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Gamma-ray bursts from dusty regions with little molecular gas

Published online by Cambridge University Press:  27 October 2016

Bunyo Hatsukade ,
Kouji Ohta ,
Akira Endo ,
Kouichiro Nakanishi ,
Yoichi Tamura ,
Tetsuya Hashimoto  and
Kotaro Kohno
Bunyo Hatsukade
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan email: bunyo.hatsukade@nao.ac.jp
Kouji Ohta
Affiliation:
Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
Akira Endo
Affiliation:
Kavli Institute of NanoScience, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Kouichiro Nakanishi
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan email: bunyo.hatsukade@nao.ac.jp Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago 763 0355, Chile The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Yoichi Tamura
Affiliation:
Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
Tetsuya Hashimoto
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan email: bunyo.hatsukade@nao.ac.jp
Kotaro Kohno
Affiliation:
Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan Research Center for the Early Universe, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
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Abstract

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We detected CO line and 1.2-mm continuum emission from the two GRB host galaxies (GRB 020819B and GRB 051022) by using the Atacama Large Millimeter/submillimeter Array (ALMA). This is the first case for detecting molecular gas emission in GRB hosts. The ratio of molecular gas to dust mass of the GRB 020819B site is significantly lower than those of the Milky Way and nearby star-forming galaxies, suggesting that the star-forming environment where the GRB occur is different from those in local galaxies. The possible reason is that much of the dense gas is dissipated by a strong interstellar ultraviolet radiation field.

Keywords

gamma rays: burstsgalaxies: ISMradio continuum: galaxiesradio lines: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 274 - 275
Copyright
Copyright © International Astronomical Union 2016 

References

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