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arXiv · 0808.4040

The hidden HI-massive LIRG HIZOA J0836-43: Inside-out galaxy formation

M. E. Cluver·T. H. Jarrett·P. N. Appleton·R. C. Kraan-Korteweg·P. A. Woudt·B. S. Koribalski·J. L. Donley·K. Wakamatsu·T. Nagayama
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Abstract

HIZOA J0836-43 is an extreme gas-rich ($M_{\rm{HI}}$=7.5$\times10^{10} M_{\sun}$) disk galaxy which lies hidden behind the strongly obscuring Vela region of the Milky Way. Utilizing observations from the {\it Spitzer Space Telescope}, we have found it to be a luminous infrared starburst galaxy with a star formation rate of $\sim 21 M_{\sun} \rm{yr^{-1}}$, arising from exceptionally strong molecular PAH emission ($L_{7.7\micron} = 1.50 \times 10^{9} L_{\odot}$) and far-infrared emission from cold dust. The galaxy exhibits a weak mid-infrared continuum compared to other starforming 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 {\sc v}$]$ or $[$O {\sc 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($\pm$1.4)$\times10^{10} M_{\sun}$. With its plentiful gas supply and current star formation rate, a doubling of stellar mass would occur on a timescale of $\sim$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.

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M. E. Cluver, T. H. Jarrett, P. N. Appleton, R. C. Kraan-Korteweg, P. A. Woudt, B. S. Koribalski, J. L. Donley, K. Wakamatsu, T. Nagayama. 2008-08-29. The hidden HI-massive LIRG HIZOA J0836-43: Inside-out galaxy formation. https://doi.org/10.1086/592784

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