NGC 7507

NGC 7507
NGC 7507 (2MASS)
Observation data (J2000 epoch)
Constellation	Sculptor
Right ascension	23^h 12^m 07.595^s[1]
Declination	−28° 32′ 22.70″[1]
Redshift	0.005260±0.000100[2]
Heliocentric radial velocity	1,590±21 km/s[3]
Distance	80.07 ± 0.46 Mly (24.55 ± 0.14 Mpc)[4]
Apparent magnitude (V)	10.6[5]
Apparent magnitude (B)	11.60[6]
Characteristics
Type	E0[7]
Mass	2×10^11[8] M☉
Size	91 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. 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. 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. 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. 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. 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. 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. 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.