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NGC 4775

NGC 4775
NGC 4775 imaged by the Legacy Surveys
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension12h 53m 45.7048s[1]
Declination−06° 37′ 20.669″[1]
Redshift0.005224 ± 0.000002 [1]
Heliocentric radial velocity1,566 ± 1 km/s[1]
Distance53.1 ± 23.9 Mly (16.3 ± 7.3 Mpc)[1]
Group or clusterNGC 4699 Group
Apparent magnitude (V)11.1[2]
Characteristics
TypeSA(s)d [1]
Size~34,000 ly (10.4 kpc) (estimated)[1]
Apparent size (V)2.1′ × 2.0′ [1]
Other designations
IRAS 12511-0621, UGCA 306, MCG -01-33-043, PGC 43826[1]

NGC 4775 is a barred spiral galaxy in the constellation Virgo. The galaxy lies about 55 million light years away from Earth, which means, given its apparent dimensions, that NGC 4775 is approximately 35,000 light years across.[1] It was discovered by William Herschel on April 25, 1784.[3]

NGC 4775 has a small elliptical galactic bulge. The galaxy has faint and diffuse spiral arms. The pattern is asymmetric, with a very open and broad arm emerging from the southeast part of the disk and can be traced for about half a revolution. The other arm is very short but brighter. No clear pattern is discernible in the inner disk.[4] There are many HII regions in the arms of NGC 4775 the largest of which is complex and about 4 arcseconds across.[5] The nucleus hosts young stars but it is surrounded by older stars. The nucleus has higher metallicity than the rest of the galaxy.[6] In the nucleus lies a nuclear star cluster which is 2.2 arcseconds across.[7]

NGC 4775 is a member of the NGC 4697 Group, also known as LGG 314.[8][9] Other members of the group include NGC 4697, NGC 4731, NGC 4941, NGC 4951, NGC 4948, and NGC 4958.[9] It is part of a Virgo II Groups, a chain of groups extending from the Virgo Cluster.[10]

References

  1. ^ a b c d e f g h i j "Results for object NGC 4775". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 25 February 2025.
  2. ^ "Revised NGC Data for NGC 4775". spider.seds.org. Retrieved 30 March 2024.
  3. ^ Seligman, Courtney. "NGC 4775 (= PGC 43826)". Celestial Atlas. Retrieved 19 November 2018.
  4. ^ Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near-Infrared and Optical Morphology of Spiral Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 73–111. arXiv:astro-ph/0206320. Bibcode:2002ApJS..143...73E. doi:10.1086/342340.
  5. ^ Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  6. ^ Ganda, Katia; Peletier, Reynier F.; McDermid, Richard M.; Falcón-Barroso, Jesús; De Zeeuw, P. T.; Bacon, Roland; Cappellari, Michele; Davies, Roger L.; Emsellem, Eric; Krajnović, Davor; Kuntschner, Harald; Sarzi, Marc; Van De Ven, Glenn (September 2007). "Absorption-line strengths of 18 late-type spiral galaxies observed with SAURON". Monthly Notices of the Royal Astronomical Society. 380 (2): 506–540. arXiv:0706.3624. Bibcode:2007MNRAS.380..506G. doi:10.1111/j.1365-2966.2007.12121.x.
  7. ^ Georgiev, Iskren Y.; Böker, Torsten; Leigh, Nathan; Lützgendorf, Nora; Neumayer, Nadine (1 April 2016). "Masses and scaling relations for nuclear star clusters, and their co-existence with central black holes". Monthly Notices of the Royal Astronomical Society. 457 (2): 2122–2138. doi:10.1093/mnras/stw093.
  8. ^ Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025. Retrieved 1 February 2025.
  9. ^ a b Garcia, A. M. (1 July 1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G. ISSN 0365-0138.
  10. ^ "The Virgo II Groups". www.atlasoftheuniverse.com. Retrieved 25 February 2025.
Quelle: https://en.wikipedia.org/wiki/NGC_4775