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Detection Of H I In Emission In The LY Alpha Emitting Galaxy Haro 11
Univ Wisconsin, Dept Astron, 475 North Charter St, Madison, WI 53706 USA..
Macalester Coll, Dept Phys & Astron, 1600 Grand Ave, St Paul, MN 55105 USA..
Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden..
Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden..
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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
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-312046DOI: 10.3847/0004-6256/152/6/178ISI: 000389327100007OAI: oai:DiVA.org:uu-312046DiVA: diva2:1062362
Swedish Research CouncilSwedish National Space Board
Available from: 2017-01-05 Created: 2017-01-04 Last updated: 2017-01-05Bibliographically approved

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