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Spatially resolved stellar kinematics from LEGA-C : increased rotational support in z ∼ 0.8 quiescent galaxies

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Abstract
We present stellar rotation curves and velocity dispersion profiles for 104 quiescent galaxies at z = 0.6-1 from the Large Early Galaxy Astrophysics Census (LEGA-C) spectroscopic survey. Rotation is typically probed across 10-20 kpc, or to an average of 2.7R(e). Combined with central stellar velocity dispersions (sigma(0)) this provides the first determination of the dynamical state of a sample selected by a lack of star formation activity at large lookback time. The most massive galaxies (M-star > 2 x 10(11) M-circle dot) generally show no or little rotation measured at 5 kpc (vertical bar V-5 vertical bar /sigma(0) < 0.2 in eight of ten cases), while similar to 64% of less massive galaxies show significant rotation. This is reminiscent of local fast-and slow-rotating ellipticals and implies that low-and high-redshift quiescent galaxies have qualitatively similar dynamical structures. We compare vertical bar V-5 vertical bar sigma(0) distributions at z similar to 0.8 and the present day by re-binning and smoothing the kinematic maps of 91 low-redshift quiescent galaxies from the Calar Alto Legacy Integral Field Area (CALIFA) survey and find evidence for a decrease in rotational support since z similar to 1. This result is especially strong when galaxies are compared at fixed velocity dispersion; if velocity dispersion does not evolve for individual galaxies then the rotational velocity at 5 kpc was an average of 94 +/- 22% higher in z similar to 0.8 quiescent galaxies than today. Considering that the number of quiescent galaxies grows with time and that new additions to the population descend from rotationally supported star-forming galaxies, our results imply that quiescent galaxies must lose angular momentum between z similar to 1 and the present, presumably through dissipationless merging, and/or that the mechanism that transforms star-forming galaxies also reduces their rotational support.
Keywords
galaxies, elliptical and lenticular, cD - galaxies, evolution - galaxies, high-redshift - galaxies, kinematics and dynamics - galaxies, structure, HUBBLE-SPACE-TELESCOPE, TULLY-FISHER RELATION, SUPERDENSE MASSIVE GALAXIES, STAR-FORMING GALAXIES, INSIDE-OUT GROWTH, INFRARED SPECTROSCOPIC SURVEY, HIGH-REDSHIFT GALAXIES, K-SELECTED GALAXIES, SAMI PILOT SURVEY, ELLIPTIC GALAXIES

