期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 804, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/804/2/L44
关键词
galaxies: dwarf; galaxies: individual (Pegasus III); galaxies: stellar content; Galaxy: halo; Local Group
资金
- Australian Research Council [DP150100862]
- Discovery Early Career Researcher Award [DE150101816]
- Go8/Germany Joint Research Co-operation Scheme
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy Office of Science
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- U.S. Department of Energy
- Ministry of Education and Science (Spain)
- Science and Technology Facilities Council (UK)
- Higher Education Funding Council (England)
- National Center for Supercomputing Applications
- Kavli Institute for Cosmological Physics
- Financiadora de Estudos e Projetos
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Ministrio da Ciencia e Tecnologia (Brazil)
- German Research Foundation - cluster of excellence Origin and Structure of the universe
- DES collaborating institutions
We report the discovery of an ultra-faint Milky Way satellite galaxy in the constellation of Pegasus. The concentration of stars was detected by applying our overdensity detection algorithm to the SDSS-DR 10 and confirmed with deeper photometry from the Dark Energy Camera at the 4m Blanco telescope. Fitting model isochrones indicates that this object, Pegasus III, features an old and metal-poor stellar population ([Fe/H] similar to-2.1) at a heliocentric distance of 205 +/- 20 kpc. The new stellar system has an estimated half-light radius of r(h) = 78(-24)(+30)pc and a total luminosity of M-V similar to -4.1 +/- 0.5 that places it into the domain of dwarf galaxies on the size-luminosity plane. Pegasus III is spatially close to the MW satellite Pisces II. It is possible that the two might be physically associated, similar to the Leo IV and Leo V pair. Pegasus III is also well aligned with the Vast Polar Structure, which suggests a possible physical association.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据