Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99..129f&link_type=abstract
Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.129
Astronomy and Astrophysics
Astronomy
Scientific paper
The spiral design of the Milky Way's second quadrant (90°= l =180°, -3°=b =+7°) is determined from new distances to 70 H ii regionsand 20 Supernova Remnants (SNRs), and to the H i peaks typically associated with the spiral arms. The H i modelling method of Foster (2005) is used. This is an alternative method to kinematic and spectrophotometric distance determinations, from which the longstanding disagreement between the distances to the H i arms and H ii regions descends. Results of these classical distance methods are shown to exceed upper-limit distances to many objects. Most importantly, the discrepancy between the H i and H ii Perseus arm is resolved with the new method. The Perseus spiral arm is found to be very well defined by the majority of optically brilliant H ii regions, and similar spiral structure is followed by the density peaks of neutral hydrogen. A logarithmic spiral design with pitch angle of 10 degrees best describes the Perseus H i arm. An important new observation is that SNRs are found to cluster together with groups of star formation regions.
No associations
LandOfFree
The Spiral Structure of the Galaxy's Second Quadrant in H i and H ii 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 Spiral Structure of the Galaxy's Second Quadrant in H i and H ii, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Spiral Structure of the Galaxy's Second Quadrant in H i and H ii will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-856344