Messier 90

Messier 90
Messier 90
Messier 90.jpg
Messier 90
Observation data
Epoch J2000
Constellation Virgo[1]
Right ascension 12h 36m 49.8s[2]
Declination +13° 09′ 46″[2]
Apparent dimension (V) 9.5 × 4.4 moa[2]
Apparent magnitude (V) 10.26[2]
Characteristics
Type SAB(rs)ab,[2] LINER,[2] Sy[2]
Astrometry
Helio Radial velocity -235 ± 4[2]km/s
Redshift -0.000784 ± 0.000013[2]
Galactocentric Velocity -282 ± 4[2] km/s
Distance 58.7 ± 2.8 Mly (18.0 ± 0.86 Mpc)
Other designations
NGC 4569,[2] UGC 7786,[2] PGC 42089,[2] Arp 76[2]
Database references
SIMBAD Search M90 data
See also: Galaxy, List of galaxies

Messier 90 (also known as M90 and NGC 4569) is a spiral galaxy about 60 million light-years away[a] in the constellation Virgo. It was discovered by Charles Messier in 1781.[3]

Contents

Membership of the Virgo Cluster

Messier 90 is a member of the Virgo Cluster.[4] The galaxy is located approximately 1°.5 away from the subgroup centered on Messier 87.[5] 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 truncated compared to similar galaxies outside the Virgo Cluster.[6]

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.[6] However, the center of Messier 90 appears to be a site of significant star formation activity. Multiple supernovae in the nucleus have produced 'superwinds' that are blowing the galaxy's interstellar medium outward into the intracluster medium.[7]

Blueshift

The spectrum of Messier 90 is blueshifted, which indicates that it is moving towards the Earth.[2] 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.[5]

Distance measurements

Low levels of H I gas prevents using the Tully-Fisher relation to estimate the distance to Messier 90.[7]

Companion galaxies

Messier 90 has PIE satellite galaxy (IC 3583) which is an irregular galaxy[citation needed].

See also

  • Messier 64, a similar spiral galaxy.

Notes

  1. ^ 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
    −0.6     Mpc.

References

  1. ^ R. W. Sinnott, ed (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation/Cambridge University Press. ISBN 0-933-34651-4. 
  2. ^ a b c d e f g h i j k l m n o "NASA/IPAC Extragalactic Database". Results for NGC 205. http://nedwww.ipac.caltech.edu/. Retrieved 2006-02-01. 
  3. ^ K. G. Jones (1991). Messier's Nebulae and Star Clusters (2nd ed.). Cambridge University Press. ISBN 0-521-37079-5. 
  4. ^ B. Binggeli, A. Sandage, G. A. Tammann (1985). "Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area". Astronomical Journal 90: 1681–1759. Bibcode 1985AJ.....90.1681B. doi:10.1086/113874. 
  5. ^ a b A. Sandage, J. Bedke (1994). Carnegie Atlas of Galaxies. Carnegie Institution of Washington. ISBN 0-87279-667-1. 
  6. ^ a b 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. 
  7. ^ a b 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. 

External links


v · d · eVirgo constellation
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α (Spica) • β (Zavijava) • γ (Porrima) • δ (Auva) • ε (Vindemiatrix) • ζ (Heze) • η (Zaniah) • θ • ι (Syrma) • κ • λ (Khambalia) • μ (Rijl al Awwa) • ν • ξ • ο • π • ρ • σ • τ • υ • φ • χ • ψ • ω • b • c • d¹ • d² • e • f • g • h • i • k • l • m • o • p • q • y • A¹ • A² • M
Flamsteed
1 (ω) • 2 (ξ) • 3 (ν) • 4 (A¹) • 5 (β, Zavijava) • 6 (A²) • 7 (b) • 8 (π) • 9 (ο) • 10 • 11 • 12 • 13 • 15 (η, Zaniah) • 16 (c) • 17 • 20 • 21 (q) • 25 (f) • 26 (χ) • 27 • 28 • 29 (γ, Porrima) • 30 (ρ) • 31 (d¹) • 32 (d²) • 33 • 34 • 35 • 37 • 38 • 40 (ψ) • 41 • 43 (δ, Auva) • 44 • 46 • 47 (ε, Vindemiatrix) • 48 • 49 • 50 • 51 (θ) • 53 • 54 • 55 • 56 • 57 • 59 (e) • 60 (σ) • 61 • 62 • 63 • 64 • 65 • 66 • 67 (α, Spica) • 68 (i) • 69 • 70 • 71 • 72 • 73 • ) • 75 • 76 (h) • 77 • ) • 79 (ζ, Heze) • 80 • 82 (m) • 83 • 84 • 85 • 86 • 87 • 89 • 90 (p) • 92 • 93 (τ) • 94 • 95 • 96 • 98 (κ) • 99 (ι, Syrma) • 100 (λ, Khambalia) • 102 (υ) • 104 • 105 (φ) • 106 • 107 (μ, Rijl al Awwa) • 108 • 109 • 110 • 2 Ser
Nearby
Ross 128 • Wolf 424 • FL (Wolf 424 B) • GL • Gliese 514 • Gliese 493.1 • Gliese 518 • Gliese 486 • GJ 1154 • 61 • GJ 3820
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See also
Wikipedia book Book:Messier objects · Category Category:Messier objects Portal Portal:Astronomy

Coordinates: Sky map 12h 36m 49.8s, +13° 09′ 46″


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