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The Ultraviolet Luminosity Function at 0.6 z 1 from UVCANDELS
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The Ultraviolet Luminosity Function at 0.6 z 1 from UVCANDELS

Lei Sun, Xin Wang, Harry I. Teplitz, Vihang Mehta, Anahita Alavi, Marc Rafelski, Rogier A. Windhorst, Claudia Scarlata, Jonathan P. Gardner, Brent M. Smith, …
The Astrophysical journal, 卷.972(1), 頁.8
01/09/2024
DOI: https://doi.org/10.3847/1538-4357/ad5540
Web of Science ID: WOS:001337754100001

摘要

Astronomy & Astrophysics Physical Sciences Science & Technology
UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W imaging in four CANDELS fields-GOODS-N, GOODS-S, EGS, and COSMOS-covering a total area of similar to 426 arcmin(2). This is similar to 2.7 times larger than the area covered by previous deep-field space UV data combined, reaching a depth of about 27 and 28 ABmag (5 sigma in 0."2 apertures) for F275W and F435W, respectively. Along with new photometric catalogs, we present an analysis of the rest-frame UV luminosity function (LF), relying on our UV-optimized aperture photometry method, yielding a factor of 1.5 increase over H-isophot aperture photometry in the signal-to-noise ratios of galaxies in our F275W imaging. Using well-tested photometric redshift measurements, we identify 5810 galaxies at redshifts 0.6 < z < 1, down to an absolute magnitude of M-UV = -14.2. In order to minimize the effect of uncertainties in estimating the completeness function, especially at the faint end, we restrict our analysis to sources above 30% completeness, which provides a final sample of 4726 galaxies at -21.5 < M-UV < -15.5. We performed a maximum likelihood estimate to derive the best-fit parameters of the UV LF. We report a best-fit faint-end slope of alpha=-1.359(-0.041)(+0.041) at z similar to 0.8. Creating subsamples at z similar to 0.7 and z similar to 0.9, we observe a possible evolution of alpha with redshift. The unobscured UV luminosity density at M-UV < -10 is derived as rho(UV)=1.339(-0.030)(+0.027)(x10(26)ergs(-1)Hz(-1)Mpc(-3)) using our best-fit LF parameters. The new F275W and F435 photometric catalogs from UVCANDELS have been made publicly available on the Barbara A. Mikulski Archive for Space Telescopes.

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