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RR LYRAE IN XSTPS: THE HALO DENSITY PROFILE IN THE NORTH GALACTIC CAP
Faccioli, L.1,2; Smith, M. C.1,2,3; Yuan, H. -B.1; Zhang, H. -H.4; Liu, X. -W.1,4; Zhao, H. -B.5; Yao, J. -S.5
2014-06-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume788Issue:2Pages:0
AbstractWe present a catalog of RR Lyrae stars (RRLs) observed by the Xuyi Schmidt Telescope Photometric Survey (XSTPS). The area we consider is located in the north Galactic cap, covering approximate to 376.75 deg(2) at a approximate to 150 degrees and delta approximate to 27 degrees. down to a magnitude limit of i approximate to 19 Using the variability information afforded by the multi-epoch nature of our XSTPS data, combined with colors from the Sloan Digital Sky Survey, we are able to identify candidate RRLs. We find 318 candidates, derive distances to them, and estimate the detection efficiency. The majority of our candidates have more than 12 observations, and for these we are able to calculate periods. These also allow us to estimate our contamination level, which we predict is between 30% and 40%. Finally, we use the sample to probe the halo density profile in the 9-49 kpc range and find that it can be well fitted by a double power law. We find good agreement between this model and the models derived for the south Galactic cap using the Watkins et al. and Sesar et al. RRL data sets, after accounting for possible contamination in our data set from Sagittarius stream members. We consider non-spherical double power-law models of the halo density profile and again find agreement with literature data sets, although we have limited power to constrain the flattening due to our small survey area. Much tighter constraints will be placed by current and future wide-area surveys, most notably ESA's astrometric Gaia mission. Our analysis demonstrates that surveys with a limited number of epochs can effectively be mined for RRLs. Our complete sample is provided as accompanying online material; as an example the first few entries of each electronic table are shown in the text.
KeywordGalaxy: Halo Galaxy: Stellar Content Galaxy: Structure Stars: Variables: Rr Lyrae Surveys Techniques: Photometric
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/788/2/105
WOS KeywordDIGITAL SKY SURVEY ; GRAVITATIONAL LENSING EXPERIMENT. ; MILKY-WAY TOMOGRAPHY ; OGLE-III CATALOG ; PERIOD-LUMINOSITY RELATION ; LARGE-MAGELLANIC-CLOUD ; VARIABLE SKY ; STELLAR HALO ; SUPERNOVA SURVEY ; 1ST CATALOG
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000337466200008
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10664
Collection盱眙天文观测站
Affiliation1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
4.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Faccioli, L.,Smith, M. C.,Yuan, H. -B.,et al. RR LYRAE IN XSTPS: THE HALO DENSITY PROFILE IN THE NORTH GALACTIC CAP[J]. ASTROPHYSICAL JOURNAL,2014,788(2):0.
APA Faccioli, L..,Smith, M. C..,Yuan, H. -B..,Zhang, H. -H..,Liu, X. -W..,...&Yao, J. -S..(2014).RR LYRAE IN XSTPS: THE HALO DENSITY PROFILE IN THE NORTH GALACTIC CAP.ASTROPHYSICAL JOURNAL,788(2),0.
MLA Faccioli, L.,et al."RR LYRAE IN XSTPS: THE HALO DENSITY PROFILE IN THE NORTH GALACTIC CAP".ASTROPHYSICAL JOURNAL 788.2(2014):0.
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