Reverberation Mapping of the Gamma-Ray Loud Narrow-Line Seyfert 1 Galaxy 1h 0323+342

Abstract

Recently, 1H 0323+342 has attracted a lot of attention as one of several narrow-line Seyfert 1 galaxies detected in the γ-ray band. To understand their central energy engines and jet phenomena, the black hole mass is important. We made use of the Lijiang 2.4 m Telescope to monitor 1H 0323+342 for more than two months. This galaxy is one of the candidates for a monitoring project of super-Eddington accreting massive black holes. The reverberation mapping shows that Hβ emission has a delayed response of -+ 14.8 2.7 3.9 days with respect to the SDSS g′ light curve in the rest frame. The optical Fe II variations were detected after subtracting host contaminations, and a reverberation with a delay of -+ 15.2 4.1 7.4 days was found in the rest frame. By assuming the viral factor f BLR = 6.17 for the broadline region (BLR) velocity characterized by FWHM because of the face-on orientation, we find that the black hole mass derived from Hβ is =-, and the accretion rate is M = -+ 1.11 0.47• is the mass accretion rate, L Edd is the Eddington luminosity, and c is the speed of light. This black hole is one order less massive than that given by the Magorrian relation from the bulge mass. We test the relation between accretion rates and radio-loudnesses in all mapped radio-loud active galactic nuclei, and find that 1H 0323+342 falls within this group.

Mapping the Narrow-Line Seyfert 1 Galaxy 1H 0323+342

“…The size of the BLR is about 15 light days (3.9 × 10 16 cm or 0.013 pc), as derived from the measurements of Hβ and Fe II reverberation mapping (15 +4 −3 and 15 +7 −4 light days, respectively) [13]. This size is consistent with the expected external radius of the accretion disk (∼ 10 4 r g , [20]).…”

“…The estimate of the mass of the central black hole in narrow-line Seyfert 1 Galaxies is at the center of a long-standing debate (see [10] and references therein for the latest information). In the case of J0324 + 3410, the values are of the order of 10 7 M ( [1,2,11,13,12]), with two exceptions [9,14]. The available values and adopted methods are summarised in Table 1.…”

Interpretation of Departure from the Broad-line Region Scaling in Active Galactic Nuclei

“…• A confirmation of the new reverberation measurements for the outliers from the Bentz et al (2013) relationship at low/moderate Eddington ratios is strongly required. Du et al (2014Du et al ( , 2015Du et al ( , 2016Du et al ( , 2018, 3: Lu et al (2016), 4: Wang et al (2016), 5: Bentz et al (2013)…”

Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies

“…1H 0323+342 = J0324 is the closest γ NLS1. Hosted by a spiral galaxy or an interacting late-type galaxy (Zhou et al 2007;Antón et al 2008;León Tavares et al 2014) with a BH mass from reverberation mapping of 3.4×10 7 M (Wang et al 2016), this NLS1 has the lowest γ ray luminosity of the sample, but because of its short distance it was detected by Fermi soon after its launch (Abdo et al 2009c). This object was detected in hard X-rays for the first time by INTEGRAL (Bird et al 2007;Malizia et al 2007), but it was classified as a regular Seyfert.…”