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A Galaxy That's All Wound Up



*Description*: Tightly wound, almost concentric, arms of dark dust encircle the bright nucleus of galaxy NGC 2787 in this NASA Hubble Space Telescope image created by the Hubble Heritage Team. In astronomer Edwin Hubble's galaxy classification scheme, NGC 2787 is classified as an SB0, a barred lenticular galaxy. These lens-shaped galaxies show little or no evidence of the grand spiral arms that occur in their more photogenic cousins, though NGC 2787 does sport a faint bar, not apparent in this image. NGC 2787's seemingly bland qualities are, however, just what the doctor ordered for astronomer Marcella Carollo's investigation. Dr. Carollo (Swiss Federal Institute of Technology, Zurich) and team used Hubble to look at the center of these galaxies for clues about the process of galaxy formation including the role of galaxy collisions and central black holes. Also visible in the Heritage image are about a dozen globular clusters hovering around NGC 2787. What appear to be stars are, in fact, gravitationally bound families of 100,000's of ancient stars orbiting the center of NGC 2787. NGC 2787 lies roughly 24 million light-years (7.4 megaparsecs) from Earth in the constellation Ursa Major. Data was collected with the Wide Field Planetary Camera 2 in January 1999. This Heritage image was made by combining light from blue, green and infrared filters from the 1999 dataset. Technical facts about this news release: About the Object Object Name: NGC 2787 Object Description: Galaxy with Spiral Arm Structure Position (J2000): R.A. 09h 19m 18.90s Dec. +69° 12' 11.9" Constellation: Ursa Major Distance: About 24 million light-years (7.4 megaparsecs) Dimensions: The image is roughly 38 arcseconds (4400 light-years or 1300 parsecs) across. About the Data Instrument: WFPC2 Exposure Date(s): January 29, 1999 Exposure Time: 1.2 hours Principal Astronomers: M. Carollo (Swiss Federal Institute of Technology, Zurich) About the Image Image Credit: NASA and The Hubble Heritage Team (STScI/AURA) Release Date: October 18, 2002 Filters: F450W (Wide B), F555W (V), F814W (I) Orientation: Tightly Wound Arms of Dust Encircle Nucleus of Galaxy NGC 2787 [ http://imgsrc.hubblesite.org/hu/db/2002/07/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-2002-07a


LICENZA : Pubblico dominio
ARGOMENTI : # in Matematica e scienze / Astronomia
TAG : tag: NGC 2787 , Hubble Space Telescope (HST) , Earth , Constellation , Ursa Major , Wide Field Planetary Camera 2 , Camera 2
FONTE : Hubble Space Telescope Collection