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Astron. Astrophys. 327, 963-965 (1997)
Research Note
The surface brightness and distance of Dwingeloo 1
S. Phillipps 1 and
J.I. Davies 2
1 Astrophysics Group, Department of Physics, University of
Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
2 Department 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
![[FORMULA]](img1.gif)
(
![[FORMULA]](img2.gif)
magnitudes) or low values (
![[FORMULA]](img3.gif)
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
close to 6 magnitudes. We therefore concur with
distance estimates which suggest values
![[FORMULA]](img4.gif)
Mpc.
Key words: galaxies: individual: Dwingeloo
1 
galaxies: distances and
redshifts
galaxies:
photometry
dust, extinction
Send offprint requests to: S. Phillipps
Contents
- 1. Introduction
- 2. Surface brightness
- 3. Extinction
- 4. Discussion
- References
© European Southern Observatory (ESO) 1997
Online publication: April 6, 1998
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