Advanced search
1 file | 3.50 MB Add to list

Molecular gas contents and scaling relations for massive, passive galaxies at intermediate redshifts from the LEGA-C Survey

Author
Organization
Abstract
A decade of study has established that the molecular gas properties of star-forming galaxies follow coherent scaling relations out to z similar to 3, suggesting remarkable regularity of the interplay between molecular gas, star formation, and stellar growth. Passive galaxies, however, are expected to be gas-poor and therefore faint, and thus little is known about molecular gas in passive galaxies beyond the local universe. Here we present deep Atacama Large Millimeter/submillimeter Array observations of CO(2-1) emission in eight massive (M-star similar to 10(11 )M(circle dot)) galaxies at z similar to 0.7 selected to lie a factor of 3-10 below the star-forming sequence at this redshift, drawn from the Large Early Galaxy Astrophysics Census survey. We significantly detect half the sample, finding molecular gas fractions less than or similar to 0.1. We show that the molecular and stellar rotational axes are broadly consistent, arguing that the molecular gas was not accreted after the galaxies became quiescent. We find that scaling relations extrapolated from the star-forming population overpredict both the gas fraction and gas depletion time for passive objects, suggesting the existence of either a break or large increase in scatter in these relations at low specific star formation rate. Finally, we show that the gas fractions of the passive galaxies we have observed at intermediate redshifts are naturally consistent with evolution into local, massive early-type galaxies by continued low-level star formation, with no need for further gas accretion or dynamical stabilization of the gas reservoirs in the intervening 6 billion years.
Keywords
STAR-FORMING GALAXIES, ACTIVE GALACTIC NUCLEI, SIMILAR-TO 1, EAGLE, SIMULATIONS, ATLAS(3D) PROJECT, CONVERSION FACTOR, STELLAR MASS, FORMATION HISTORIES, FORMATION RATES, MAIN-SEQUENCE, galaxies: evolution, galaxies: high-redshift, galaxies: ISM

Downloads

  • Molecular Gas Contents and Scaling Relations for Massive, Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 3.50 MB

Citation

Please use this url to cite or link to this publication:

MLA
Spilker, Justin, Rachel Bezanson, Ivana Barisic, et al. “Molecular Gas Contents and Scaling Relations for Massive, Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey.” ASTROPHYSICAL JOURNAL 860.2 (2018): n. pag. Print.
APA
Spilker, J., Bezanson, R., Barisic, I., Bell, E., Lagos, C. del P., Maseda, M., Muzzin, A., et al. (2018). Molecular gas contents and scaling relations for massive, passive galaxies at intermediate redshifts from the LEGA-C Survey. ASTROPHYSICAL JOURNAL, 860(2).
Chicago author-date
Spilker, Justin, Rachel Bezanson, Ivana Barisic, Eric Bell, Claudia del P Lagos, Michael Maseda, Adam Muzzin, et al. 2018. “Molecular Gas Contents and Scaling Relations for Massive, Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey.” Astrophysical Journal 860 (2).
Chicago author-date (all authors)
Spilker, Justin, Rachel Bezanson, Ivana Barisic, Eric Bell, Claudia del P Lagos, Michael Maseda, Adam Muzzin, Camilla Pacifici, David Sobral, Caroline Straatman, Arjen van der Wel, Pieter van Dokkum, Benjamin Weiner, Katherine Whitaker, Christina C Williams, and Po-Feng Wu. 2018. “Molecular Gas Contents and Scaling Relations for Massive, Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey.” Astrophysical Journal 860 (2).
Vancouver
1.
Spilker J, Bezanson R, Barisic I, Bell E, Lagos C del P, Maseda M, et al. Molecular gas contents and scaling relations for massive, passive galaxies at intermediate redshifts from the LEGA-C Survey. ASTROPHYSICAL JOURNAL. 2018;860(2).
IEEE
[1]
J. Spilker et al., “Molecular gas contents and scaling relations for massive, passive galaxies at intermediate redshifts from the LEGA-C Survey,” ASTROPHYSICAL JOURNAL, vol. 860, no. 2, 2018.
@article{8576831,
  abstract     = {A decade of study has established that the molecular gas properties of star-forming galaxies follow coherent scaling relations out to z similar to 3, suggesting remarkable regularity of the interplay between molecular gas, star formation, and stellar growth. Passive galaxies, however, are expected to be gas-poor and therefore faint, and thus little is known about molecular gas in passive galaxies beyond the local universe. Here we present deep Atacama Large Millimeter/submillimeter Array observations of CO(2-1) emission in eight massive (M-star similar to 10(11 )M(circle dot)) galaxies at z similar to 0.7 selected to lie a factor of 3-10 below the star-forming sequence at this redshift, drawn from the Large Early Galaxy Astrophysics Census survey. We significantly detect half the sample, finding molecular gas fractions less than or similar to 0.1. We show that the molecular and stellar rotational axes are broadly consistent, arguing that the molecular gas was not accreted after the galaxies became quiescent. We find that scaling relations extrapolated from the star-forming population overpredict both the gas fraction and gas depletion time for passive objects, suggesting the existence of either a break or large increase in scatter in these relations at low specific star formation rate. Finally, we show that the gas fractions of the passive galaxies we have observed at intermediate redshifts are naturally consistent with evolution into local, massive early-type galaxies by continued low-level star formation, with no need for further gas accretion or dynamical stabilization of the gas reservoirs in the intervening 6 billion years.},
  articleno    = {103},
  author       = {Spilker, Justin and Bezanson, Rachel and Barisic, Ivana and Bell, Eric and Lagos, Claudia del P and Maseda, Michael and Muzzin, Adam and Pacifici, Camilla and Sobral, David and Straatman, Caroline and van der Wel, Arjen and van Dokkum, Pieter and Weiner, Benjamin and Whitaker, Katherine and Williams, Christina C and Wu, Po-Feng},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {STAR-FORMING GALAXIES,ACTIVE GALACTIC NUCLEI,SIMILAR-TO 1,EAGLE,SIMULATIONS,ATLAS(3D) PROJECT,CONVERSION FACTOR,STELLAR MASS,FORMATION HISTORIES,FORMATION RATES,MAIN-SEQUENCE,galaxies: evolution,galaxies: high-redshift,galaxies: ISM},
  language     = {eng},
  number       = {2},
  pages        = {17},
  title        = {Molecular gas contents and scaling relations for massive, passive galaxies at intermediate redshifts from the LEGA-C Survey},
  url          = {http://dx.doi.org/10.3847/1538-4357/aac438},
  volume       = {860},
  year         = {2018},
}

Altmetric
View in Altmetric
Web of Science
Times cited: