skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: THE SINS/zC-SINF SURVEY OF z {approx} 2GALAXY KINEMATICS: THE NATURE OF DISPERSION-DOMINATED GALAXIES

Abstract

We analyze the spectra, spatial distributions, and kinematics of H{alpha}, [N II], and [S II] emission in a sample of 38, z {approx} 2.2 UV/optically selected star-forming galaxies (SFGs) from the SINS and zC-SINF surveys, 34 of which were observed in the adaptive optics mode of SINFONI and 30 of those contain data presented for the first time here. This is supplemented by kinematic data from 43 z {approx} 1-2.5 galaxies from the literature. None of these 81 galaxies is an obvious major merger. We find that the kinematic classification of high-z SFGs as ''dispersion dominated'' or ''rotation dominated'' correlates most strongly with their intrinsic sizes. Smaller galaxies are more likely ''dispersion-dominated'' for two main reasons: (1) the rotation velocity scales linearly with galaxy size but intrinsic velocity dispersion does not depend on size or may even increase in smaller galaxies, and as such, their ratio is systematically lower for smaller galaxies, and (2) beam smearing strongly decreases large-scale velocity gradients and increases observed dispersion much more for galaxies with sizes at or below the resolution. Dispersion-dominated SFGs may thus have intrinsic properties similar to ''rotation-dominated'' SFGs, but are primarily more compact, lower mass, less metal enriched, and may havemore » higher gas fractions, plausibly because they represent an earlier evolutionary state.« less

Authors:
;  [1]; ; ; ; ; ;  [2];  [3]; ;  [4]; ; ;  [5];  [6];  [7];  [8];  [9];  [10];  [11] more »; « less
  1. Department of Astronomy, Campbell Hall, University of California, Berkeley, CA 94720 (United States)
  2. Max-Planck-Institut fuer extraterrestrische Physik (MPE), Giessenbachstr. 1, D-85748 Garching (Germany)
  3. Space Sciences Research Group, Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 (United States)
  4. Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, Padova I-35122 (Italy)
  5. Institute of Astronomy, Department of Physics, Eidgenoessische Technische Hochschule, ETH Zuerich CH-8093 (Switzerland)
  6. Universite de Toulouse, UPS-OMP, IRAP, Toulouse (France)
  7. Universitaets-Sternwarte Ludwig-Maximilians-Universitaet (USM), Scheinerstr. 1, Muenchen D-81679 (Germany)
  8. Istituto Nazionale di Astrofisica Osservatorio Astronomico di Arcetri, Largo Enrico Fermi 5, I-50125 Firenze (Italy)
  9. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  10. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580 (United States)
  11. Max-Planck Institute for Astrophysics, Karl Schwarzschildstrasse 1, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
22126933
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 767; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BEAMS; CLASSIFICATION; DISPERSIONS; EMISSION; GALAXIES; RED SHIFT; ROTATION; SPATIAL DISTRIBUTION; SPECTRA; STARS; VELOCITY

