THE SINS/zC-SINF survey of z ∼ 2 galaxy kinematics: Rest-frame morphology, structure, and colors from near-infrared hubble space telescope imaging
- Department of Physics, Institute for Astronomy, ETH Zurich, CH-8093 Zurich (Switzerland)
- Max-Planck-Institut für Extraterrestrische Physik (MPE), Giessenbachstr. 1, D-85748 Garching (Germany)
- INAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova (Italy)
- Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547 (United States)
- Istituto Nazionale di Astrofisica—Osservatorio Astronomico di Arcetri, Largo Enrico Fermi 5, I-50125 Firenze (Italy)
- Department of Astronomy, Campbell Hall, University of California, Berkeley, CA 94720 (United States)
We present the analysis of Hubble Space Telescope (HST) J- and H-band imaging for 29 galaxies on the star-forming main sequence at z ∼ 2, which have adaptive optics Very Large Telescope SINFONI integral field spectroscopy from our SINS/zC-SINF program. The SINFONI Hα data resolve the ongoing star formation and the ionized gas kinematics on scales of 1–2 kpc; the near-IR images trace the galaxies’ rest-frame optical morphologies and distributions of stellar mass in old stellar populations at a similar resolution. The global light profiles of most galaxies show disk-like properties well described by a single Sérsic profile with n∼1, with only ∼15% requiring a high n>3 Sérsic index, all more massive than 10{sup 10} M{sub ⊙}. In bulge+disk fits, about 40% of galaxies have a measurable bulge component in the light profiles, with ∼15% showing a substantial bulge-to-total ratio (B/T) B/T≳0.3. This is a lower limit to the frequency of z ∼ 2 massive galaxies with a developed bulge component in stellar mass because it could be hidden by dust and/or outshined by a thick actively star-forming disk component. The galaxies’ rest-optical half-light radii range between 1 and 7 kpc, with a median of 2.1 kpc, and lie slightly above the size–mass relation at these epochs reported in the literature. This is attributed to differences in sample selection and definitions of size and/or mass measurements. The (u−g){sub rest} color gradient and scatter within individual z ∼ 2 massive galaxies with ≳10{sup 11} M{sub ⊙} are as high as in z = 0 low-mass, late-type galaxies and are consistent with the high star formation rates of massive z ∼ 2 galaxies being sustained at large galactocentric distances.
- OSTI ID:
- 22882586
- Journal Information:
- Astrophysical Journal, Vol. 802, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
Similar Records
The SINS/zC-SINF survey of z ∼ 2 galaxy kinematics: Evidence for gravitational quenching
THE SINS/zC-SINF SURVEY of z {approx} 2 GALAXY KINEMATICS: OUTFLOW PROPERTIES