Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Hot halo gas in the Virgo cluster galaxy NGC 4569
Autore:
Tschoke, D; Bomans, DJ; Hensler, G; Junkes, N;
Indirizzi:
Univ Kiel, Inst Theoret Phys & Astrophys, D-24098 Kiel, Germany Univ KielKiel Germany D-24098 t Phys & Astrophys, D-24098 Kiel, Germany Ruhr Univ Bochum, Astron Inst, D-44780 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44780 on Inst, D-44780 Bochum, Germany Max Planck Inst Radioastron, D-53121 Bonn, Germany Max Planck Inst Radioastron Bonn Germany D-53121 , D-53121 Bonn, Germany
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 1, volume: 380, anno: 2001,
pagine: 40 - 54
SICI:
1432-0746(200112)380:1<40:HHGITV>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-EMISSION; H-ALPHA EMISSION; SPIRAL GALAXIES; NEUTRAL HYDROGEN; STAR-FORMATION; STARBURST; NUCLEI; DISK; NGC-4569; M82;
Keywords:
galaxies : active; galaxies : starburst; galaxies : ISM; galaxies : individual : NGC 4569, IC 3583; X-rays : galaxies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Hensler, G Univ Kiel, Inst Theoret Phys & Astrophys, Olshaussenstr 40, D-24098 Kiel, Germany Univ Kiel Olshaussenstr 40 Kiel Germany D-24098 Kiel, Germany
Citazione:
D. Tschoke et al., "Hot halo gas in the Virgo cluster galaxy NGC 4569", ASTRON ASTR, 380(1), 2001, pp. 40-54

Abstract

We have observed the Virgo cluster spiral NGC 4569 in X-rays with ROSAT (0.1-2.4 keV) and in the optical. From the PSPC image one can distinguish different components, like the dominant source in the nuclear region, the galactic disk, and a diffuse soft component extended to the west. This latter one coincides with a giant H alpha structure. In both spectral ranges the structure reaches up to 9 kpc out of the disk. This coincidence, the soft X-ray energy distribution, and the existence of a central starburst in NGC 4569 let us conclude that the X-ray gas traces a large scale out ow from accumulating supernova explosions and stellar winds in the galactic center. The resulting physical properties of this X-ray halo are comparable to those derived from X-ray halos in edge-on galaxies, like e.g. NGC 253. We also discuss the influence of the intracluster medium on the observed X-ray and H alpha morphology. The spectral 0.1-2.4 keV distribution of the central sourceand the X-ray-to-H alpha luminosity ratio favour a supermassive star cluster at the very compact core rather than an accretion-powered active nucleusin agreement with the absence of a hard compact X-ray source in the ASCA band. The nearby Magellanic dwarf galaxy IC 3583 at a projected distance of only 30 kpc reveals an unresolved X-ray point source, several blue knots inthe optical, and a narrow H alpha spur, pointing toward NGC 4569, detectedalso in the B band image. This is an indication for ongoing star formationalso in IC 3583. Some interaction with NGC 4569 will be discussed althoughthe relative radial velocity between both objects of about 1300 km s(-1) makes it rather unlikely.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 08:37:23