Clusters of Galaxies Masquerading as X-Ray Quasars
Inspired by the discovery of the Phoenix cluster by the South Pole Telescope team, we initiated a search for other massive clusters of galaxies missing from the standard X-ray catalogs. We began by identifying 25 cluster candidates not included in the Meta-Catalog of X-ray Clusters of galaxies clust...
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ftdatacite:10.48550/arxiv.2002.09431 2023-05-15T18:23:07+02:00 Clusters of Galaxies Masquerading as X-Ray Quasars Donahue, Megan Funkhouser, Kelsey Koeppe, Dana Frisbie, Rachel L. S. Voit, G. Mark 2020 https://dx.doi.org/10.48550/arxiv.2002.09431 https://arxiv.org/abs/2002.09431 unknown arXiv https://dx.doi.org/10.3847/1538-4357/ab64da arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Astrophysics of Galaxies astro-ph.GA FOS Physical sciences article-journal Article ScholarlyArticle Text 2020 ftdatacite https://doi.org/10.48550/arxiv.2002.09431 https://doi.org/10.3847/1538-4357/ab64da 2022-03-10T16:00:51Z Inspired by the discovery of the Phoenix cluster by the South Pole Telescope team, we initiated a search for other massive clusters of galaxies missing from the standard X-ray catalogs. We began by identifying 25 cluster candidates not included in the Meta-Catalog of X-ray Clusters of galaxies cluster compilation through cross-identification of the central galaxies of optically identified clusters in the Sloan Digital Sky Survey GMBCG catalog with bright X-ray sources in the ROSAT Bright Source Catalog. Those candidates were mostly unidentified or previously classified as X-ray active galactic nucleus (AGN). We analyzed brief Chandra X-ray Observatory observations of 14 of these X-ray sources and found that eight are X-ray luminous clusters of galaxies, only one showing evidence for a central X-ray point source. The remaining six candidates turned out to be point-source dominated, with faint detections or upper limits on any extended emission. We were not able to rule out the presence of extended X-ray emission from any of the point sources. The levels of extended emission around the six point sources are consistent with expectations based on optical richness, but could also be contaminated by scattered X-ray light from the central point source or extended nonthermal emission from possible radio lobes. We characterize the extended components of each of the well-detected cluster sources, finding that six of the eight X-ray clusters are consistent with being compact cool-core clusters. One of the newly identified low-luminosity X-ray clusters may have had an X-ray-luminous AGN 20 yr prior to the recent Chandra observations, based on the 4σ difference between its Chandra and ROSAT fluxes. : PDF, as published in Astrophysical Journal. 4 figures, 4 tables Article in Journal/Newspaper South pole DataCite Metadata Store (German National Library of Science and Technology) Ray Point ENVELOPE(-101.100,-101.100,59.575,59.575) South Pole |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
spellingShingle |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences Donahue, Megan Funkhouser, Kelsey Koeppe, Dana Frisbie, Rachel L. S. Voit, G. Mark Clusters of Galaxies Masquerading as X-Ray Quasars |
topic_facet |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
description |
Inspired by the discovery of the Phoenix cluster by the South Pole Telescope team, we initiated a search for other massive clusters of galaxies missing from the standard X-ray catalogs. We began by identifying 25 cluster candidates not included in the Meta-Catalog of X-ray Clusters of galaxies cluster compilation through cross-identification of the central galaxies of optically identified clusters in the Sloan Digital Sky Survey GMBCG catalog with bright X-ray sources in the ROSAT Bright Source Catalog. Those candidates were mostly unidentified or previously classified as X-ray active galactic nucleus (AGN). We analyzed brief Chandra X-ray Observatory observations of 14 of these X-ray sources and found that eight are X-ray luminous clusters of galaxies, only one showing evidence for a central X-ray point source. The remaining six candidates turned out to be point-source dominated, with faint detections or upper limits on any extended emission. We were not able to rule out the presence of extended X-ray emission from any of the point sources. The levels of extended emission around the six point sources are consistent with expectations based on optical richness, but could also be contaminated by scattered X-ray light from the central point source or extended nonthermal emission from possible radio lobes. We characterize the extended components of each of the well-detected cluster sources, finding that six of the eight X-ray clusters are consistent with being compact cool-core clusters. One of the newly identified low-luminosity X-ray clusters may have had an X-ray-luminous AGN 20 yr prior to the recent Chandra observations, based on the 4σ difference between its Chandra and ROSAT fluxes. : PDF, as published in Astrophysical Journal. 4 figures, 4 tables |
format |
Article in Journal/Newspaper |
author |
Donahue, Megan Funkhouser, Kelsey Koeppe, Dana Frisbie, Rachel L. S. Voit, G. Mark |
author_facet |
Donahue, Megan Funkhouser, Kelsey Koeppe, Dana Frisbie, Rachel L. S. Voit, G. Mark |
author_sort |
Donahue, Megan |
title |
Clusters of Galaxies Masquerading as X-Ray Quasars |
title_short |
Clusters of Galaxies Masquerading as X-Ray Quasars |
title_full |
Clusters of Galaxies Masquerading as X-Ray Quasars |
title_fullStr |
Clusters of Galaxies Masquerading as X-Ray Quasars |
title_full_unstemmed |
Clusters of Galaxies Masquerading as X-Ray Quasars |
title_sort |
clusters of galaxies masquerading as x-ray quasars |
publisher |
arXiv |
publishDate |
2020 |
url |
https://dx.doi.org/10.48550/arxiv.2002.09431 https://arxiv.org/abs/2002.09431 |
long_lat |
ENVELOPE(-101.100,-101.100,59.575,59.575) |
geographic |
Ray Point South Pole |
geographic_facet |
Ray Point South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.3847/1538-4357/ab64da |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.2002.09431 https://doi.org/10.3847/1538-4357/ab64da |
_version_ |
1766202552735498240 |