Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Discovery of ghost cavities in the X-ray atmosphere of Abell 2597
Autore:
McNamara, BR; Wise, MW; Nulsen, PEJ; David, LP; Carilli, CL; Sarazin, CL; ODea, CP; Houck, J; Donahue, M; Baum, S; Voit, M; OConnell, RW; Koekemoer, A;
Indirizzi:
Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA Ohio Univ Athens OH USA 45701 v, Dept Phys & Astron, Athens, OH 45701 USA Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA Harvard Smithsonian Ctr Astrophys Cambridge MA USA 02138 ge, MA 02138 USA MIT, Ctr Space Res, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139MIT, Ctr Space Res, Cambridge, MA 02139 USA Univ Wollongong, Wollongong, NSW 2522, Australia Univ Wollongong Wollongong NSW Australia 2522 ongong, NSW 2522, Australia Natl Radio Astron Observ, Socorro, NM 87801 USA Natl Radio Astron Observ Socorro NM USA 87801 serv, Socorro, NM 87801 USA Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA Univ Virginia Charlottesville VA USA 22903 Charlottesville, VA 22903 USA Space Telescope Sci Inst, Baltimore, MD 21218 USA Space Telescope Sci Inst Baltimore MD USA 21218 , Baltimore, MD 21218 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 562, anno: 2001,
parte:, 2
pagine: L149 - L152
SICI:
0004-637X(200112)562:2<L149:DOGCIT>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
EMITTING GAS; RADIO LOBES; CLUSTER GAS; CYGNUS-A; GALAXIES;
Keywords:
cooling flows; galaxies : clusters : general; intergalactic medium; radio continuum : galaxies; X-rays : galaxies : clusters;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: McNamara, BR Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA Ohio Univ Athens OH USA 45701 & Astron, Athens, OH 45701 USA
Citazione:
B.R. McNamara et al., "Discovery of ghost cavities in the X-ray atmosphere of Abell 2597", ASTROPHYS J, 562(2), 2001, pp. L149-L152

Abstract

A Chandra image of the central 100 kpc of the Abell 2597 cluster of galaxies shows bright irregular X-ray emission within the central dominant cluster galaxy (CDG) and two low surface brightness cavities located 30 kpc from the nucleus of the CDG. Unlike the cavities commonly seen in other clusters, the "ghost" cavities in Abell 2597 are not coincident with the bright central radio source. Instead, they appear to be associated with faint extended radio emission seen in a deep Very Large Array radio map. We interpret the ghost cavities as buoyantly rising relics of a radio outburst that occurred between 50 and 100 Myr ago. The demography of cavities in the few clusters studied thus far shows that galactic radio sources experience recurrent outbursts on an similar to 100 Myr timescale. Over the lifetime of a cluster, ghost cavities emerging from CDGs deposit greater than or similar to 10(59)-10(61) ergs of energy into the intracluster medium. If a significant fraction of this energy is deposited as magnetic field, it would account for the high field strengths in the cooling flow regions of clusters. The similarity between the central cooling time of the keV gas and the radio cyclingtimescale suggests that feedback between cooling gas and the radio source may be retarding or quenching the cooling flow.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 02:07:45