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Detection Of H I In...
Detection Of H I In Emission In The LY Alpha Emitting Galaxy Haro 11
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- Pardy, Stephen A. (författare)
- Univ Wisconsin, Dept Astron, 475 North Charter St, Madison, WI 53706 USA.
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- Cannon, John M. (författare)
- Macalester Coll, Dept Phys & Astron, 1600 Grand Ave, St Paul, MN 55105 USA.
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- Östlin, Göran (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Hayes, Matthew (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Bergvall, Nils (författare)
- Uppsala universitet,Observationell astrofysik
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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. (creator_code:org_t)
- 2016-11-22
- 2016
- Engelska.
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Ingår i: Astronomical Journal. - : American Astronomical Society. - 0004-6256 .- 1538-3881. ; 152:6
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- galaxies: ISM
- galaxies: kinematics and dynamics
- galaxies: starburst
- radio lines: galaxies
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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