Bridge, Joanna S, Holwerda, Benne W, Stefanon, Mauro, Bouwens, Rychard J, Oesch, Pascal A, Trenti, Michele, Bernard, Stephanie R, Bradley, Larry D, Illingworth, Garth D, Kusmic, Samir, Magee, Dan, Morishita, Takahiro, Roberts-Borsani, Guido W, Smit, Renske and Steele, Rebecca L (2019) The Super Eight Galaxies: Properties of a Sample of Very Bright Galaxies at 7 < z < 8. Astrophysical Journal, 882 (1). ISSN 0004-637X

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Abstract

We present the Super Eight galaxies—a set of very luminous, high-redshift (7.1 < z < 8.0) galaxy candidates found in the Brightest of Reionizing Galaxies (BoRG) Survey fields. The original sample includes eight galaxies that are Y-band dropout objects with H-band magnitudes of m H < 25.5. Four of these objects were originally reported in Calvi et al. Combining new Hubble Space Telescope (HST) WFC3/F814W imaging and Spitzer IRAC data with archival imaging from BoRG and other surveys, we explore the properties of these galaxies. Photometric redshift fitting places six of these galaxies in the redshift range of 7.1 < z < 8.0, resulting in three new high-redshift galaxies and confirming three of the four high-redshift galaxy candidates from Calvi et al. We calculate the half-light radii of the Super Eight galaxies using the HST F160W filter and find that the Super Eight sizes are in line with the typical evolution of size with redshift. The Super Eights have a mean mass of log (M */M ⊙) ~10, which is typical for sources in this luminosity range. Finally, we place our sample on the UV z ~ 8 luminosity function and find that the Super Eight number density is consistent with other surveys in this magnitude and redshift range.

Item Type:	Article
Uncontrolled Keywords:	Science & Technology; Physical Sciences; Astronomy & Astrophysics; galaxies: evolution; galaxies: high-redshift; galaxies: photometry; ULTRA-DEEP FIELD; STELLAR POPULATION SYNTHESIS; UV LUMINOSITY FUNCTION; STAR-FORMING GALAXIES; LY-ALPHA EMITTERS; UDF05 FOLLOW-UP; FAINT-END SLOPE; LYMAN-ALPHA; TO 6; SIZE EVOLUTION; Science & Technology; Physical Sciences; Astronomy & Astrophysics; galaxies: evolution; galaxies: high-redshift; galaxies: photometry; ULTRA-DEEP FIELD; STELLAR POPULATION SYNTHESIS; UV LUMINOSITY FUNCTION; STAR-FORMING GALAXIES; LY-ALPHA EMITTERS; UDF05 FOLLOW-UP; FAINT-END SLOPE; LYMAN-ALPHA; TO 6; SIZE EVOLUTION; 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	American Astronomical Society; IOP Publishing
SWORD Depositor:	A Symplectic
Date Deposited:	15 Nov 2022 12:19
Last Modified:	15 Nov 2022 12:30
DOI or ID number:	10.3847/1538-4357/ab3213
URI:	https://researchonline.ljmu.ac.uk/id/eprint/18132

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