Messier 105

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Messier 105
Messier 105.jpg
M105, as viewed by the HST;
Credit: NASA/ESA
Observation data (J2000 epoch)
Right ascension10h 47m 49.6s[1]
Declination+12° 34′ 54″[1]
Redshift911 ± 2 km/s[1]
Distance32.0 ± 1.6 Mly (9.8 ± 0.5 Mpc)[2]
Apparent magnitude (V)10.2[1]
Apparent size (V)5′.4 × 4′.8[1]
Other designations
NGC 3379,[1] UGC 5902,[1] PGC 32256[1]
See also: Galaxy, List of galaxies

Messier 105 (also known as M105 and NGC 3379) is an elliptical galaxy in the constellation Leo.


Messier 105 was discovered by Pierre Méchain on 24 March 1781, just a few days after he discovered the nearby galaxies Messier 95 and Messier 96.[3] This galaxy is one of several that were not originally included in the original Messier Catalogue compiled by Charles Messier. Messier 105 was included in the catalog only when Helen S. Hogg found a letter by Méchain describing Messier 105 and when the object described by Méchain was identified as a galaxy previously named NGC 3379.[3]


Messier 105 is known to have a supermassive black hole whose mass is estimated to be between 1.4·108 and 2·108 solar masses.[4] It also contains a few young stars and stellar clusters, suggesting some elliptical galaxies still form new stars, but very slowly.[5]

Galaxy group information[edit]

Messier 105 is one of several galaxies within the M96 Group, a group of galaxies in the constellation Leo. The group also includes the Messier objects M95 and M96.[6][7][8][9]

This galaxy, along with its companion the barred lenticular galaxy NGC 3384, is surrounded by a large ring of neutral hydrogen with a radius of 200 kiloparsecs (650,000 light years) and a mass of 1,8*109 times the mass of the Sun where star formation has been detected.[10]


  1. ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for M105. Retrieved 2006-11-16.
  2. ^ Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; Liu, Michael C.; Rieke, Marcia J.; Ajhar, Edward A.; Blakeslee, John P. (2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal. 583 (2): 712–726. arXiv:astro-ph/0210129. Bibcode:2003ApJ...583..712J. doi:10.1086/345430.
  3. ^ a b K. G. Jones (1991). Messier's Nebulae and Star Clusters (2nd ed.). Cambridge University Press. ISBN 0-521-37079-5.
  4. ^ Shapiro, Kristen L.; Cappellari, Michele; de Zeeuw, Tim; McDermid, Richard M.; Gebhardt, Karl; van den Bosch, Remco C. E.; Statler, Thomas S. (2006). "The black hole in NGC 3379: a comparison of gas and stellar dynamical mass measurements with HST and integral-field data". Monthly Notices of the Royal Astronomical Society. 370 (2): 559–579. arXiv:astro-ph/0605479. Bibcode:2006MNRAS.370..559S. doi:10.1111/j.1365-2966.2006.10537.x.
  5. ^ Ford, Alyson; Bregman, J. N. (2012). "Detection of Ongoing, Low-Level Star Formation in Nearby Ellipticals". American Astronomical Society. 219: 102.03. Bibcode:2012AAS...21910203F.
  6. ^ R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge University Press. ISBN 0-521-35299-1.
  7. ^ Fouque, P.; Gourgoulhon, E.; Chamaraux, P.; Paturel, G. (1992). "Groups of galaxies within 80 Mpc. II – The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.
  8. ^ A. Garcia (1993). "General study of group membership. II – Determination of nearby groups". Astronomy and Astrophysics Supplement. 100: 47–90. Bibcode:1993A&AS..100...47G.
  9. ^ G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070.
  10. ^ Thilker, David A.; Donovan, Jennifer; Schiminovich, David; Bianchi, Luciana; Boissier, Samuel; Gil de Paz, Armando; Madore, Barry F.; Martin, D. Christopher; Seibert, Mark (2009). "Massive star formation within the Leo 'primordial' ring". Nature. 457 (7232): 990–993. Bibcode:2009Natur.457..990T. doi:10.1038/nature07780. PMID 19225520.

External links[edit]

Coordinates: Sky map 10h 47m 49.6s, +12° 34′ 54″