GRB 070125: The first long-duration gamma-ray burst in a halo environment

S. Bradley Cenko, Derek B. Fox, Brian E. Penprase, Antonio Cucchiara, Paul A. Price, Edo Berger, Shri R. Kulkarni, Fiona A. Harrison, Avishay Gal-Yam, Eran O. Ofek, Arne Rau, Poonam Chandra, Dale A. Frail, Mansi M. Kasliwal, Brian P. Schmidt, Alicia M. Soderberg, P. Brian Cameron, Kathy C. Roth

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

We present the discovery and high signal-to-noise ratio spectroscopic observations of the optical afterglow of the long-duration gamma-ray burst GRB 070125. Unlike all previously observed long-duration afterglows in the redshift range 0.5 ≲ z ≲ 2.0, we find no strong (rest-frame equivalent width Wr ≳ 1.0 Å) absorption features in the wavelength range 4000-10000 Å. The sole significant feature is a weak doublet that we identify as Mg II λλ2796 (Wr = 0.18 ± 0.02 Å), 2803 (Wr. = 0.08 ± 0.01 Å) at z = 1.5477 ± 0.0001. The low observed Mg II and inferred H I column densities are typically observed in galactic halos, far away from the bulk of massive star formation. Deep ground-based imaging reveals no host directly underneath the afterglow to a limit of R > 25.4 mag. Either of the two nearest blue galaxies could host GRB 070125; the large offset (d > 27 kpc) would naturally explain the low column densities. To remain consistent with the large local (i.e., parsec scale) circumburst density inferred from broadband afterglow observations, we speculate that GRB 070125 may have occurred far away from the disk of its host in a compact star-forming cluster. Such distant stellar clusters, typically formed by dynamical galaxy interactions, have been observed in the nearby universe and should be more prevalent at z > 1, where galaxy mergers occur more frequently.

Original languageEnglish (US)
Pages (from-to)441-447
Number of pages7
JournalAstrophysical Journal
Volume677
Issue number1
DOIs
StatePublished - Apr 10 2008

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afterglows
gamma ray bursts
halos
galaxies
interacting galaxies
signal-to-noise ratio
merger
galactic halos
massive stars
wavelength
star formation
signal to noise ratios
universe
broadband
stars
wavelengths

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Cenko, S. B., Fox, D. B., Penprase, B. E., Cucchiara, A., Price, P. A., Berger, E., ... Roth, K. C. (2008). GRB 070125: The first long-duration gamma-ray burst in a halo environment. Astrophysical Journal, 677(1), 441-447. https://doi.org/10.1086/526491
Cenko, S. Bradley ; Fox, Derek B. ; Penprase, Brian E. ; Cucchiara, Antonio ; Price, Paul A. ; Berger, Edo ; Kulkarni, Shri R. ; Harrison, Fiona A. ; Gal-Yam, Avishay ; Ofek, Eran O. ; Rau, Arne ; Chandra, Poonam ; Frail, Dale A. ; Kasliwal, Mansi M. ; Schmidt, Brian P. ; Soderberg, Alicia M. ; Cameron, P. Brian ; Roth, Kathy C. / GRB 070125 : The first long-duration gamma-ray burst in a halo environment. In: Astrophysical Journal. 2008 ; Vol. 677, No. 1. pp. 441-447.
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Cenko, SB, Fox, DB, Penprase, BE, Cucchiara, A, Price, PA, Berger, E, Kulkarni, SR, Harrison, FA, Gal-Yam, A, Ofek, EO, Rau, A, Chandra, P, Frail, DA, Kasliwal, MM, Schmidt, BP, Soderberg, AM, Cameron, PB & Roth, KC 2008, 'GRB 070125: The first long-duration gamma-ray burst in a halo environment', Astrophysical Journal, vol. 677, no. 1, pp. 441-447. https://doi.org/10.1086/526491

GRB 070125 : The first long-duration gamma-ray burst in a halo environment. / Cenko, S. Bradley; Fox, Derek B.; Penprase, Brian E.; Cucchiara, Antonio; Price, Paul A.; Berger, Edo; Kulkarni, Shri R.; Harrison, Fiona A.; Gal-Yam, Avishay; Ofek, Eran O.; Rau, Arne; Chandra, Poonam; Frail, Dale A.; Kasliwal, Mansi M.; Schmidt, Brian P.; Soderberg, Alicia M.; Cameron, P. Brian; Roth, Kathy C.

In: Astrophysical Journal, Vol. 677, No. 1, 10.04.2008, p. 441-447.

Research output: Contribution to journalArticle

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AU - Cenko, S. Bradley

AU - Fox, Derek B.

AU - Penprase, Brian E.

AU - Cucchiara, Antonio

AU - Price, Paul A.

AU - Berger, Edo

AU - Kulkarni, Shri R.

AU - Harrison, Fiona A.

AU - Gal-Yam, Avishay

AU - Ofek, Eran O.

AU - Rau, Arne

AU - Chandra, Poonam

AU - Frail, Dale A.

AU - Kasliwal, Mansi M.

AU - Schmidt, Brian P.

AU - Soderberg, Alicia M.

AU - Cameron, P. Brian

AU - Roth, Kathy C.

PY - 2008/4/10

Y1 - 2008/4/10

N2 - We present the discovery and high signal-to-noise ratio spectroscopic observations of the optical afterglow of the long-duration gamma-ray burst GRB 070125. Unlike all previously observed long-duration afterglows in the redshift range 0.5 ≲ z ≲ 2.0, we find no strong (rest-frame equivalent width Wr ≳ 1.0 Å) absorption features in the wavelength range 4000-10000 Å. The sole significant feature is a weak doublet that we identify as Mg II λλ2796 (Wr = 0.18 ± 0.02 Å), 2803 (Wr. = 0.08 ± 0.01 Å) at z = 1.5477 ± 0.0001. The low observed Mg II and inferred H I column densities are typically observed in galactic halos, far away from the bulk of massive star formation. Deep ground-based imaging reveals no host directly underneath the afterglow to a limit of R > 25.4 mag. Either of the two nearest blue galaxies could host GRB 070125; the large offset (d > 27 kpc) would naturally explain the low column densities. To remain consistent with the large local (i.e., parsec scale) circumburst density inferred from broadband afterglow observations, we speculate that GRB 070125 may have occurred far away from the disk of its host in a compact star-forming cluster. Such distant stellar clusters, typically formed by dynamical galaxy interactions, have been observed in the nearby universe and should be more prevalent at z > 1, where galaxy mergers occur more frequently.

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Cenko SB, Fox DB, Penprase BE, Cucchiara A, Price PA, Berger E et al. GRB 070125: The first long-duration gamma-ray burst in a halo environment. Astrophysical Journal. 2008 Apr 10;677(1):441-447. https://doi.org/10.1086/526491