Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-03-28
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
5 pages, 2 figures. Accepted for publication in ApJL
Scientific paper
The feedback from galactic outflows is thought to play an important role in shaping the gas content, star formation history, and ultimately the stellar mass function of galaxies. Here we present evidence for massive molecular outflows associated with ultra-luminous infrared galaxies (ULIRGs) in the coadded Redshift Search Receiver 12CO(1-0) spectrum. Our stacked spectrum of 27 ULIRGs at z = 0.043-0.11 (freq_rest = 110-120 GHz) shows broad wings around the CO line with delta_V(FWZI)~2000 km/s. Its integrated line flux accounts for up to 25+/-5% of the total CO line luminosity. When interpreted as a massive molecular outflow wind, the associated mechanical energy can be explained by a concentrated starburst with SFR \geq 100 M_sun/yr, which agrees well with their SFR derived from the FIR luminosity. Using the high signal-to-noise stacked composite spectrum, we also probe 13CO and 12CN emission in the sample and discuss how the chemical abundance of molecular gas may vary depending on the physical conditions of the nuclear region.
Chung Aeree
Erickson Neal R.
Heyer Mark
Naraynan Gopal
Yun Min. S.
No associations
LandOfFree
Evidence for 1000 km/s Molecular Outflows in the Local ULIRG Population 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 Evidence for 1000 km/s Molecular Outflows in the Local ULIRG Population, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for 1000 km/s Molecular Outflows in the Local ULIRG Population will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-162380