arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新，休息一下吧，周末愉快~~
arXiv 1006.4416astro-ph.SR
收藏

UV光度学和双星相互作用对光度红移和星系形态的影响

The effects of UV photometry and binary interactions on photometric redshift and galaxy morphology

F. Zhang, Z. Han, L. Li, H. Shan, Y. Zhang

备注：
23 pages, 33 figures, accepted by MNRAS
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

使用Hyperz代码和一个由Coleman，Wu & Weedman（CWW，1980）的4个观测星系光谱组成的模板光谱库和8个由演化总体合成模型建立的光谱族，我们给出了6，531个星系光谱样本的光度红移估计（photo-z）和1，502个亮星系形态样本的形态。所有星系都与SDSS DR 7和GALEX DR 4相匹配。包括Fuv或Nuv或两者的光度测定减少了灾难性识别的数量（CI，|z_phot -z_spec|> 1.0）。如果CI被移除，则Fuv和Nuv测光的加入主要增加了低红移、g-r < 0.8和较暗r星等区域的非CI数量。在仅使用光学光度法的情况下，二元相互作用（BI）的引入主要增加了非CI的数量，并减小了0.3 < g-r < 0.8区域的偏差。包括紫外光光度测定将减少和增加早期类型分别被分类为Burst和E类型的可能性，并增加晚期类型被分类为CWW-Sbc和CWW-Scd类型的可能性。如果排除CI，UV数据的包含主要提高了所有红移、蓝g-r和r > 14区域中晚期类型的识别。此外，生物指示剂主要影响E和S 0型的测定。Nuv-u = 1.94和5.77-1.47（u-r）= Fuv判别器可用作形态学选择指标。这两个判据在选择早型和晚型星系时的可靠性和完整性与C=2.6判据相当，而在选择早型星系时的完整性高于u-r=2.22判据。

英文摘要：

Using the Hyperz code and a template spectral library which consists of 4 observed galaxy spectra from Coleman, Wu & Weedman (CWW, 1980) and 8 spectral families built with evolutionary population synthesis models, we present photometric redshift estimates (photo-z) for a spectroscopic sample of 6,531 galaxies, and morphologies for a morphological sample of 1,502 bright galaxies. All galaxies are matched with the SDSS DR7 and GALEX DR4. The inclusion of Fuv or Nuv or both photometry decreases the number of catastrophic identifications (CIs, |z_phot -z_spec| > 1.0). If CIs are removed, the inclusion of both Fuv and Nuv photometry mainly increases the number of non-CIs in the low redshift, g-r < 0.8 and fainter r-magnitude regions. The inclusion of binary interactions (BIs) mainly increases the number of non-CIs and decreases the deviations in the 0.3 < g-r < 0.8 region in the case of only using optical photometry. The inclusion of UV photometry would decrease and increase the probability that early types are classified as Burst and E types, respectively, and increase that late types are classified as CWW-Sbc and CWW-Scd types. If CIs are excluded, the inclusion of UV data mainly raises the identifications of late types in all redshift, bluer g-r and r > 14 regions. Moreover, BIs mainly affect the determinations of E and S0 types. Nuv -u = 1.94 and 5.77-1.47(u-r) = Fuv discriminators can be used as morphology selection indicators. These two criteria have comparable reliability and completeness for selecting early- and late-type galaxies to C=2.6 criterion and higher completeness for early-type selection than u-r=2.22 criterion.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