The dependence of star formation on galaxy stellar mass

Xian Zhong Zheng, Eric F. Bell, Casey Papovich, Christian Wolf, Klaus Meisenheimer, Hans Walter Rix, George H. Rieke, Rachel Somerville

Research output: Contribution to journalArticle

136 Citations (Scopus)

Abstract

We combine Spitzer 24 μm observations with data from the COMBO-17 survey for ∼15,000 0.2 < z ≤ 1 galaxies to determine how the average star formation rates (SFRs) have evolved for galaxy subpopulations of different stellar masses. In the determination of 〈SFR〉, we consider both the ultraviolet (UV) and the infrared (IR) luminosities, and account for the contributions of galaxies that are individually undetected at 24 μm through image stacking. For all redshifts, we find that higher mass galaxies have a substantially lower specific SFR, 〈SFR〉/〈M〉, than lower mass ones. However, we find the striking result that the rate of decline in cosmic SFR with redshift is nearly the same for massive and low mass galaxies, i.e., not a strong function of stellar mass. This analysis confirms one version of what has been referred to as "downsizing," namely, that the epoch of major mass buildup in massive galaxies is substantially earlier than the epoch of mass buildup in low-mass galaxies. Yet it shows that star formation activity is not becoming increasingly limited to low-mass galaxies toward the present epoch. We argue that this suggests that heating by AGN-powered radio jets is not the dominant mechanism responsible for the decline in cosmic SFR since z ∼ 1, which is borne out by comparison with semianalytic models that include this effect.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume661
Issue number1 II
DOIs
StatePublished - May 20 2007

Fingerprint

stellar mass
star formation
star formation rate
galaxies
time measurement
rate
subpopulation
stacking
luminosity
radio
heating

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: general

Cite this

Zheng, X. Z., Bell, E. F., Papovich, C., Wolf, C., Meisenheimer, K., Rix, H. W., ... Somerville, R. (2007). The dependence of star formation on galaxy stellar mass. Astrophysical Journal, 661(1 II). https://doi.org/10.1086/518690
Zheng, Xian Zhong ; Bell, Eric F. ; Papovich, Casey ; Wolf, Christian ; Meisenheimer, Klaus ; Rix, Hans Walter ; Rieke, George H. ; Somerville, Rachel. / The dependence of star formation on galaxy stellar mass. In: Astrophysical Journal. 2007 ; Vol. 661, No. 1 II.
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Zheng, XZ, Bell, EF, Papovich, C, Wolf, C, Meisenheimer, K, Rix, HW, Rieke, GH & Somerville, R 2007, 'The dependence of star formation on galaxy stellar mass', Astrophysical Journal, vol. 661, no. 1 II. https://doi.org/10.1086/518690

The dependence of star formation on galaxy stellar mass. / Zheng, Xian Zhong; Bell, Eric F.; Papovich, Casey; Wolf, Christian; Meisenheimer, Klaus; Rix, Hans Walter; Rieke, George H.; Somerville, Rachel.

In: Astrophysical Journal, Vol. 661, No. 1 II, 20.05.2007.

Research output: Contribution to journalArticle

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AU - Zheng, Xian Zhong

AU - Bell, Eric F.

AU - Papovich, Casey

AU - Wolf, Christian

AU - Meisenheimer, Klaus

AU - Rix, Hans Walter

AU - Rieke, George H.

AU - Somerville, Rachel

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AB - We combine Spitzer 24 μm observations with data from the COMBO-17 survey for ∼15,000 0.2 < z ≤ 1 galaxies to determine how the average star formation rates (SFRs) have evolved for galaxy subpopulations of different stellar masses. In the determination of 〈SFR〉, we consider both the ultraviolet (UV) and the infrared (IR) luminosities, and account for the contributions of galaxies that are individually undetected at 24 μm through image stacking. For all redshifts, we find that higher mass galaxies have a substantially lower specific SFR, 〈SFR〉/〈M〉, than lower mass ones. However, we find the striking result that the rate of decline in cosmic SFR with redshift is nearly the same for massive and low mass galaxies, i.e., not a strong function of stellar mass. This analysis confirms one version of what has been referred to as "downsizing," namely, that the epoch of major mass buildup in massive galaxies is substantially earlier than the epoch of mass buildup in low-mass galaxies. Yet it shows that star formation activity is not becoming increasingly limited to low-mass galaxies toward the present epoch. We argue that this suggests that heating by AGN-powered radio jets is not the dominant mechanism responsible for the decline in cosmic SFR since z ∼ 1, which is borne out by comparison with semianalytic models that include this effect.

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Zheng XZ, Bell EF, Papovich C, Wolf C, Meisenheimer K, Rix HW et al. The dependence of star formation on galaxy stellar mass. Astrophysical Journal. 2007 May 20;661(1 II). https://doi.org/10.1086/518690