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DETECTION OF H i IN EMISSION IN THE LY EMITTING GALAXY HARO 11
Journal article   Peer reviewed

DETECTION OF H i IN EMISSION IN THE LY EMITTING GALAXY HARO 11

Stephen A. Pardy, John M. Cannon, Göran Östlin, Matthew Hayes and Nils Bergvall
The Astronomical journal, Vol.152(6), 178
11/22/2016
DOI: 10.3847/0004-6256/152/6/178
url
https://arxiv.org/pdf/1609.04020View
Open Access

Abstract

ABSTRACT 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 and the Lyman continuum. We detect (5.1 0.7 × 108) M 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.
 galaxies: ISM galaxies: kinematics and dynamics galaxies: starburst radio lines: galaxies

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