Evidence for 1000 km s -1 molecular outflows in the local ULIRG population

Aeree Chung, Min S. Yun, Gopal Naraynan, Mark Heyer, Neal R. Erickson

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

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 co-added Redshift Search Receiver 12 CO (1-0) spectrum. Our stacked spectrum of 27 ULIRGs at z = 0.043-0.11 (ν rest = 110-120 GHz) shows broad wings around the CO line with ΔV(FWZI) ≈ 2000 km s -1 . 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 star formation rate (SFR) ≥100 M yr -1 , which agrees well with their SFR derived from the FIR luminosity. Using the high signal-to-noise stacked composite spectrum, we also probe 13 CO and 12 CN emission in the sample and discuss how the chemical abundance of molecular gas may vary depending on the physical conditions of the nuclear region.

Original languageEnglish
Article numberL15
JournalAstrophysical Journal Letters
Volume732
Issue number1 PART II
DOIs
Publication statusPublished - 2011 May 1

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outflow
star formation rate
galaxies
CN emission
luminosity
molecular gases
stellar mass
gas
wings
star formation
receivers
probe
histories
composite materials
probes
history
gases
energy
rate
physical conditions

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Chung, Aeree ; Yun, Min S. ; Naraynan, Gopal ; Heyer, Mark ; Erickson, Neal R. / Evidence for 1000 km s -1 molecular outflows in the local ULIRG population In: Astrophysical Journal Letters. 2011 ; Vol. 732, No. 1 PART II.
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Evidence for 1000 km s -1 molecular outflows in the local ULIRG population . / Chung, Aeree; Yun, Min S.; Naraynan, Gopal; Heyer, Mark; Erickson, Neal R.

In: Astrophysical Journal Letters, Vol. 732, No. 1 PART II, L15, 01.05.2011.

Research output: Contribution to journalArticle

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