Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.3002m&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #30.02; Bulletin of the American Astronomical Society, Vol. 26, p.905
Astronomy and Astrophysics
Astronomy
Scientific paper
\ \ Imaging observations of faint Galactic Hα emission from the warm ionized medium have been carried out with a dual-etalon, 150mm-diameter, Fabry-Perot spectrometer and a CCD camera. The FWHM velocity resolution is 12kms(-1) (0.25 Angstroms ) and the field of view is normally 0.(deg) 8 but can be increased to about 2.(deg) 0 The spatial resolution of the images is 1--2'. \ \ A high velocity (v_LSR -50kms(-1) ) feature was discovered near l=96(deg) , b=0(deg) . The feature was identified as an HII region listed as BSF8 by Fich (Ap.J.S., 86, 475 (1993)), who carried out observations in the radio continuum. It was first cited by Blitz, Fich and Stark in Ap.J.S., 49, 183 (1982). \ \ An Hα data cube of BSF8 shows that it has a diameter of about 12', with an average surface brightness of =~ 13Rayleighs and a peak surface brightness of =~ 32Rayleighs. The spatially integrated emission has a velocity FWHM of =~ 32kms(-1) . The signal to noise ratio (SNR) for one pixel near the peak of the line is =~ 13. The high SNR is achieved due to the narrow passband of the Fabry-Perot which reduces the contribution from the diffuse background. \ \ The 2.(deg) 0 field of view, relatively good spatial resolution, and high spectral resolution would be useful for conducting searches for faint HII regions near the galactic plane, where the relatively bright, diffuse background (Hα and continuum) normally would obscure such objects in searches at lower spectral and spatial resolution.
Milster Scott Patterson
Scherb Frank
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