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Mapping the Tidal Destruction of the Hercules Dwarf: A Wide-field DECam Imaging Search for RR Lyrae Stars
Garling, Christopher1,2; Willman, Beth3,4; Sand, David J.3; Hargis, Jonathan5; Crnojevic, Denija6; Bechtol, Keith4; Carlin, Jeffrey L.4; Strader, Jay7; Zou, Hu8; Zhou, Xu8; Nie, Jundan8; Zhang, Tianmeng8; Zhou, Zhimin8; Peng, Xiyan8
2018
Source PublicationASTROPHYSICAL JOURNAL
Volume852Issue:1
AbstractWe investigate the hypothesized tidal disruption of the Hercules ultra-faint dwarf galaxy (UFD). Previous tidal disruption studies of the Hercules UFD have been hindered by the high degree of foreground contamination in the direction of the dwarf. We bypass this issue by using RR Lyrae stars, which are standard candles with a very low field-volume density at the distance of Hercules. We use wide-field imaging from the Dark Energy Camera on CTIO to identify candidate RR Lyrae stars, supplemented with observations taken in coordination with the Beijing-Arizona Sky Survey on the Bok Telescope. Combining color, magnitude, and light-curve information, we identify three new RR Lyrae stars associated with Hercules. All three of these new RR Lyrae stars lie outside its published tidal radius. When considered with the nine RR Lyrae stars already known within the tidal radius, these results suggest that a substantial fraction of Hercules' stellar content has been stripped. With this degree of tidal disruption, Hercules is an interesting case between a visibly disrupted dwarf (such as the Sagittarius dwarf spheroidal galaxy) and one in dynamic equilibrium. The degree of disruption also shows that we must be more careful with the ways we determine object membership when estimating dwarf masses in the future. One of the three discovered RR Lyrae stars sits along the minor axis of Hercules, but over two tidal radii away. This type of debris is consistent with recent models that suggest Hercules' orbit is aligned with its minor axis.
SubtypeArticle
KeywordGalaxies: Dwarf Galaxies: Individual (Hercules) Local Group Stars: Variables: Rr Lyrae
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences(XDB09000000 ; Chinese Academy of Sciences(XDB09000000 ; Ministry of Finance ; Ministry of Finance ; Chinese National Natural Science Foundation(11433005) ; Chinese National Natural Science Foundation(11433005) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF(AST-1412504 ; NSF(AST-1412504 ; Packard Fellowship ; Packard Fellowship ; 114A11KYSB20160057) ; 114A11KYSB20160057) ; AST-1514763) ; AST-1514763) ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences(XDB09000000 ; Chinese Academy of Sciences(XDB09000000 ; Ministry of Finance ; Ministry of Finance ; Chinese National Natural Science Foundation(11433005) ; Chinese National Natural Science Foundation(11433005) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF(AST-1412504 ; NSF(AST-1412504 ; Packard Fellowship ; Packard Fellowship ; 114A11KYSB20160057) ; 114A11KYSB20160057) ; AST-1514763) ; AST-1514763)
DOI10.3847/1538-4357/aa9bf1
WOS KeywordDARK-MATTER ANNIHILATION ; MILKY-WAY SATELLITE ; SPHEROIDAL GALAXY ; GALACTIC SATELLITES ; VARIABLE-STARS ; COMA BERENICES ; SKY SURVEY ; LOW-MASS ; LEO V ; PHOTOMETRY
Indexed BySCI
Language英语
Funding OrganizationNational Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences(XDB09000000 ; Chinese Academy of Sciences(XDB09000000 ; Ministry of Finance ; Ministry of Finance ; Chinese National Natural Science Foundation(11433005) ; Chinese National Natural Science Foundation(11433005) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF(AST-1412504 ; NSF(AST-1412504 ; Packard Fellowship ; Packard Fellowship ; 114A11KYSB20160057) ; 114A11KYSB20160057) ; AST-1514763) ; AST-1514763) ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences(XDB09000000 ; Chinese Academy of Sciences(XDB09000000 ; Ministry of Finance ; Ministry of Finance ; Chinese National Natural Science Foundation(11433005) ; Chinese National Natural Science Foundation(11433005) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF Faculty Early Career Development (CAREER)(AST-1151462) ; NSF(AST-1412504 ; NSF(AST-1412504 ; Packard Fellowship ; Packard Fellowship ; 114A11KYSB20160057) ; 114A11KYSB20160057) ; AST-1514763) ; AST-1514763)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000419341900006
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20317
Collection光学天文研究部
Affiliation1.Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA
2.Haverford Coll, Dept Astron, 370 Lancaster Ave, Haverford, PA 19041 USA
3.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA
4.Univ Arizona, LSST, 933 N Cherry Ave, Tucson, AZ 85721 USA
5.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
6.Texas Tech Univ, Dept Phys & Astron, Box 41051, Lubbock, TX 79409 USA
7.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
8.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Garling, Christopher,Willman, Beth,Sand, David J.,et al. Mapping the Tidal Destruction of the Hercules Dwarf: A Wide-field DECam Imaging Search for RR Lyrae Stars[J]. ASTROPHYSICAL JOURNAL,2018,852(1).
APA Garling, Christopher.,Willman, Beth.,Sand, David J..,Hargis, Jonathan.,Crnojevic, Denija.,...&Peng, Xiyan.(2018).Mapping the Tidal Destruction of the Hercules Dwarf: A Wide-field DECam Imaging Search for RR Lyrae Stars.ASTROPHYSICAL JOURNAL,852(1).
MLA Garling, Christopher,et al."Mapping the Tidal Destruction of the Hercules Dwarf: A Wide-field DECam Imaging Search for RR Lyrae Stars".ASTROPHYSICAL JOURNAL 852.1(2018).
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