Adonis A. Sanchez, Amy E. Reines, Akos Bogdan, Ralph P. Kraft
{"title":"A Deeper Look into eFEDS AGN Candidates in Dwarf Galaxies with Chandra","authors":"Adonis A. Sanchez, Amy E. Reines, Akos Bogdan, Ralph P. Kraft","doi":"arxiv-2409.04514","DOIUrl":null,"url":null,"abstract":"The ability to accurately discern active massive black holes (BHs) in nearby\ndwarf galaxies is paramount to understanding the origins and processes of\n\"seed\" BHs in the early Universe. We present Chandra X-ray Observatory\nobservations of a sample of three local dwarf galaxies (M$_{*}$ $\\leqslant 3\n\\times 10^{9}$ M$_\\odot$, z $\\leqslant$ 0.15) previously identified as\ncandidates for hosting active galactic nuclei (AGN). The galaxies were selected\nfrom the NASA-Sloan Atlas (NSA) with spatially coincident X-ray detections in\nthe eROSITA Final Equatorial Depth Survey (eFEDS). Our new Chandra data reveal\nthree X-ray point sources in two of the target galaxies with luminosities\nbetween log(L$_{\\rm \\text{2-10 keV}}$ [erg s$^{-1}$]) = 39.1 and 40.4. Our\nresults support the presence of an AGN in these two galaxies and a ULX in one\nof them. For the AGNs, we estimate BH masses of $M_{\\rm BH} \\sim 10^{5-6}\nM_\\odot$ and Eddington ratios on the order of $\\sim 10^{-3}$.","PeriodicalId":501343,"journal":{"name":"arXiv - PHYS - High Energy Astrophysical Phenomena","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - High Energy Astrophysical Phenomena","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.04514","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The ability to accurately discern active massive black holes (BHs) in nearby
dwarf galaxies is paramount to understanding the origins and processes of
"seed" BHs in the early Universe. We present Chandra X-ray Observatory
observations of a sample of three local dwarf galaxies (M$_{*}$ $\leqslant 3
\times 10^{9}$ M$_\odot$, z $\leqslant$ 0.15) previously identified as
candidates for hosting active galactic nuclei (AGN). The galaxies were selected
from the NASA-Sloan Atlas (NSA) with spatially coincident X-ray detections in
the eROSITA Final Equatorial Depth Survey (eFEDS). Our new Chandra data reveal
three X-ray point sources in two of the target galaxies with luminosities
between log(L$_{\rm \text{2-10 keV}}$ [erg s$^{-1}$]) = 39.1 and 40.4. Our
results support the presence of an AGN in these two galaxies and a ULX in one
of them. For the AGNs, we estimate BH masses of $M_{\rm BH} \sim 10^{5-6}
M_\odot$ and Eddington ratios on the order of $\sim 10^{-3}$.
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