NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T16:40:36 PDT
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For refcode 1936ApJ....83...10H:
Retrieve 101 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1936ApJ....83...10H The Apparent Radial Velocities of 100 Extragalactic Nebulae M. L. Humason Abstract New velocities of 100 nebulae are given in Table I. With the exception of 6, they are all velocities of recession, ranging from +50 km/sec, for a member of the Virgo Cluster, to +42,000 km/sec for a member of the Ursa Major Cluster No.2. In the Virgo Cluster 25 new velocities have been obtained, 9 of them by Sinclair Smith. These, with velocities previously known, show an average range of 500 km/sec around a mean of +1200 km/sec. Magnitudes range from 10.0 to 15.0. The mean velocity of the fainter members is approximately the same as the brighter. Late-type spirals (Sc) are decidely bluer than E, Sa or Sb nebulae. The mean spectral type for these groups is: E0-7, G3.6; Sa, G3.4; Sb, G1.6; Sc, F8.8. Velocities of the order of +40,000 km/sec have been observed in the Bootes Cluster and in the Ursa Major Cluster No. 2. These values are consistent with estimates of the distance by Hubble and Baade (about 70 million parsecs for both clusters) and indicate that the velocity-distance relation is still sensibly linear to this distance.
Retrieve 101 NED objects in this reference.
Please click here for ADS abstract

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