首页> 外文期刊>The Astrophysical Journal. Supplement Series >The UV-optical galaxy color-magnitude diagram. III. Constraints on evolution from the blue to the red sequence
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The UV-optical galaxy color-magnitude diagram. III. Constraints on evolution from the blue to the red sequence

机译:紫外光星系颜色幅度图。 III。 从蓝色到红色序列的演变约束

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We introduce a new quantity, the mass flux density of galaxies evolving from the blue sequence to the red sequence. We propose a simple technique for constraining this mass flux using the volume-corrected number density in the extinction-corrected UV-optical color-magnitude distribution, the stellar age indexes H delta(A) and D-n(4000), and a simple prescription for spectral evolution using a quenched star formation history. We exploit the excellent separation of red and blue sequences in the NUV-r band Hess function. The final value we measure, <(rho)over dot>(T) = 0.033 M-circle dot yr(-1) Mpc(-3), is strictly speaking an upper limit due to the possible contributions of bursting, composite, and extincted galaxies. However, it compares favorably with estimates of the average mass flux that we make based on the red luminosity function evolution derived from the DEEP2 and COMBO-17 surveys,<(rho)over dot>(R) = +0.034 M-circle dot yr(-1) Mpc(-3). We find that the blue sequence mass has remained roughly constant since z 1 (<(rho)over dot>B similar or equal to 0.01M(circle dot) yr(-1) Mpc(-3), but the average on- going star formation of <(rho)over dot>(SF) similar or equal to 0.037M(circle dot) yr(-1) Mpc(-3) over 0 < z < 1 is balanced by mass flux off the blue sequence. We explore the nature of the galaxies in the transition zone with particular attention to the frequency and impact of active galactic nuclei (AGNs). The AGN fraction peaks in the transition zone. We find circumstantial, albeit weak evidence that the quench rates are higher in higher luminosity AGNs.
机译:我们介绍了新的数量,从蓝色序列进化到红色序列的星系的质量磁通密度。我们提出了一种简单的技术,用于使用灭过校正的紫外光色调分布中的体积校正数密度来限制该质量磁通,恒星年龄指数H Delta(A)和DN(4000),以及简单的处方使用淬火星形成历史的光谱演化。我们利用Nuv-R波纹功能中的红色和蓝色序列的优异分离。我们测量的最终值<(rho)(t)= 0.033 m圆点Yr(-1)MPC(-3),由于可能的爆破,复合材料和和灭绝的星系。然而,它与我们基于从Deep2和Combo-17调查的红色发光功能演进的平均质量通量的估计有利地比较了我们的估计,如DOT>(R)= +0.034 M圆点YR (-1)MPC(-3)。我们发现蓝色序列质量由于Z 1(<(rho)上的Z 1(<(rho)相似或等于0.01m(圆点)Yr(-1)MPC(-3),但平均持续在0.037M(圆点)Yr(-1)MPC(-3)上相似或等于0.037M(SF)的星形成(rhO),超过0

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