Volume 618, October 2018
|Number of page(s)||5|
|Published online||18 October 2018|
AGN mass estimates in large spectroscopic surveys: the effect of host galaxy light
Università degli Studi di Milano–Bicocca, Dipartimento di Fisica “G. Occhialini”,
Piazza della Scienza 3,
2 INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
3 INFN, Sezione di Milano–Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
Accepted: 16 March 2018
Virial–based methods for estimating active supermassive black hole masses are now commonly used on extremely large spectroscopic quasar catalogs. Most spectral analyses, though, do not pay enough attention to the detailed continuum decomposition. To understand how this affects virial mass estimates, we test the influence of host galaxy light on them, along with a Balmer continuum component. A detailed fit with the new spectroscopic analysis software QSFIT demonstrates that the presence or absence of continuum components does not significantly affect the virial-based results for our sample. Taking a host galaxy component into consideration or not, instead, affects the emission line fitting in a more pronounced way at lower redshifts, where in fact we observe dimmer quasars and more visible host galaxies.
Key words: galaxies: active / quasars: supermassive black holes / black hole physics / quasars: general
© ESO 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.