ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments

A. G. Noble, M. McDonald, A. Muzzin, J. Nantais, G. Rudnick, E. Van Kampen, T. M.A. Webb, G. Wilson, H. K.C. Yee, K. Boone, M. C. Cooper, A. DeGroot, A. Delahaye, R. Demarco, R. Foltz, B. Hayden, C. Lidman, A. Manilla-Robles, S. Perlmutter

Resultado de la investigación: Contribución a la publicaciónArticle

Resumen

We present ALMA CO (2-1) detections in 11 gas-rich cluster galaxies at z ∼ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived from the Spitzer Adaptation of the Red-sequence Cluster Survey. We augment the >5σ detections of the CO (2-1) fluxes with multi-band photometry, yielding stellar masses and infrared-derived star formation rates, to place some of the first constraints on molecular gas properties in z ∼ 1.6 cluster environments. We measure sizable gas reservoirs of 0.5-2 × 1011 M in these objects, with high gas fractions (f gas) and long depletion timescales (τ), averaging 62% and 1.4 Gyr, respectively. We compare our cluster galaxies to the scaling relations of the coeval field, in the context of how gas fractions and depletion timescales vary with respect to the star-forming main sequence. We find that our cluster galaxies lie systematically off the field scaling relations at z = 1.6 toward enhanced gas fractions, at a level of ∼4σ, but have consistent depletion timescales. Exploiting CO detections in lower-redshift clusters from the literature, we investigate the evolution of the gas fraction in cluster galaxies, finding it to mimic the strong rise with redshift in the field. We emphasize the utility of detecting abundant gas-rich galaxies in high-redshift clusters, deeming them as crucial laboratories for future statistical studies.

Idioma originalEnglish
Número de artículoL21
PublicaciónAstrophysical Journal Letters
Volumen842
Número de edición2
Identificadores de objetos digitales
EstadoPublished - 20 jun 2017

Huella dactilar

gas
gases
galaxies
depletion
timescale
molecular gases
scaling
star formation rate
stellar mass
photometry
stars

Keywords

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Citar esto

    Noble, A. G.; McDonald, M.; Muzzin, A.; Nantais, J.; Rudnick, G.; Van Kampen, E.; Webb, T. M.A.; Wilson, G.; Yee, H. K.C.; Boone, K.; Cooper, M. C.; DeGroot, A.; Delahaye, A.; Demarco, R.; Foltz, R.; Hayden, B.; Lidman, C.; Manilla-Robles, A.; Perlmutter, S. / ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters : Evidence for Higher Gas Fractions in High-density Environments.

    En: Astrophysical Journal Letters, Vol. 842, N.º 2, L21, 20.06.2017.

    Resultado de la investigación: Contribución a la publicaciónArticle

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    title = "ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments",
    abstract = "We present ALMA CO (2-1) detections in 11 gas-rich cluster galaxies at z ∼ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived from the Spitzer Adaptation of the Red-sequence Cluster Survey. We augment the >5σ detections of the CO (2-1) fluxes with multi-band photometry, yielding stellar masses and infrared-derived star formation rates, to place some of the first constraints on molecular gas properties in z ∼ 1.6 cluster environments. We measure sizable gas reservoirs of 0.5-2 × 1011 M in these objects, with high gas fractions (f gas) and long depletion timescales (τ), averaging 62% and 1.4 Gyr, respectively. We compare our cluster galaxies to the scaling relations of the coeval field, in the context of how gas fractions and depletion timescales vary with respect to the star-forming main sequence. We find that our cluster galaxies lie systematically off the field scaling relations at z = 1.6 toward enhanced gas fractions, at a level of ∼4σ, but have consistent depletion timescales. Exploiting CO detections in lower-redshift clusters from the literature, we investigate the evolution of the gas fraction in cluster galaxies, finding it to mimic the strong rise with redshift in the field. We emphasize the utility of detecting abundant gas-rich galaxies in high-redshift clusters, deeming them as crucial laboratories for future statistical studies.",
    keywords = "Clusters, Galaxies, Galaxies: evolution, Galaxies: high-redshift, Galaxies: ISM, Galaxies: star formation, General, Infrared: galaxies",
    author = "Noble, {A. G.} and M. McDonald and A. Muzzin and J. Nantais and G. Rudnick and {Van Kampen}, E. and Webb, {T. M.A.} and G. Wilson and Yee, {H. K.C.} and K. Boone and Cooper, {M. C.} and A. DeGroot and A. Delahaye and R. Demarco and R. Foltz and B. Hayden and C. Lidman and A. Manilla-Robles and S. Perlmutter",
    year = "2017",
    month = "6",
    doi = "10.3847/2041-8213/aa77f3",
    volume = "842",
    journal = "Astrophysical Journal Letters",
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    Noble, AG, McDonald, M, Muzzin, A, Nantais, J, Rudnick, G, Van Kampen, E, Webb, TMA, Wilson, G, Yee, HKC, Boone, K, Cooper, MC, DeGroot, A, Delahaye, A, Demarco, R, Foltz, R, Hayden, B, Lidman, C, Manilla-Robles, A & Perlmutter, S 2017, 'ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments' Astrophysical Journal Letters, vol. 842, n.º 2, L21. DOI: 10.3847/2041-8213/aa77f3

    ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters : Evidence for Higher Gas Fractions in High-density Environments. / Noble, A. G.; McDonald, M.; Muzzin, A.; Nantais, J.; Rudnick, G.; Van Kampen, E.; Webb, T. M.A.; Wilson, G.; Yee, H. K.C.; Boone, K.; Cooper, M. C.; DeGroot, A.; Delahaye, A.; Demarco, R.; Foltz, R.; Hayden, B.; Lidman, C.; Manilla-Robles, A.; Perlmutter, S.

    En: Astrophysical Journal Letters, Vol. 842, N.º 2, L21, 20.06.2017.

    Resultado de la investigación: Contribución a la publicaciónArticle

    TY - JOUR

    T1 - ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters

    T2 - Astrophysical Journal Letters

    AU - Noble,A. G.

    AU - McDonald,M.

    AU - Muzzin,A.

    AU - Nantais,J.

    AU - Rudnick,G.

    AU - Van Kampen,E.

    AU - Webb,T. M.A.

    AU - Wilson,G.

    AU - Yee,H. K.C.

    AU - Boone,K.

    AU - Cooper,M. C.

    AU - DeGroot,A.

    AU - Delahaye,A.

    AU - Demarco,R.

    AU - Foltz,R.

    AU - Hayden,B.

    AU - Lidman,C.

    AU - Manilla-Robles,A.

    AU - Perlmutter,S.

    PY - 2017/6/20

    Y1 - 2017/6/20

    N2 - We present ALMA CO (2-1) detections in 11 gas-rich cluster galaxies at z ∼ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived from the Spitzer Adaptation of the Red-sequence Cluster Survey. We augment the >5σ detections of the CO (2-1) fluxes with multi-band photometry, yielding stellar masses and infrared-derived star formation rates, to place some of the first constraints on molecular gas properties in z ∼ 1.6 cluster environments. We measure sizable gas reservoirs of 0.5-2 × 1011 M in these objects, with high gas fractions (f gas) and long depletion timescales (τ), averaging 62% and 1.4 Gyr, respectively. We compare our cluster galaxies to the scaling relations of the coeval field, in the context of how gas fractions and depletion timescales vary with respect to the star-forming main sequence. We find that our cluster galaxies lie systematically off the field scaling relations at z = 1.6 toward enhanced gas fractions, at a level of ∼4σ, but have consistent depletion timescales. Exploiting CO detections in lower-redshift clusters from the literature, we investigate the evolution of the gas fraction in cluster galaxies, finding it to mimic the strong rise with redshift in the field. We emphasize the utility of detecting abundant gas-rich galaxies in high-redshift clusters, deeming them as crucial laboratories for future statistical studies.

    AB - We present ALMA CO (2-1) detections in 11 gas-rich cluster galaxies at z ∼ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived from the Spitzer Adaptation of the Red-sequence Cluster Survey. We augment the >5σ detections of the CO (2-1) fluxes with multi-band photometry, yielding stellar masses and infrared-derived star formation rates, to place some of the first constraints on molecular gas properties in z ∼ 1.6 cluster environments. We measure sizable gas reservoirs of 0.5-2 × 1011 M in these objects, with high gas fractions (f gas) and long depletion timescales (τ), averaging 62% and 1.4 Gyr, respectively. We compare our cluster galaxies to the scaling relations of the coeval field, in the context of how gas fractions and depletion timescales vary with respect to the star-forming main sequence. We find that our cluster galaxies lie systematically off the field scaling relations at z = 1.6 toward enhanced gas fractions, at a level of ∼4σ, but have consistent depletion timescales. Exploiting CO detections in lower-redshift clusters from the literature, we investigate the evolution of the gas fraction in cluster galaxies, finding it to mimic the strong rise with redshift in the field. We emphasize the utility of detecting abundant gas-rich galaxies in high-redshift clusters, deeming them as crucial laboratories for future statistical studies.

    KW - Clusters

    KW - Galaxies

    KW - Galaxies: evolution

    KW - Galaxies: high-redshift

    KW - Galaxies: ISM

    KW - Galaxies: star formation

    KW - General

    KW - Infrared: galaxies

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    U2 - 10.3847/2041-8213/aa77f3

    DO - 10.3847/2041-8213/aa77f3

    M3 - Article

    VL - 842

    JO - Astrophysical Journal Letters

    JF - Astrophysical Journal Letters

    SN - 2041-8205

    IS - 2

    M1 - L21

    ER -