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Constraints on the star formation histories of galaxies from z~1 to z~0
Yan-Mei Chen, Vivienne Wild, Guinevere Kauffmann +5
We present a new method to estimate the average star formation rate per unit stellar mass (SSFR) of a stacked population of galaxies. We combine the spectra of 600-1000 galaxies wi…
A Systematic Analysis of Fe II Emission in Quasars: Evidence for Inflow to the Central Black Hole
Chen Hu, Jian-Min Wang, Luis C. Ho +4
Broad Fe II emission is a prominent feature of the optical and ultraviolet spectra of quasars. We report on a systematical investigation of optical Fe II emission in a large sample…
The radio luminosity, black hole mass and Eddington ratio for quasars from the Sloan Digital Sky Survey
Wei-Hao. Bian, Yan-Mei. Chen, Chen. Hu +2
We investigate the $\mbh- σ_*$ relation for radio-loud quasars with redshift in Data Release 3 of the Sloan Digital Sky Survey (SDSS). The sample consists of 3772 quasars…
Early Growth of Massive Black Holes in Quasars
J. M. Wang, Y. -M. Chen, C. -S. Yan +1
Episodic activity of quasars is driving growth of supermassive black holes (SMBHs) via accretion of baryon gas. In this Letter, we develop a simple method to analyse the duty cycle…
Suppressed star formation in circumnuclear regions in Seyfert galaxies
J. -M. Wang, Y. -M. Chen, C. -S. Yan +2
Feedback from black hole activity is widely believed to play a key role in regulating star formation and black hole growth. A long-standing issue is the relation between the star f…
Cosmological Evolution of the Duty Cycle of Quasars
Jian-Min Wang, Yan-Mei Chen, Fan Zhang
Quasars are powered by accretion onto supermassive black holes, but the problem of the duty cycle related to the episodic activity of the black holes remains open as one of the maj…