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Multicolor photometry of the galaxies in A2255 by the Beijing-Arizona-Taiwan-Connecticut survey and Sloan Digital Sky Survey
Yuan, QR; Zhou, X; Jiang, ZJ
2003-11-01
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume149Issue:1Pages:53-66
AbstractWe present our optical multicolor photometry for the nearby cluster of galaxies A2255 with 13 intermediate filters in the Beijing-Arizona-Taiwan-Connecticut ( BATC) system, which cover an optical wavelength range from 3000 to 10000 Angstrom. The spectral energy distributions (SEDs) in the optical band for more than 7000 sources are achieved down to V similar to 20 in a field of 58' x 58' centered on this rich cluster. A2255 has been recently observed by the Sloan Digital Sky Survey (SDSS) down to V similar to 17.5 spectroscopically and r' similar to 22.0 photometrically. A method of combining the SDSS photometric data in five broad bands and the BATC SEDs is then explored. A sample of 254 galaxies with known redshifts in the region of A2255 is constructed for testing the reliability of the method of combining SEDs. Our application of the technique of photometric redshift on this sample shows that the combined SEDs with higher resolution could lead to a more accurate estimate of photometric redshift. Based on 214 spectroscopically confirmed member galaxies, spatial and dynamical properties of this cluster are studied. Bimodality and large dispersion in the velocity distribution indicate that A2255 is an unrelaxed system. A tight color-magnitude correlation for 188 known early-type cluster galaxies is found. After an exclusion of 254 extragalactic sources with known redshifts, the combined SEDs for 2522 galaxies allow a further membership selection by the photometric redshift technique and color-magnitude correlation. As a result, 313 galaxies with photometric redshifts between 0.068 and 0.090 are selected as new cluster members. The combined SEDs and estimated redshifts for previously known and newly selected member galaxies are cataloged. On the basis of the enlarged sample of member galaxies, the spatial distribution, localized velocity structure, color-magnitude relation, and luminosity function of cluster galaxies are discussed. The reverse peculiar velocities are found for two satellite subclusters located on opposite sides of the central concentration, which supports an ongoing merger in A2255.
KeywordGalaxies : Clusters : Individual (A2255) Galaxies : Distances And Redshifts Galaxies : Fundamental Parameters Galaxies : Photometry Methods : Data Analysis
Indexed BySCI
Language英语
WOS IDWOS:000186172200003
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8457
Collection光学天文研究部
Affiliation1.Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Yuan, QR,Zhou, X,Jiang, ZJ. Multicolor photometry of the galaxies in A2255 by the Beijing-Arizona-Taiwan-Connecticut survey and Sloan Digital Sky Survey[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2003,149(1):53-66.
APA Yuan, QR,Zhou, X,&Jiang, ZJ.(2003).Multicolor photometry of the galaxies in A2255 by the Beijing-Arizona-Taiwan-Connecticut survey and Sloan Digital Sky Survey.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,149(1),53-66.
MLA Yuan, QR,et al."Multicolor photometry of the galaxies in A2255 by the Beijing-Arizona-Taiwan-Connecticut survey and Sloan Digital Sky Survey".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 149.1(2003):53-66.
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