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MLA
Bezanson, Rachel, Arjen van der Wel, Camilla Pacifici, et al. “Spatially Resolved Stellar Kinematics from LEGA-C : Increased Rotational Support in z ∼ 0.8 Quiescent Galaxies.” ASTROPHYSICAL JOURNAL 858.1 (2018): n. pag. Print.
APA
Bezanson, R., van der Wel, A., Pacifici, C., Noeske, K., Barišić, I., Bell, E. F., Brammer, G. B., et al. (2018). Spatially resolved stellar kinematics from LEGA-C : increased rotational support in z ∼ 0.8 quiescent galaxies. ASTROPHYSICAL JOURNAL, 858(1).
Chicago author-date
Bezanson, Rachel, Arjen van der Wel, Camilla Pacifici, Kai Noeske, Ivana Barišić, Eric F Bell, Gabriel B Brammer, et al. 2018. “Spatially Resolved Stellar Kinematics from LEGA-C : Increased Rotational Support in z ∼ 0.8 Quiescent Galaxies.” Astrophysical Journal 858 (1).
Chicago author-date (all authors)
Bezanson, Rachel, Arjen van der Wel, Camilla Pacifici, Kai Noeske, Ivana Barišić, Eric F Bell, Gabriel B Brammer, Joao Calhau, Priscilla Chauke, Pieter van Dokkum, Marijn Franx, Anna Gallazzi, Josha van Houdt, Ivo Labbé, Michael V Maseda, Juan Carlos Muños-Mateos, Adam Muzzin, Jesse van de Sande, David Sobral, Caroline Straatman, and Po-Feng Wu. 2018. “Spatially Resolved Stellar Kinematics from LEGA-C : Increased Rotational Support in z ∼ 0.8 Quiescent Galaxies.” Astrophysical Journal 858 (1).
Vancouver
1.
Bezanson R, van der Wel A, Pacifici C, Noeske K, Barišić I, Bell EF, et al. Spatially resolved stellar kinematics from LEGA-C : increased rotational support in z ∼ 0.8 quiescent galaxies. ASTROPHYSICAL JOURNAL. 2018;858(1).
IEEE
[1]
R. Bezanson et al., “Spatially resolved stellar kinematics from LEGA-C : increased rotational support in z ∼ 0.8 quiescent galaxies,” ASTROPHYSICAL JOURNAL, vol. 858, no. 1, 2018.
@article{8562684,
  abstract     = {We present stellar rotation curves and velocity dispersion profiles for 104 quiescent galaxies at z = 0.6-1 from the Large Early Galaxy Astrophysics Census (LEGA-C) spectroscopic survey. Rotation is typically probed across 10-20 kpc, or to an average of 2.7R(e). Combined with central stellar velocity dispersions (sigma(0)) this provides the first determination of the dynamical state of a sample selected by a lack of star formation activity at large lookback time. The most massive galaxies (M-star > 2 x 10(11) M-circle dot) generally show no or little rotation measured at 5 kpc (vertical bar V-5 vertical bar /sigma(0) < 0.2 in eight of ten cases), while similar to 64% of less massive galaxies show significant rotation. This is reminiscent of local fast-and slow-rotating ellipticals and implies that low-and high-redshift quiescent galaxies have qualitatively similar dynamical structures. We compare vertical bar V-5 vertical bar sigma(0) distributions at z similar to 0.8 and the present day by re-binning and smoothing the kinematic maps of 91 low-redshift quiescent galaxies from the Calar Alto Legacy Integral Field Area (CALIFA) survey and find evidence for a decrease in rotational support since z similar to 1. This result is especially strong when galaxies are compared at fixed velocity dispersion; if velocity dispersion does not evolve for individual galaxies then the rotational velocity at 5 kpc was an average of 94 +/- 22% higher in z similar to 0.8 quiescent galaxies than today. Considering that the number of quiescent galaxies grows with time and that new additions to the population descend from rotationally supported star-forming galaxies, our results imply that quiescent galaxies must lose angular momentum between z similar to 1 and the present, presumably through dissipationless merging, and/or that the mechanism that transforms star-forming galaxies also reduces their rotational support.},
  articleno    = {60},
  author       = {Bezanson, Rachel and van der Wel, Arjen and Pacifici, Camilla and Noeske, Kai and Barišić, Ivana and Bell, Eric F and Brammer, Gabriel B and Calhau, Joao and Chauke, Priscilla and van Dokkum, Pieter and Franx, Marijn and Gallazzi, Anna and van Houdt, Josha and Labbé, Ivo and Maseda, Michael V and Muños-Mateos, Juan Carlos and Muzzin, Adam and van de Sande, Jesse and Sobral, David and Straatman, Caroline and Wu, Po-Feng},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {galaxies,elliptical and lenticular,cD - galaxies,evolution - galaxies,high-redshift - galaxies,kinematics and dynamics - galaxies,structure,HUBBLE-SPACE-TELESCOPE,TULLY-FISHER RELATION,SUPERDENSE MASSIVE GALAXIES,STAR-FORMING GALAXIES,INSIDE-OUT GROWTH,INFRARED SPECTROSCOPIC SURVEY,HIGH-REDSHIFT GALAXIES,K-SELECTED GALAXIES,SAMI PILOT SURVEY,ELLIPTIC GALAXIES},
  language     = {eng},
  number       = {1},
  pages        = {26},
  title        = {Spatially resolved stellar kinematics from LEGA-C : increased rotational support in z ∼ 0.8 quiescent galaxies},
  url          = {http://dx.doi.org/10.3847/1538-4357/aabc55},
  volume       = {858},
  year         = {2018},
}

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