2022MNRAS.512L..33V

2022MNRAS.512L..33V - Mon. Not. R. Astron. Soc., 512, L33-L38 (2022/May-1)

The luminosity-dependent contribution from the broad-line region to the wavelength-dependent lags in Mrk 110.

VINCENTELLI F.M., McHARDY I., HERNANDEZ SANTISTEBAN J.V., CACKETT E.M., GELBORD J., HORNE K., MILLER J.A. and LOBBAN A.

We have measured the wavelength-dependent lags between the X-ray, ultraviolet, and optical bands in the high-accretion rate (L/L_Edd~40 per cent) active galactic nucleus (AGN) Mrk 110 during two intensive monitoring campaigns in February and September 2019. After including the 2017 data published by Vincentelli et al., we divided the observations into three intervals with different X-ray luminosities. The first interval has the lowest X-ray luminosity and did not exhibit the U-band excess positive lag, or the X-ray excess negative lag that is seen in most AGNs. However, these excess lags are seen in the two subsequent intervals of higher X-ray luminosity. Although the data are limited, the excess lags appear to scale with X-ray luminosity. Our modelling shows that lags expected from reprocessing of X-rays by the accretion disc vary hardly at all with increasing luminosity. Therefore, as the U-band excess almost certainly arises from Balmer-continuum emission from the broad-line region (BLR), we attribute these lag changes to changes in the contribution from the BLR. The change is easily explained by the usual increase in the inner radius of the BLR with increasing ionizing luminosity.

Journal keyword(s): accretion: accretion discs - galaxies: active - galaxies: individual: Mrk 110

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	Mrk 110	Sy1	09 25 12.8479065576	+52 17 10.386311208		16.82	16.41			~	681	1

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`Mrk 110`	`PG 0921+52`	`SRGA J092514.1+521654`	`[FS2003] 0510`
`1ES 0921+52.5`	`QSO B0921+525`	`SWIFT J0925.0+5218`	`[HB91] 0921+525`
`FIRST J092512.8+521710`	`RBS 773`	`SWIFT J0924.8+5216`	`[HSN2016] J141.30+52.28`
`IGR J09251+5219`	`1RXP J092512.8+521712`	`SWIFT J0925.2+5217`	`[KRL2007b] 77`
`INTREF 387`	`RX J0925.2+5217`	`SWIFT J0925.3+5216`	`[VV2000c] J092512.9+521711`
`IRAS F09213+5230`	`RX J0925.1+5217`	`TIC 457137884`	`[VV2003c] J092512.9+521711`
`KUG 0921+525`	`1RXS J092512.3+521716`	`1WGA J0925.2+5217`	`[VV2006c] J092512.9+521711`
`LEDA 26709`	`SBSG 0921+525`	`WISEA J092512.85+521710.3`	`[VV2010c] J092512.9+521711`
`2MASS J09251284+5217102`	`SDSS J092512.85+521710.5`	`WISE J092512.85+521710.5`	`[VV98c] J092512.9+521711`
`2MASX J09251286+5217102`	`SDSS J092512.84+521710.3`	`2XMM J092512.8+521711`	`[ZEH2003] RX J0925.2+5217 1`
`PBC J0925.2+5216`	`SDSS J092512.84+521710.7`	`XSS J09261+5204`	`Gaia DR2 1019788071166861952`
`PG 0921+525`	`SDSS J092512.85+521710.3`	`ZTF J092512.85+521710.4`	`Gaia DR3 1019788071166861952`

`FIRST J092512.8+521710`	`IRAS F09213+5230`	`KUG 0921+525`	`2MASS J09251284+5217102`	`2MASX J09251286+5217102`
`PG 0921+525`	`PG 0921+52`	`1RXS J092512.3+521716`	`SDSS J092512.85+521710.5`	`SDSS J092512.84+521710.3`
`SDSS J092512.84+521710.7`	`SDSS J092512.85+521710.3`	`WISEA J092512.85+521710.3`	`WISE J092512.85+521710.5`	`Gaia DR2 1019788071166861952`
`Gaia DR3 1019788071166861952`