BASS-XL: X-ray variability properties of unobscured active galactic nuclei
Abstract
We investigate the X-ray variability properties of Seyfert 1 Galaxies belonging to the BAT AGN Spectroscopic Survey (BASS). The sample includes 151 unobscured (N-H < 10(22) cm(-2)) AGNs observed with XMM-Newton for a total exposure time of similar to 27 ms, representing the deepest variability study done so far with high signal-to-noise XMM-Newton observations, almost doubling the number of observations analysed in previous works. We constrain the relation between the normalized excess variance and the 2-10 keV AGN luminosities, black hole masses, and Eddington ratios. We find a highly significant correlation between sigma(2)(NXS) and M-BH, with a scatter of similar to 0.85 dex. For sources with high L2-10 this correlation has a lower normalization, confirming that more luminous (higher mass) AGNs show less variability. We explored the sigma(2)(NXS) versus M-BH relation for the sub-sample of sources with M-BH estimated via the 'reverberation mapping' technique, finding a tighter anticorrelation, with a scatter of similar to 0.65 dex. We examine how the sigma(2)(NXS) changes with energy by studying the relation between the variability in the hard (3-10 keV) and the soft (0.2-1 keV)/medium (1-3 keV) energy bands, finding that the spectral components dominating the hard energy band are more variable than the spectral components dominating in softer energy bands, on time-scales shorter than 10 ks.
Más información
Título según WOS: | ID WOS:001078226700006 Not found in local WOS DB |
Título de la Revista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
Volumen: | 526 |
Número: | 2 |
Editorial: | OXFORD UNIV PRESS |
Fecha de publicación: | 2023 |
Página de inicio: | 1687 |
Página final: | 1698 |
DOI: |
10.1093/mnras/stad2775 |
Notas: | ISI |