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An H I absorption line survey of Messier 31
(1988-08-01)
The 21-cm absorption through the disk of M31 has been observed, using the VLA to study the cool atomic phase of the interstellar medium in this nearby spiral galaxy. It is found that the abundance of diffuse clouds with ...
Dark matter in the dwarf galaxy II Zwicky 40
(1988-03-01)
H I observations of the blue compact dwarf galaxy II Zwicky 40 at high angular resolution reveal the presence of two kinematical systems. The H I structure and kinematics can be understood in terms of two interacting H I ...
A high resolution hydrogen-line survey of Messier 31. III : H I holes in the interstellar medium
(1986-11-01)
An analysis is carried out of H I holes in M 31 as detected with the Westerbork radiotelescope. The holes range from 100-1000 pc across and represent missing masses ranging from 1000-10 million solar masses, which would ...
A high resolution radio continuum survey of Messier 31. II : Observations at 1412 MHz, data reduction, and the 37W catalogue of radio sources
(1985-09-01)
The radio continuum emission of the spiral galaxy M31 has been mapped at a wavelength of 21 cm with the Westerbork Synthesis Radio Telescope, at an angular resolution of 23" x 35", corresponding to a linear resolution of ...
A high resolution hydrogen line survey of Messier 31. II : The warped flaring hydrogen layer
(1984-12-01)
Some of the global aspects of the H I distribution in M31 are discussed on the basis of the high-resolution survey of the 21-cm line made with the Westerbork Synthesis Radio Telescope by Brinks and Shane (1984). The ...
A high resolution radio continuum survey of Messier 31. I : Observations at 610 MHz, data reduction, and the 36W catalogue of radio sources
(1984-05-01)
High resolution observations of M31 at 610 MHz (49.2 cm), made with the Westerbork Synthesis Radio Telescope, are described. The observations and reduction of three full synthesis fields which, after combination, cover M31 ...
A high resolution hydrogen line survey of Messier 31. I : Observations and data reduction
(1984-02-01)
New observations with the Westerbork Synthesis Radio Telescope are presented of M31 in the 21 cm line of neutral atomic hydrogen. The observations and calibration are described, and the various stages of data reduction are ...
NGC 206, a hole in M31
(1981-02-01)
New high resolution 21 cm line observations of M31 show that the interstellar medium of this galaxy contains numerous holes in the H I distribution, some of which are clearly correlated with OB-associations. These holes ...