Tarantelnebulosan

Tarantelnebulosan
Tarantelnebulosan fotograferad av Hubbleteleskopet.
Observationsdata
TypH II-region[1]
StjärnbildSvärdfisken[2]
Rektascension05t 38m 42.3s[1]
Deklination-69° 06′ 03″[1]
NoterbartBelägen i stora magellanska molnet[1]
Andra beteckningar
Caldwell 103[3], NGC 2070, 30 Dor, ESO 057-EN 006[1]
Se även: Nebulosor, Lista över nebulosor

Tarantelnebulosan[2], även NGC 2070 är en H II-region i Stora magellanska molnet.[1]

Ett foto taget med Hubbleteleskopet som visar det stjärnbildande området vid Tarantelnebulosan.

Om den vore lika nära jorden som Orionnebulosan skulle den lysa så starkt att den kastade skuggor.[4]

Stjärnhopar

I nebulosans centrum finns den täta stjärnhopen R136, med lysande superjättestjärnor (diameter 35 ljusår).[5] Där upptäckte astronomer 2010 den hittills tyngsta kända stjärnan, R136a1, med en massa på 265 solmassor.

Förutom R136 finns det i Tarantelnebulosan också en äldre stjärnhop, Hodge 301, med en ålder på 20–25 miljoner år. Den tyngsta stjärnan i denna stjärnhop har redan exploderat som supernova.[6]

Den närmaste supernova som observerats sedan astronomerna fått tillgång till teleskop, supernova 1987A, skedde i utkanten av Tarantelnebulosan.[7]

Referenser

  1. ^ [a b c d e f] NGC 2070 på NASA/IPA Extragalactic Database
  2. ^ [a b] En dramatisk stjärnvagga i porträtt, ESO, 21 december 2006
  3. ^ Caldwellkatalogen på SEDS
  4. ^ ”Neighbor galaxy caught stealing stars”. National Optical Astronomy Observatory. http://www.noao.edu/news/2011/pr1102.php. Läst 7 augusti 2013. 
  5. ^ Massey & Hunter (1998). ”Star Formation in R136: A Cluster of O3 Stars Revealed by Hubble Space Telescope Spectroscopy”. The Astrophysical Journal 493 (1): sid. 180. 
  6. ^ Grebel & Chu (2000). ”Hubble Space Telescope Photometry of Hodge 301: An "Old" Star Cluster in 30 Doradus”. The Astrophysical Journal 119 (2): sid. 787-799. 
  7. ^ Couper, Heather; Henbest & Nigel. Encyclopedia of Space 

Externa länkar

Media som används på denna webbplats

Tarantula Nebula - Hubble.jpg
Central portion of the Tarantula Nebula. "This mosaic of the Tarantula Nebula consists of images from the NASA/ESA Hubble Space Telescope’s Wide Field and Planetary Camera 2 (WFPC2) and was created by 23 year old amateur astronomer Danny LaCrue. ... Additional image processing was done by the Hubble European Space Agency Information Centre."
A New View of the Tarantula Nebula.jpg
To celebrate its 22nd anniversary in orbit, the Hubble Space Telescope released a dramatic new image of the star-forming region 30 Doradus, also known as the Tarantula Nebula because its glowing filaments resemble spider legs. A new image from all three of NASA's Great Observatories--Chandra, Hubble, and Spitzer--has also been created to mark the event.

The nebula is located in the neighboring galaxy called the Large Magellanic Cloud, and is one of the largest star-forming regions located close to the Milky Way. At the center of 30 Doradus, thousands of massive stars are blowing off material and producing intense radiation along with powerful winds. The Chandra X-ray Observatory detects gas that has been heated to millions of degrees by these stellar winds and also by supernova explosions. These X-rays, colored blue in this composite image, come from shock fronts--similar to sonic booms--formed by this high-energy stellar activity.

The Hubble data in the composite image, colored green, reveals the light from these massive stars along with different stages of star birth, including embryonic stars a few thousand years old still wrapped in cocoons of dark gas. Infrared emission data from Spitzer, seen in red, shows cooler gas and dust that have giant bubbles carved into them. These bubbles are sculpted by the same searing radiation and strong winds that comes from the massive stars at the center of 30 Doradus.