SIMBAD references

2001A&A...377..425D - Astronomy and Astrophysics, volume 377, 425-427 (2001/10-2)

The enigma in the heart of Ursa Minor.


Abstract (from CDS):

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 850µm photometry of this region. The observed void could be explained by ≃0.5mag of extinction. While the amount of dust needed to produce such absorption (under certain assumptions for the dust temperature and the β exponent in the dust emissivity term) would yield a 5mJy signal - easily detectable by SCUBA - we found no signal at 850µm, after 256min 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.

Abstract Copyright:

Journal keyword(s): galaxies: individual: Ursa Minor - galaxies: ISM - ISM: dust, extinction

Simbad objects: 7

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