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Far-infrared observations of an unbiased sample of gamma-ray burst host galaxies

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Abstract
Gamma-ray bursts (GRBs) are the most energetic phenomena in the Universe; believed to result from the collapse and subsequent explosion of massive stars. Even though it has profound consequences for our understanding of their nature and selection biases, little is known about the dust properties of the galaxies hosting GRBs. We present analysis of the far-infrared properties of an unbiased sample of 20 BeppoSAX and Swift GRB host galaxies (at an average redshift of z = 3.1) located in the Herschel Astrophysical Terahertz Large Area Survey, the Herschel Virgo Cluster Survey, the Herschel Fornax Cluster Survey, the Herschel Stripe 82 Survey and the Herschel Multi-tiered Extragalactic Survey, totalling 880 deg(2), or similar to 3 per cent of the sky in total. Our sample selection is serendipitous, based only on whether the Xray position of a GRB lies within a large-scale Herschel survey - therefore our sample can be considered completely unbiased. Using deep data at wavelengths of 100-500 mu m, we tentatively detected 1 out of 20 GRB hosts located in these fields. We constrain their dust masses and star formation rates (SFRs), and discuss these in the context of recent measurements of submillimetre galaxies and ultraluminous infrared galaxies. The average far-infrared flux of our sample gives an upper limit on SFR of <114 M-circle dot yr(-1). The detection rate of GRB hosts is consistent with that predicted assuming that GRBs trace the cosmic SFR density in an unbiased way, i.e. that the fraction of GRB hosts with SFR >500 M-circle dot yr(-1) is consistent with the contribution of such luminous galaxies to the cosmic star formation density.
Keywords
extinction, dust, galaxies: high-redshift, galaxies: star formation, infrared: galaxies, STAR-FORMATION RATE, SCIENCE DEMONSTRATION PHASE, HERSCHEL VIRGO CLUSTER, SPECTRAL ENERGY-DISTRIBUTIONS, DIGITAL SKY SURVEY, SUBMILLIMETER GALAXIES, EXTRAGALACTIC SURVEY, FORMING GALAXIES, HIGH-REDSHIFT, LUMINOSITY FUNCTION, gamma-ray burst: general

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Citation

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Chicago
Kohn, SA, MJ Michalowski, N Bourne, Maarten Baes, Jacopo Fritz, A Cooray, Ilse De Looze, et al. 2015. “Far-infrared Observations of an Unbiased Sample of Gamma-ray Burst Host Galaxies.” Monthly Notices of the Royal Astronomical Society 448 (2): 1494–1503.
APA
Kohn, S., Michalowski, M., Bourne, N., Baes, M., Fritz, J., Cooray, A., De Looze, I., et al. (2015). Far-infrared observations of an unbiased sample of gamma-ray burst host galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 448(2), 1494–1503.
Vancouver
1.
Kohn S, Michalowski M, Bourne N, Baes M, Fritz J, Cooray A, et al. Far-infrared observations of an unbiased sample of gamma-ray burst host galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2015;448(2):1494–503.
MLA
Kohn, SA, MJ Michalowski, N Bourne, et al. “Far-infrared Observations of an Unbiased Sample of Gamma-ray Burst Host Galaxies.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 448.2 (2015): 1494–1503. Print.
@article{7058692,
  abstract     = {Gamma-ray bursts (GRBs) are the most energetic phenomena in the Universe; believed to result from the collapse and subsequent explosion of massive stars. Even though it has profound consequences for our understanding of their nature and selection biases, little is known about the dust properties of the galaxies hosting GRBs. We present analysis of the far-infrared properties of an unbiased sample of 20 BeppoSAX and Swift GRB host galaxies (at an average redshift of z = 3.1) located in the Herschel Astrophysical Terahertz Large Area Survey, the Herschel Virgo Cluster Survey, the Herschel Fornax Cluster Survey, the Herschel Stripe 82 Survey and the Herschel Multi-tiered Extragalactic Survey, totalling 880 deg(2), or similar to 3 per cent of the sky in total. Our sample selection is serendipitous, based only on whether the Xray position of a GRB lies within a large-scale Herschel survey - therefore our sample can be considered completely unbiased. Using deep data at wavelengths of 100-500 mu m, we tentatively detected 1 out of 20 GRB hosts located in these fields. We constrain their dust masses and star formation rates (SFRs), and discuss these in the context of recent measurements of submillimetre galaxies and ultraluminous infrared galaxies. The average far-infrared flux of our sample gives an upper limit on SFR of {\textlangle}114 M-circle dot yr(-1). The detection rate of GRB hosts is consistent with that predicted assuming that GRBs trace the cosmic SFR density in an unbiased way, i.e. that the fraction of GRB hosts with SFR {\textrangle}500 M-circle dot yr(-1) is consistent with the contribution of such luminous galaxies to the cosmic star formation density.},
  author       = {Kohn, SA and Michalowski, MJ and Bourne, N and Baes, Maarten and Fritz, Jacopo and Cooray, A and De Looze, Ilse and De Zotti, G and Dannerbauer, H and Dunne, L and Dye, S and Eales, S and Furlanetto, C and Gonzalez-Nuevo, J and Ibar, E and Ivison, RJ and Maddox, SJ and Scott, D and Smith, DJB and Smith, MWL and Symeonidis, M and Valiante, E},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {extinction,dust,galaxies: high-redshift,galaxies: star formation,infrared: galaxies,STAR-FORMATION RATE,SCIENCE DEMONSTRATION PHASE,HERSCHEL VIRGO CLUSTER,SPECTRAL ENERGY-DISTRIBUTIONS,DIGITAL SKY SURVEY,SUBMILLIMETER GALAXIES,EXTRAGALACTIC SURVEY,FORMING GALAXIES,HIGH-REDSHIFT,LUMINOSITY FUNCTION,gamma-ray burst: general},
  language     = {eng},
  number       = {2},
  pages        = {1494--1503},
  title        = {Far-infrared observations of an unbiased sample of gamma-ray burst host galaxies},
  url          = {http://dx.doi.org/10.1093/mnras/stv088},
  volume       = {448},
  year         = {2015},
}

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