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Astron. Astrophys. 327, 963-965


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Research Note

The surface brightness and distance of Dwingeloo 1

S. Phillipps1 and J.I. Davies2

1Astrophysics Group, Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
2Department of Physics and Astronomy, University of Wales College of Cardiff, PO Box 913, Cardiff CF2 3TH, UK

Received 28 April 1997 / Accepted 21 July 1997

Abstract

The Tully-Fisher distance to the galaxy Dwingeloo 1, recently discovered very close to the Galactic Plane, is highly uncertain because of the range of possible foreground extinction values which have been suggested. We show that very high values of AB ($\sim 10$ magnitudes) or low values ($\sim 4$ magnitudes) are unreasonable since the intrinsic surface brightness implied for Dwingeloo 1 would be unrealistically high or low for a mid type disc galaxy. Obtaining 'normal' surface brightness values requires AB close to 6 magnitudes. We therefore concur with distance estimates which suggest values $\sim 3$ Mpc.

Key words: galaxies: individual: Dwingeloo 1 - galaxies: distances and redshifts - galaxies: photometry - dust, extinction

Send offprint requests to: S. Phillipps


© European Southern Observatory (ESO) 1997

Online publication: October 20, 1997
Last change: April 6, 1998
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