HUBBLE SPACE TELESCOPE View of the Heart of Ursa Minor

Details HUBBLE SPACE TELESCOPE View of the Heart of Ursa Minor HUBBLE SPACE TELESCOPE View of the Heart of Ursa Minor

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....117.1764b&link_type=abstract

The Astronomical Journal, Volume 117, Issue 4, pp. 1764-1770.

Astronomy and Astrophysics

Astronomy

6

Galaxies: Individual (Ursa Minor), Galaxies: Structure

Scientific paper

Hubble Space Telescope F606W observations to 26th magnitude are used to investigate the stellar distribution in the center of the Ursa Minor dwarf spheroidal galaxy. The central surface density is found to be low, less than 700 stars arcmin^-2, with no sign of a pronounced cusp. The maximum of the surface density is not found at our adopted center but in a ringlike structure some 13" from it. We identify this feature with the subclustering identified by Olszewski & Aaronson, who believed that it was off-center. The currently accepted King's structural parameters, r_c and r_t, of Ursa Minor are found to be unsuitable to represent the stellar surface density near the center. Our star counts are used to obtain a lower limit of the central stellar density without the use of the velocity dispersion. We find a lower limit of 1.7+/-1.1 M_solar pc^-3 from stars that were counted. By extrapolating the mass function to lower masses, we estimate that the true density could increase be a factor of 7.

Affiliated with

Also associated with

No associations

Rating

HUBBLE SPACE TELESCOPE View of the Heart of Ursa Minor 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 HUBBLE SPACE TELESCOPE View of the Heart of Ursa Minor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HUBBLE SPACE TELESCOPE View of the Heart of Ursa Minor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1429498