On the merging cluster Abell 578 and its central radio galaxy 4C+67.13

2015
journal article
article
4
cris.lastimport.wos2024-04-10T02:55:19Z
dc.abstract.enHere we analyze radio, optical, and X-ray data for the peculiar cluster Abell 578. This cluster is not fully relaxed and consists of two merging sub-systems. The brightest cluster galaxy (BCG), CGPG 0719.8+6704, is a pair of interacting ellipticals with projected separation $\sim$10 kpc, the brighter of which hosts the radio source 4C+67.13. The Fanaroff–Riley type-II radio morphology of 4C+67.13 is unusual for central radio galaxies in local Abell clusters. Our new optical spectroscopy revealed that both nuclei of the CGPG 0719.8+6704 pair are active, albeit at low accretion rates corresponding to the Eddington ratio $\sim 10^{-4}$ (for the estimated black hole masses of $\sim 3 \times 10^{8} M_{\bigodot }$ and $\sim 10^{9} M_{\bigodot }$. The gathered X-ray (Chandra) data allowed us to confirm and to quantify robustly the previously noted elongation of the gaseous atmosphere in the dominant sub-cluster, as well as a large spatial offset ($\sim$ 60 kpc projected) between the position of the BCG and the cluster center inferred from the modeling of the X-ray surface brightness distribution. Detailed analysis of the brightness profiles and temperature revealed also that the cluster gas in the vicinity of 4C+67.13 is compressed (by a factor of about $\sim$ 1.4) and heated (from $\simeq$ 2.0 keV up to 2.7 keV), consistent with the presence of a weak shock (Mach number $\sim$ 1.3) driven by the expanding jet cocoon. This would then require the jet kinetic power of the order of $\sim 10 ^{45}erg s^{-1}$, implying either a very high efficiency of the jet production for the current accretion rate, or a highly modulated jet/accretion activity in the system.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorHagino, K.pl
dc.contributor.authorStawarz, Łukasz - 132081 pl
dc.contributor.authorSiemiginowska, A.pl
dc.contributor.authorCheung, C. C.pl
dc.contributor.authorKozieł-Wierzbowska, Dorota - 146955 pl
dc.contributor.authorSzostek, Anna - 160691 pl
dc.contributor.authorMadejski, G.pl
dc.contributor.authorHarris, D. E.pl
dc.contributor.authorSimionescu, A.pl
dc.contributor.authorTakahashi, T.pl
dc.date.accessioned2015-07-14T10:30:57Z
dc.date.available2015-07-14T10:30:57Z
dc.date.issued2015pl
dc.date.openaccess12
dc.description.accesstimepo opublikowaniu
dc.description.admin[AB] Szostek, Anna [SAP11019463] 50000139
dc.description.number2pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume805pl
dc.identifier.articleid101pl
dc.identifier.articleid101pl
dc.identifier.doi10.1088/0004-637X/805/2/101pl
dc.identifier.eissn1538-4357pl
dc.identifier.issn0004-637Xpl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/12768
dc.languageengpl
dc.language.containerengpl
dc.rights.licenceOTHER
dc.share.typeotwarte czasopismo
dc.subject.engalaxies: activepl
dc.subject.engalaxies: clusters: individual (Abell 578)pl
dc.subject.engalaxies: individual (4C+67.13)pl
dc.subject.engalaxies: jetspl
dc.subject.enintergalactic mediumpl
dc.subject.enX-rays: galaxies: clusterspl
dc.subtypeArticlepl
dc.titleOn the merging cluster Abell 578 and its central radio galaxy 4C+67.13pl
dc.title.journalThe Astrophysical Journalpl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.wos
2024-04-10T02:55:19Z
dc.abstract.enpl
Here we analyze radio, optical, and X-ray data for the peculiar cluster Abell 578. This cluster is not fully relaxed and consists of two merging sub-systems. The brightest cluster galaxy (BCG), CGPG 0719.8+6704, is a pair of interacting ellipticals with projected separation $\sim$10 kpc, the brighter of which hosts the radio source 4C+67.13. The Fanaroff–Riley type-II radio morphology of 4C+67.13 is unusual for central radio galaxies in local Abell clusters. Our new optical spectroscopy revealed that both nuclei of the CGPG 0719.8+6704 pair are active, albeit at low accretion rates corresponding to the Eddington ratio $\sim 10^{-4}$ (for the estimated black hole masses of $\sim 3 \times 10^{8} M_{\bigodot }$ and $\sim 10^{9} M_{\bigodot }$. The gathered X-ray (Chandra) data allowed us to confirm and to quantify robustly the previously noted elongation of the gaseous atmosphere in the dominant sub-cluster, as well as a large spatial offset ($\sim$ 60 kpc projected) between the position of the BCG and the cluster center inferred from the modeling of the X-ray surface brightness distribution. Detailed analysis of the brightness profiles and temperature revealed also that the cluster gas in the vicinity of 4C+67.13 is compressed (by a factor of about $\sim$ 1.4) and heated (from $\simeq$ 2.0 keV up to 2.7 keV), consistent with the presence of a weak shock (Mach number $\sim$ 1.3) driven by the expanding jet cocoon. This would then require the jet kinetic power of the order of $\sim 10 ^{45}erg s^{-1}$, implying either a very high efficiency of the jet production for the current accretion rate, or a highly modulated jet/accretion activity in the system.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Hagino, K.
dc.contributor.authorpl
Stawarz, Łukasz - 132081
dc.contributor.authorpl
Siemiginowska, A.
dc.contributor.authorpl
Cheung, C. C.
dc.contributor.authorpl
Kozieł-Wierzbowska, Dorota - 146955
dc.contributor.authorpl
Szostek, Anna - 160691
dc.contributor.authorpl
Madejski, G.
dc.contributor.authorpl
Harris, D. E.
dc.contributor.authorpl
Simionescu, A.
dc.contributor.authorpl
Takahashi, T.
dc.date.accessioned
2015-07-14T10:30:57Z
dc.date.available
2015-07-14T10:30:57Z
dc.date.issuedpl
2015
dc.date.openaccess
12
dc.description.accesstime
po opublikowaniu
dc.description.admin
[AB] Szostek, Anna [SAP11019463] 50000139
dc.description.numberpl
2
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
805
dc.identifier.articleidpl
101
dc.identifier.articleidpl
101
dc.identifier.doipl
10.1088/0004-637X/805/2/101
dc.identifier.eissnpl
1538-4357
dc.identifier.issnpl
0004-637X
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/12768
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights.licence
OTHER
dc.share.type
otwarte czasopismo
dc.subject.enpl
galaxies: active
dc.subject.enpl
galaxies: clusters: individual (Abell 578)
dc.subject.enpl
galaxies: individual (4C+67.13)
dc.subject.enpl
galaxies: jets
dc.subject.enpl
intergalactic medium
dc.subject.enpl
X-rays: galaxies: clusters
dc.subtypepl
Article
dc.titlepl
On the merging cluster Abell 578 and its central radio galaxy 4C+67.13
dc.title.journalpl
The Astrophysical Journal
dc.typepl
JournalArticle
dspace.entity.type
Publication

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