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| 題名: | CAN WE DETECT the COLOR-DENSITY RELATION with PHOTOMETRIC REDSHIFTS? |
| 作者: | 陳文屏;Lai, Chuan-Chin;Lin, Lihwai;Jian, Hung-Yu;Chiueh, Tzi-Hong;Merson, Alex;Baugh, Carlton M.;Foucaud, Sebastien;Chen, Chin-Wei;Chen, Wen-Ping |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;COLOR;COMPARATIVE EVALUATIONS;Confidence intervals;Correlation analysis;CORRELATIONS;DENSITY;Density measurement;GALACTIC EVOLUTION;GALAXIES;galaxies: evolution;galaxies: formation;galaxies: halos;OPTIMIZATION;Parameters;Photometry;RED SHIFT;SPACE |
| 日期: | 2016-07-01 |
| 上傳時間: | 2026-04-21 14:53:21 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;United States: The American Astronomical Society |
| 摘要: | 摘要： ABSTRACT A variety of methods have been proposed to define and to quantify galaxy environments. While these techniques work well in general with spectroscopic redshift samples, their application to photometric redshift surveys remains uncertain. To investigate whether galaxy environments can be robustly measured with photo-z samples, we quantify how the density measured with the nearest-neighbor approach is affected by photo-z uncertainties by using the Durham mock galaxy catalogs in which the 3D real-space environments and the properties of galaxies are known exactly. Furthermore, we present an optimization scheme in the choice of parameters used in the 2D projected measurements that yield the tightest correlation with respect to the 3D real-space environments. By adopting the optimized parameters in the density measurements, we show that the correlation between the 2D projected optimized density and the real-space density can still be revealed, and the color-density relation is also visible out to z ∼ 0.8 even for a photo-z uncertainty ( ) up to 0.06. We find that at redshifts 0.3 < z < 0.5 a deep (i ∼ 25) photometric redshift survey with yields a performance in small-scale density measurement that is comparable to a shallower i ∼ 22.5 spectroscopic sample with ∼10% sampling rate. Finally, we discuss the application of the local density measurements to the Pan-STARRS1 Medium Deep Survey (PS-MDS), one of the largest deep optical imaging surveys. Using data from ∼5 square degrees of survey area, our results show that it is possible to measure local density and to probe the color-density relation with 3 confidence level out to z ∼ 0.8 in the PS-MDS. The color-density relation, however, quickly degrades for data covering smaller areas.
其他題名： APJ
其他題名： Astrophys. J
出版者： United States: The American Astronomical Society
出版日期： 2016-07-01
出處： The Astrophysical journal, 2016-07, Vol.825 (1), p.40-40
資源來源： Institute of Physics Journals
版權： 2016. The American Astronomical Society. All rights reserved.
識別號： ISSN: 0004-637X
識別號： ISSN: 1538-4357
識別號： EISSN: 1538-4357
識別號： DOI: 10.3847/0004-637X/825/1/40 |
| 顯示於類別: | [天文研究所] 期刊論文
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