| | |
| | |
Stat |
Members: 3645 Articles: 2'501'711 Articles rated: 2609
20 April 2024 |
|
| | | |
|
Article overview
| |
|
Properties of Two New M31 dSph Companions from Keck Imaging | Eva K. Grebel
; Puragra Guhathakurta
; | Date: |
4 Dec 1998 | Subject: | astro-ph | Abstract: | We have obtained Keck Low Resolution Imaging Spectrograph images in V and I of the newly discovered Local Group dwarf galaxies Pegasus dSph and Cassiopeia dSph and their surrounding field. The first stellar luminosity functions and color-magnitude diagrams are presented for stars with V <~ 25 and I <~ 24. The distances to the new dwarfs are estimated from the apparent I mag of the tip of the red giant branch to be: D_MW (Peg dSph) = 830 +/- 80 kpc and D_MW (Cas dSph) = 760 +/- 70 kpc, consistent with their belonging to the extended M31 satellite system. Both galaxies are dwarf spheroidals (dSphs) with red giant branch morphologies indicating predominantly old stellar populations and estimated mean metallicities, <[Fe/H]>, of -1.3 +/- 0.3 for Peg dSph and -1.4 +/- 0.3 for Cas dSph. Their central surface brightness-<[Fe/H]>-absolute magnitude relationship follows that of other Local Group dSphs, dwarf ellipticals, and dwarf irregulars. In contrast to four out of nine Milky Way dSphs (the four that lie beyond D_MW =100 kpc), none of the six known M31 dSphs appears to have a dominant intermediate-age population. | Source: | arXiv, astro-ph/9812086 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |