Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948
We present VLA Low-band Ionosphere and Transient Experiment (VLITE) 338 MHz observations of the galaxy cluster CL 0838+1948. We combine the VLITE data with Giant Metrewave Radio Telescope 610 MHz observations and survey data. The central galaxy hosts a 250 kpc source whose emission is dominated by t...
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MDPI AG
2021-11-01
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| Series: | Galaxies |
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| Online Access: | https://www.mdpi.com/2075-4434/9/4/108 |
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| author | Simona Giacintucci Tracy Clarke Namir E. Kassim Wendy Peters Emil Polisensky |
| author_facet | Simona Giacintucci Tracy Clarke Namir E. Kassim Wendy Peters Emil Polisensky |
| author_sort | Simona Giacintucci |
| collection | DOAJ |
| description | We present VLA Low-band Ionosphere and Transient Experiment (VLITE) 338 MHz observations of the galaxy cluster CL 0838+1948. We combine the VLITE data with Giant Metrewave Radio Telescope 610 MHz observations and survey data. The central galaxy hosts a 250 kpc source whose emission is dominated by two large lobes at low frequencies. At higher frequencies, a pair of smaller lobes (∼30 kpc) is detected within the galaxy optical envelope. The observed morphology is consistent with a restarted radio galaxy. The outer lobes have a spectral index <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>α</mi><mi>out</mi></msub><mo>=</mo><mn>1.6</mn></mrow></semantics></math></inline-formula>, indicating that they are old, whereas the inner lobes have <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>α</mi><mi>inn</mi></msub><mo>=</mo><mn>0.6</mn></mrow></semantics></math></inline-formula>, typical for an active source. Spectral modeling confirms that the outer emission is a dying source whose nuclear activity switched off not more than 110 Myr ago. Using archival <i>Chandra</i> X-ray data, we compare the radio and hot gas emission. We find that the active radio source is contained within the innermost and X-ray brightest region, possibly a galactic corona. Alternatively, it could be the remnant of a larger cool core whose outer layers have been heated by the former epoch of activity that has generated the outer lobes. |
| first_indexed | 2024-03-10T04:04:33Z |
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| issn | 2075-4434 |
| language | English |
| last_indexed | 2024-03-10T04:04:33Z |
| publishDate | 2021-11-01 |
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| series | Galaxies |
| spelling | doaj.art-a7a8ebd49d264fbdb398335717b0118a2023-11-23T08:26:19ZengMDPI AGGalaxies2075-44342021-11-019410810.3390/galaxies9040108Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948Simona Giacintucci0Tracy Clarke1Namir E. Kassim2Wendy Peters3Emil Polisensky4Naval Research Laboratory, 4555 Overlook Avenue SW, Code 7213, Washington, DC 20375, USANaval Research Laboratory, 4555 Overlook Avenue SW, Code 7213, Washington, DC 20375, USANaval Research Laboratory, 4555 Overlook Avenue SW, Code 7213, Washington, DC 20375, USANaval Research Laboratory, 4555 Overlook Avenue SW, Code 7213, Washington, DC 20375, USANaval Research Laboratory, 4555 Overlook Avenue SW, Code 7213, Washington, DC 20375, USAWe present VLA Low-band Ionosphere and Transient Experiment (VLITE) 338 MHz observations of the galaxy cluster CL 0838+1948. We combine the VLITE data with Giant Metrewave Radio Telescope 610 MHz observations and survey data. The central galaxy hosts a 250 kpc source whose emission is dominated by two large lobes at low frequencies. At higher frequencies, a pair of smaller lobes (∼30 kpc) is detected within the galaxy optical envelope. The observed morphology is consistent with a restarted radio galaxy. The outer lobes have a spectral index <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>α</mi><mi>out</mi></msub><mo>=</mo><mn>1.6</mn></mrow></semantics></math></inline-formula>, indicating that they are old, whereas the inner lobes have <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>α</mi><mi>inn</mi></msub><mo>=</mo><mn>0.6</mn></mrow></semantics></math></inline-formula>, typical for an active source. Spectral modeling confirms that the outer emission is a dying source whose nuclear activity switched off not more than 110 Myr ago. Using archival <i>Chandra</i> X-ray data, we compare the radio and hot gas emission. We find that the active radio source is contained within the innermost and X-ray brightest region, possibly a galactic corona. Alternatively, it could be the remnant of a larger cool core whose outer layers have been heated by the former epoch of activity that has generated the outer lobes.https://www.mdpi.com/2075-4434/9/4/108radio galaxiesactive galactic nucleigalaxy clusters |
| spellingShingle | Simona Giacintucci Tracy Clarke Namir E. Kassim Wendy Peters Emil Polisensky Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948 Galaxies radio galaxies active galactic nuclei galaxy clusters |
| title | Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948 |
| title_full | Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948 |
| title_fullStr | Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948 |
| title_full_unstemmed | Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948 |
| title_short | Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948 |
| title_sort | radio and x ray observations of the restarted radio galaxy in the galaxy cluster cl 0838 1948 |
| topic | radio galaxies active galactic nuclei galaxy clusters |
| url | https://www.mdpi.com/2075-4434/9/4/108 |
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