| NGC 5173 | |
|---|---|
 NGC 5173 imaged by the DESI Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Canes Venatici[1] |
| Right ascension | 13h 28m 25.280s[2] |
| Declination | +46° 35′ 29.89″[2] |
| Heliocentric radial velocity | 2,419 km/s[3] |
| Distance | 125 ± 23 Mly (38.3 ± 7.0 Mpc)[4] |
| Apparent magnitude (V) | 12.2[1] |
| Apparent magnitude (B) | 13.2[1] |
| Surface brightness | 12.2[1] |
| Characteristics | |
| Type | SA[3] |
| Apparent size (V) | 1.191′ × 1.066′[5] |
| Other designations | |
| NGC 5173, UGC 8468, LEDA 47257, MCG +08-25-005, PGC 47257[6][3] | |
NGC 5173 is a peculiar elliptical galaxy in the northern constellation of Canes Venatici. It was discovered May 12, 1787 by German-British astronomer William Herschel.[7] This galaxy has an apparent visual magnitude of 12.2,[1] and spans an angular size of 1.2′ × 1.1′.[5] It is the second brightest member of a small group of galaxies, with the brightest being NGC 5198; it lies at the eastern edge of its group.[8] NGC 5171 is separated from the nearby Sb galaxy NGC 5169 by just 5.5′, and they have a velocity difference of 17 km/s.[9]
Originally, this was classified by de Vaucouleurs as an elliptical galaxy, having a morphological classification of E0:[10] which indicates a spherically-symmetric shape.[11] In 1984, neutral hydrogen gas was discovered in NGC 5171, with a mass estimated at ~109 M☉ being about double that of gas-rich ellipticals.[11]
Observations reported in 1991 showed the presence of a star-forming spiral structure[8][10] located off-center from the galaxy isophotes.[3] This may be the remnant of an accreted galaxy similar to the Large Magellanic Cloud,[8] with at least 10–20% of the original galaxy's mass.[12] The disk has a radial extent of about 3.5 to 9.5 kpc.[8] Massive clusters have formed in this disk over the last 400 Myr.[12] Observations with the Hubble Space Telescope show filamentary structures at the center of the galaxy.[13]
References
- ^ a b c d e Frommert, Hartmut, Revised NGC Data for NGC 5173, Students for the Exploration and Development of Space, retrieved 2025-01-11.
- ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d Buta, Ronald J. (September 2019), "The systematics of galaxy morphology in the comprehensive de Vaucouleurs revised Hubble-Sandage classification system: application to the EFIGI sample", Monthly Notices of the Royal Astronomical Society, 488 (1): 590–608, arXiv:1906.08124, Bibcode:2019MNRAS.488..590B, doi:10.1093/mnras/stz1693.
- ^ Burke, Colin J.; et al. (January 2025), "Multiwavelength Constraints on the Local Black Hole Occupation Fraction", The Astrophysical Journal, 978 (1), id. 77, arXiv:2410.11177, Bibcode:2025ApJ...978...77B, doi:10.3847/1538-4357/ad94d9.
- ^ a b Moustakas, John; et al. (2023), "Siena Galaxy Atlas 2020", The Astrophysical Journal Supplement Series, 269 (1): 3, arXiv:2307.04888, Bibcode:2023ApJS..269....3M, doi:10.3847/1538-4365/acfaa2.
- ^ "NGC 5173", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2025-01-11.
- ^ Celigman, Courtney, "NGC Objects: NGC 5150 - 5199", Celestial Atlas, retrieved 2025-01-11.
- ^ a b c d Vader, J. P.; Vigroux, L. (June 1991), "A star-forming disk in the elliptical galaxy NGC 5173", Astronomy and Astrophysics, 246: 32, Bibcode:1991A&A...246...32V.
- ^ Bettoni, D.; et al. (2014), "The UV window on counter rotating ETGs: insight from SPH simulations with chemo-photometric implementation", Astrophysical Space Sci ence, 354: 83–88, doi:10.1007/s10509-014-1973-0.
- ^ a b Erroz-Ferrer, Santiago; et al. (December 21, 2013), "Massive star formation in galaxies with excess ultraviolet emission", Monthly Notices of the Royal Astronomical Society, 436 (4): 3135–3146, doi:10.1093/mnras/stt1797.
- ^ a b Knapp, G. R.; Raimond, E. (September 1984), "Detection of HI in the elliptical galaxy NGC 5173", Astronomy and Astrophysics, 138: 77–84, Bibcode:1984A&A...138...77K.
- ^ a b Sil’chenko, O. K.; et al. (2022), "Star Formation in the Elliptical (?) Galaxy NGC 5173", Astrophysical Bulletin, 77: 40–50, doi:10.1134/S1990341322010102.
- ^ Xilouris, E. M.; et al. (2004), "Dust emission in early-type galaxies: The mid-infrared view", Atronomy & Astrophysics, 416: 41–55, doi:10.1051/0004-6361:20034020.
