The disk and halo densities at the plane from star-counts in the Galactic poles

Details The disk and halo densities at the plane from star-counts in the Galactic poles The disk and halo densities at the plane from star-counts in the Galactic poles

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..610s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, March 1987, p. 610-615.

Astronomy and Astrophysics

Astronomy

58

Density Distribution, Disk Galaxies, Dwarf Stars, Milky Way Galaxy, Disks, Galactic Mass, Halos, Radial Velocity, Stellar Mass

Scientific paper

Four determinations of the density distribution D(Z) with height from the plane at the solar circle for dwarfs with absolute magnitudes of (MV) ≅ +4 to +5 are combined. The four determinations are in good agreement. The data extend to Z = 10 kpc. The gradient, dlog D(Z)/dZ, changes continuously over the observed range of Z; the gradient flattens with increasing Z. Calculated density distributions for discrete kinematic samples with σ(W) values of 17, 42, and 90 km s-1 provide a unique fit to the data, giving density normalizations at Z = 0 of 1:0.11:0.005. The authors identify the σ(W) = 17 km s-1 component with the old thin disk (scale height ≡270 pc), the σ(W) = 42 km s-1 component with the thick disk (scale height ≡940 pc), and the σ(W) = 90 km s-1 component with the extreme halo (scale height at ≡3.2 kpc). The mass of the stellar component in the halo is estimated to be ≡3×109M_sun;, comprising less than ≡2% of the total galactic mass. From two normalizations the local density of halo stars is between 1×105M_sun; kpc-3 and 2.5×105M_sun; kpc-3, agreeing well with previous values by Schmidt and by Eggen from widely different methods.

Affiliated with

Also associated with

No associations

Rating

The disk and halo densities at the plane from star-counts in the Galactic poles 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 disk and halo densities at the plane from star-counts in the Galactic poles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The disk and halo densities at the plane from star-counts in the Galactic poles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1452337