An Overabundance of Radio-AGN in the SPT2349-56 Protocluster: Preheating the Intra-Cluster Medium
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917098294345728 |
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| author | Chapman, Scott C. Deane, Roger P. Zhou, Dazhi Aravena, Manuel Rasakanya, William Archipley, Melanie Burgoyne, James Cathey, Jared Gonzalez, Anthony H. Hill, Ryley Hughes, Chayce Llave, Monica Natalia Isla Malkan, Matt Phadke, Kedar A. Pillai, Vismaya Posses, Ana Slocombe, Bonnie Solimano, Manuel Spilker, Justin Sulzenauer, Nikolaus Vito, Fabio Vieira, Joaquin D. Vizgan, David Wang, George Weiss, Axel |
| author_facet | Chapman, Scott C. Deane, Roger P. Zhou, Dazhi Aravena, Manuel Rasakanya, William Archipley, Melanie Burgoyne, James Cathey, Jared Gonzalez, Anthony H. Hill, Ryley Hughes, Chayce Llave, Monica Natalia Isla Malkan, Matt Phadke, Kedar A. Pillai, Vismaya Posses, Ana Slocombe, Bonnie Solimano, Manuel Spilker, Justin Sulzenauer, Nikolaus Vito, Fabio Vieira, Joaquin D. Vizgan, David Wang, George Weiss, Axel |
| contents | Following the detection of a radio-loud Active Galactic Nucleus (AGN) in the z=4.3 protocluster SPT2349-56, we have obtained additional observations with MeerKAT in S-band (2.4 GHz) with the aim of further characterizing radio emission from amongst the ~30 submillimeter (submm) galaxies (SMGs) identified in the structure. We newly identify three of the protocluster SMGs individually at 2.4GHz as having a radio-excess, two of which are now known to be X-ray luminous AGN. Two additional members are also detected with radio emission consistent with their star formation rate (SFR). Archival MeerKAT UHF (816 MHz) observations further constrain luminosities and radio spectral indices of these five galaxies. The Australia Telescope Compact Array (ATCA) is used to detect and resolve the central two sources at 5.5 and 9.0 GHz finding elongated, jet-like morphologies. The excess radio luminosities range from L1.4,rest = (1-20)x10^25 W/Hz, ~10-100x higher than expected from the SFRs, assuming the usual far-infrared-radio correlation. Of the known cluster members, only the SMG `N1' shows signs of AGN in any other diagnostics, namely a large and compact excess in CO(11-10) line emission. We compare these results to field samples of radio sources and SMGs. The overdensity of radio-loud AGN in the compact core region of the cluster may be providing significant heating to the recently discovered nascent intra-cluster medium (ICM) in SPT2349-56. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_17814 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An Overabundance of Radio-AGN in the SPT2349-56 Protocluster: Preheating the Intra-Cluster Medium Chapman, Scott C. Deane, Roger P. Zhou, Dazhi Aravena, Manuel Rasakanya, William Archipley, Melanie Burgoyne, James Cathey, Jared Gonzalez, Anthony H. Hill, Ryley Hughes, Chayce Llave, Monica Natalia Isla Malkan, Matt Phadke, Kedar A. Pillai, Vismaya Posses, Ana Slocombe, Bonnie Solimano, Manuel Spilker, Justin Sulzenauer, Nikolaus Vito, Fabio Vieira, Joaquin D. Vizgan, David Wang, George Weiss, Axel Astrophysics of Galaxies Following the detection of a radio-loud Active Galactic Nucleus (AGN) in the z=4.3 protocluster SPT2349-56, we have obtained additional observations with MeerKAT in S-band (2.4 GHz) with the aim of further characterizing radio emission from amongst the ~30 submillimeter (submm) galaxies (SMGs) identified in the structure. We newly identify three of the protocluster SMGs individually at 2.4GHz as having a radio-excess, two of which are now known to be X-ray luminous AGN. Two additional members are also detected with radio emission consistent with their star formation rate (SFR). Archival MeerKAT UHF (816 MHz) observations further constrain luminosities and radio spectral indices of these five galaxies. The Australia Telescope Compact Array (ATCA) is used to detect and resolve the central two sources at 5.5 and 9.0 GHz finding elongated, jet-like morphologies. The excess radio luminosities range from L1.4,rest = (1-20)x10^25 W/Hz, ~10-100x higher than expected from the SFRs, assuming the usual far-infrared-radio correlation. Of the known cluster members, only the SMG `N1' shows signs of AGN in any other diagnostics, namely a large and compact excess in CO(11-10) line emission. We compare these results to field samples of radio sources and SMGs. The overdensity of radio-loud AGN in the compact core region of the cluster may be providing significant heating to the recently discovered nascent intra-cluster medium (ICM) in SPT2349-56. |
| title | An Overabundance of Radio-AGN in the SPT2349-56 Protocluster: Preheating the Intra-Cluster Medium |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2511.17814 |