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Title: KMOS{sup 3D} Reveals Low-level Star Formation Activity in Massive Quiescent Galaxies at 0.7 < z < 2.7

Abstract

We explore the H α emission in the massive quiescent galaxies observed by the KMOS{sup 3D} survey at 0.7 < z < 2.7. The H α line is robustly detected in 20 out of 120 UVJ -selected quiescent galaxies, and we classify the emission mechanism using the H α line width and the [N ii]/H α line ratio. We find that AGNs are likely to be responsible for the line emission in more than half of the cases. We also find robust evidence for star formation activity in nine quiescent galaxies, which we explore in detail. The H α kinematics reveal rotating disks in five of the nine galaxies. The dust-corrected H α star formation rates are low (0.2–7 M {sub ⊙} yr{sup −1}), and place these systems significantly below the main sequence. The 24 μ m-based, infrared luminosities, instead, overestimate the star formation rates. These galaxies present a lower gas-phase metallicity compared to star-forming objects with similar stellar mass, and many of them have close companions. We therefore conclude that the low-level star formation activity in these nine quiescent galaxies is likely to be fueled by inflowing gas or minor mergers, and could be a sign of rejuvenation events.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2]; ;  [3] more »; « less
  1. Max-Planck-Institut für Extraterrestrische Physik (MPE), Giessenbachstr. 1, D-85748 Garching (Germany)
  2. Department of Physics, University of Bath, Claverton Down, Bath, BA2 7AY (United Kingdom)
  3. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
Publication Date:
OSTI Identifier:
22654475
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 841; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BALMER LINES; COMPARATIVE EVALUATIONS; EMISSION; EVOLUTION; GALAXIES; LINE WIDTHS; LUMINOSITY; MASS; METALLICITY; RED SHIFT; STARS

Citation Formats

Belli, Sirio, Genzel, Reinhard, Förster Schreiber, Natascha M., Wisnioski, Emily, Wilman, David J., Mendel, J. Trevor, Beifiori, Alessandra, Bender, Ralf, Burkert, Andreas, Chan, Jeffrey, Davies, Rebecca L., Davies, Ric, Fabricius, Maximilian, Fossati, Matteo, Galametz, Audrey, Lang, Philipp, Lutz, Dieter, Wuyts, Stijn, Brammer, Gabriel B., Momcheva, Ivelina G., and and others. KMOS{sup 3D} Reveals Low-level Star Formation Activity in Massive Quiescent Galaxies at 0.7 < z < 2.7. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA70E5.
Belli, Sirio, Genzel, Reinhard, Förster Schreiber, Natascha M., Wisnioski, Emily, Wilman, David J., Mendel, J. Trevor, Beifiori, Alessandra, Bender, Ralf, Burkert, Andreas, Chan, Jeffrey, Davies, Rebecca L., Davies, Ric, Fabricius, Maximilian, Fossati, Matteo, Galametz, Audrey, Lang, Philipp, Lutz, Dieter, Wuyts, Stijn, Brammer, Gabriel B., Momcheva, Ivelina G., & and others. KMOS{sup 3D} Reveals Low-level Star Formation Activity in Massive Quiescent Galaxies at 0.7 < z < 2.7. United States. doi:10.3847/2041-8213/AA70E5.
Belli, Sirio, Genzel, Reinhard, Förster Schreiber, Natascha M., Wisnioski, Emily, Wilman, David J., Mendel, J. Trevor, Beifiori, Alessandra, Bender, Ralf, Burkert, Andreas, Chan, Jeffrey, Davies, Rebecca L., Davies, Ric, Fabricius, Maximilian, Fossati, Matteo, Galametz, Audrey, Lang, Philipp, Lutz, Dieter, Wuyts, Stijn, Brammer, Gabriel B., Momcheva, Ivelina G., and and others. Sat . "KMOS{sup 3D} Reveals Low-level Star Formation Activity in Massive Quiescent Galaxies at 0.7 < z < 2.7". United States. doi:10.3847/2041-8213/AA70E5.
@article{osti_22654475,
title = {KMOS{sup 3D} Reveals Low-level Star Formation Activity in Massive Quiescent Galaxies at 0.7 < z < 2.7},
author = {Belli, Sirio and Genzel, Reinhard and Förster Schreiber, Natascha M. and Wisnioski, Emily and Wilman, David J. and Mendel, J. Trevor and Beifiori, Alessandra and Bender, Ralf and Burkert, Andreas and Chan, Jeffrey and Davies, Rebecca L. and Davies, Ric and Fabricius, Maximilian and Fossati, Matteo and Galametz, Audrey and Lang, Philipp and Lutz, Dieter and Wuyts, Stijn and Brammer, Gabriel B. and Momcheva, Ivelina G. and and others},
abstractNote = {We explore the H α emission in the massive quiescent galaxies observed by the KMOS{sup 3D} survey at 0.7 < z < 2.7. The H α line is robustly detected in 20 out of 120 UVJ -selected quiescent galaxies, and we classify the emission mechanism using the H α line width and the [N ii]/H α line ratio. We find that AGNs are likely to be responsible for the line emission in more than half of the cases. We also find robust evidence for star formation activity in nine quiescent galaxies, which we explore in detail. The H α kinematics reveal rotating disks in five of the nine galaxies. The dust-corrected H α star formation rates are low (0.2–7 M {sub ⊙} yr{sup −1}), and place these systems significantly below the main sequence. The 24 μ m-based, infrared luminosities, instead, overestimate the star formation rates. These galaxies present a lower gas-phase metallicity compared to star-forming objects with similar stellar mass, and many of them have close companions. We therefore conclude that the low-level star formation activity in these nine quiescent galaxies is likely to be fueled by inflowing gas or minor mergers, and could be a sign of rejuvenation events.},
doi = {10.3847/2041-8213/AA70E5},
journal = {Astrophysical Journal Letters},
number = 1,
volume = 841,
place = {United States},
year = {Sat May 20 00:00:00 EDT 2017},
month = {Sat May 20 00:00:00 EDT 2017}
}