NASA/IPAC EXTRAGALACTIC DATABASE
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NED object is MESSIER 081; Reference is 1977MNRAS.178..577C
Figure 1. The low-resolution (4 arcmin) integrated hydrogen contour map with
schematic representations of some optical features. The map does not include
hydrogen with velocities less than +21 km per second. This cut-off has no
effect on the map of the bridge or the distribution around M82 because no H I
was detected in these regions at radial velocities lower than +21 km per
second. The dashed ellipses correspond to the Holmberg dimensions of M81 and
M82, respectively 35 X 14 and 13 X 8 arcmin. The upper cross is the position
of the centroid of continuum emission in M82 ({alpha},_1950.0 = 09h 51m
42.63s; {delta},_1950.O = 69deg 55arcmin 2.03arcsec), and the lower cross is
the position of the nucleus of M81 given by van der Kruit (1974)
({alpha}_1950.0 = 09 51m 27.2s; {delta},_1950.O = 69deg 18arcmin 08.3arcsec).
The faint Arp ring-feature is also indicated.
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