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Changing look AGN Mrk 590: broad-line region and black hole mass from photometric reverberation mapping

2021; Oxford University Press; Volume: 508; Issue: 4 Linguagem: Inglês

10.1093/mnras/stab2909

1365-2966

Amit Kumar Mandal, Malte Schramm, Suvendu Rakshit, C. S. Stalin, Bovornpratch Vijarnwannaluk, W. Rujopakarn, S. Poshyachinda, Vladimir Kouprianov, J. Haislip, D. Reichart, R. Sagar, Blesson Mathew,

Plant Water Relations and Carbon Dynamics

We present the results of photometric reverberation mapping observations on the changing look active galactic nucleus Mrk 590 at z = 0.026. The observations were carried out from July to December, 2018 using broad band B, R and narrow band H{\alpha} and S II filters. B-band traces the continuum emission from the accretion disk, R-band encompasses both the continuum emission from the accretion disk and the redshifted H{\alpha} line from the broad line region (BLR), S II band contains the redshifted H{\alpha} emission and the H{\alpha} band traces the continuum emission underneath the S II band. All the light curves showed strong variation with a fractional root-mean-square variation of 0.132 (+/-) 0.001 in B-band and 0.321 (+/-) 0.001 in H{\alpha} line. From cross-correlation function analysis, we obtained a delayed response of H{\alpha} line emission to the optical B-band continuum emission of 21.44(+1.49/-2.11) days in the rest-frame of the source, corresponding to a linear size of the BLR of 0.018 pc. This is consistent with previous estimates using H{\beta}. By combining the BLR size with the H{\alpha} line full width at half maximum of 6478 (+/-) 240 km/s measured from a single-epoch spectrum obtained with the Subaru telescope, we derived a black hole mass of 1.96 (+0.15 / -0.21) X 10^8 Msun.