Fai Login o Registrati per scaricare i media e creare liste
Suggerisci modifica o segnala un errore

Celestial Fireworks



*Description*: Resembling the puffs of smoke and sparks from a summer fireworks display in this image from NASA's Hubble Space Telescope, these delicate filaments are actually sheets of debris from a stellar explosion in a neighboring galaxy. Hubble's target was a supernova remnant within the Large Magellanic Cloud (LMC), a nearby, small companion galaxy to the Milky Way visible from the southern hemisphere. Denoted N 49, or DEM L 190, this remnant is from a massive star that died in a supernova blast whose light would have reached Earth thousands of years ago. This filamentary material will eventually be recycled into building new generations of stars in the LMC. Our own Sun and planets are constructed from similar debris of supernovae that exploded in the Milky Way billions of years ago. This seemingly gentle structure also harbors a very powerful spinning neutron star that may be the central remnant from the initial blast. It is quite common for the core of an exploded supernova star to become a spinning neutron star (also called a pulsar - because of the regular pulses of energy from the rotational spin) after the immediate shedding of the star's outer layers. In the case of N 49, not only is the neutron star spinning at a rate of once every 8 seconds, it also has a super-strong magnetic field a thousand trillion times stronger than Earth's magnetic field. This places this star into the exclusive class of objects called "magnetars." On March 5, 1979, this neutron star displayed a historic gamma-ray burst episode that was detected by numerous Earth-orbiting satellites. Gamma rays have a million or more times the energy of visible light photons. The Earth's atmosphere protects us by blocking gamma rays that originate from outer space. The neutron star in N 49 has had several subsequent gamma-ray emissions, and is now recognized as a "soft gamma-ray repeater." These objects are a peculiar class of stars producing gamma rays that are less energetic than those emitted by most gamma-ray bursters. The neutron star in N 49 is also emitting X-rays, whose energies are slightly less than that of soft gamma rays. High-resolution X-ray satellites have resolved a point source near the center of N 49, the likely X-ray counterpart of the soft gamma-ray repeater. Diffuse filaments and knots throughout the supernova remnant are also visible in X-ray. The filamentary features visible in the optical image represent the blast wave sweeping through the ambient interstellar medium and nearby dense molecular clouds. Today, N 49 is the target of investigations led by Hubble astronomers You-Hua Chu from the University of Illinois at Urbana-Champaign and Rosa Williams from the University of Massachusetts. Members of this science team are interested in understanding whether small cloudlets in the interstellar medium of the LMC may have a marked effect on the physical structure and evolution of this supernova remnant. The Hubble Heritage image of N 49 is a color representation of data taken in July 2000, with Hubble's Wide Field Planetary Camera 2. Color filters were used to sample light emitted by sulfur ([S II]), oxygen ([O III]), and hydrogen (H-alpha). The color image has been superimposed on a black-and-white image of stars in the same field also taken with Hubble. Technical facts about this news release: About the Object Object Name: LMC N 49, DEM L 190 Object Description: Supernova Remnant Position (J2000): R.A. 05h 25m 57s.3 Dec. -66° 05' 20" Constellation: Dorado Distance: The distance to the LMC is roughly 160,000 light-years (50 kpc). Dimensions: The image is roughly 1.9 arcminutes (91 light-years or 28 parsecs) across. About the Data Data Description: This image is a composite of archived Hubble observations from proposal 8114 by Y.-H. Chu (UIUC), R. Williams (UMASS), J. Dickel (UIUC), A. Caulet (ESO), R. Klinger (UIUC), E.Gotthelf (Columbia Astrophysics Lab); proposal 6827 by S. R. Kulkarni (Caltech), M. H. van Kerkwijk (U. of Toronto), R. Danner (JPL), T. Murakami (Kanazawa Univ. Japan); and proposal 6777 by R. Rothschild, D. Marsden, R. Cohen (UCSD). Instrument: WFPC2 Exposure Date(s): November 14, 1998, April 27, 1999, July 14, 2000 Exposure Time: 3.1 hours Filters: F502N ([O III]), F656N (Hα), F673N ([S II]), F814W ("I"), F547M (StrÔø_Ôø_Ôø_mgren "y") About the Image Image Credit: NASA and the Hubble Heritage Team (STScI/AURA) Release Date: July 3, 2003 Orientation: Celestial Fireworks: Sheets of Debris From a Stellar Explosion (N 49, DEM L 190) [ http://imgsrc.hubblesite.org/hu/db/2003/20/images/a/formats/compass_large_web.jpg ] What is Hubble Heritage? A monthly showcase of new and archival Hubble images. Go to the Heritage site. Back to top [ #top ] *News Release Number:*: STScI-2003-20a


LICENZA : Pubblico dominio
ARGOMENTI : # in Matematica e scienze / Astronomia
TAG : tag: LMC N 49 , DEM L 190 , Hubble Space Telescope (HST) , Visible Light , Earth , Sun , Wide Field Planetary Camera 2 , Camera 2 , Constellation , Dorado , ESO , Columbia , Large Magellanic Cloud , Illinois , Massachusetts , Toronto
FONTE : Hubble Space Telescope Collection