Detailed Studies of the Sculptor Dwarf Spheroidal Galaxy in the Milky Way halo
نویسندگان
چکیده
منابع مشابه
Associated with the Sculptor Dwarf Spheroidal Galaxy
Neutral hydrogen (H I ) has been detected in the Local Group dwarf spheroidal galaxy Sculptor with the 64 m Parkes single dish and mapped with the Australia Telescope synthesis array. Most of the detected H I is in two clouds ∼ 15 − 20 away from the optical center. The gas is observed at the same systemic velocity than the stars but at ≥ 125 km s away from the Magellanic Stream components in th...
متن کاملThe discovery of X-ray binaries in the Sculptor Dwarf Spheroidal Galaxy
We report the results of a deep Chandra survey of the Sculptor dwarf spheroidal galaxy. We find five X-ray sources with LX of at least 6 × 10 ergs/sec with optical counterparts establishing them as members of Sculptor. These X-ray luminosities indicate that these sources are X-ray binaries, as no other known class of Galactic point sources can reach 0.5-8 keV luminosities this high. Finding the...
متن کاملThe Internal Kinematics of the Leo I Dwarf Spheroidal Galaxy: Dark Matter at the Fringe of the Milky Way
We present radial velocities of 33 red giants in the Leo I dSph galaxy obtained from spectra taken with the HIRES echelle spectrograph on the Keck I telescope. These data have a mean precision of 2.2 km s and lead to estimates of the central velocity dispersion and systemic velocity of Leo I of 8.8 ± 1.3 km s, and 287.0± 1.9 km s, respectively. The systemic velocity confirms past results that L...
متن کاملA Neighboring Dwarf Irregular Galaxy Hidden by the Milky Way
We have obtained VLA and optical follow-up observations of the low-velocity H I source HIZSS 3 discovered by Henning et al. 2000 and Rivers 2000 in a survey for nearby galaxies hidden by the disk of the Milky Way. Its radio characteristics are consistent with this being a nearby (∼ 1.8 Mpc) low-mass dwarf irregular galaxy (dIm). Our optical imaging failed to reveal a resolved stellar population...
متن کاملAn Internal Second Parameter Problem in the Sculptor Dwarf Spheroidal Galaxy
We present BV photometry of the Sculptor dwarf galaxy to V = 22. These data give evidence for a bimodality in Sculptor’s metallicity distribution based on a discontinuity in the luminosities of horizontal branch (HB) stars and by the presence of two distinct red giant branch (RGB) bumps. A consistent picture of the evolved stars in Sculptor is given by the presence of (1) a metal-poor populatio...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2013
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921313006194