z~4 Halpha Emitters in GOODS : Tracing the Dominant Mode for Growth of Galaxies

Abstract

We present evidence for unusually strong Halpha emission in galaxies with spectroscopic redshifts in the range of 3.8<z<5.0, over the Great Observatories Origins Deep Survey (GOODS) fields. Among 74 galaxies detected in the Spitzer IRAC 3.6 and 4.5um bands, more than 70% of the galaxies show clear excess at 3.6um compared to the expected flux density from stellar continuum only. We provide evidence that this 3.6um excess is due to Halpha emission redshifted into the 3.6um band, and classify these 3.6um excess galaxies to be Halpha emitter (HAE) candidates. The selection of HAE candidates using an excess in broad-band filters is sensitive to objects whose rest-frame H$\alpha$ equivalent width is larger than 350A, star formation rates of 20-500 Msun/yr. The Halpha-to-UV luminosity ratio of HAEs is on average larger than that of local starbursts. Possible reasons for such strong Halpha emission in these galaxies include different dust extinction properties, young stellar population age, continuous star formation history, low metallicity, and top-heavy stellar initial mass function. Although the correlation between UV slope beta and L(Ha)/L(UV) raises the possibility that HAEs prefer a dust extinction curve which is steeper in the UV, the most dominant factor that results in strong Halpha emission appears to be star formation history. The Halpha equivalent widths of HAEs are large despite their relatively old stellar population ages constrained by SED fitting, suggesting that at least 60% of HAEs produce stars at a constant rate. Under the assumption that the cold gas supply is sustained, HAEs are able to produce ~50% of the observed stellar mass density at z~3 that is caught in massive (M*>10^11 Msun) galaxies. This 'strong Halpha phase' of star formation plays a dominant role in early galaxy growth, being a feasible progenitors of massive red galaxies at lower redshifts.

Accepted for publication in ApJ

References in corpus (14)

• Cold streams in early massive hot haloes as the main mode of galaxy formation
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 in the Subaru Deep Fields: Photometric Properties
• Star formation in AEGIS field galaxies since z=1.1 . Staged galaxy formation, and a model of mass-dependent gas exhaustion
• H-alpha Observations of a Large Sample of Galaxies at z~2: Implications for Star Formation in High Redshift Galaxies
• HiZELS: a high redshift survey of H-alpha emitters. I: the cosmic star-formation rate and clustering at z=2.23
• The Morphological Diversities Among Star-forming Galaxies at High Redshifts in the Great Observatories Origins Deep Survey (GOODS)
• Spectroscopic Confirmation Of An Extreme Starburst At Redshift 4.547
• A submillimetre galaxy at z=4.76 in the LABOCA survey of the Extended Chandra Deep Field South
• Molecular Gas in a Submillimeter Galaxy at z=4.5: Evidence for a Major Merger at 1 Billion Years after the Big Bang
• The Hubble Space Telescope GOODS NICMOS Survey: Overview and the Evolution of Massive Galaxies at 1.5 < z < 3
• Spitzer Observations of the z=2.73 Lensed Lyman Break Galaxy, MS1512-cB58
• Star formation rates in Lyman break galaxies: radio stacking of LBGs in the COSMOS field and the sub-$\mu$Jy radio source population
• The impact of nebular emission on the broadband fluxes of high-redshift galaxies

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