File:Pelican Nebula Ionization Front (noao0314a).jpg
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[edit]DescriptionPelican Nebula Ionization Front (noao0314a).jpg |
English: This image of the clouds of gas and dust next to the “neck” and “body” of the Pelican Nebula was taken by the National Science Foundation’s Mayall 4-meter telescope at Kitt Peak National Observatory near Tucson, AZ. Narrow-band filters were used to isolate the red emission lines of hydrogen and singly-ionized sulfur. The image reveals many previously unseen shockwaves, evidence for powerful outflows from newly formed stars embedded within the molecular clouds that rim the nebula. North is up and west is to the right in this image. This image was produced by an NOAO Survey Program known as the Deep Imaging Survey of Nearby Star-Forming Clouds, which is led by John Bally of the University of Colorado and Bo Reipurth of the University of Hawaii. It is also the subject of a related press release.Note: the large “donut” in the middle is an artifact of the coma corrector in the KPNO 4-meter that was not completely removed in the reduction. This image has been clipped to remove ragged edges caused by the dither pattern of the different fields. An un-clipped version, with higher resolution, is also available. |
Date | 6 October 2003 (upload date) |
Source | Pelican Nebula Ionization Front |
Author | University of Colorado, University of Hawaii and NOIRLab/NSF/AURA |
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[edit]This media was created by the National Optical-Infrared Astronomy Research Laboratory (NOIRLab).
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Credit/Provider | University of Colorado, University of Hawaii and NOIRLab/NSF/AURA |
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Source | NSF's NOIRLab |
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Date and time of data generation | 00:00, 6 October 2003 |
JPEG file comment | Credits: John Bally (University of Colorado) Bo Reipurth (University of Hawaii) These images, obtained with the MOSAIC CCD camera at the prime focus of the Mayall 4 meter reflector, show a 36' field of view that contains the well known Pelican nebula located at the northwest rim of the giant HII region W80 (the North America/Pelican Nebula) in Cygnus. These narrow-band images, obtained in the light of recombining hydrogen atoms and singly ionized sulfur reveal a population of hitherto unrecognized shocks which trace outflows from forming stars embedded within the molecular clouds that rim the nebula. The visibility of these protostellar outflows is enhanced by the ultraviolet radiation field of several massive stars located off the image. This radiation is eroding the surrounding molecular cloud. In regions shadowed by dense clumps of gas and dust, parts of the dense and cold molecular cloud survive to produce the long "pillars" of dusty material. A faint jet (known as Herbig-Haro object 555) squirts out of the tip of one of the pillars, apparently indicating the presence of an unseen protostar. |
Keywords | Pelican Nebula |
Contact information |
950 North Cherry Ave. Tucson, AZ, 85719 USA |
IIM version | 4 |