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http://hdl.handle.net/20.500.12386/29676
Titolo: | CANDELS Sheds Light on the Environmental Quenching of Low-mass Galaxies | Autori: | Guo, Yicheng Bell, Eric F. Lu, Yu Koo, David C. Faber, S. M. Koekemoer, Anton M. Kurczynski, Peter Lee, Seong-Kook Papovich, Casey Chen, Zhu Dekel, Avishai Ferguson, Henry C. FONTANA, Adriano Giavalisco, Mauro Kocevski, Dale D. Nayyeri, Hooshang Pérez-González, Pablo G. Pforr, Janine Rodríguez-Puebla, Aldo SANTINI, Paola |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 841 | Fascicolo: | 2 | Da pagina:: | L22 | Abstract: | We investigate the environmental quenching of galaxies, especially those with stellar masses (M <SUB>*</SUB>) < 10<SUP>9.5</SUP> M <SUB>☉</SUB>, beyond the local universe. Essentially all local low-mass quenched galaxies (QGs) are believed to live close to massive central galaxies, which is a demonstration of environmental quenching. We use CANDELS data to test whether or not such a dwarf QG-massive central galaxy connection exists beyond the local universe. For this purpose, we only need a statistically representative, rather than complete, sample of low-mass galaxies, which enables our study to z ≳ 1.5. For each low-mass galaxy, we measure the projected distance (d <SUB>proj</SUB>) to its nearest massive neighbor (M <SUB>*</SUB> > 10<SUP>10.5</SUP> M <SUB>☉</SUB>) within a redshift range. At a given z and M <SUB>*</SUB>, the environmental quenching effect is considered to be observed if the d <SUB>proj</SUB> distribution of QGs ({d}<SUB>{proj</SUB>}<SUP>Q</SUP>) is significantly skewed toward lower values than that of star-forming galaxies ({d}<SUB>{proj</SUB>}<SUP>{SF</SUP>}). For galaxies with 10<SUP>8</SUP> M <SUB>☉</SUB> < M <SUB>*</SUB> < 10<SUP>10</SUP> M <SUB>☉</SUB>, such a difference between {d}<SUB>{proj</SUB>}<SUP>Q</SUP> and {d}<SUB>{proj</SUB>}<SUP>{SF</SUP>} is detected up to z ∼ 1. Also, about 10% of the quenched galaxies in our sample are located between two and four virial radii (R <SUB>Vir</SUB>) of the massive halos. The median projected distance from low-mass QGs to their massive neighbors, {d}<SUB>{proj</SUB>}<SUP>Q</SUP>/{R}<SUB>{Vir</SUB>}, decreases with satellite M <SUB>*</SUB> at M <SUB>*</SUB> ≲ 10<SUP>9.5</SUP> M <SUB>☉</SUB>, but increases with satellite M <SUB>*</SUB> at M <SUB>*</SUB> ≳ 10<SUP>9.5</SUP> M <SUB>☉</SUB>. This trend suggests a smooth, if any, transition of the quenching timescale around M <SUB>*</SUB> ∼ 10<SUP>9.5</SUP> M <SUB>☉</SUB> at 0.5 < z < 1.0. | URI: | http://hdl.handle.net/20.500.12386/29676 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/aa70e9 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/aa70e9 | Bibcode ADS: | 2017ApJ...841L..22G | Fulltext: | open |
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