The Galactic Extinction towards Maffei 1

Show simple item record Buta, Ronald M. McCall en_US 2019-08-02T19:01:26Z 2019-08-02T19:01:26Z 1983 1983-11-01
dc.identifier.citation Buta, R., McCall, M. (1983): The Galactic Extinction towards Maffei 1. Monthly Notices of the Royal Astronomical Society, 205(1). DOI: en_US
dc.description.abstract The extinction of Maffei 1 has been measured by two new techniques. First, BV aperture photometry has been performed to obtain the colour excess from standard aperture-colour relations for early-type galaxies. Secondly, millimetre and radio observations of galactic CO and H I have been used to calculate the total hydrogen column density along the line-of-sight, and thereby estimate the colour excess from the local dust-to-gas ratio. After consideration of all extinction measurements to date, it is concluded that A_V=5.0 ± 0.2 mag. The isophotal diameter and the corrected apparent visual magnitude are estimated to be ~ 15 arcmin and ~ 6.3 respectively (assuming type E), making Maffei 1 one of the biggest and brightest galaxies in the sky. The distance is found to be 2.1^+1.3/_-0.8 Mpc, indicating that Maffei 1 is probably associated with the Ursa Major-Camelopardalis cloud, not the Local Group. The primary source of error in the distance is now the uncertainty in the central velocity dispersion. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject Galaxy Maffei 1 en_US
dc.title The Galactic Extinction towards Maffei 1 en_US
dc.type text en_US
dc.rights.holder Oxford University Press en_US

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