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An empirical relation to estimate host galaxy stellar light from AGN spectra

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dc.contributor.author Jalan, Priyanka
dc.contributor.author Rakshit, Suvendu
dc.contributor.author Woo, Jong-Jak
dc.contributor.author Kotilainen, Jari
dc.contributor.author Stalin, C. S.
dc.date.accessioned 2024-03-07T08:51:11Z
dc.date.available 2024-03-07T08:51:11Z
dc.date.issued 2023-05
dc.identifier.uri https://doi.org/10.1093/mnrasl/slad014
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1505
dc.description.abstract Measurement of black hole mass for low-z (z≤ 0.8) Active Galactic Nuclei (AGNs) is difficult due to the strong contribution from host galaxy stellar light necessitating detailed spectral decomposition to estimate the AGN luminosity. Here, we present an empirical relation to estimate host galaxy stellar luminosity from the optical spectra of AGNs at z ≤ 0.8. The spectral data were selected from the fourteenth data release of the Sloan Digital Sky Survey (SDSS-DR14) quasar catalogue having a signal-to-noise ratio at 5100 Å (SNR5100) >10 containing 11 415 quasars. The median total luminosity (log (Ltotal/[erg s−1])), stellar luminosity (log (Lstar/[erg s−1])), and AGN continuum luminosity ((log Lcont/[erg s−1])) in our sample are 44.52, 44.06, and 44.30, respectively. We fit the AGN power-law continuum, host galaxy, and iron blend contribution, simultaneously over the entire available spectrum. We found the host galaxy fraction to anticorrelate with continuum luminosity and can be well represented by a polynomial function, which can be used to correct the stellar light contribution from AGN spectra. We also found anticorrelation between host galaxy fraction and iron strength, Eddington ratio, and redshift. The empirical relation gives comparable results of host-fraction with the image decomposition method. en_US
dc.language.iso en en_US
dc.publisher Monthly Notices of the Royal Astronomical Society Letters en_US
dc.relation.ispartofseries 1960;mnl521-11
dc.subject data analysis en_US
dc.subject galaxies: active en_US
dc.subject methods: statistical en_US
dc.title An empirical relation to estimate host galaxy stellar light from AGN spectra en_US
dc.type Article en_US


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