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The Eddington Ratio Distribution of Narrow-line Active Galactic Nuclei
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DOI：10.3847/1538-3881/ae5a1e.png)
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Abstract
En 中文
We measure the Eddington ratio distribution of local optical narrow-line active galactic nuclei (AGN) as a function of host galaxy properties, as a potential test of galaxy formation theories of AGN feedback. We extract central emission-line fluxes using data from the Mapping Nearby Galaxies at APO (MaNGA) sample of the Sloan Digital Sky Survey IV Data Release 17. Using the line ratio diagnostic techniques of X. Ji & R. Yan, we identify AGN galaxies and determine their H beta and [O iii] line luminosities. For all galaxies not identified as AGN, we determine the threshold line luminosity they would have needed to be identified as AGN. These luminosity thresholds allow us to account for selection effects that otherwise would lead to strongly biased results. From the H beta luminosities and luminosity detection thresholds, accounting for selection effects, we measure the luminosity and Eddington ratio distributions of Seyferts as a function of specific star formation rate (sSFR) and stellar mass. Defining F-AGN as the occurrence rate of AGN above a fixed Eddington ratio of 10(-3), we find that F-AGN is constant or increasing with stellar mass for star-forming galaxies and declines strongly with stellar mass for quiescent galaxies. At stellar masses log 10 M- * > 10.25 , the occurrence rate increases monotonically with sSFR. At low statistical significance, in our lowest mass bins 9.25 < log(10) M- * < 10.25 , F-AGN peaks at intermediate sSFR. These patterns reveal a complicated dependence of AGN activity on galaxy properties for theoretical models to explain.
Keywords:
SDSS-IV MANGA
DIGITAL SKY SURVEY
SUPERMASSIVE BLACK-HOLES
DATA-ANALYSIS PIPELINE
STAR-FORMING GALAXIES
OBSERVATIONAL EVIDENCE
NEARBY GALAXIES
FORMATION RATES
AGN
HOST
Journal
IF:
5.1
Papers:
1.4W
Citations:
5.0W
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