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Titolo:
The enigma in the heart of Ursa Minor
Autore:
Demers, S; Battinelli, P;
Indirizzi:
Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 ys, Montreal, PQ H3C 3J7, Canada Osserv Astron Roma, I-00136 Rome, Italy Osserv Astron Roma Rome Italy I-00136 v Astron Roma, I-00136 Rome, Italy
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 377, anno: 2001,
pagine: 425 - 427
SICI:
1432-0746(200110)377:2<425:TEITHO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
DWARF SPHEROIDAL GALAXY; SUBMILLIMETER; DUST; VIEW;
Keywords:
galaxies : individual : Ursa Minor; galaxies : ISM; ISM : dust, extinction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Demers, S Univ Montreal, Dept Phys, CP 6128,Succursale Ctr Ville, Montreal, PQ H3C 3J7, Canada Univ Montreal CP 6128,Succursale Ctr Ville Montreal PQCanada H3C 3J7
Citazione:
S. Demers e P. Battinelli, "The enigma in the heart of Ursa Minor", ASTRON ASTR, 377(2), 2001, pp. 425-427

Abstract

To investigate the physical nature of the observed deficiency of stars in the very center of the Ursa Minor Dwarf Spheroidal galaxy, we recently obtained JCMT-SCUBA 850 mum photometry of this region. The observed void could be explained by approximate to 0.5 mag of extinction. While the amount of dust needed to produce such absorption (under certain assumptions for the dust temperature and the beta exponent in the dust emissivity term) would yield a 5 mJy signal - easily detectable by SCUBA - we found no signal at 850 mum, after 256 min of integration. This finding rules out the presence of afew solar masses of cold dust cloud as the explanation for the central lack of stars observed in Ursa Minor. We discuss possible explanations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 17:59:13