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Messier 105

Messier 105
M105, as viewed by the HST;
Credit: NASA/ESA
Observation data (J2000 epoch)
Constellation Leo
Right ascension 10h 47m 49.6s[1]
Declination +12° 34′ 54″[1]
Redshift 911 ± 2 km/s[1]
Distance 32.0 ± 1.6 Mly (9.8 ± 0.5 Mpc)[2]
Type E1[1]
Apparent dimensions (V) 5′.4 × 4′.8[1]
Apparent magnitude (V) 10.2[1]
Other designations
NGC 3379,[1] UGC 5902,[1] PGC 32256[1]

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


  • History 1
  • Properties 2
  • Galaxy group information 3
  • References 4
  • External links 5


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

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".  
  3. ^ a b K. G. Jones (1991). Messier's Nebulae and Star Clusters (2nd ed.).  
  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".  
  5. ^ Ford, Alyson; Bregman, J. N. (2012). "Detection of Ongoing, Low-Level Star Formation in Nearby Ellipticals". American Astronomical Society 219.  
  6. ^ R. B. Tully (1988). Nearby Galaxies Catalog.  
  7. ^ Fouque, P.; Gourgoulhon, E.; Chamaraux, P.; Paturel, G. (1992). "Groups of galaxies within 80 Mpc. II – The catalogue of groups and group members".  
  8. ^ A. Garcia (1993). "General study of group membership. II – Determination of nearby groups".  
  9. ^ G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups".  
  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.  

External links

  • Messier 105 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
  • "StarDate: M105 Fact Sheet"
  • SEDS: Elliptical Galaxy M105
  • ESA/Hubble image of M105
  • Gray, Meghan; Merrifield, Michael. "M105 – Elliptical Galaxy". Deep Space Videos.  

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