期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 705, 期 2, 页码 L158-L162出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/705/2/L158
关键词
galaxies: dwarf; Galaxy: halo; Galaxy: structure; stars: individual (RR Lyrae)
资金
- NSF [AST-0757888, AST-0507325]
- National Science Foundation [PHY05-51164]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0757888] Funding Source: National Science Foundation
We present spectroscopic confirmation of the Pisces Overdensity, also known as Structure J, a photometric overdensity of RR Lyrae stars discovered by the Sloan Digital Sky Survey at an estimated photometric distance of similar to 85 kpc. We measure radial velocities for eight RR Lyrae stars within Pisces. We find that five of the eight stars have heliocentric radial velocities within a narrow range of -87 km s(-1) < v(r) < -67 km s(-1), suggesting that the photometric overdensity is mainly due to a physically associated system, probably a dwarf galaxy or a disrupted galaxy. Two of the remaining three stars differ from one another by only 9 km s(-1), but it would be premature to identify them as a second system.
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