| | |
| | |
Stat |
Members: 3645 Articles: 2'504'928 Articles rated: 2609
26 April 2024 |
|
| | | |
|
Article overview
| |
|
Kinematic sub-populations in dwarf spheroidal galaxies | Ugur Ural
; Mark I. Wilkinson
; Andreas Koch
; Gerard Gilmore
; Timothy C. Beers
; Vasily Belokurov
; N. Wyn Evans
; Eva K. Grebel
; Simon Vidrih
; Daniel B. Zucker
; | Date: |
1 Aug 2008 | Abstract: | We present new spectroscopic data for twenty six stars in the
recently-discovered Canes Venatici I (CVnI) dwarf spheroidal galaxy. We use
these data to investigate the recent claim of the presence of two dynamically
inconsistent stellar populations in this system (Ibata et al., 2006). We do not
find evidence for kinematically distinct populations in our sample and we are
able to obtain a mass estimate for CVnI that is consistent with all available
data, including previously published data. We discuss possible differences
between our sample and the earlier data set and study the general detectability
of sub-populations in small kinematic samples. We conclude that in the absence
of supporting observational evidence (for example, metallicity gradients),
sub-populations in small kinematic samples (typically fewer than 100 stars)
should be treated with extreme caution, as their detection depends on multiple
parameters and rarely produces a signal at the 3sigma confidence level. It is
therefore essential to determine explicitly the statistical significance of any
suggested sub-population. | Source: | arXiv, 0808.0141 | 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:
| |