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NGC 7507

NGC 7507
NGC 7507 (2MASS)
Observation data (J2000 epoch)
ConstellationSculptor
Right ascension23h 12m 07.595s[1]
Declination−28° 32′ 22.70″[1]
Redshift0.005260±0.000100[2]
Heliocentric radial velocity1,590±21 km/s[3]
Distance80.07 ± 0.46 Mly (24.55 ± 0.14 Mpc)[4]
Apparent magnitude (V)10.6[5]
Apparent magnitude (B)11.60[6]
Characteristics
TypeE0[7]
Mass2×1011[8] M☉
Size91 kly[5]
Apparent size (V)1.987′ × 1.907′[1] (NIR)
Other designations
NGC 7507, LEDA 70676, MCG -05-54-022; ESO 469-19, AM 2309-284[9]

NGC 7507 is an elliptical galaxy located in the constellation Sculptor. It was discovered by the German-British astronomer William Herschel on October 30, 1783.[10] The galaxy lies at an estimated distance of 80.1 million light-years (24.55 Mpc) from the Milky Way,[4] and has an angular size of 2.0′ × 1.9′ in the near infrared.[1] It is receding with a heliocentric radial velocity of 1,590 km/s.[3]

The morphological classification of NGC 7507 is E0, indicating an elliptical galaxy with an almost perfectly circular profile. This massive galaxy is fairly isolated, although it forms a pair with the barred spiral galaxy NGC 7513.[8] The latter lies at a projected angular separation of 18′.[11] Apart from a central dust lane, NGC 7507 displays neither shells nor tidal features.[11] The stellar halo has two components, with the outer and inner halos counter-rotating.[12]

It is unusual galaxy in that it displays a negligible dark matter profile, showing a constant mass to light ratio.[8] This apparent lack of a dark matter component is difficult to explain in an LCDM cosmology.[12] The globular cluster population around NGC 7507 is very small, being only a tenth the size of other comparable ellipticals. It more closely resembles the globular population of a spiral galaxy.[11]

References

  1. ^ a b c d Skrutskie, Michael F.; et al. (February 1, 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
  2. ^ Paturel, G.; et al. (2002). Comparison LEDA/SIMBAD octobre 2002. Catalogue to be published in 2003. Bibcode:2002LEDA.........0P.
  3. ^ a b Ogando, Ricardo L. C.; et al. (June 2008). "Line Strengths of Early-Type Galaxies". The Astronomical Journal. 135 (6): 2424–2445. arXiv:0803.3477. Bibcode:2008AJ....135.2424O. doi:10.1088/0004-6256/135/6/2424.
  4. ^ a b Tully, R. Brent; et al. (October 2013). "Cosmicflows-2: The Data". The Astronomical Journal. 146 (4): 25. arXiv:1307.7213. Bibcode:2013AJ....146...86T. doi:10.1088/0004-6256/146/4/86. S2CID 118494842. 86.
  5. ^ a b Simpson, Phil (2012). Guidebook to the Constellations: Telescopic Sights, Tales, and Myths. The Patrick Moore Practical Astronomy Series. Springer Science & Business Media. p. 800. ISBN 9781441969415.
  6. ^ Lauberts, A.; Valentijn, E. A. (1989). The Surface Photometry Catalogue of the ESO-Uppsala Galaxies. Bibcode:1989spce.book.....L.
  7. ^ "NASA/IPAC Extragalactic Database". Results for NGC 7507. Retrieved 2020-01-17.
  8. ^ a b c Salinas, R.; et al. (February 2012). "Kinematic properties of the field elliptical NGC 7507". Astronomy & Astrophysics. 538. id. A87. arXiv:1111.1581. Bibcode:2012A&A...538A..87S. doi:10.1051/0004-6361/201116517.
  9. ^ "NGC 7507". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-17.
  10. ^ Seligman, Courtney. "New General Catalog Objects: NGC 7500 - 7549". cseligman.com. Retrieved 2024-09-30.
  11. ^ a b c Caso, J. P.; et al. (July 2013). "The paucity of globular clusters around the field elliptical NGC 7507". Astronomy & Astrophysics. 555. id. A56. arXiv:1305.1335. Bibcode:2013A&A...555A..56C. doi:10.1051/0004-6361/201321032.
  12. ^ a b Lane, Richard R.; et al. (February 2015). "Dark matter deprivation in the field elliptical galaxy NGC 7507". Astronomy & Astrophysics. 574. id. A93. arXiv:1412.3402. Bibcode:2015A&A...574A..93L. doi:10.1051/0004-6361/201424074.
Quelle: https://en.wikipedia.org/wiki/NGC_7507