NGC 1515

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NGC 1515
NGC1515 - Iotw2152a.jpg
NGC 1515 by the Víctor M. Blanco Telescope at Cerro Tololo Inter-American Observatory
Observation data (J2000 epoch)
Constellation Dorado
Right ascension 04h 04m 02.7s [1]
Declination −54° 06′ 01″ [1]
Redshift 0.003920 ± 0.000023 [1]
Heliocentric radial velocity 1,175 ± 7 km/s [1]
Distance 56.7 ± 6.9 Mly (17.4 ± 2.1 Mpc) [1]
Group or cluster Dorado Group
Apparent magnitude  (V)11.3 [2]
Characteristics
Type SAB(s)bc [1]
Apparent size  (V)5.2′ × 1.1′ [1]
Other designations
ESO 156- G 036, AM 0402-541, IRAS 04028-5414, PGC 14397

NGC 1515 is a spiral galaxy in the constellation Dorado. The galaxy lies about 55 million light years away from Earth, which means, given its apparent dimensions, that NGC 1515 is approximately 100,000 light years across. [1] It was discovered by James Dunlop on November 5, 1826. [3] It is a member of the Dorado Group.

Contents

Characteristics

NGC 1515 is seen highly inclined. It has multiple spiral arms with fragments of dust lanes. The galactic nucleus is small, while the bulge seems to extend over the galactic plane. It is X-shaped (this shape is also referred to as peanut or box-shaped). There is evidence of a bar. [4] Some HII regions are visible in the arms. [5]

The galaxy appears deficient in hydrogen. [6] The total hydrogen mass is estimated to be 5.2×108 M☉, about ten times less than predicted. The hydrogen radius of the galaxy is 70% less than the optical one and there is no significant diffuse hydrogen emission around the galaxy. The galaxy probably lost most of its hydrogen as it passed through the centre of its galaxy group. [7]

In the centre of the galaxy is predicted to lie a supermassive black hole whose mass is estimated to be between 3.2 and 17 million solar masses, based on the spiral arm pitch angle. [8]

Nearby galaxies

NGC 1515 is a member of the Dorado Group, which consists of at least 46 members, and is part of the NGC 1566 subgroup. NGC 1515 is relatively isolated from the other members. [6] A dwarf galaxy is located within 200 kiloparsecs. [7] NGC 1515A lies 2 arcminutes away from the galaxy, [9] however its redshift is about ten times higher and the pairing is just visual. [3]

References

  1. 1 2 3 4 5 6 7 8 "NASA/IPAC Extragalactic Database". Results for NGC 1515. Retrieved 1 February 2025.
  2. ↑ "Revised NGC Data for NGC 1515". spider.seds.org. Retrieved 30 March 2024.
  3. 1 2 Seligman, Courtney. "NGC 1515 (= PGC 14397)". Celestial Atlas. Retrieved 19 November 2018.
  4. ↑ Choi, Young-Jun; Park, Byeong-Gon; Seog Yoon, Tae; Ann, Hong Bae (1 October 1998). "Surface Photometry of Three Spiral Galaxies : ESO 598-G0O9, NGC 1515 and NGC 7456" (PDF). Journal of Korean Astronomical Society. 31: 141–160. ISSN   1225-4614.
  5. ↑ Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  6. 1 2 Kilborn, V. A.; Koribalski, B. S.; Forbes, D. A.; Barnes, D. G.; Musgrave, R. C. (1 January 2005). "A wide-field HI study of the NGC 1566 group". Monthly Notices of the Royal Astronomical Society. 356 (1): 77–88. arXiv: astro-ph/0409743 . doi: 10.1111/j.1365-2966.2004.08450.x .
  7. 1 2 Dénes, H.; Kilborn, V. A.; Koribalski, B. S.; Wong, O. I. (11 January 2016). "H i-deficient galaxies in intermediate-density environments". Monthly Notices of the Royal Astronomical Society. 455 (2): 1294–1308. arXiv: 1510.05343 . doi: 10.1093/mnras/stv2391 .
  8. ↑ Davis, Benjamin L.; Berrier, Joel C.; Johns, Lucas; Shields, Douglas W.; Hartley, Matthew T.; Kennefick, Daniel; Kennefick, Julia; Seigar, Marc S.; Lacy, Claud H. S. (20 June 2014). "The Black Hole Mass Function Derived from Local Spiral Galaxies". The Astrophysical Journal. 789 (2): 124. arXiv: 1405.5876 . doi:10.1088/0004-637X/789/2/124.
  9. ↑ de Vaucouleurs, Gerard Henri; de Vaucouleurs, Antoinette; Shapley, Harlow (1964). Reference catalogue of bright galaxies. Austin: University of Texas Press. Bibcode:1964rcbg.book.....D.
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