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http://hdl.handle.net/20.500.12386/26370
Titolo: | Spitzer UltRa Faint SUrvey Program (SURFS UP). II. IRAC-detected Lyman-Break Galaxies at 6 ≲ z ≲ 10 behind Strong-lensing Clusters | Autori: | Huang, Kuang-Han Bradač, Maruša Lemaux, Brian C. Ryan, R. E., Jr. Hoag, Austin CASTELLANO, MARCO Amorín, Ricardo FONTANA, Adriano Brammer, Gabriel B. Cain, Benjamin Lubin, L. M. MERLIN, Emiliano Schmidt, Kasper B. Schrabback, Tim Treu, Tommaso Gonzalez, Anthony H. von der Linden, Anja Knight, Robert I. |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 817 | Fascicolo: | 1 | Da pagina:: | 11 | Abstract: | We study the stellar population properties of the IRAC-detected 6 ≲ z ≲ 10 galaxy candidates from the Spitzer UltRa Faint SUrvey Program. Using the Lyman Break selection technique, we find a total of 17 galaxy candidates at 6 ≲ z ≲ 10 from Hubble Space Telescope images (including the full-depth images from the Hubble Frontier Fields program for MACS 1149 and MACS 0717) that have detections at signal-to-noise ratios ≥ 3 in at least one of the IRAC 3.6 and 4.5 μm channels. According to the best mass models available for the surveyed galaxy clusters, these IRAC-detected galaxy candidates are magnified by factors of ∼1.2-5.5. Due to the magnification of the foreground galaxy clusters, the rest-frame UV absolute magnitudes M<SUB>1600</SUB> are between -21.2 and -18.9 mag, while their intrinsic stellar masses are between 2 × 10<SUP>8</SUP>M<SUB>☉</SUB> and 2.9 × 10<SUP>9</SUP>M<SUB>☉</SUB>. We identify two Lyα emitters in our sample from the Keck DEIMOS spectra, one at z<SUB>Lyα</SUB> = 6.76 (in RXJ 1347) and one at z<SUB>Lyα</SUB> = 6.32 (in MACS 0454). We find that 4 out of 17 z ≳ 6 galaxy candidates are favored by z ≲ 1 solutions when IRAC fluxes are included in photometric redshift fitting. We also show that IRAC [3.6]-[4.5] color, when combined with photometric redshift, can be used to identify galaxies which likely have strong nebular emission lines or obscured active galactic nucleus contributions within certain redshift windows. | URI: | http://hdl.handle.net/20.500.12386/26370 | URL: | https://iopscience.iop.org/article/10.3847/0004-637X/817/1/11 | ISSN: | 0004-637X | DOI: | 10.3847/0004-637X/817/1/11 | Bibcode ADS: | 2016ApJ...817...11H | Fulltext: | open |
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