Wu Xuebing1; Zhang Wei1; Zhou Xu2
Source Publicationchinesejournalofastronomyandastrophysics
AbstractWith a recently constructed composite quasar spectrum and the chi(2) minimization technique, we describe a general method for estimating the photometric redshifts of a large sample of quasars by deriving theoretical color-redshift relations and comparing the theoretical colors with the observed ones. We estimated the photometric redshifts from the 5-band SDSS photometric data of 18678 quasars in the first major data release of SDSS and compared them with their spectroscopic redshifts. The difference is less than 0.1 for 47% of the quasars and less than 0.2 for 68%. Based on the calculation of the theoretical color-color diagrams of stars, galaxies and quasars both on the SDSS system and on the BATC system, we expect that we would be able to select candidates of high redshift quasars more efficaciously with the latter than with the former, provided the BATC survey can detect objects with magnitudes fainter than 21.
Document Type期刊论文
Recommended Citation
GB/T 7714
Wu Xuebing,Zhang Wei,Zhou Xu. colorredshiftrelationsandphotometricredshiftestimationsofquasarsinlargeskysurveys[J]. chinesejournalofastronomyandastrophysics,2004,4(1):17.
APA Wu Xuebing,Zhang Wei,&Zhou Xu.(2004).colorredshiftrelationsandphotometricredshiftestimationsofquasarsinlargeskysurveys.chinesejournalofastronomyandastrophysics,4(1),17.
MLA Wu Xuebing,et al."colorredshiftrelationsandphotometricredshiftestimationsofquasarsinlargeskysurveys".chinesejournalofastronomyandastrophysics 4.1(2004):17.
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