A universal ultraviolet-optical colour-colour-magnitude relation of galaxies

被引:162
作者
Chilingarian, Igor V. [1 ,2 ]
Zolotukhin, Ivan Yu. [2 ,3 ,4 ]
机构
[1] Univ Strasbourg, Ctr Donnees Astron Strasbourg, Observ Astron Strasbourg, CNRS UMR 7550, F-67000 Strasbourg, France
[2] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia
[3] Observ Paris, LERMA, UMR 8112, F-75014 Paris, France
[4] Observ Paris, VO Paris Data Ctr, F-75014 Paris, France
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
galaxies: distances and redshifts; galaxies: photometry; galaxies: stellar content; DIGITAL SKY SURVEY; SPECTROSCOPIC TARGET SELECTION; DWARF ELLIPTIC GALAXIES; STELLAR POPULATIONS; PHOTOMETRIC REDSHIFTS; DATA RELEASE; K-CORRECTIONS; INTERNAL KINEMATICS; EVOLUTION-EXPLORER; STAR-FORMATION;
D O I
10.1111/j.1365-2966.2011.19837.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The bimodal galaxy distribution in the optical colourmagnitude diagram (CMD) comprises a narrow red sequence populated mostly by early-type galaxies and a broad blue cloud dominated by star-forming systems. Although the optical CMD allows one to select red sequence objects, neither can it be used for galaxy classification without additional observational data such as spectra or high-resolution images, nor to identify blue galaxies at unknown redshifts. We show that adding the near ultraviolet (NUV) colour [Galaxy Evolution Explorer (GALEX) NUV ?eff= 227 nm] to the optical (g - r versus Mr) CMD reveals a tight relation in the 3D colourcolourmagnitude space smoothly continuing from the blue cloud to the red sequence. We found that 98 per cent of 225 000 low-redshift (Z < 0.27) galaxies follow a smooth surface with a standard deviation of 0.030.07 mag making it the tightest known galaxy photometric relation, given the similar to 0.9 mag range of k-corrected g - r colours. Similar relations exist in other NUVoptical colours. There is a strong correlation between morphological types and integrated colours of galaxies, while the connection with g - r is ambiguous. Rare galaxy classes such as E+A or tidally stripped systems become outliers that occupy distinct regions in the 3D parameter space. Using stellar population models for galaxies with different star formation histories, we show that (a) the () distribution at a given luminosity is formed by objects having constant and exponentially declining star formation rates with different characteristic time-scales with the red sequence part consistent also with simple stellar population; (b) colour evolution for exponentially declining models goes along the relation suggesting a weak evolution of its shape up to a redshift of 0.9; (c) galaxies with truncated star formation histories have very short transition phase offset from the relation thus explaining the rareness of E+A galaxies. This relation can be used as a powerful galaxy classification tool when morphology remains unresolved. Its mathematical consequence is the possibility of precise and simple redshift estimates from only three broad-band photometric points. We show that this simple approach being applied to Sloan Digital Sky Survey and GALEX data works better than most existing photometric redshift techniques applied to multicolour data sets. Therefore, the relation can be used as an efficient search technique for galaxies at intermediate redshifts (0.3 < Z < 0.8) using optical imaging surveys.
引用
收藏
页码:1727 / 1739
页数:13
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