Starcounts Constraints on the Density Laws of the Galaxy

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

As a part of the Selected Areas Starcounts Survey (SASSY), we present an analysis of the density laws of the Galactic populations. Using broadband RI photometry, which is relatively insensitive to the effects of differential metallicity and reddenning, combined with a revision of the M(R) to R-I relation calibrated from HIPPARCOS data, we have derived photometric parallaxes for a sample of 46,000 stars in 9.7 square degrees in the Selected Areas 107 (l,b=6,41), 184 (l,b=356,-40), 90 (l,b=77,-33) and 141 (l,b=245,-86). The data are 100 to an average magnitude of I=19.8 and R=20.6 across all fields. We discuss the methods used for photometry and object classification. We also demonstrate how Malmquist bias, binary stars and poor star/galaxy separation can affect the density laws derived in starcount analyses. Our exponential scaleheights and density normalizations for the CCD data in SA141 agree well with the previous photographic work in this field by Gilmore & Reid (1983), as well as the previously reported parameters of the ``interim starcount model'' in Reid & Majewski (1993). However, global solutions to all four fields found unsatisfactory fits to the radial dependences of the densities when exponential functional forms were used, which suggests that more complex density laws may be required.

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

Starcounts Constraints on the Density Laws of the Galaxy 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 Starcounts Constraints on the Density Laws of the Galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Starcounts Constraints on the Density Laws of the Galaxy will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1184368

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