@article{champagne_comprehensive_2021,
	title = {Comprehensive {Gas} {Characterization} of a \$z= 2.5\$ {Protocluster}: {A} {Cluster} {Core} {Caught} in the {Beginning} of {Virialization}?},
	volume = {2104},
	shorttitle = {Comprehensive {Gas} {Characterization} of a \$z= 2.5\$ {Protocluster}},
	url = {http://adsabs.harvard.edu/abs/2021arXiv210402098C},
	abstract = {In order to connect galaxy clusters to their progenitor protoclusters, 
we must constrain the star formation histories within their member
galaxies and the timescale of virial collapse. In this paper we
characterize the complex star-forming properties of a \$z=2.5\$
protocluster in the COSMOS field using ALMA dust continuum and new VLA
CO(1-0) observations of two filaments associated with the structure,
sometimes referred to as the "Hyperion" protocluster. We focus in
particular on the protocluster "core" which has previously been
suggested as the highest redshift bona fide galaxy cluster traced by
extended X-ray emission in a stacked Chandra/XMM image. We re-analyze
this data and refute these claims, finding that at least 40 \${\textbackslash}pm\$ 17\% of
extended X-ray sources of similar luminosity and size at this redshift
arise instead from Inverse Compton scattering off recently extinguished
radio galaxies rather than intracluster medium. Using ancillary COSMOS
data, we also constrain the SEDs of the two filaments' eight constituent
galaxies from the rest-frame UV to radio. We do not find evidence for
enhanced star formation efficiency in the core and conclude that the
constituent galaxies are already massive (M\$\_\{{\textbackslash}star\} {\textbackslash}approx 10{\textasciicircum}\{11\}
M\_\{{\textbackslash}odot\}\$), with molecular gas reservoirs \${\textgreater}10{\textasciicircum}\{10\} M\_\{{\textbackslash}odot\}\$ that
will be depleted within 200-400 Myr. Finally, we calculate the halo mass
of the nested core at \$z=2.5\$ and conclude that it will collapse into a
cluster of 2-9 \${\textbackslash}times 10{\textasciicircum}\{14\} M\_\{{\textbackslash}odot\}\$, comparable to the size of the
Coma cluster at \$z=0\$ and accounting for at least 50\% of the total
estimated halo mass of the extended "Hyperion" structure.},
	urldate = {2021-04-08},
	journal = {arXiv e-prints},
	author = {Champagne, Jaclyn B. and Casey, Caitlin M. and Zavala, Jorge A. and Cooray, Asantha and Dannerbauer, Helmut and Fabian, Andrew and Hayward, Christopher C. and Long, Arianna S. and Spilker, Justin S.},
	month = apr,
	year = {2021},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {arXiv:2104.02098},
}

{"_id":"xykKfC9uoA68a3zA6","bibbaseid":"champagne-casey-zavala-cooray-dannerbauer-fabian-hayward-long-etal-comprehensivegascharacterizationofaz25protoclusteraclustercorecaughtinthebeginningofvirialization-2021","author_short":["Champagne, J. B.","Casey, C. M.","Zavala, J. A.","Cooray, A.","Dannerbauer, H.","Fabian, A.","Hayward, C. C.","Long, A. S.","Spilker, J. S."],"bibdata":{"bibtype":"article","type":"article","title":"Comprehensive Gas Characterization of a \\$z= 2.5\\$ Protocluster: A Cluster Core Caught in the Beginning of Virialization?","volume":"2104","shorttitle":"Comprehensive Gas Characterization of a \\$z= 2.5\\$ Protocluster","url":"http://adsabs.harvard.edu/abs/2021arXiv210402098C","abstract":"In order to connect galaxy clusters to their progenitor protoclusters, we must constrain the star formation histories within their member galaxies and the timescale of virial collapse. In this paper we characterize the complex star-forming properties of a \\$z=2.5\\$ protocluster in the COSMOS field using ALMA dust continuum and new VLA CO(1-0) observations of two filaments associated with the structure, sometimes referred to as the \"Hyperion\" protocluster. We focus in particular on the protocluster \"core\" which has previously been suggested as the highest redshift bona fide galaxy cluster traced by extended X-ray emission in a stacked Chandra/XMM image. We re-analyze this data and refute these claims, finding that at least 40 \\${\\textbackslash}pm\\$ 17% of extended X-ray sources of similar luminosity and size at this redshift arise instead from Inverse Compton scattering off recently extinguished radio galaxies rather than intracluster medium. Using ancillary COSMOS data, we also constrain the SEDs of the two filaments' eight constituent galaxies from the rest-frame UV to radio. We do not find evidence for enhanced star formation efficiency in the core and conclude that the constituent galaxies are already massive (M\\$_\\{{\\textbackslash}star\\} {\\textbackslash}approx 10{\\textasciicircum}\\{11\\} M_\\{{\\textbackslash}odot\\}\\$), with molecular gas reservoirs \\${\\textgreater}10{\\textasciicircum}\\{10\\} M_\\{{\\textbackslash}odot\\}\\$ that will be depleted within 200-400 Myr. Finally, we calculate the halo mass of the nested core at \\$z=2.5\\$ and conclude that it will collapse