Broad-Line Region Characterization in Dozens of Active Galactic Nuclei Using Small-Aperture Telescopes
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Figaredo, Catalina Sobrino Chelouche, Doron Haas, Martin Ramolla, Michael Kaspi, Shai Panda, Swayamtrupta Ochmann, Martin W. Zucker, Shay Chini, Rolf Probst, Malte A. Kollatschny, Wolfram Murphy, Miguel |
| author_facet | Figaredo, Catalina Sobrino Chelouche, Doron Haas, Martin Ramolla, Michael Kaspi, Shai Panda, Swayamtrupta Ochmann, Martin W. Zucker, Shay Chini, Rolf Probst, Malte A. Kollatschny, Wolfram Murphy, Miguel |
| contents | We present the results of a nearly decade-long photometric reverberation mapping (PRM) survey of the H$α$ emission line in nearby ($0.01\lesssim z \lesssim0.05$) Seyfert-Galaxies using small ($15\,\mathrm{cm}-40\,\mathrm{cm}$) telescopes. Broad-band filters were used to trace the continuum emission, while narrow-band filters tracked the H$α$-line signal. We introduce a new PRM formalism to determine the time delay between continuum and line emission using combinations of auto- and cross-correlation functions. We obtain robust delays for 33/80 objects, allowing us to estimate the broad-line region (BLR) size. Additionally, we measure multi-epoch delays for 6 objects whose scatter per source is smaller than the scatter in the BLR size-luminosity relation. Our study enhances the existing H$α$ size-luminosity relation by adding high-quality results for 31 objects, whose nuclear luminosities were estimated using the flux-variation gradient method, resulting in a scatter of 0.26dex within our sample. The scatter reduces to 0.17dex when the 6 lowest luminosity sources are discarded, which is comparable to that found for the H$β$ line. Single-epoch spectra enable us to estimate black hole masses using the H$α$ line and derive mass accretion rates from the iron-blend feature adjacent to H$β$. A similar trend, as previously reported for the H$β$ line, is implied whereby highly accreting objects tend to lie below the size-luminosity relation of the general population. Our work demonstrates the effectiveness of small telescopes in conducting high-fidelity PRM campaigns of prominent emission lines in bright active galactic nuclei. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_07847 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Broad-Line Region Characterization in Dozens of Active Galactic Nuclei Using Small-Aperture Telescopes Figaredo, Catalina Sobrino Chelouche, Doron Haas, Martin Ramolla, Michael Kaspi, Shai Panda, Swayamtrupta Ochmann, Martin W. Zucker, Shay Chini, Rolf Probst, Malte A. Kollatschny, Wolfram Murphy, Miguel Astrophysics of Galaxies We present the results of a nearly decade-long photometric reverberation mapping (PRM) survey of the H$α$ emission line in nearby ($0.01\lesssim z \lesssim0.05$) Seyfert-Galaxies using small ($15\,\mathrm{cm}-40\,\mathrm{cm}$) telescopes. Broad-band filters were used to trace the continuum emission, while narrow-band filters tracked the H$α$-line signal. We introduce a new PRM formalism to determine the time delay between continuum and line emission using combinations of auto- and cross-correlation functions. We obtain robust delays for 33/80 objects, allowing us to estimate the broad-line region (BLR) size. Additionally, we measure multi-epoch delays for 6 objects whose scatter per source is smaller than the scatter in the BLR size-luminosity relation. Our study enhances the existing H$α$ size-luminosity relation by adding high-quality results for 31 objects, whose nuclear luminosities were estimated using the flux-variation gradient method, resulting in a scatter of 0.26dex within our sample. The scatter reduces to 0.17dex when the 6 lowest luminosity sources are discarded, which is comparable to that found for the H$β$ line. Single-epoch spectra enable us to estimate black hole masses using the H$α$ line and derive mass accretion rates from the iron-blend feature adjacent to H$β$. A similar trend, as previously reported for the H$β$ line, is implied whereby highly accreting objects tend to lie below the size-luminosity relation of the general population. Our work demonstrates the effectiveness of small telescopes in conducting high-fidelity PRM campaigns of prominent emission lines in bright active galactic nuclei. |
| title | Broad-Line Region Characterization in Dozens of Active Galactic Nuclei Using Small-Aperture Telescopes |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.07847 |