期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 397, 期 4, 页码 1748-1755出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15106.x
关键词
galaxies: dwarf; galaxies: individual: Segue 2; Local Group
资金
- Alfred P. Sloan Foundation
- Participating Institutions
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Royal Society
- Science and Technology Funding Council of the United Kingdom
- NSF [AST-0206081, 0507453, 0808043, AST-0205790, 0505711, 0807498]
- STFC [ST/H004165/1, PP/E00105X/1, ST/H004157/1, ST/F001967/1, PP/C002229/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H004157/1, PP/C002229/1, ST/F001967/1, PP/E00105X/1, ST/H004165/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien [0808043, 0507453] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [807498] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [0505711] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0507453, 0808043] Funding Source: National Science Foundation
We announce the discovery of a new Milky Way satellite Segue 2 found in the data of the Sloan Extension for Galactic Understanding and Exploration (SEGUE). We followed this up with deeper imaging and spectroscopy on the Multiple Mirror Telescope (MMT). From this, we derive a luminosity of M-v = -2.5, a half-light radius of 34 pc and a systemic velocity of similar to -40 km s(-1). Our data also provide evidence for a stream around Segue 2 at a similar heliocentric velocity, and the SEGUE data show that it is also present in neighbouring fields. We resolve the velocity dispersion of Segue 2 as 3.4 km s(-1) and the possible stream as similar to 7 km s(-1). This object shows points of comparison with other recent discoveries, Segue 1, Boo II and Coma. We speculate that all four objects may be representatives of a population of satellites of satellites - survivors of accretion events that destroyed their larger but less dense parents. They are likely to have formed at redshifts z > 10 and are good candidates for fossils of the reionization epoch.
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