Spatially-resolved dust properties of the GRB 980425 host galaxy

Michał J. Michałowski; L. K. Hunt; E. Palazzi; S. Savaglio; G. Gentile; J. Rasmussen; M. Baes; S. Basa; S. Bianchi; S. Berta; D. Burlon; J. M. Castro Ceron; S. Covino; J. -G. Cuby; V. D'Elia; P. Ferrero; D. Gotz; J. Hjorth; M. P. Koprowski; D. Le Borgne; E. Le Floc'h; D. Malesani; T. Murphy; E. Pian; S. Piranomonte; J. Sollerman; N. R. Tanvir; A. de Ugarte Postigo; D. Watson; P. van der Werf; S. D. Vergani; D. Xu

doi:10.1051/0004-6361/201322843

Spatially-resolved dust properties of the GRB 980425 host galaxy

Michał J. Michałowski, L. K. Hunt, E. Palazzi, S. Savaglio, G. Gentile, J. Rasmussen, M. Baes, S. Basa, S. Bianchi, S. Berta, D. Burlon, J. M. Castro Ceron, S. Covino, J. -G. Cuby, V. D'Elia, P. Ferrero, D. Gotz, J. Hjorth, M. P. Koprowski, D. Le BorgneE. Le Floc'h, D. Malesani, T. Murphy, E. Pian, S. Piranomonte, J. Sollerman, N. R. Tanvir, A. de Ugarte Postigo, D. Watson, P. van der Werf, S. D. Vergani, D. Xu

School of Creative Arts

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Abstract

Gamma-ray bursts (GRBs) have been proposed as a tool for studying star formation in the Universe, so it is crucial to investigate whether their host galaxies and immediate environments are in any way special compared with other star-forming galaxies. Here we present spatially resolved maps of dust emission of the host galaxy of the closest known GRB 980425 at z=0.0085 using our new high-resolution observations from Herschel, Atacama Pathfinder Experiment (APEX), Atacama Large Millimeter Array (ALMA) and Australia Telescope Compact Array (ATCA). We modelled the spectral energy distributions of the host and of the star-forming region displaying the Wolf-Rayet signatures in the spectrum (WR region), located 800 pc from the GRB position. The host is characterised by low dust content and a high fraction of UV-visible star formation, similar to other dwarf galaxies. These galaxies are abundant in the local universe, so it is not surprising to find a GRB in one of them, assuming the correspondence between the GRB rate and star formation. The WR region contributes substantially to the host emission at the far-infrared, millimetre, and radio wavelengths and we propose that this is a consequence of its high gas density. If dense environments are also found close to the positions of other GRBs, then the ISM density should also be considered, along with metallicity, an important factor influencing whether a given stellar population can produce a GRB.

Original language	English
Article number	A70
Number of pages	13
Journal	Astronomy and Astrophysics
Volume	562
DOIs	https://doi.org/10.1051/0004-6361/201322843
Publication status	Published - 6 Feb 2014

Keywords

astro-ph.CO
astro-ph.HE

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Michałowski, M. J., Hunt, L. K., Palazzi, E., Savaglio, S., Gentile, G., Rasmussen, J., Baes, M., Basa, S., Bianchi, S., Berta, S., Burlon, D., Ceron, J. M. C., Covino, S., Cuby, J. .-G., D'Elia, V., Ferrero, P., Gotz, D., Hjorth, J., Koprowski, M. P., ... Xu, D. (2014). Spatially-resolved dust properties of the GRB 980425 host galaxy. Astronomy and Astrophysics, 562, Article A70. https://doi.org/10.1051/0004-6361/201322843

@article{16fc91d18dc244ec8272cfaa3aa3d424,

title = "Spatially-resolved dust properties of the GRB 980425 host galaxy",

abstract = "Gamma-ray bursts (GRBs) have been proposed as a tool for studying star formation in the Universe, so it is crucial to investigate whether their host galaxies and immediate environments are in any way special compared with other star-forming galaxies. Here we present spatially resolved maps of dust emission of the host galaxy of the closest known GRB 980425 at z=0.0085 using our new high-resolution observations from Herschel, Atacama Pathfinder Experiment (APEX), Atacama Large Millimeter Array (ALMA) and Australia Telescope Compact Array (ATCA). We modelled the spectral energy distributions of the host and of the star-forming region displaying the Wolf-Rayet signatures in the spectrum (WR region), located 800 pc from the GRB position. The host is characterised by low dust content and a high fraction of UV-visible star formation, similar to other dwarf galaxies. These galaxies are abundant in the local universe, so it is not surprising to find a GRB in one of them, assuming the correspondence between the GRB rate and star formation. The WR region contributes substantially to the host emission at the far-infrared, millimetre, and radio wavelengths and we propose that this is a consequence of its high gas density. If dense environments are also found close to the positions of other GRBs, then the ISM density should also be considered, along with metallicity, an important factor influencing whether a given stellar population can produce a GRB.",

keywords = "astro-ph.CO, astro-ph.HE",

author = "Micha{\l}owski, {Micha{\l} J.} and Hunt, {L. K.} and E. Palazzi and S. Savaglio and G. Gentile and J. Rasmussen and M. Baes and S. Basa and S. Bianchi and S. Berta and D. Burlon and Ceron, {J. M. Castro} and S. Covino and Cuby, {J. -G.} and V. D'Elia and P. Ferrero and D. Gotz and J. Hjorth and Koprowski, {M. P.} and Borgne, {D. Le} and Floc'h, {E. Le} and D. Malesani and T. Murphy and E. Pian and S. Piranomonte and J. Sollerman and Tanvir, {N. R.} and Postigo, {A. de Ugarte} and D. Watson and Werf, {P. van der} and Vergani, {S. D.} and D. Xu",

