Host Galaxies and the Spectral Variability of Quasars

Vagnetti, F.; Trèvese, D.

doi:10.1007/978-1-4615-0695-9_25

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Villata et al (2002Villata et al ( , 2004a argued that the BWB relation was more likely to be detected in short isolated outbursts. The BWB trend of BL Lacertae has been detected in a number of previous research (Racine 1970;Speziali & Natali 1998;Vagnetti & Trevese 2003;Stalin et al 2006;Papadakis et al 2007;Ikejiri et al 2011;Gaur et al 2015;Wierzcholska et al 2015;Meng et al 2018). Our intraday color-magnitude results consist with most of the historical observations.…”

Section: Color Variationssupporting

confidence: 87%

Intra-day variability of BL Lacertae from 2016 to 2018

Li,

Wu,

Meng

et al. 2021

Preprint

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We monitored BL Lacertae in the B, V, R and I bands for 14 nights during the period of 2016-2018. The source showed significant intraday variability on 12 nights. We performed colour-magnitude analysis and found that the source exhibited bluer-when-brighter chromatism. This bluer-when-brighter behavior is at least partly caused by the larger variation amplitude at shorter wavelength. The variations at different wavelengths are well correlated and show no inter-band time lag.

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Section: Color Variationssupporting

confidence: 87%

Intra-day variability of BL Lacertae from 2016 to 2018

Li,

Wu,

Meng

et al. 2021

Preprint

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Quasar Spectral Slope Variability in the Optical Band

Trèvese

Vagnetti

2002

ApJ

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We performed a new analysis of B and R light curves of a sample of PG quasars. We confirm the variability-redshift correlation and its explanation in terms of spectral variability, coupled with the increase of rest-frame observing frequency for quasars at high redshift. The analysis of the instantaneous spectral slope for the whole quasar samples indicates both an inter-QSO and intra-QSO variability-luminosity correlation. Numerical simulations show that the latter correlation cannot be entirely due to the addition of the host galaxy emission to a nuclear spectrum of variable luminosity but constant shape, implying a spectral variability of the nuclear component. Changes of accretion rate are also insufficient to explain the amount of spectral variation, while hot spots possibly caused by local disk instabilities can explain the observations.Comment: 20 pages, 6 figures, to appear in Ap.J., January 200

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Host Galaxies and the Spectral Variability of Quasars

Cited by 2 publications

References 11 publications

Intra-day variability of BL Lacertae from 2016 to 2018

Intra-day variability of BL Lacertae from 2016 to 2018

Quasar Spectral Slope Variability in the Optical Band

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