The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission
The ultraluminous X-ray source CXO J133815.6+043255 is a strong candidate for a bona fide intermediate-mass black hole residing in the outskirts of NGC 5252. We present 22 GHz radio observations of this source obtained serendipitously in an ongoing high-frequency imaging survey of radio-quiet Active...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acf4f8 |
| _version_ | 1797670395764015104 |
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| author | Krista Lynne Smith Macon Magno Ashutosh Tripathi |
| author_facet | Krista Lynne Smith Macon Magno Ashutosh Tripathi |
| author_sort | Krista Lynne Smith |
| collection | DOAJ |
| description | The ultraluminous X-ray source CXO J133815.6+043255 is a strong candidate for a bona fide intermediate-mass black hole residing in the outskirts of NGC 5252. We present 22 GHz radio observations of this source obtained serendipitously in an ongoing high-frequency imaging survey of radio-quiet Active Galactic Nuclei (AGNs), and use this new data point to construct the broadband radio spectral energy distribution (SED). We find that the SED exhibits a spectral slope of α = −0.66 ± 0.02, consistent with a steep spectrum from optically thin synchrotron emission from an unresolved jet. We also find that the L _R / L _X ratio is approximately 10 ^−3 , inconsistent with radio-quiet AGN and many ULXs but consistent with low-luminosity AGN and radio-loud quasars. Together, these observations support the conclusion that CXO J133815.6+043255 is an intermediate-mass black hole producing a low-mass analog of radio jets seen in classical quasars. |
| first_indexed | 2024-03-11T21:00:04Z |
| format | Article |
| id | doaj.art-cc00b73ae7ff4b5497bb0621121f6139 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T21:00:04Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-cc00b73ae7ff4b5497bb0621121f61392023-09-29T21:42:30ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-019561310.3847/1538-4357/acf4f8The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio EmissionKrista Lynne Smith0https://orcid.org/0000-0001-5785-7038Macon Magno1https://orcid.org/0000-0002-1292-1451Ashutosh Tripathi2https://orcid.org/0000-0002-3960-5870George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University , College Station, TX 77843-4242, USA; Southern Methodist University , Department of Physics Dallas, TX 75205, USAGeorge P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University , College Station, TX 77843-4242, USA; Southern Methodist University , Department of Physics Dallas, TX 75205, USA; CSIRO Space and Astronomy , ATNF, P.O. Box 1130, Bentley WA 6102, AustraliaGeorge P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University , College Station, TX 77843-4242, USA; Southern Methodist University , Department of Physics Dallas, TX 75205, USAThe ultraluminous X-ray source CXO J133815.6+043255 is a strong candidate for a bona fide intermediate-mass black hole residing in the outskirts of NGC 5252. We present 22 GHz radio observations of this source obtained serendipitously in an ongoing high-frequency imaging survey of radio-quiet Active Galactic Nuclei (AGNs), and use this new data point to construct the broadband radio spectral energy distribution (SED). We find that the SED exhibits a spectral slope of α = −0.66 ± 0.02, consistent with a steep spectrum from optically thin synchrotron emission from an unresolved jet. We also find that the L _R / L _X ratio is approximately 10 ^−3 , inconsistent with radio-quiet AGN and many ULXs but consistent with low-luminosity AGN and radio-loud quasars. Together, these observations support the conclusion that CXO J133815.6+043255 is an intermediate-mass black hole producing a low-mass analog of radio jets seen in classical quasars.https://doi.org/10.3847/1538-4357/acf4f8Black holesIntermediate-mass black holesActive galactic nuclei |
| spellingShingle | Krista Lynne Smith Macon Magno Ashutosh Tripathi The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission The Astrophysical Journal Black holes Intermediate-mass black holes Active galactic nuclei |
| title | The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission |
| title_full | The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission |
| title_fullStr | The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission |
| title_full_unstemmed | The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission |
| title_short | The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission |
| title_sort | nature of the imbh candidate cxo j133815 6 043255 high frequency radio emission |
| topic | Black holes Intermediate-mass black holes Active galactic nuclei |
| url | https://doi.org/10.3847/1538-4357/acf4f8 |
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