note = "Reproduced with permission from Astronomy & Astrophysics, {\textcopyright} ESO 2014.",

year = "2014",

month = feb,

day = "6",

doi = "10.1051/0004-6361/201322843",

language = "English",

volume = "562",

journal = "Astronomy and Astrophysics",

issn = "1432-0746",

publisher = "EDP Sciences",

}

Michałowski, MJ, Hunt, LK, Palazzi, E, Savaglio, S, Gentile, G, Rasmussen, J, Baes, M, Basa, S, Bianchi, S, Berta, S, Burlon, D, Ceron, JMC, Covino, S, Cuby, J-G, D'Elia, V, Ferrero, P, Gotz, D, Hjorth, J, Koprowski, MP, Borgne, DL, Floc'h, EL, Malesani, D, Murphy, T, Pian, E, Piranomonte, S, Sollerman, J, Tanvir, NR, Postigo, ADU, Watson, D, Werf, PVD, Vergani, SD & Xu, D 2014, 'Spatially-resolved dust properties of the GRB 980425 host galaxy', Astronomy and Astrophysics, vol. 562, A70. https://doi.org/10.1051/0004-6361/201322843

TY - JOUR

T1 - Spatially-resolved dust properties of the GRB 980425 host galaxy

AU - Michałowski, Michał J.

AU - Hunt, L. K.

AU - Palazzi, E.

AU - Savaglio, S.

AU - Gentile, G.

AU - Rasmussen, J.

AU - Baes, M.

AU - Basa, S.

AU - Bianchi, S.

AU - Berta, S.

AU - Burlon, D.

AU - Ceron, J. M. Castro

AU - Covino, S.

AU - Cuby, J. -G.

AU - D'Elia, V.

AU - Ferrero, P.

AU - Gotz, D.

AU - Hjorth, J.

AU - Koprowski, M. P.

AU - Borgne, D. Le

AU - Floc'h, E. Le

AU - Malesani, D.

AU - Murphy, T.

AU - Pian, E.

AU - Piranomonte, S.

AU - Sollerman, J.

AU - Tanvir, N. R.

AU - Postigo, A. de Ugarte

AU - Watson, D.

AU - Werf, P. van der

AU - Vergani, S. D.

AU - Xu, D.

PY - 2014/2/6

Y1 - 2014/2/6

N2 - Gamma-ray bursts (GRBs) have been proposed as a tool for studying star formation in the Universe, so it is crucial to investigate whether their host galaxies and immediate environments are in any way special compared with other star-forming galaxies. Here we present spatially resolved maps of dust emission of the host galaxy of the closest known GRB 980425 at z=0.0085 using our new high-resolution observations from Herschel, Atacama Pathfinder Experiment (APEX), Atacama Large Millimeter Array (ALMA) and Australia Telescope Compact Array (ATCA). We modelled the spectral energy distributions of the host and of the star-forming region displaying the Wolf-Rayet signatures in the spectrum (WR region), located 800 pc from the GRB position. The host is characterised by low dust content and a high fraction of UV-visible star formation, similar to other dwarf galaxies. These galaxies are abundant in the local universe, so it is not surprising to find a GRB in one of them, assuming the correspondence between the GRB rate and star formation. The WR region contributes substantially to the host emission at the far-infrared, millimetre, and radio wavelengths and we propose that this is a consequence of its high gas density. If dense environments are also found close to the positions of other GRBs, then the ISM density should also be considered, along with metallicity, an important factor influencing whether a given stellar population can produce a GRB.

AB - Gamma-ray bursts (GRBs) have been proposed as a tool for studying star formation in the Universe, so it is crucial to investigate whether their host galaxies and immediate environments are in any way special compared with other star-forming galaxies. Here we present spatially resolved maps of dust emission of the host galaxy of the closest known GRB 980425 at z=0.0085 using our new high-resolution observations from Herschel, Atacama Pathfinder Experiment (APEX), Atacama Large Millimeter Array (ALMA) and Australia Telescope Compact Array (ATCA). We modelled the spectral energy distributions of the host and of the star-forming region displaying the Wolf-Rayet signatures in the spectrum (WR region), located 800 pc from the GRB position. The host is characterised by low dust content and a high fraction of UV-visible star formation, similar to other dwarf galaxies. These galaxies are abundant in the local universe, so it is not surprising to find a GRB in one of them, assuming the correspondence between the GRB rate and star formation. The WR region contributes substantially to the host emission at the far-infrared, millimetre, and radio wavelengths and we propose that this is a consequence of its high gas density. If dense environments are also found close to the positions of other GRBs, then the ISM density should also be considered, along with metallicity, an important factor influencing whether a given stellar population can produce a GRB.

KW - astro-ph.CO

KW - astro-ph.HE

U2 - 10.1051/0004-6361/201322843

DO - 10.1051/0004-6361/201322843

M3 - Article

SN - 1432-0746

VL - 562

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A70

ER -

Spatially-resolved dust properties of the GRB 980425 host galaxy

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