into a cluster of 2-9 \\${\\textbackslash}times 10{\\textasciicircum}\\{14\\} M_\\{{\\textbackslash}odot\\}\\$, comparable to the size of the Coma cluster at \\$z=0\\$ and accounting for at least 50% of the total estimated halo mass of the extended \"Hyperion\" structure.","urldate":"2021-04-08","journal":"arXiv e-prints","author":[{"propositions":[],"lastnames":["Champagne"],"firstnames":["Jaclyn","B."],"suffixes":[]},{"propositions":[],"lastnames":["Casey"],"firstnames":["Caitlin","M."],"suffixes":[]},{"propositions":[],"lastnames":["Zavala"],"firstnames":["Jorge","A."],"suffixes":[]},{"propositions":[],"lastnames":["Cooray"],"firstnames":["Asantha"],"suffixes":[]},{"propositions":[],"lastnames":["Dannerbauer"],"firstnames":["Helmut"],"suffixes":[]},{"propositions":[],"lastnames":["Fabian"],"firstnames":["Andrew"],"suffixes":[]},{"propositions":[],"lastnames":["Hayward"],"firstnames":["Christopher","C."],"suffixes":[]},{"propositions":[],"lastnames":["Long"],"firstnames":["Arianna","S."],"suffixes":[]},{"propositions":[],"lastnames":["Spilker"],"firstnames":["Justin","S."],"suffixes":[]}],"month":"April","year":"2021","keywords":"Astrophysics - Astrophysics of Galaxies","pages":"arXiv:2104.02098","bibtex":"@article{champagne_comprehensive_2021,\n\ttitle = {Comprehensive {Gas} {Characterization} of a \\$z= 2.5\\$ {Protocluster}: {A} {Cluster} {Core} {Caught} in the {Beginning} of {Virialization}?},\n\tvolume = {2104},\n\tshorttitle = {Comprehensive {Gas} {Characterization} of a \\$z= 2.5\\$ {Protocluster}},\n\turl = {http://adsabs.harvard.edu/abs/2021arXiv210402098C},\n\tabstract = {In order to connect galaxy clusters to their progenitor protoclusters, \nwe must constrain the star formation histories within their member\ngalaxies and the timescale of virial collapse. In this paper we\ncharacterize the complex star-forming properties of a \\$z=2.5\\$\nprotocluster in the COSMOS field using ALMA dust continuum and new VLA\nCO(1-0) observations of two filaments associated with the structure,\nsometimes referred to as the \"Hyperion\" protocluster. We focus in\nparticular on the protocluster \"core\" which has previously been\nsuggested as the highest redshift bona fide galaxy cluster traced by\nextended X-ray emission in a stacked Chandra/XMM image. We re-analyze\nthis data and refute these claims, finding that at least 40 \\${\\textbackslash}pm\\$ 17\\% of\nextended X-ray sources of similar luminosity and size at this redshift\narise instead from Inverse Compton scattering off recently extinguished\nradio galaxies rather than intracluster medium. Using ancillary COSMOS\ndata, we also constrain the SEDs of the two filaments' eight constituent\ngalaxies from the rest-frame UV to radio. We do not find evidence for\nenhanced star formation efficiency in the core and conclude that the\nconstituent galaxies are already massive (M\\$\\_\\{{\\textbackslash}star\\} {\\textbackslash}approx 10{\\textasciicircum}\\{11\\}\nM\\_\\{{\\textbackslash}odot\\}\\$), with molecular gas reservoirs \\${\\textgreater}10{\\textasciicircum}\\{10\\} M\\_\\{{\\textbackslash}odot\\}\\$ that\nwill be depleted within 200-400 Myr. Finally, we calculate the halo mass\nof the nested core at \\$z=2.5\\$ and conclude that it will collapse into a\ncluster of 2-9 \\${\\textbackslash}times 10{\\textasciicircum}\\{14\\} M\\_\\{{\\textbackslash}odot\\}\\$, comparable to the size of the\nComa cluster at \\$z=0\\$ and accounting for at least 50\\% of the total\nestimated halo mass of the extended \"Hyperion\" structure.},\n\turldate = {2021-04-08},\n\tjournal = {arXiv e-prints},\n\tauthor = {Champagne, Jaclyn B. and Casey, Caitlin M. and Zavala, Jorge A. and Cooray, Asantha and Dannerbauer, Helmut and Fabian, Andrew and Hayward, Christopher C. and Long, Arianna S. and Spilker, Justin S.},\n\tmonth = apr,\n\tyear = {2021},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies},\n\tpages = {arXiv:2104.02098},\n}\n\n","author_short":["Champagne, J. B.","Casey, C. M.","Zavala, J. A.","Cooray, A.","Dannerbauer, H.","Fabian, A.","Hayward, C. C.","Long, A. S.","Spilker, J. S."],"key":"champagne_comprehensive_2021","id":"champagne_comprehensive_2021","bibbaseid":"champagne-casey-zavala-cooray-dannerbauer-fabian-hayward-long-etal-comprehensivegascharacterizationofaz25protoclusteraclustercorecaughtinthebeginningofvirialization-2021","role":"author","urls":{"Paper":"http://adsabs.harvard.edu/abs/2021arXiv210402098C"},"keyword":["Astrophysics - Astrophysics of Galaxies"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - astrophysics of galaxies"],"search_terms":["comprehensive","gas","characterization","protocluster","cluster","core","caught","beginning","virialization","champagne","casey","zavala","cooray","dannerbauer","fabian","hayward","long","spilker"],"title":"Comprehensive Gas Characterization of a \\$z= 2.5\\$ Protocluster: A Cluster Core Caught in the Beginning of Virialization?","year":2021}