Chandra Discovery of a Candidate Hyper-Luminous X-ray Source in MCG+11-11-032

dc.contributor.authorFoord, Adi
dc.contributor.authorCivano, Francesca
dc.contributor.authorComerford, Julia M.
dc.contributor.authorElvis, Martin
dc.contributor.authorFabbiano, Giuseppina
dc.contributor.authorLiu, Tingting
dc.contributor.authorLusso, Elisabeta
dc.contributor.authorMarchesi, Stefano
dc.contributor.authorMezcua, Mar
dc.contributor.authorMuller-Sanchez, Francisco
dc.contributor.authorNevin, Rebecca
dc.contributor.authorNyland, Kristina
dc.date.accessioned2024-10-28T14:30:40Z
dc.date.available2024-10-28T14:30:40Z
dc.date.issued2024-09-05
dc.description.abstractWe present a multi-wavelength analysis of MCG+11-11-032, a nearby AGN with the unique classification of both a binary and a dual AGN candidate. With new Chandra observations we aim to resolve any dual AGN system via imaging data, and search for signs of a binary AGN via analysis of the X-ray spectrum. Analyzing the Chandra spectrum, we find no evidence of previously suggested double-peaked Fe Kα lines; the spectrum is instead best fit by an absorbed powerlaw with a single Fe Kα line, as well as an additional line centered at ≈7.5 keV. The Chandra observation reveals faint, soft, and extended X-ray emission, possibly linked to low-level nuclear outflows. Further analysis shows evidence for a compact, hard source -- MCG+11-11-032 X2 -- located 3.27'' from the primary AGN. Modeling MCG+11-11-032 X2 as a compact source, we find that it is relatively luminous (L₂₋₁₀ ₖₑᴠ=1.52+0.96−0.48×10⁴¹ erg s⁻¹), and the location is coincident with an compact and off-nuclear source resolved in Hubble Space Telescope infrared (F105W) and ultraviolet (F621M, F547M) bands. Pairing our X-ray results with a 144 MHz radio detection at the host galaxy location, we observe X-ray and radio properties similar to those of ESO 243-49 HLX-1, suggesting that MCG+11-11-032 X2 may be a hyper-luminous X-ray source. This detection with Chandra highlights the importance of a high-resolution X-ray imager, and how previous binary AGN candidates detected with large-aperture instruments benefit from high-resolution follow-up. Future spatially resolved optical spectra, and deeper X-ray observations, can better constrain the origin of MCG+11-11-032 X2.
dc.description.sponsorshipM.M. acknowledges support from the Spanish Ministry of Science and Innovation through the project PID2021-124243NB-C22. This work was partially supported by the program Unidad de Excelencia Mar´?a de Maeztu CEX2020-001058-M. F.M-S. acknowledges support from NASA through ADAP award 80NSSC19K1096. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Basic research in radio astronomy at the U.S. Naval Research Laboratory is supported by 6.1 Base Funding.
dc.description.urihttps://arxiv.org/abs/2409.03839v1
dc.format.extent16 pages
dc.genrejournal articles
dc.genrepreprints
dc.identifierdoi:10.13016/m2bwfq-osta
dc.identifier.urihttps://doi.org/10.48550/arXiv.2409.03839
dc.identifier.urihttp://hdl.handle.net/11603/36762
dc.language.isoen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Physics Department
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rightsPublic Domain
dc.rights.urihttps://creativecommons.org/publicdomain/mark/1.0/
dc.titleChandra Discovery of a Candidate Hyper-Luminous X-ray Source in MCG+11-11-032
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0002-1616-1701

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