Cluver, M. E. and Jarrett, T. H. and Appleton, P. N. and Kraan-Korteweg, R. C. and Woudt, P. A. and Koribalski, B. S. and Donley, J. L. and Wakamatsu, K. and Nagayama, T. (2008) The Hidden H I-Massive Luminous Infrared Galaxy HIZOA J0836–43: Inside-Out Galaxy Formation. Astrophysical Journal Letters, 686 (1). L17-L20. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:CLUapjl08
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HIZOA J0836–43 is an extreme gas-rich (MH I = 7.5 × 10^10 M☉) disk galaxy which lies hidden behind the strongly obscuring Vela region of the Milky Way. Utilizing observations from the Spitzer Space Telescope, we have found it to be a luminous infrared starburst galaxy with a star formation rate of ~ 21 M☉ yr^−1, arising from exceptionally strong molecular PAH emission (L7.7μ m = 1.50 × 10^9 L☉) and far-infrared emission from cold dust. The galaxy exhibits a weak mid-infrared continuum compared to other star-forming galaxies and U/LIRGs. This relative lack of emission from small grains suggests atypical interstellar medium conditions compared to other starbursts. We do not detect significant [Ne V] or [O IV], which implies an absent or very weak AGN. The galaxy possesses a prominent bulge of evolved stars and a stellar mass of 4.4(±1.4) × 10^10 M☉. With its plentiful gas supply and current star formation rate, a doubling of stellar mass would occur on a timescale of ~2 Gyr. Compared to local galaxies, HIZOA J0836–43 appears to be a "scaled up" spiral undergoing inside-out formation, possibly resembling stellar disk building processes at intermediate redshifts.
|Additional Information:||© 2008. The American Astronomical Society. Received 2008 June 6; accepted 2008 August 25; published 2008 October 10. Print publication: Issue 1 (2008 October 10). We thank D. Dale and SINGS, J. Howell and GOALS for data access. We are grateful to S. Carey, G. Helou, S. Lord, J. Mazzarella, and B. Madore for insightful discussions. Support for this work was provided by NASA through an award issued by JPL/Caltech. M.C., R.K.K., and P.A.W. thank the NRF for financial support. M.C. thanks IPAC/Caltech for financial support through a Visiting Graduate Fellowship. This work is based on observations made with the Spitzer Space Telescope, which is operated by JPL/Caltech under a contract with NASA.|
|Subject Keywords:||galaxies: individual (HIZOA J0836-43); galaxies: starburst; infrared: galaxies|
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|Deposited By:||Archive Administrator|
|Deposited On:||15 Jan 2009 07:34|
|Last Modified:||14 Jan 2013 21:40|
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