The enigma in the heart of Ursa Minor

Details The enigma in the heart of Ursa Minor The enigma in the heart of Ursa Minor

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...377..425d&link_type=abstract

Astronomy and Astrophysics, v.377, p.425-427 (2001)

Astronomy and Astrophysics

Astrophysics

1

Galaxies: Individual: Ursa Minor, Galaxies: Ism, Ism: Dust, Extinction

Scientific paper

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 mu m photometry of this region. The observed void could be explained by ~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 mu m, after 256 min of integration. This finding rules out the presence of a few solar masses of cold dust cloud as the explanation for the central lack of stars observed in Ursa Minor. We discuss possible explanations.

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