Las Campanas. We extract spectra at three specific locations within the GRB/SN host galaxy, including the host nucleus, the explosion site, and the “bridge” of diffuse emission connecting these two regions. We measure a metallicity of log(O/H) + 12 = 8.3 ± 0.1 and a star formation rate per unit area of 0.08 M⊙ yr−1 kpc−2 at the host nucleus. At the GRB/SN explosion site we measure a comparable metallicity of log(O/H) + 12 = 8.2 ± 0.1, but find a much lower star formation rate per unit area of 0.01 M⊙ yr−1 kpc−2. We also compare the host galaxy of this event to the hosts of other LGRBs, including samples of subluminous LGRBs and cosmological LGRBs, and find no systematic metallicity difference between the environments of these different subtypes.
Published Version: doi:10.1088/0004-637x/758/2/92
Other Sources: https://arxiv.org/pdf/1207.4200.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:30410850
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