Astronomy:NGC 5398
| NGC 5398 | |
|---|---|
| File:NGC5398 - HST - Potw1737a.tiff NGC 5398 imaged by the Hubble Space Telescope; Tol 89 is the pale red patch to the lower left of center | |
| Observation data (J2000 epoch) | |
| Constellation | Centaurus |
| Right ascension | 14h 01m 21.555s[1] |
| Declination | −33° 03′ 49.62″[1] |
| Helio radial velocity | 1,219 km/s[2] |
| Galactocentric velocity | 1,085 km/s[2] |
| Distance | 27.8 Mly (8.5 Mpc)[3] |
| Apparent magnitude (V) | 12.6[4] |
| Characteristics | |
| Type | SB(rs)dm[4] |
| Apparent size (V) | 2.8′ × 1.7′[4] (D25) |
| Other designations | |
| IRAS 13584-3249, NGC 5398, MCG-05-33-037, PGC 49923[5][4] | |
NGC 5398 is a barred spiral galaxy in the southern constellation of Centaurus. It was discovered June 3, 1836 by John Herschel.[6] Distance estimates range from 5.39 Mpc to 18.30 Mpc. The tip of the red-giant branch method yields a distance of 11.6 Mpc,[7] while the Tully–Fisher relation shows values of around 8.5 Mpc.[3] It is receding with a heliocentric radial velocity of 1,219 km/s.[2]
The morphological class of NGC 5398 is SB(rs)dm,[8] indicating this is a spiral galaxy with an inner bar (SB) and incomplete ring (rs) structures, plus broken, irregular spiral arms (dm). The galactic plane is inclined at an angle of 53° to the line of sight from the Earth. The oval outline of the disk has an angular size of 2.8′ × 1.7′ at a limiting magnitude of 25, with the major axis aligned along a position angle of 172°.[9]
At the southwestern end of the bar lies a giant H II region (GHR) designated Tol 89. It spans a region of 1.7 × 1.2 kpc with an absolute magnitude of −14.8 in the B (blue) band, making it "one of the most impressive GHRs known". This is the only large site in NGC 5398 that is undergoing star formation, and it suggests that NGC 5398 is engaged in some form of interaction.[10][11][12]
See also
References
- ↑ 1.0 1.1 Skrutskie, Michael F. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S.
- ↑ 2.0 2.1 2.2 Tully, R. Brent et al. (2016). "Cosmicflows-3". The Astronomical Journal 152 (2): 21. doi:10.3847/0004-6256/152/2/50. 50. Bibcode: 2016AJ....152...50T.
- ↑ 3.0 3.1 Lianou, S. et al. (November 2019). "Dust properties and star formation of approximately a thousand local galaxies". Astronomy & Astrophysics 631: 19. doi:10.1051/0004-6361/201834553. A38. Bibcode: 2019A&A...631A..38L.
- ↑ 4.0 4.1 4.2 4.3 "NASA/IPAC Extragalactic Database". Results for NGC 5398. http://nedwww.ipac.caltech.edu/.
- ↑ "NGC 5398". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5398.
- ↑ Seligman, Courtney. "NGC Objects: NGC 5350 - 5399". Celestial Atlas. https://cseligman.com/text/atlas/ngc53a.htm#5398.
- ↑ McQuinn, Kristen B. W. et al. (August 2017). "Accurate Distances to Important Spiral Galaxies: M63, M74, NGC 1291, NGC 4559, NGC 4625, and NGC 5398". The Astronomical Journal 154 (2): 13. doi:10.3847/1538-3881/aa7aad. 51. Bibcode: 2017AJ....154...51M.
- ↑ Buta, R. (January 1995). "The Catalog of Southern Ringed Galaxies". Astrophysical Journal Supplement 96: 39. doi:10.1086/192113. Bibcode: 1995ApJS...96...39B.
- ↑ Linden, S. T. et al. (June 2020). "The Star Formation in Radio Survey: 3-33 GHz Imaging of Nearby Galaxy Nuclei and Extranuclear Star-forming Regions". The Astrophysical Journal Supplement Series 248 (2): 25. doi:10.3847/1538-4365/ab8a4d. 25. Bibcode: 2020ApJS..248...25L.
- ↑ Sidoli, Fabrizio et al. (August 2006). "The massive star population in the giant HII region Tol89 in NGC 5398". Monthly Notices of the Royal Astronomical Society 370 (2): 799–818. doi:10.1111/j.1365-2966.2006.10504.x. Bibcode: 2006MNRAS.370..799S.
- ↑ Johnson, K. E. et al. (December 2002). "Searching for Embedded Super Star Clusters in IC4662, NGC1705, and NGC5398". Bulletin of the American Astronomical Society 34: 1238. 81.02. Bibcode: 2002AAS...201.8102J.
- ↑ Durret, F. et al. (February 1985). "Gas and star content and spatial distribution in the giant extragalactic H II region TOL 89". Astronomy and Astrophysics 143: 347–354. Bibcode: 1985A&A...143..347D.
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