M. Sun
Evolution in the Black Hole-Galaxy Scaling Relations and the Duty Cycle of Nuclear Activity in Star-forming Galaxies
Sun, M.; Trump, J.R.; Brandt, W.N.; Luo, B.; Alexander, D.M.; Jahnke, K.; Rosario, D.J.; Wang, S.X.; Xue, Y.Q.
Authors
J.R. Trump
W.N. Brandt
B. Luo
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
K. Jahnke
D.J. Rosario
S.X. Wang
Y.Q. Xue
Abstract
We measure the location and evolutionary vectors of 69 Herschel-detected broad-line active galactic nuclei (BLAGNs) in the M M - * BH plane. BLAGNs are selected from the COSMOS and CDF-S fields, and span the redshift range 0.2 2. ⩽ z < 1. Black hole masses are calculated using archival spectroscopy and single-epoch virial mass estimators, and galaxy total stellar masses are calculated by fitting the spectral energy distribution (subtracting the BLAGN component). The mass-growth rates of both the black hole and galaxy are calculated using Chandra/XMM-Newton X-ray and Herschel far-infrared data, reliable measures of the BLAGN accretion and galaxy star formation rates, respectively. We use Monte Carlo simulations to account for biases in our sample, due to both selection limits and the steep slope of the massive end of the galaxy stellar-mass distribution. We find our sample is consistent with no evolution in the M M - * BH relation from z ∼ 2 to z ∼ 0. BLAGNs and their host galaxies which lie off the black hole mass–galaxy total stellar mass relation tend to have evolutionary vectors anticorrelated with their mass ratios: that is, galaxies with over-massive (under-massive) black holes tend to have a low (high) ratio of the specific accretion rate to the specific star formation rate. We also use the measured growth rates to estimate the preferred AGN duty cycle for our galaxies to evolve most consistently onto the local M M BH Bul - relation. Under reasonable assumptions of exponentially declining star formation histories, the data suggest a non-evolving (no more than a factor of a few) BLAGN duty cycle among star-forming galaxies of ∼10% (1σ range of 1–42% at z < 1 and 2–34% at z > 1).
Citation
Sun, M., Trump, J., Brandt, W., Luo, B., Alexander, D., Jahnke, K., …Xue, Y. (2015). Evolution in the Black Hole-Galaxy Scaling Relations and the Duty Cycle of Nuclear Activity in Star-forming Galaxies. Astrophysical Journal, 802(1), Article 14. https://doi.org/10.1088/0004-637x/802/1/14
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 2, 2015 |
Publication Date | Mar 20, 2015 |
Deposit Date | May 15, 2015 |
Publicly Available Date | May 20, 2015 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 802 |
Issue | 1 |
Article Number | 14 |
DOI | https://doi.org/10.1088/0004-637x/802/1/14 |
Keywords | Cosmology: observations, Galaxies: active, Galaxies: evolution, Quasars: emission lines. |
Related Public URLs | http://adsabs.harvard.edu/abs/2015ApJ...802...14S |
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Copyright Statement
© 2015. The American Astronomical Society. All rights reserved.
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