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Dwarf galaxies as hosts of stellar explosions: gas kinematics and abundances in 3D

Published online by Cambridge University Press:  30 October 2019

C. C. Thöne Open the ORCID record for C. C. Thöne [Opens in a new window] ,
L. Izzo ,
H. Flores ,
S. Vergani  and
L. Christensen Open the ORCID record for L. Christensen [Opens in a new window]
C. C. Thöne
Affiliation:
HETH/IAA-CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain email: [email protected]
L. Izzo
Affiliation:
HETH/IAA-CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain email: [email protected]
H. Flores
Affiliation:
GEPI, Observatoire de Paris, PSL Université, CNRS, 5 Place Jules Janssen, F-92190 Meudon, France Paris, France
S. Vergani
Affiliation:
GEPI, Observatoire de Paris, PSL Université, CNRS, 5 Place Jules Janssen, F-92190 Meudon, France Paris, France
L. Christensen
Affiliation:
DARK/NBI, Univ. of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
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Abstract

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The hosts of long Gamma-ray bursts (GRBs) are places of intense star-formation, which, at low redshift, are primarily low-mass dwarf starburst galaxies. Spatially resolved studies of these galaxies are still sparse, even more so at high spectral resolution where we can probe gas kinematics, in- and outflows and differences in abundance between different components. Here we present the first high resolution IFU sample of six low redshift GRB hosts, all dwarf starbursts. All galaxies in our sample show evidence for excess emission or broad emission components, with velocities of 100-200 km s−1. For GRB 030329, outflowing gas had also been observed in absorption in spectra of the GRB afterglow. The high velocity emission is usually blue shifted, connected to the brightest star-forming regions and more metal rich than the narrow component associated with the emission of the general host ISM. This gives strong indications that the excess emission/broad component is indeed associated to a starburst wind as observed in many field star-burst galaxies and a sign for the intense ongoing star-formation in those galaxies.

Keywords

galaxies: dwarfgalaxies: starburstgalaxies: kinematics and dynamicsgamma rays: bursts
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 224 - 227
Copyright
© International Astronomical Union 2019 

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