Volume limited dependent Galactic model parameters

Details Volume limited dependent Galactic model parameters Volume limited dependent Galactic model parameters

2007-11-15

arxiv.org/abs/0711.2355v1

Astronomy and Astrophysics

Astrophysics

12 pages, including 8 figures and 5 tables, accepted for publication in PASA

Scientific paper

10.1071/AS07006

We estimated 34 sets of Galactic model parameters for three intermediate latitude fields with Galactic longitudes l=60, l=90, and l=180, and we discussed their dependence on the volume. Also, we confirmed the variation of these parameters with absolute magnitude and Galactic longitude. The star samples in two fields are restricted with bright and unit absolute magnitude intervals, (4,5], and (5,6], whereas for the third field a larger absolute magnitude interval is adopted, (4,10]. The limiting apparent magnitudes of star samples are g=15 and g=22.5 mag which provide space densities within distances in the line of sight 0.9 and 25 kpc. The Galactic model parameters for the thin disc are not volume dependent. However, the ones for thick disc and halo do show spectacular trends in their variations with volume, except for the scalelength of the thick disc. The local space density of the thick disc increases, whereas the scaleheight of the same Galactic component decreases monotonically. However, both model parameters approach asymptotic values at large distances. The axial ratio of the halo increases abruptly for the volumes where thick disc is dominant, whereas it approaches an asymptotic value gradually for larger volumes, indicating a continuous transition from disclike structure to a spherical one at the outermost region of the Galaxy. The variation of the Galactic model parameters with absolute magnitude can be explained by their dependence on the stellar luminosity, whereas the variation with volume and Galactic longitude at short distances is a bias in analysis.

Affiliated with

Also associated with

No associations

Rating

Volume limited dependent Galactic model parameters 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 Volume limited dependent Galactic model parameters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Volume limited dependent Galactic model parameters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-214815