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| Paper: |
The Behavior of Star Formation in z ∼ 0.7 Galaxies |
| Volume: |
446, Galaxy Evolution: Infrared to Millimeter Wavelength Perspective |
| Page: |
145 |
| Authors: |
Guo, K.; Zheng, X. Z.; Fu, H. |
| Abstract: |
Using a sample of ∼10,000 star-forming galaxies with 0.6<z<0.8 from COSMOS, we examine the scatter of the galaxy star formation rate (SFR) and stellar mass correlation. The SFR is estimated from ultraviolet and infrared luminosities. We use stacking to derive the average 24 μm fluxes for 24 μm-undetected galaxies. Our results show that the scatter of the SFR-stellar mass relation is ∼0.25 dex, and of likely weak dependence on stellar mass. The SFR distributions for galaxies of similar stellar masses are characterized by an extended wing at the high end dominated by galaxies in the burst phase (SFR/M* >0.3 Gyr-1). The burst phase involves 10-20% of galaxies in number (duty cycle) and 10-40% of the integrated SFR, depending on stellar mass. The integrated SFR in all bursts, induced by major/minor mergers and/or interactions, contributes 30% of the overall SFR, suggesting that “quiescent” processes regulate SF in galaxies at the epoch examined. |
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