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D’Eugenio, Francesco; van der Wel, Arjen; Piotrowska, Joanna M; Bezanson, Rachel; Taylor, Edward N; van de Sande, Jesse; Baker, William M; Bell, Eric F; Bellstedt, Sabine; Bland-Hawthorn, Joss; Bluck, Asa F L; Brough, Sarah; Bryant, Julia J; Colless, Matthew; Cortese, Luca; Croom, Scott M; Derkenne, Caro; van Dokkum, Pieter; Fisher, Deanne; Foster, Caroline; Gallazzi, Anna; de Graaff, Anna; Groves, Brent; van Houdt, Josha; [...]

Evolution in the orbital structure of quiescent galaxies from MAGPI, LEGA-C, and SAMI surveys: direct evidence for merger-driven growth over the last 7 Gyr

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  • Medientyp: E-Artikel
  • Titel: Evolution in the orbital structure of quiescent galaxies from MAGPI, LEGA-C, and SAMI surveys: direct evidence for merger-driven growth over the last 7 Gyr
  • Beteiligte: D’Eugenio, Francesco; van der Wel, Arjen; Piotrowska, Joanna M; Bezanson, Rachel; Taylor, Edward N; van de Sande, Jesse; Baker, William M; Bell, Eric F; Bellstedt, Sabine; Bland-Hawthorn, Joss; Bluck, Asa F L; Brough, Sarah; Bryant, Julia J; Colless, Matthew; Cortese, Luca; Croom, Scott M; Derkenne, Caro; van Dokkum, Pieter; Fisher, Deanne; Foster, Caroline; Gallazzi, Anna; de Graaff, Anna; Groves, Brent; van Houdt, Josha; [...]
  • Erschienen: Oxford University Press (OUP), 2023
  • Erschienen in: Monthly Notices of the Royal Astronomical Society
  • Sprache: Englisch
  • DOI: 10.1093/mnras/stad800
  • ISSN: 0035-8711; 1365-2966
  • Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:title>ABSTRACT</jats:title> <jats:p>We present the first study of spatially integrated higher-order stellar kinematics over cosmic time. We use deep rest-frame optical spectroscopy of quiescent galaxies at redshifts z = 0.05, 0.3, and 0.8 from the SAMI, MAGPI, and LEGA-C surveys to measure the excess kurtosis h4 of the stellar velocity distribution, the latter parametrized as a Gauss-Hermite series. Conservatively using a redshift-independent cut in stellar mass ($M_\star = 10^{11}\, \mathrm{M_\odot }$) and matching the stellar-mass distributions of our samples, we find 7σ evidence of h4 increasing with cosmic time, from a median value of 0.019 ± 0.002 at z = 0.8 to 0.059 ± 0.004 at z = 0.06. Alternatively, we use a physically motivated sample selection based on the mass distribution of the progenitors of local quiescent galaxies as inferred from numerical simulations; in this case, we find 10σ evidence. This evolution suggests that, over the last 7 Gyr, there has been a gradual decrease in the rotation-to-dispersion ratio and an increase in the radial anisotropy of the stellar velocity distribution, qualitatively consistent with accretion of gas-poor satellites. These findings demonstrate that massive galaxies continue to accrete mass and increase their dispersion support after becoming quiescent.</jats:p>
  • Zugangsstatus: Freier Zugang