Other
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2013c&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #20.13; Bulletin of the American Astronomical Society, Vol. 27, p.836
Other
Scientific paper
During the recent Astro-2 mission the Ultraviolet Imaging Telescope (UIT) obtained far-UV (FUV: 1200-1800 Angstroms) images of 14 positions on supernova remnants (SNRs). UIT has produced the only images of SNRs in this bandpass; the images have wide fields (40 arcmin diameter), high spatial resolution ( ~ 3 arcsec) and high sensitivity (typically 1\dexp{-18} \flx, averaged over the 225-400 Angstroms bandpasses). The fields are centered on positions of particular interest on Galactic SNRs, having extensive X-ray, IUE and groundbased observations and theoretical work. Field centers include several Cygnus Loop positions: nearly complete coverage of the eastern edge; a non-radiative shock on the northeast shell; Miller's Position 1; and Miller's Position 3 on the western edge. In addition, two Vela SNR positions, a Puppis A position, and the SN1006 remnant were imaged. Most images were made in the UIT ``B5'' bandpass, which is sensitive from about 1450 Angstroms to 1800 Angstroms; some positions were also imaged in the ``B1'' filter which extends shortward to 1300 Angstroms. The UIT bandpasses encompass several potentially strong emission features, depending on conditions: the hydrogen two-photon continuum, and CII 1335 Angstroms, OV 1371 Angstroms, (OIV],SIV], SiIV)1409 Angstroms, NIV 1485 Angstroms, CIV 1549 Angstroms, HeII 1640 Angstroms, OIII] 1666 Angstroms, NIII] 1745 Angstroms, SiIII] 1892 Angstroms and CIII] 1909 Angstroms emission lines may all contribute. However, because of high shock velocities, the UIT Astro-1 B5 image of an eastern Cygnus Loop field was dominated by the CIV 1549 Angstroms resonance line, and offered a clear contrast with [OIII] 5007 Angstroms, which has similar excitation characteristics but is seen only in small optical depths. UIT images of observed SNR fields will be presented and discussed. Shock models, images made in other bandpasses, and ultraviolet spectra for positions within the UIT fields will be used to interpret emission seen in the images.
Cornett Robert H.
Stecher Theodore P.
UIT Team
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