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For refcode 1996MNRAS.280..537L:
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Copyright by Royal Astronomical Society. 1996MNRAS.280..537L Optical observations of Dwingeloo 1, a nearby barred spiral galaxy behind the Milky Way A. J. Loan, S. J. Maddox, O. Lahav, M. Balcells, R. C. Kraan-Korteweg, R. Assendorp, E. Almoznino, N. Brosch, E. Goldberg and E. O. Ofek Institute of Astronomy, Madingley Road, Cambridge CB3 0HA Royal Greenwich Observatory, Madingley Road Cambridge CB3 0EZ Kapteyn Astronomical Institute, Postbus 800, 97OOAv Groningen, The Netherlands Observatoire de Paris-Meudon, DAEC, 5 Place Jules Janssen, F- 921 95 Meudon-Cedex France Astrophysical Institute of Potsdam, An der Sterwarte 16, D-14482 Potsdam- Babelsburg, Germany Wise Observatory Tel Aviv University Ramat Aviv Tel Aviv 69978, Israel Accepted 1995 December 11. Received 1995 December 4; in original form 1995 August 29 ABSTRACT We present new Optical observations of the nearby barred spiral galaxy Dwingeloo 1 (Dw1) obtained with the Isaac Newton, William Herschel and Wise telescopes. Dw1 lies at Galactic coordinates (l= 138.52^deg^, b = - 0.11^deg^) and it is heavily obscured by dust and gas in the Milky Way. We infer that Dw1 is of morphological type SBb or SBc (T=4), has an inclination i ~ 50^deg^, a position angle PA ` 110^deg^, and a recession velocity relative to the Milky Way V_MW_ = 256 +/- 9 km s^-1^. The measured total apparent magnitudes of Dw1 are V = 14.0 +/- 0.5, R = 12.2 +/- 0.2 and I = 10.7 +/- 0.2. The extinction estimate towards Dw1 is highly uncertain. The extinction in the B band, derived from Galactic H I column density measurements, is A_B_ ~ 5.8. Estimated from Galactic 100 micron emission, the extinction is A_B_ ~ 4.3, while the reddened colours of Dw1 yield an estimate of A_B_ ~ 10.4. Assuming A_B_ = 5.8, Tully- Fisher relations in the I and R bands lead to a distance estimate for Dw1 of D ~ 300 km s^-1^, However, for the derived range of extinction estimates 4.3 <~ A_B_ <~ 10.4, the distance varies from 100 to 500 km s^- 1^. We also report the detection of numerous HII regions associated with Dw1, and present data from the Infrared Astronomical Satellite (IRAS) archive. Key words: galaxies: individual: Dwingeloo 1 - local Group - galaxies: spiral - galaxies: photometry.
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