Starcounts in the Hubble Deep Field: Constraining Galactic Structure Models

Details Starcounts in the Hubble Deep Field: Constraining Galactic Structure Models Starcounts in the Hubble Deep Field: Constraining Galactic Structure Models

1996-07-23

arxiv.org/abs/astro-ph/9607112v2

Astronomy and Astrophysics

Astrophysics

Tex type, 7 pages, 3 postscript figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society. A few

Scientific paper

Stellar sources are identified in the Hubble Deep Field, and accurate colours and magnitudes are presented. The predictions of a Galactic starcounts model are compared with the faint stellar counts in this field. The model reproduces the observations very well in the magnitude range 21.0 < V < 26.4, while it overpredicts the counts by a factor of four in the range 26.4 < V < 30.0. The luminosity function for halo objects must be a factor of two smaller than that predicted by an extrapolation of the solar-neighborhood luminosity function for disc stars (with 95% confidence level). This result, seen before in deep Hubble Space Telescope images of globular clusters, is therefore confirmed for the halo field population. The possible nature of a group of faint-blue objects is also investigated, concluding that they are most likely non-stellar. The possibility that they are QSOs is ruled out. If we insist upon their stellar nature, they would be halo white dwarfs, with either a very steep halo white dwarf luminosity function for Mv > +11.0, or a stellar density 0.4 times that of the disc white dwarfs in the solar-neighborhood.

Affiliated with

Also associated with

No associations

Rating

Starcounts in the Hubble Deep Field: Constraining Galactic Structure Models 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 in the Hubble Deep Field: Constraining Galactic Structure Models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Starcounts in the Hubble Deep Field: Constraining Galactic Structure Models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-211402