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A Comprehensive Study of Hα Emitters at z ∼ 0.62 in the DAWN Survey: The Need for Deep and Wide Regions

Abstract : We present new estimates of the luminosity function (LF) and star formation rate density (SFRD) for an Hα-selected sample at z ∼ 0.62 from the Deep And Wide Narrow-band (DAWN) survey. Our results are based on a new Hα sample in the extended COSMOS region (compared to Coughlin et al.) with the inclusion of flanking fields, resulting in a total area coverage of ∼1.5 deg2. A total of 241 Hα emitters were selected based on robust selection criteria using spectrophotometric redshifts and broadband color-color classification. Given that dust extinction is a dominant uncertainty in the estimation of LF and SFRD, we explore the effect of different dust-correction prescriptions by calculating the LF and SFRD using a constant dust extinction correction, A = 1 mag, a luminosity-dependent correction, and a stellar-mass-dependent correction. The resulting Hα LFs are well fitted using Schechter functions with best-fit parameters: L* = 1042.24 erg s-1, φ* = 10-2.85 Mpc-3, α = -1.62 for constant dust correction, L*=1042.31 erg s-1, φ* = 10-2.8 Mpc-3, α = -1.39 for luminosity-dependent dust correction, and L* = 1042.36 erg s-1, φ* = 10-2.91 Mpc-3, α = -1.48, for stellar-mass-dependent dust correction. The deep and wide nature of the DAWN survey effectively samples Hα emitters over a wide range of luminosities, thereby providing better constraints on both the faint and bright ends of the LF. Also, the SFRD estimates ρSFR = 10-1.39 M yr-1 Mpc-3 (constant dust correction), ρSFR = 10-1.47 M yr-1 Mpc-3 (luminosity-dependent dust correction), and ρSFR = 10-1.46 M yr-1 Mpc-3 (stellar-mass-dependent dust correction) are in good agreement with the evolution of SFRD across redshifts (0 < z < 2) seen from previous Hα surveys.
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Submitted on : Friday, July 1, 2022 - 1:51:56 PM
Last modification on : Saturday, September 24, 2022 - 12:02:05 PM

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Santosh Harish, Alicia Coughlin, James E. Rhoads, Sangeeta Malhotra, Steven L. Finkelstein, et al.. A Comprehensive Study of Hα Emitters at z ∼ 0.62 in the DAWN Survey: The Need for Deep and Wide Regions. The Astrophysical Journal, 2020, 892, ⟨10.3847/1538-4357/ab7015⟩. ⟨insu-03711477⟩

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