In:
The Astrophysical Journal, American Astronomical Society, Vol. 953, No. 2 ( 2023-08-01), p. 137-
Kurzfassung:
Continuum reverberation mapping probes the size scale of the optical continuum-emitting region in active galactic nuclei (AGN). Through 3 yr of multiwavelength photometric monitoring in the optical with robotic observatories, we perform continuum reverberation mapping on Mrk 876. All wave bands show large-amplitude variability and are well correlated. Slow variations in the light curves broaden the cross-correlation function (CCF) significantly, requiring detrending in order to robustly recover interband lags. We measure consistent interband lags using three techniques (CCF, JAVELIN, and PyROA), with a lag of around 13 days from u to z . These lags are longer than the expected radius of 12 days for the self-gravitating radius of the disk. The lags increase with wavelength roughly following λ 4/3 , as would be expected from thin disk theory, but the lag normalization is approximately a factor of 3 longer than expected, as has also been observed in other AGN. The lag in the i band shows an excess that we attribute to variable H α broad-line emission. A flux–flux analysis shows a variable spectrum that follows f ν ∝ λ −1/3 , as expected for a disk, and an excess in the i band that also points to strong variable H α emission in that band.
Materialart:
Online-Ressource
ISSN:
0004-637X
,
1538-4357
DOI:
10.3847/1538-4357/ace342
Sprache:
Unbekannt
Verlag:
American Astronomical Society
Publikationsdatum:
2023
ZDB Id:
2207648-7
ZDB Id:
1473835-1
SSG:
16,12