Optical observations of Dwingeloo 1, a nearby barred spiral galaxy behind the Milky Way

Details Optical observations of Dwingeloo 1, a nearby barred spiral galaxy behind the Milky Way Optical observations of Dwingeloo 1, a nearby barred spiral galaxy behind the Milky Way

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280..537l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 2, pp. 537-549.

Astronomy and Astrophysics

Astronomy

9

Galaxies: Individual: Dwingeloo 1, Local Group, Galaxies: Spiral, Galaxies: Photometry

Scientific paper

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, b=-0.˚11) 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 HI column density measurements, is A_B~=5.8. Estimated from Galactic 100-μm 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.

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