Structure of the Draco Dwarf Spheroidal Galaxy

Abstract

This article studies the structure of the Draco dwarf spheroidal galaxy with an emphasis on the question of whether the spatial distribution of its stars has been affected by the tidal interaction with the Milky Way, using R- and V-band CCD photometry for eleven fields. The article reports coordinates for the center, a position angle of the major axis, and the ellipticity. It also reports the results of searches for asymmetries in the structure of Draco. These results, and searches for a ``break'' in the radial profile and for the presence of principal sequences of Draco in a color-magnitude diagram for regions more than 50 arcmin from the center, yield no evidence that tidal forces from the Milky Way have affected the structure of Draco.

25 pages, 11 figures, 3 tables. Accepted for publication in AJ

References in corpus (6)

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Cited by in corpus (18)

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• Stellar Populations of Dwarf Elliptical Galaxies: UBVRI Photometry of Dwarf Elliptical Galaxies in the Virgo Cluster
• The Carina Project: II. Stellar Populations
• VERITAS Search for VHE Gamma-ray Emission from Dwarf Spheroidal Galaxies
• Exploring Halo Substructure with Giant Stars VIII: The Extended Structure of the Sculptor Dwarf Spheroidal Galaxy
• Scaling Laws for Dark Matter Halos in Late-Type and Dwarf Spheroidal Galaxies
• Draco -- A Failure of the Tidal Model
• Dark Matter signals from Draco and Willman 1: Prospects for MAGIC II and CTA
• Draco, a flawless dwarf galaxy
• A Search for Dark Matter Annihilation with the Whipple 10m Telescope
• Proper Motion of the Leo II Dwarf Galaxy Based On Hubble Space Telescope Imaging
• Proper Motion of the Draco Dwarf Galaxy Based On Hubble Space Telescope Imaging
• The Draco dwarf galaxy in the near-infrared
• Proper Motion of the Draco Dwarf Galaxy from Subaru Suprime-Cam Data
• Accurate mass estimates from the proper motions of dispersion-supported galaxies
• The tidal features of the classical Milky Way satellites: Expected in MOND but inconsistent with cold dark matter models