The Cygnus X region. XI - Map of visual extinction A sub V

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

36

Astronomical Maps, Interstellar Extinction, Photoabsorption, Radio Sources (Astronomy), Visual Observation, Brightness Temperature, Emission Spectra, Galactic Evolution, H Alpha Line, H Ii Regions, Hydrogen Ions, Interstellar Gas, Nebulae, Optical Emission Spectroscopy, Radio Astronomy

Scientific paper

A detailed absolute calibration of H-alpha data and results of a 2695-MHz radio-continuum survey are used to construct contour maps of the visual extinction (AV), H-alpha surface brightness, and radio brightness temperature throughout most of the Cygnus X complex. The distribution of interstellar extinction is obtained directly from a comparison of the optical and radio emission from the ionized hydrogen in the complex. Errors which affect the visual-extinction map are evaluated, the rather low radio-telescope resolution of 11 arcmin is shown to lie in the optimum range for the purposes intended, and the unresolved thermal background of the radio map is attributed to two large H II complexes. The variation of the mapped extinction is described, and attention is given to observed characteristics of optically bright nebulae, the Cygnus OB2 association, several compact H II regions, a supernova remnant, the NGC 6888 area, and the optical nebulosities IC 1318 b and c. Two additional regions of extended and rather high extinction are also identified. The results are taken as strengthening the previous hypothesis that the objects in Cygnus X are distributed along the line of sight rather than being clumped at one distance.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

The Cygnus X region. XI - Map of visual extinction A sub V does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Cygnus X region. XI - Map of visual extinction A sub V, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Cygnus X region. XI - Map of visual extinction A sub V will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1295496

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.