NGC 1549
| NGC1549 | |
|---|---|
 NGC 1549 (top) andNGC 1553(bottom) bylegacy surveys | |
| Observation data (J2000epoch) | |
| Constellation | Dorado |
| Right ascension | 04h15m45.1s[1] |
| Declination | −55° 35′ 32″[1] |
| Redshift | 0.004190 ± 0.000040[1] |
| Heliocentric radial velocity | 1,256 ± 12km/s[1] |
| Distance | 51.2± 14Mly(15.7 ± 4.4Mpc)[1] |
| Grouporcluster | Dorado Group |
| Apparent magnitude(V) | 9.6 |
| Characteristics | |
| Type | E0-1[1] |
| Apparent size(V) | 4.9′× 4.1′[1] |
| Other designations | |
| ESO 157-G16, AM 0414-554,PGC14757[1] | |
NGC 1549is anelliptical galaxylocated in the constellationDorado.It is located at a distance of about 50 millionlight yearsfrom Earth, which, given its apparent dimensions, means that NGC 1549 is about 75,000 light years across. NGC 1549 was discovered byJohn Herschelon 6 December 1835 and may have been observed byJames Dunlopin 1826.[2]It is a member of theDorado Group.
In the centre of NGC 1549 is expected to lie asupermassive black hole,whose mass is estimated to be between 390 and 810 million (108.76+0.15
−0.17)M☉based on theSérsic indexof the galaxy.[3]Nopolycyclic aromatic hydrocarbons(PAHs) emission, an indicator for the presence of interstellar dust, was detected by the InfraredSpectrographonboardSpitzer Space Telescope.[4]NGC 1549 has been found to emitX-rays,with its total flux exceeding2×1040ergs s–1 for the 0.3–5 keV band.[5]A total number of 150globular clustersare estimated to exist in NGC 1549, a number low compared to similar size galaxies.[6]The outerisophotesof the galaxy appear twisted and feature faint shells.[7]
NGC 1549 forms an interacting pair with the lenticular galaxyNGC 1553,which lies 12 arcminutes to the south.[8]It is the largest elliptical galaxy in a moderate sizegalaxy groupknown as theDorado Group.[9]
References
[edit]- ^abcdefgh"NASA/IPAC Extragalactic Database".Results for NGC 1549.Retrieved2016-01-18.
- ^Seligman, Courtney."NGC 1549 (= PGC 14757)".Celestial Atlas.Retrieved19 November2018.
- ^Mutlu-Pakdil, Burçin; Seigar, Marc S.; Davis, Benjamin L. (17 October 2016)."The local black hole mass function derived from the MBH-P and the MBH-n relations".The Astrophysical Journal.830(2): 117.arXiv:1607.07325.Bibcode:2016ApJ...830..117M.doi:10.3847/0004-637X/830/2/117.S2CID118586684.
- ^Kaneda, H.; Onaka, T.; Sakon, I.; Kitayama, T.; Okada, Y.; Suzuki, T. (September 2008). "Properties of Polycyclic Aromatic Hydrocarbons in Local Elliptical Galaxies Revealed by the Infrared Spectrograph on Spitzer".The Astrophysical Journal.684(1): 270–281.arXiv:0805.3257.Bibcode:2008ApJ...684..270K.doi:10.1086/590243.S2CID14065147.
- ^Diehl, Steven; Statler, Thomas S. (10 October 2007). "The Hot Interstellar Medium of Normal Elliptical Galaxies. I. A Chandra Gas Gallery and Comparison of X-Ray and Optical Morphology".The Astrophysical Journal.668(1): 150–167.arXiv:astro-ph/0606215.Bibcode:2007ApJ...668..150D.doi:10.1086/521009.S2CID14507041.
- ^Bridges, Terry J.; Hanes, David A. (April 1990). "Globular clusters in the interacting galaxies NGC 1549 and NGC 1553".The Astronomical Journal.99:1100.Bibcode:1990AJ.....99.1100B.doi:10.1086/115399.
- ^Franx, Marijn; Illingworth, Garth; Heckman, Timothy (August 1989)."Multicolor surface photometry of 17 ellipticals"(PDF).The Astronomical Journal.98:538.Bibcode:1989AJ.....98..538F.doi:10.1086/115157.hdl:1887/6554.
- ^de Vaucouleurs, G.; de Vaucouleurs, A.; Corwin, J. R. (1976). "Second reference catalogue of bright galaxies".Second Reference Catalogue of Bright Galaxies.1976.Bibcode:1976RC2...C......0D.
- ^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.Bibcode:2005MNRAS.356...77K.doi:10.1111/j.1365-2966.2004.08450.x.
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External links
[edit]
Media related toNGC 1549at Wikimedia Commons- NGC 1549 onWikiSky:DSS2,SDSS,GALEX,IRAS,Hydrogen α,X-Ray,Astrophoto,Sky Map,Articles and images
- NGC 1549 on SIMBAD
