Molecular gas properties of UV-luminous star-forming galaxies at low redshift

Abstract

Lyman break analogues (LBAs) are a population of star-forming galaxies at low redshift (z ~ 0.2) selected in the ultraviolet (UV). These objects present higher star formation rates and lower dust extinction than other galaxies with similar masses and luminosities in the local universe. In this work we present results from a survey with the Combined Array for Research in Millimetre-wave Astronomy (CARMA) to detect CO(1-0) emission in LBAs, in order to analyse the properties of the molecular gas in these galaxies. Our results show that LBAs follow the same Schmidt-Kennicutt law as local galaxies. On the other hand, they have higher gas fractions (up to 66%) and faster gas depletion time-scales (below 1 Gyr). These characteristics render these objects more akin to high-redshift star-forming galaxies. We conclude that LBAs are a great nearby laboratory for studying the cold interstellar medium in low-metallicity, UV-luminous compact star-forming galaxies.

13 pages, 8 figures; accepted for publication in MNRAS

References in corpus (10)

• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• The Stellar, Gas and Dynamical Masses of Star-Forming Galaxies at z~2
• COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies: I. Relations between H2, HI, stellar content and structural properties
• Dynamical Properties of z~2 Star Forming Galaxies and a Universal Star Formation Relation
• Highly-excited CO emission in APM08279+5255 at z=3.9
• Dust in starburst nuclei and ULIRGs: SED models for observers
• The Diverse Properties of the Most Ultraviolet Luminous Galaxies Discovered by the Galaxy Evolution Explorer
• A Detailed Study of Gas and Star Formation in a Highly Magnified Lyman Break Galaxy at z=3.07
• The Young and the Dustless: Interpreting Radio Observations of UltraViolet Luminous Galaxies

Cited by in corpus (5)

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• ISM conditions in z~0.2 Lyman-Break Analogs
• The Star-Forming Interstellar Medium of Lyman Break Galaxy Analogs
• Low-redshift analogues of cosmic noon galaxies as laboratories for clumpy star formation
• Tracing ionized gas kinematics in Lyman-Break Analogs. Implications for star formation compactness and outflow properties