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

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

2008-08-29

arxiv.org/abs/0808.4040v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, 1 table; Accepted for publication in ApJL: August 25 2008. A version with full resolution figures is avail

Scientific paper

10.1086/592784

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.

Affiliated with

Also associated with

No associations

Rating

The hidden HI-massive LIRG HIZOA J0836-43: Inside-out galaxy formation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The hidden HI-massive LIRG HIZOA J0836-43: Inside-out galaxy formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The hidden HI-massive LIRG HIZOA J0836-43: Inside-out galaxy formation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-542460