cD-galax
En cD-galax är en tung, mycket ljusstark galax av elliptisk typ som återfinns i centrum av rika galaxhopar. cD-galaxer skiljer sig från vanliga elliptiska galaxer genom en mycket omfattande halo av stjärnor.
Exempel på cD-galaxer
- Perseus A (NGC 1275) i stjärnbilden Perseus i galaxhopen Perseushopen (Abell 426).[1]
- NGC 6166 i stjärnbilden Herkules i galaxhopen Abell 2199.[2]
- IC 1101 i stjärnbilden Jungfrun i galaxhopen Abell 2029. Det är galaxen med den största kända diametern (runt 5.5 miljoner ljusår).[3][4][5]
- Messier 87 i stjärnbilden Jungfrun är centralgalax i Virgohopen.
- NGC 1399 i stjärnbilden Ugnen är centralgalax i Fornaxhopen.[6]
- NGC 4889 (Caldwell 35) i stjärnbilden Berenikes hår. Galaxen är den ljusaste i Comahopen.
- NGC 6086 i stjärnbilden Norra kronan.[7] Galaxen är den ljusaste i galaxhopen Abell 2162.[8]
- QSO 0957 i stjärnbilden Stora björnen är en kvasar som ledde till att den första gravitationslinsen identifierades.[9]
Referenser
Noter
- ^ Nature, "FIGURE 4. Optical, radio and X-ray images of the Perseus cluster." 9 July 2009, ISSN 0028-0836 ; EISSN 1476-4687 ; (accessed 15 April 2010)
- ^ Nature, "FIGURE 3. The entropy of the intracluster medium in spherical shells of radius r." 9 July 2009, ISSN 0028-0836 ; EISSN 1476-4687 ; (accessed 15 April 2010)
- ^ Science, "The Central Galaxy in Abell 2029: An Old Supergiant", Juan M. Uson, Stephen P. Boughn, and Jeffrey R. Kuhn, 26 October 1990, Vol. 250, no. 4980, pp.539-540, doi:10.1126/science.250.4980.539
- ^ Ellensburg Daily Record, "Galaxy Found", United Press International, 27 October 1990, p.16
- ^ Lodi News-Sentinel, "Giant Galaxy Discovered", UPI, 26 October 1990, pg.9
- ^ ”Multiwavelength Atlas of Galaxies - NGC 1399”. http://astronomy.swin.edu.au/~gmackie/atlas/index/n1399/n1399.html. Läst 18 juni 2011.
- ^ Rumistrzewicz, Stefan (2010). A Visual Astronomer's Photographic Guide to the Deep Sky: A Pocket Field Guide. New York, New York: Springer Science & Business Media. sid. 158. ISBN 9781441972422. http://books.google.com/?id=Vhjn3DEJpyIC&pg=PA158&dq=%22NGC+6085%22#v=onepage&q=%22NGC%206085%22&f=false
- ^ McConnell, Nicholas J.; Ma, Chung-Pei; Graham, James R.; Gebhardt, Karl; Lauer, Tod R.; Wright, Shelley A.; Richstone, Douglas O. (2011). ”The Black Hole Mass in the Brightest Cluster Galaxy NGC 6086”. The Astrophysical Journal 728 (2): sid. 100. doi:. http://iopscience.iop.org/0004-637X/728/2/100/article.
- ^ Nature 279, S.381-384: 0957 + 561 A, B: twin quasistellar objects or gravitational lens? D.Walsh, R.F.Carswell, R.J.Weymann 31 May 1979
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Hubble Illuminates Cluster of Diverse Galaxies (Abell S0740) - This image from NASA's Hubble Space Telescope shows the diverse collection of galaxies in the cluster Abell S0740 that is over 450 million light-years away in the direction of the constellation Centaurus.
The giant elliptical ESO 325-G004 looms large at the cluster's center. The galaxy is as massive as 100 billion of our suns. Hubble resolves thousands of globular star clusters orbiting ESO 325-G004. Globular clusters are compact groups of hundreds of thousands of stars that are gravitationally bound together. At the galaxy's distance they appear as pinpoints of light contained within the diffuse halo.
Other fuzzy elliptical galaxies dot the image. Some have evidence of a disk or ring structure that gives them a bow-tie shape. Several spiral galaxies are also present. The starlight in these galaxies is mainly contained in a disk and follows along spiral arms.
This image was created by combining Hubble science observations taken in January 2005 with Hubble Heritage observations taken a year later to form a 3-color composite. The filters that isolate blue, red and infrared light were used with the Advanced Camera for Surveys aboard Hubble.