|Messier 90 imaged by the Hubble Space Telescope|
|Right ascension||12h 36m 49.8s|
|Declination||+13° 09′ 46″|
|Apparent dimension (V)||9.5 × 4.4 moa|
|Apparent magnitude (V)||10.26|
|Type||SAB(rs)ab, LINER, Sy|
|Heliocentric radial velocity||−235 ± 4km/s|
|Redshift||-0.000784 ± 0.000013|
|Galactocentric velocity||−282 ± 4 km/s|
|Distance||58.7 ± 2.8 Mly (18.00 ± 0.86 Mpc)|
|SIMBAD||Search M90 data|
|See also: Galaxy, List of galaxies|
Membership of the Virgo Cluster
Messier 90 is a member of the Virgo Cluster. and one of its largest and brightest spiral galaxies, with an absolute magnitude of around -22 (brighter than the Andromeda Galaxy). The galaxy is located approximately 1°.5 away from the subgroup centered on Messier 87. As a consequence of the galaxy's interaction with the intracluster medium in the Virgo Cluster, the galaxy has lost much of its 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 severely truncated compared to similar galaxies outside the Virgo Cluster and there're even H II regions outside the galactic plane.
Star formation activity
As stated above, the 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., which justifies why this galaxy, along with NGC 4921 in the Coma Cluster has been classified as the prototype of an anemic galaxy. Some authors go even further and consider it is a passive spiral galaxy, similar to those found on galaxy clusters with high redshift.
However, the center of Messier 90 appears to be a site of significant star formation activity, where around 5*104 stars of spectral types O and B that formed around 5-6 million years ago are surrounded by a large amount of A-type supergiants that were born in other starburst that took place before the former, between 15 and 30 million years ago.
Multiple supernovae (up to 105) in the nucleus have produced 'superwinds' that are blowing the galaxy's interstellar medium outward into the intracluster medium. collimated in two jets, one of which is being disturbed by interaction with Virgo's intracluster medium as the galaxy moves through it.
The spectrum of Messier 90 is blueshifted, which indicates that it is moving towards the Earth. In contrast, the spectra of most other galaxies are 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.
- Messier 64, a similar spiral galaxy.
- ^ Tschöke et al. 2001 uses a Hubble constant of 75 (km/s)/Mpc to estimate a distance of 16.8 Mpc to NGC 4569. Adjusting for the 2006 value of 70+2.4
−3.2 (km/s)/Mpc we get a distance of 18.0+0.9
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- R. A. Koopmann; J. D. P. Kenney (2004). "Hα Morphologies and Environmental Effects in Virgo Cluster Spiral Galaxies". Astrophysical Journal 613 (2): 866–885. arXiv:astro-ph/0406243. Bibcode:2004ApJ...613..866K. doi:10.1086/423191.
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- Gabel, J. R.; Bruhweiler, F. C. (2002). "The Central Starburst and Ionization Mechanism in the LINER/H II Region Transition Nucleus in NGC 4569". The Astronomical Journal 124 (2): 737–750. arXiv:astro-ph/0204371. Bibcode:2002AJ....124..737G. doi:10.1086/341376.
- Chyży, K. T.; Soida, M.; Bomans, D. J.; Vollmer, B.; et al. (2006). "Large-scale magnetized outflows from the Virgo Cluster spiral NGC 4569. A galactic wind in a ram pressure wind". Astronomy & Astrophysics 447 (2): 465–472. Bibcode:2006A&A...447..465C. doi:10.1051/0004-6361:20053819.
- D. Tschöke; D. J. Bomans; G. Hensler; N. Junkes (2001). "Hot halo gas in the Virgo cluster galaxy NGC 4569". Astronomy and Astrophysics 380 (1): 40–54. Bibcode:2001A&A...380...40T. doi:10.1051/0004-6361:20011354.
- Kenney, J. D. P.; Crowl, H.; van Gorkom, J.; Vollmer, B. (2004). "Spiral Galaxy - ICM Interactions in the Virgo Cluster". International Astronomical Union Symposium no. 217: 370. arXiv:astro-ph/0403129. Bibcode:2004IAUS..217..370K.
- SEDS: Spiral Galaxy M90
- Messier 90 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images