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http://hdl.handle.net/20.500.12386/28636
Title: | Spectral Energy Distributions of Companion Galaxies to z ∼ 6 Quasars | Authors: | Mazzucchelli, C. DECARLI, ROBERTO Farina, E. P. Bañados, E. Venemans, B. P. Strauss, M. A. Walter, F. Neeleman, M. Bertoldi, F. Fan, X. Riechers, D. Rix, H. -W. Wang, R. |
Issue Date: | 2019 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 881 | Issue: | 2 | First Page: | 163 | Abstract: | Massive, quiescent galaxies are already observed at redshift z ∼ 4, i.e., ∼1.5 Gyr after the big bang. Current models predict them to be formed via massive, gas-rich mergers at z > 6. Recent ALMA observations of the cool gas and dust in z ≳ 6 quasars have discovered [C II]- and far-infrared-bright galaxies adjacent to several quasars. In this work, we present sensitive imaging and spectroscopic follow-up observations, with HST/WFC3, Spitzer/IRAC, VLT/MUSE, Magellan/FIRE, and LBT/LUCI-MODS, of ALMA-detected, dust-rich companion galaxies of four quasars at z ≳ 6, specifically acquired to probe their stellar content and unobscured star formation rate. Three companion galaxies do not show significant emission in the observed optical/IR wavelength range. The photometric limits suggest that these galaxies are highly dust-enshrouded, with unobscured star formation rates SFR<SUB>UV</SUB> < few M <SUB>☉</SUB> yr<SUP>-1</SUP>, and a stellar content of M <SUB>*</SUB> < 10<SUP>10</SUP> M <SUB>☉</SUB> yr<SUP>-1</SUP>. However, the companion to PJ167-13 shows bright rest-frame UV emission (F140W AB = 25.48). Its spectral energy distribution resembles that of a star-forming galaxy with a total SFR ∼ 50 M <SUB>☉</SUB> yr<SUP>-1</SUP> and M <SUB>*</SUB> ∼ 9 × 10<SUP>9</SUP> M <SUB>☉</SUB>. All the companion sources are consistent with residing on the galaxy main sequence at z ∼ 6. Additional, deeper data from future facilities, such as the James Webb Space Telescope, are needed in order to characterize these gas-rich sources in the first gigayear of cosmic history. | URI: | http://hdl.handle.net/20.500.12386/28636 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab2f75 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab2f75 | Bibcode ADS: | 2019ApJ...881..163M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Mazzucchelli_2019_ApJ_881_163.pdf | Pdf editoriale | 2.18 MB | Adobe PDF | View/Open |
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