The Hα Broadband Photometric Reverberation Mapping of Four Seyfert 1 Galaxies

Ma, Qinchun; Wu, Xue-Bing; Huapeng, Gu,; Wen, Yuhan; Fu, Yuming

doi:10.3847/1538-4357/acc4c1

Cited by 5 publications

(7 citation statements)

References 72 publications

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“…Finally, we run an interpolated cross-correlation function (ICCF; e.g., Gaskell & Peterson 1987) to calculate the emission-line lag. This method has recovered H α lags for four Seyfert 1 galaxies (MCG+089 11-011, NGC 2617, 3C 120, and NGC 5548) successfully (Ma et al 2023).…”

Section: Iccf-cut Methods For Crmmentioning

confidence: 95%

“…First, we provide a brief introduction to the ICCF-Cut method. It was originally developed by Ma et al (2023) to measure the emission-line lags from broadband photometric light curves. The method provides a possible way of estimating the BLR sizes and black hole masses of a large sample of AGNs in large multi-epoch high-cadence photometric surveys.…”

Section: Iccf-cut Methods For Crmmentioning

confidence: 99%

“…We do not adopt the flux variation gradient (FVG) used in the previous ICCF-Cut paper (Ma et al 2023) for two reasons:…”

Section: Host Galaxymentioning

confidence: 99%

“…It is important to provide more direct evidence to show if there are outer components beyond accretion disks in broadband photometric light curves that have good correlations with the inner-disk variability and provide us with longer lags than the lags predicted by disk models. In this paper, we adopt a method called ICCF-Cut for CRM (see the previous application of ICCF-Cut to line emissions in Ma et al 2023). By applying this method, we decompose the light curves of the potential diffuse continuum from the Swift U band in six AGNs with high-quality, high-cadence, and multiband-monitored light curves.…”

Section: Introductionmentioning

confidence: 99%

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Evidence for an Outer Component in the Continuum Reverberation Mapping of Active Galactic Nuclei

Jiang,

Wu,

et al. 2024

ApJ

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Continuum reverberation mapping is widely used in studying the accretion disks of active galactic nuclei (AGNs). Some indirect evidence and simulations have indicated that the diffuse continuum, especially the strong Balmer continuum from the broad-line region, may contribute to the continuum in the u/U band. Here, we present direct evidence for this contribution. In this work, we apply the ICCF-Cut method to continuum reverberation mapping to extract the possible diffuse continuum light curves of six AGNs, using high-cadence, high-quality, and multiband observations. We find the existence of an outer component out of the accretion disk for each of the six AGNs in the Swift U band. Meanwhile, similar results can be derived with the JAVELIN Photometric Reverberation Mapping Model for four of them. The lags of the outer components are consistent with the predicted Balmer continuum lags, which are about half of the Hβ lag values. Our result directly reinforces the understanding that an outer component, especially the Balmer continuum in the rest-frame u/U band, can contribute significantly to the continuum reverberation lags of AGNs.

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Section: Iccf-cut Methods For Crmmentioning

confidence: 95%

Section: Iccf-cut Methods For Crmmentioning

confidence: 99%

“…We do not adopt the flux variation gradient (FVG) used in the previous ICCF-Cut paper (Ma et al 2023) for two reasons:…”

Section: Host Galaxymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evidence for an Outer Component in the Continuum Reverberation Mapping of Active Galactic Nuclei

Jiang,

Wu,

et al. 2024

ApJ

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“…In our previous work (Ma et al 2023; hereafter Paper I), we proposed the cross-correlation function (ICCF)-Cut process to remove the continuum emission and isolate the emission-line from the broadband light curves. This procedure essentially follows the continuum removal proposed by Haas et al (2011) andPozo Nuñez et al (2012) with some modifications.…”

Section: Introductionmentioning

confidence: 99%

Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry

Ma,

Wen,

et al. 2024

ApJ

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In our previous work on broadband photometric reverberation mapping (PRM), we proposed the interpolated cross-correlation function (ICCF)-Cut process to obtain the time lags of the Hα emission line from two broadband lightcurves via subtracting the continuum emission from the line band. Extending the work, we enlarge our sample to the Zwicky Transient Facility (ZTF) database. We adopt two criteria to select 123 type 1 active galactic nuclei (AGNs) with sufficient variability and smooth light curves from 3537 AGNs at z < 0.09 with more than 100 epoch observations in the g and r bands from the ZTF database. We calculate the Hα time lags for 23 of them that have previous spectroscopic reverberation mapping (SRM) results using the ICCF-Cut, Just Another Vehicle for Estimating Lags In Nuclei (JAVELIN), and χ 2 methods. Our obtained Hα time lags are slightly larger than the Hβ time lags, which is consistent with the previous SRM results and the theoretical model of the AGN broad-line region. The comparisons between the SRM and PRM lag distributions and between the subtracted emission line light curves indicate that after selecting AGNs with the two criteria, combining the ICCF-Cut, JAVELIN, and χ 2 methods provides an efficient way to get the reliable Hα lags from the broadband PRM. Such techniques can be used to estimate the black hole masses of a large sample of AGNs in large multiepoch photometric sky surveys such as the Legacy Survey of Space and Time and the survey from the Wide Field Survey Telescope in the near future.

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H α reverberation mapping from broad-band photometry of dwarf type 1 Seyfert galaxy NGC 4395

Gu,

Wu,

Wen

et al. 2024

Monthly Notices of the Royal Astronomical Society

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NGC 4395 is a dwarf Seyfert 1 galaxy with a possible intermediate-mass black hole of several $\rm {10^4}$ solar masses in its center. As a well-studied object, its broad line region size has been measured via H$\rm {\alpha }$ time lag in numerous spectroscopic reverberation mapping (SRM) and narrow-band photometric reverberation mapping (PRM) campaigns. Here we present its H$\rm {\alpha }$ time lag measurement using broad-band photometric data, with the application of our newly-developed ICCF-Cut method as well as the JAVELIN and χ2 methods. utilizing the minute-cadence multi-band light curves obtained from the $\rm {2}$m FTN and $\rm {10.4}$m GTC telescopes in recent works, we measured its H$\rm {\alpha }$ lag as approximately 40 ∼ 90 minutes from broad-band PRM. With the H$\rm {\alpha }$ emission line velocity dispersion, we calculated its central black hole mass as $\rm M_{\rm BH} = (8\pm 4) \times 10^3\, M_{\rm \odot }$. These results are comparable with previous results obtained by narrow-band PRM and SRM, providing further support to an intermediate-mass black hole in NGC 4395. In addition, our study also validates the ICCF-Cut as an effective method for broad-band PRM, which holds the potential for widespread application in the era of large multi-epoch, high-cadence photometric surveys.

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The Hα Broadband Photometric Reverberation Mapping of Four Seyfert 1 Galaxies

Cited by 5 publications

References 72 publications

Evidence for an Outer Component in the Continuum Reverberation Mapping of Active Galactic Nuclei

Evidence for an Outer Component in the Continuum Reverberation Mapping of Active Galactic Nuclei

Hα Time Delays of Active Galactic Nuclei from the Zwicky Transient Facility Broadband Photometry

H α reverberation mapping from broad-band photometry of dwarf type 1 Seyfert galaxy NGC 4395

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