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HST STIS Observations of the Central Radio/X-Ray Source in the Compact Starburst Galaxy Henize 2-10

Published online by Cambridge University Press:  30 October 2019

Eric Rohr Open the ORCID record for Eric Rohr [Opens in a new window] ,
Mark Whittle ,
Amy Reines  and
Kelsey Johnson
Eric Rohr
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA
Mark Whittle
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA
Amy Reines
Affiliation:
Department of Physics, Montana State University, Bozeman, MT 59717, USA
Kelsey Johnson
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA
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Abstract

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Based on radio and X-ray observations, it has been suggested that a black hole of mass ∼106 Mʘ resides in the dwarf starburst galaxy Henize 2-10. This unusual finding has important implications for the formation of massive black holes in the early universe since Henize 2-10 can be viewed as a low redshift analog to the first high-z galaxies. We present long-slit HST STIS spectra that include the central radio/X-ray source. While recent VLT-MUSE spectroscopic observations with 0″.7 seeing show no change in ionization near the central source, our higher spatial resolution STIS observations identify a distinct compact region at the location of the radio/X-ray source. Initial analysis reveals broader (FWHM ∼ 380 km s-1) blue-shifted lines of low ionization. Our analysis focuses on testing two scenarios: a LINER-like AGN and a young (few decades) SNR.

Keywords

galaxies: dwarfgalaxies: starburstgalaxies: individual (Henize 2-10)
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. 404 - 407
Copyright
© International Astronomical Union 2019 

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