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Chaves-Montero, Jonás; Bonoli, Silvia; Trakhtenbrot, Benny; Fernández-Centeno, Alejandro; Queiroz, Carolina; Díaz-García, Luis A; González Delgado, Rosa María; Hernán-Caballero, Antonio; Hernández-Monteagudo, Carlos; Lópen-Sanjuan, Carlos; Overzier, Roderik; Sobral, David; Abramo, L Raul; Alcaniz, Jailson; Benitez, Narciso; Carneiro, Saulo; Cenarro, A Javier; Cristóbal-Hornillos, David; Dupke, Renato A; Ederoclite, Alessandro; Marín-Franch, Antonio; Mendes de Oliveira, Claudia; Moles, Mariano; Laerte Sodré Jr; Taylor, Keith; Varela, Jesús; Héctor Vázquez Ramió; Civera, Tamara
arXiv.org, 02/2022Paper, Journal Article
Precise measurements of black hole masses are essential to understanding the coevolution of these sources and their host galaxies. We develop a novel approach for computing black hole virial masses using measurements of continuum luminosities and emission line widths from partially overlapping, narrow-band observations of quasars; we refer to this technique as single-epoch photometry. This novel method relies on forward-modelling quasar observations for estimating emission line widths, which enables unbiased measurements even for lines coarsely resolved by narrow-band data. We assess the performance of this technique using quasars from the Sloan Digital Sky Survey (SDSS) observed by the miniJPAS survey, a proof-of-concept project of the Javalambre Physics of the Accelerating Universe Astrophysical Survey (J-PAS) collaboration covering \(\simeq1\,\mathrm{deg}^2\) of the northern sky using the 56 J-PAS narrow-band filters. We find remarkable agreement between black hole masses from single-epoch SDSS spectra and single-epoch miniJPAS photometry, with no systematic difference between these and a scatter ranging from 0.4 to 0.07 dex for masses from \(\log(M_\mathrm{BH})\simeq8\) to 9.75, respectively. Reverberation mapping studies show that single-epoch masses present approximately 0.4 dex precision, letting us conclude that our novel technique delivers black hole masses with only mildly lower precision than single-epoch spectroscopy. The J-PAS survey will soon start observing thousands of square degrees without any source preselection other than the photometric depth in the detection band, and thus single-epoch photometry has the potential to provide details on the physical properties of quasar populations that do not satisfy the preselection criteria of previous spectroscopic surveys.
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