Citation Formats

Newman, Sarah F., Genzel, Reinhard, Foerster Schreiber, Natascha M., Buschkamp, Peter, Davies, Ric, Eisenhauer, Frank, Kurk, Jaron, Lutz, Dieter, Shapiro Griffin, Kristen, Mancini, Chiara, Renzini, Alvio, Lilly, Simon J., Carollo, C. Marcella, Peng, Yingjie, Bouche, Nicolas, Burkert, Andreas, Cresci, Giovanni, Genel, Shy, Hicks, Erin K. S., Naab, Thorsten, and others, and. THE SINS/zC-SINF SURVEY OF z {approx} 2GALAXY KINEMATICS: THE NATURE OF DISPERSION-DOMINATED GALAXIES. United States: N. p., 2013. Web. doi:10.1088/0004-637X/767/2/104.
Newman, Sarah F., Genzel, Reinhard, Foerster Schreiber, Natascha M., Buschkamp, Peter, Davies, Ric, Eisenhauer, Frank, Kurk, Jaron, Lutz, Dieter, Shapiro Griffin, Kristen, Mancini, Chiara, Renzini, Alvio, Lilly, Simon J., Carollo, C. Marcella, Peng, Yingjie, Bouche, Nicolas, Burkert, Andreas, Cresci, Giovanni, Genel, Shy, Hicks, Erin K. S., Naab, Thorsten, & others, and. THE SINS/zC-SINF SURVEY OF z {approx} 2GALAXY KINEMATICS: THE NATURE OF DISPERSION-DOMINATED GALAXIES. United States. https://doi.org/10.1088/0004-637X/767/2/104
Newman, Sarah F., Genzel, Reinhard, Foerster Schreiber, Natascha M., Buschkamp, Peter, Davies, Ric, Eisenhauer, Frank, Kurk, Jaron, Lutz, Dieter, Shapiro Griffin, Kristen, Mancini, Chiara, Renzini, Alvio, Lilly, Simon J., Carollo, C. Marcella, Peng, Yingjie, Bouche, Nicolas, Burkert, Andreas, Cresci, Giovanni, Genel, Shy, Hicks, Erin K. S., Naab, Thorsten, and others, and. 2013. "THE SINS/zC-SINF SURVEY OF z {approx} 2GALAXY KINEMATICS: THE NATURE OF DISPERSION-DOMINATED GALAXIES". United States. https://doi.org/10.1088/0004-637X/767/2/104.
@article{osti_22126933,
title = {THE SINS/zC-SINF SURVEY OF z {approx} 2GALAXY KINEMATICS: THE NATURE OF DISPERSION-DOMINATED GALAXIES},
author = {Newman, Sarah F. and Genzel, Reinhard and Foerster Schreiber, Natascha M. and Buschkamp, Peter and Davies, Ric and Eisenhauer, Frank and Kurk, Jaron and Lutz, Dieter and Shapiro Griffin, Kristen and Mancini, Chiara and Renzini, Alvio and Lilly, Simon J. and Carollo, C. Marcella and Peng, Yingjie and Bouche, Nicolas and Burkert, Andreas and Cresci, Giovanni and Genel, Shy and Hicks, Erin K. S. and Naab, Thorsten and others, and},
abstractNote = {We analyze the spectra, spatial distributions, and kinematics of H{alpha}, [N II], and [S II] emission in a sample of 38, z {approx} 2.2 UV/optically selected star-forming galaxies (SFGs) from the SINS and zC-SINF surveys, 34 of which were observed in the adaptive optics mode of SINFONI and 30 of those contain data presented for the first time here. This is supplemented by kinematic data from 43 z {approx} 1-2.5 galaxies from the literature. None of these 81 galaxies is an obvious major merger. We find that the kinematic classification of high-z SFGs as ''dispersion dominated'' or ''rotation dominated'' correlates most strongly with their intrinsic sizes. Smaller galaxies are more likely ''dispersion-dominated'' for two main reasons: (1) the rotation velocity scales linearly with galaxy size but intrinsic velocity dispersion does not depend on size or may even increase in smaller galaxies, and as such, their ratio is systematically lower for smaller galaxies, and (2) beam smearing strongly decreases large-scale velocity gradients and increases observed dispersion much more for galaxies with sizes at or below the resolution. Dispersion-dominated SFGs may thus have intrinsic properties similar to ''rotation-dominated'' SFGs, but are primarily more compact, lower mass, less metal enriched, and may have higher gas fractions, plausibly because they represent an earlier evolutionary state.},
doi = {10.1088/0004-637X/767/2/104},
url = {https://www.osti.gov/biblio/22126933}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 767,
place = {United States},
year = {Sat Apr 20 00:00:00 EDT 2013},
month = {Sat Apr 20 00:00:00 EDT 2013}
}