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DETECTION OF H I IN EMISSION IN THE LY alpha EMITTING GALAXY HARO 11
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 5
2016 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 152, no 6, 178Article in journal (Refereed) Published
Abstract [en]

We present the first robust detection of H I 21 cm emission in the blue compact galaxy Haro 11 using the 100 m Robert C. Byrd Green Bank Telescope (GBT). Haro 11 is a luminous blue compact galaxy with emission in both Ly alpha and the Lyman continuum. We detect (5.1 +/- 0.7 x 10(8)) M-circle dot of H I gas at an assumed distance of 88 Mpc, making this galaxy H I deficient compared to other local galaxies with similar optical properties. Given this small H I mass, Haro 11 has an elevated MH2/MH I ratio and a very low gas fraction compared to most local galaxies, and contains twice as much mass in ionized hydrogen as in neutral hydrogen. The H I emission has a linewidth of 71 km s(-1) and is offset 60 km s(-1) redward of the optical line center. It is undergoing a starburst after a recent merger that has elevated the star formation rate, and will deplete the gas supply in <0.2 Gyr. Although this starburst has elevated the star formation rate (SFR) compared to galaxies with similar H I masses and line widths, Haro 11 matches a trend of lower gas fractions toward higher SFRs and is below the general trend of increasing H I mass with increasing luminosity. Taken together, our results paint Haro 11 as a standard low-mass galaxy that is undergoing an unusually efficient star formation episode.

Place, publisher, year, edition, pages
2016. Vol. 152, no 6, 178
Keyword [en]
galaxies: ISM, galaxies: kinematics and dynamics, galaxies: starburst, radio lines: galaxies
National Category
Physical Sciences
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URN: urn:nbn:se:su:diva-137589DOI: 10.3847/0004-6256/152/6/178ISI: 000389327100007OAI: oai:DiVA.org:su-137589DiVA: diva2:1063197
Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-01-09Bibliographically approved

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