基于相似性度量的星系光谱红移估计

doi:10.3964/j.issn.1000-0593.2008.01.057

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Abstract Automated spectra analysis is desirable and necessary for efficiency of large sky surveys such as SDSS (Sloan digital sky survey),2DF (2 degree fields) and LAMOST (large sky area multi-object spectroscopic telescope). In the present paper, we present a method for redshift estimation of galaxy spectra based on similarity measure. Firstly, we extract the spectral lines of the observed spectrum using the feature constrains of spectral lines; secondly, the authors determine the redshift candidates of the observed spectrum by spectral line features; then, the similarity between the observed spectrum and the template spectra shifted by each redshift candidate is measured; finally, the candidate of the highest similarity is chosen as the estimated redshift. PCA (principal component analysis) is used to build the static galaxy template spectra. The authors perform PCA for the four template spectra E, S0, Sa and Sb of the normal galaxy and the seven template spectra Sc, Sb1, Sb2, Sb3, Sb4, Sb5 and Sb6 of the starburst galaxy respectively, where the eleven template spectra are presented by Kinney & Calzetti et al. Two eigen-spectra are produced with the variance contribution rate of 99%. The authors choose the two eigen-spectra as the galaxy templates. The similarity measure proposed, which is similar to the evidence accumulation, is defined as the weighted sum of several similarity evidences. It can reduce the influence caused by some error matching. The authors divide the observed spectrum and the template spectrum respectively into several parts, and measure the correlations of the corresponding parts of them, which is chosen as the similarity evidences in the proposed similarity measure. The principle of setting the weights is that the higher the correlation, the higher the corresponding weight. The proposed approach is compared with the method based on spectral line matching and the traditional cross correlation technique by experiments, the results show that the proposed method has a higher correct rate.

Key words：Galaxy;Spectral analysis;Redshift

Received: 2007-01-28 Accepted: 2007-05-09

ZTFLH:

TN911.7

Corresponding Authors: DUAN Fu-qing E-mail: fqduan@bnu.edu.cn

Cite this article:

LIU Rong,QIAO Xue-jun,DUAN Fu-qing. Redshift Estimation of Galaxy Spectra Based on Similarity Measure[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(01): 235-238.

URL:

http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593.2008.01.057 OR http://www.gpxygpfx.com/EN/Y2008/V28/I01/235

[1] Connolly A J, Budavari T, Szalay A S, et al. in ASP Conf. Ser., 1999, 191: 13.
[2] Weinstein M A, Richards G T, Schneider D P, et al. Astrophysical Journal, Supplement Series(ApJS),2004, 155: 243.
[3] Wu X B, Zhang W, Zhou X. Chinese Journal of Astronomy and Astrophysics,2004, 4(1): 17.
[4] Xia L F, Zhou X, Ma J, et al. Publication of the Astronomical Society of the Pacific(PASP),2002, 144: 1349.
[5] Tonry J, Davis M. Astronomical Journal, 1979, 84(10)：1511.
[6] DUAN Fu-qing, WU Fu-chao, LUO A-li, et al(段福庆，吴福朝，罗阿理, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2005，25(11)：1895.
[7] ZHOU Hong, HUANG Ling-yun, LUO Man-li(周虹，黄凌云，罗曼丽). J. of Electronics(电子科学学刊)，2000，22(7)：529.
[8] LIU Rong, DUAN Fu-qing LIU San-yang, et al(刘蓉，段福庆，刘三阳, 等). Journal of Electronics & Information Technology(电子与信息学报)，2006，28(1)：76.
[9] QIU Bo，HU Zhan-yi，ZHAO Yong-heng(邱波，胡占义，赵永恒). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2002，22(4)：695.
[10] DUAN Fu-qing, WU Fu-chao, LUO A-li, et al(段福庆，吴福朝，罗阿理，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2005，25(11)：1884.
[11] ZHAO Rui-zhen，LUO A-li(赵瑞珍，罗阿理). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2006，26(3)：587.
[12] ZHAO Rui-zhen，HU Zhan-yi，ZHAO Yong-heng(赵瑞珍，胡占义，赵永恒). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2005，25(1)：153.
[13] LIU Rong, LIU San-yang, ZHAO Rui-zhen(刘蓉，刘三阳, 赵瑞珍). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2006，26(3)：583.
[14] LIU Rong, DUAN Fu-qing, LIU San-yang(刘蓉，段福庆，刘三阳). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2007，27(8)：1648.
[15] Glazebrook K, Offer A R, Deeley K. Astrophysical Journal，1998，492(1): 98.
[16] Bailer-Jones C, Irwin M, Von Hippel T. Monthly Notices of Royal Astronmical Society(MNRAS), 1998,298(2): 361.
[17] HUANG Ling-yun, HU Zhan-yi(黄凌云, 胡占义). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2003,23(1): 187.
[18] Huang L Y, Sun F M, Hu Z Y. Proceedings of the 15th ICPR,2000,2: 499.
[19] Kinney A L，Calzetti D，Bohlin R C，et al. Astrophysical Journal，1996，467(8)：38.
[20] Vanden Berk D E, Richards G T, et al. Astronomical Journal，2001，122(2)：549.