{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/h-a-reverberation-mapping-from-broad-band","title":"H$α$ Reverberation Mapping from Broad-band Photometry of Dwarf Seyfert 1 Galaxy NGC 4395","arxiv_id":"2404.11495","date":"2024-04-17","proceeding":null,"authors":["Huapeng Gu","Xue-Bing Wu","Yuhan Wen","Qinchun Ma","Hengxiao Guo"],"abstract":"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 $\\chi ^2$ 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 $40 \\sim 90$ minutes from broad-band PRM. With the H$\\rm{\\alpha}$ emission line velocity dispersion, we calculated its central black hole mass as $\\rm M_{\\rm BH} = (8\\pm4) \\times 10^3\\, M_{\\rm \\odot}$. 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.","url_abs":"https://arxiv.org/abs/2404.11495v2","url_pdf":"https://arxiv.org/pdf/2404.11495v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"h-a-reverberation-mapping-from-broad-band","repo_url":"https://github.com/photorm/iccf-cut","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}