NGC 1549 explained

NGC 1549
Epoch:J2000
Type:E0-1 [1]
Dist Ly:51.2 ± 14 Mly (15.7 ± 4.4 Mpc)
Z:0.004190 ± 0.000040
H Radial V:1,256 ± 12 km/s
Appmag V:9.6
Size V:4.9 × 4.1
Group Cluster:Dorado Group
Constellation Name:Dorado
Names:ESO 157-G16, AM 0414-554, PGC 14757

NGC 1549 is an elliptical galaxy located in the constellation Dorado. It is located at a distance of about 50 million light years from Earth, which, given its apparent dimensions, means that NGC 1549 is about 75,000 light years across. NGC 1549 was discovered by John Herschel on 6 December 1835 and may have been observed by James Dunlop in 1826.[2] It is a member of the Dorado Group.

In the centre of NGC 1549 is expected to lie a supermassive black hole, whose mass is estimated to be between 390 and 810 million (10) based on the Sérsic index of the galaxy.[3] No polycyclic aromatic hydrocarbons (PAHs) emission, an indicator for the presence of interstellar dust, was detected by the Infrared Spectrograph onboard Spitzer Space Telescope.[4] NGC 1549 has been found to emit X-rays, with its total flux exceeding ergs s–1 for the 0.3–5 keV band.[5] A total number of 150 globular clusters are estimated to exist in NGC 1549, a number low compared to similar size galaxies.[6] The outer isophotes of the galaxy appear twisted and feature faint shells.[7]

NGC 1549 forms an interacting pair with the lenticular galaxy NGC 1553, which lies 12 arcminutes to the south.[8] It is the largest elliptical galaxy in a moderate size galaxy group known as the Dorado Group.[9]

External links

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 1549 . 2016-01-18 .
  2. Web site: Seligman . Courtney . NGC 1549 (= PGC 14757) . Celestial Atlas . 19 November 2018.
  3. Mutlu-Pakdil . Burçin . Seigar . Marc S. . Davis . Benjamin L. . The local black hole mass function derived from the MBH-P and the MBH-n relations . The Astrophysical Journal . 17 October 2016 . 830 . 2 . 117 . 10.3847/0004-637X/830/2/117. 2016ApJ...830..117M . 1607.07325 . 118586684 . free .
  4. Kaneda . H. . Onaka . T. . Sakon . I. . Kitayama . T. . Okada . Y. . Suzuki . T. . Properties of Polycyclic Aromatic Hydrocarbons in Local Elliptical Galaxies Revealed by the Infrared Spectrograph on Spitzer . The Astrophysical Journal . September 2008 . 684 . 1 . 270–281 . 10.1086/590243. 2008ApJ...684..270K . 0805.3257 . 14065147 .
  5. Diehl . Steven . Statler . Thomas S. . The Hot Interstellar Medium of Normal Elliptical Galaxies. I. A Chandra Gas Gallery and Comparison of X-Ray and Optical Morphology . The Astrophysical Journal . 10 October 2007 . 668 . 1 . 150–167 . 10.1086/521009. 2007ApJ...668..150D . astro-ph/0606215 . 14507041 .
  6. Bridges . Terry J. . Hanes . David A. . Globular clusters in the interacting galaxies NGC 1549 and NGC 1553 . The Astronomical Journal . April 1990 . 99 . 1100 . 10.1086/115399. 1990AJ.....99.1100B .
  7. Franx . Marijn . Illingworth . Garth . Heckman . Timothy . Multicolor surface photometry of 17 ellipticals . The Astronomical Journal . August 1989 . 98 . 538 . 10.1086/115157. 1989AJ.....98..538F . 1887/6554 . free .
  8. de Vaucouleurs, G. . de Vaucouleurs, A. . Corwin, J. R. . Second reference catalogue of bright galaxies . Second Reference Catalogue of Bright Galaxies . 1976 . 1976 . 1976RC2...C......0D.
  9. Kilborn . V. A. . Koribalski . B. S. . Forbes . D. A. . Barnes . D. G. . Musgrave . R. C. . A wide-field HI study of the NGC 1566 group . Monthly Notices of the Royal Astronomical Society . 1 January 2005 . 356 . 1 . 77–88 . 10.1111/j.1365-2966.2004.08450.x. 2005MNRAS.356...77K . astro-ph/0409743 .

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