Messier Index/M90

Messier 90A a 256px Messier 90 w:J2000 VirgoR. W. Sinnott, editor The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer 1988 Sky Publishing Corporation and Cambridge University Press 0-933-34651-4 12 36 49.8NASA/IPAC Extragalactic Database Results for NGC 205 http://nedwww.ipac.caltech.edu/ 2006-02-01 +13 09 46 10.26 SAB(rs)ab, w:LINER, Sy NGC 4569, UGC 7786, PGC 42089, Arp 76 Messier 90 (also known as M90 and NGC 4569) is a w:spiral galaxy about 60 million w:light-years away in the w:constellation Virgo. It was discovered by w:Charles Messier in w:1781.K. G. Jones 1991 Messier's Nebulae and Star Clusters 2nd Cambridge University Press Cambridge 0-521-37079-5 Membership of the Virgo Cluster Messier 90 is a member of the w:Virgo Cluster. B. Binggeli, A. Sandage, G. A. Tammann Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area Astronomical Journal 1985 90 1681–1759 http://adsabs.harvard.edu/abs/1985AJ.....90.1681B 10.1086/113874 The galaxy is located approximately 1°.5 away from the subgroup centered on w:Messier 87.A. Sandage, J. Bedke 1994 Carnegie Atlas of Galaxies Carnegie Institution of Washington Washington, D.C. 0-87279-667-1 As a consequence of the galaxy's interaction with the w:intracluster medium in the Virgo Cluster, the galaxy has lost much of its w:interstellar medium. As a result of this process, which is referred to as ram pressure stripping, the galaxy's interstellar medium and star formation regions appear truncated compared to similar galaxies outside the Virgo Cluster. R. A. Koopmann, J. D. P. Kenney Hα Morphologies and Environmental Effects in Virgo Cluster Spiral Galaxies Astrophysical Journal 2004 613 866–885 http://adsabs.harvard.edu/abs/2004ApJ...613..866K 10.1086/423191 Star formation activity As stated above, the w:star formation in Messier 90 appears truncated. Consequently, the galaxy's spiral arms appear to be smooth and featureless, rather than knotted like galaxies with extended star formation. However, the center of Messier 90 appears to be a site of significant star formation activity. Multiple w:supernovae in the nucleus have produced 'superwinds' that are blowing the galaxy's interstellar medium outward into the intracluster medium.D. Tschöke, D. J. Bomans, G. Hensler, N. Junkes Hot halo gas in the Virgo cluster galaxy NGC 4569 Astronomy and Astrophysics 2001 380 40–54 http://adsabs.harvard.edu/abs/2001A&A...380...40T 10.1051/0004-6361:20011354 Blueshift The w:spectrum of Messier 90 is w:blueshifted, which indicates that it is moving towards the Earth. In contrast, the spectra of most other galaxies are w:redshifted. The blueshift was originally used to argue that Messier 90 was actually an object in the foreground of the Virgo Cluster. However, since the phenomenon was limited mostly to galaxies in the same part of the sky as the Virgo Cluster, it appeared that this inference based on the blueshift was incorrect. Instead, the blueshift is thought to be evidence for the large range in velocities of objects within the Virgo Cluster itself. Distance measurements Low levels of w:H I gas prevents using the w:Tully-Fisher relation to estimate the distance to Messier 90. Companion galaxies Messier 90 has a w:satellite galaxy (w:IC 3583) which is an w:irregular galaxyFebruary 2007. External links SEDS: Spiral Galaxy M90 Notes A aTschöke Bomans Hensler Junkes 2001 uses a w:Hubble constant of 75 (km/s)/Mpc to estimate a distance of 16.8 Mpc to NGC 4569. Adjusting for the 2006 value of 702.4 3.2 (km/s)/Mpc we get a distance of 18.00.9 0.6 Mpc. References