后星暴星系：不仅仅是一个有趣的好奇心
Post-starburst galaxies: more than just an interesting curiosity
摘要：
从VIMOS VLT深度巡天（VVDS），我们选择了一个样本的16个星系的光谱，确定他们最近经历了一个强大的恒星爆发和随后的快速淬火的恒星形成。这些后星暴星系的红移范围为0.5<z <1.0 with masses >10^9.75 Msun。它们的数密度为1 × 10 ^-4/Mpc ^3，比具有相同质量极限的全部星系要稀疏近两个数量级。我们比较模拟表明，星系是一致的，丰富的气体主要合并的后代。星暴质量分数必须大于~5-10%，衰变时间必须短于~10^8年，才能在模拟中观察到星暴后的光谱特征。我们发现，黑洞反馈的存在并没有很大的影响模拟合并残留物的演变通过后星爆阶段。星暴后星系的多波长光谱能量分布表明，5/16的星系已经完全停止了新恒星的形成。这5个星系对应于进入红玫瑰序列的质量流量（A->Q，PSB）= 0.0038 Msun/Mpc^3/yr，假设定义的光谱特征在0.35 Gyr时可以检测到。如果星系随后保持在红色序列上，这将占红色序列增长率的38（+4/-11）%。最后，我们将我们的高红移结果与SDSS和UKIDSS巡天中观测到的0.05<z<0.1的星系样本进行了比较。我们发现了一个非常强的红移演化：在z~0.07时，强后星暴星系的质量密度比z~ 0.7时低230倍。
英文摘要：
From the VIMOS VLT DEEP Survey (VVDS) we select a sample of 16 galaxies with spectra which identify them as having recently undergone a strong starburst and subsequent fast quenching of star formation. These post-starburst galaxies lie in the redshift range 0.5<z<1.0 with masses >10^9.75Msun. They have a number density of 1x10^-4 per Mpc^3, almost two orders of magnitude sparser than the full galaxy population with the same mass limit. We compare with simulations to show that the galaxies are consistent with being the descendants of gas rich major mergers. Starburst mass fractions must be larger than ~5-10% and decay times shorter than ~10^8 years for post-starburst spectral signatures to be observed in the simulations. We find that the presence of black hole feedback does not greatly affect the evolution of the simulated merger remnants through the post-starburst phase. The multiwavelength spectral energy distributions of the post-starburst galaxies show that 5/16 have completely ceased the formation of new stars. These 5 galaxies correspond to a mass flux entering the red-sequence of rhodot(A->Q, PSB) = 0.0038Msun/Mpc^3/yr, assuming the defining spectroscopic features are detectable for 0.35Gyr. If the galaxies subsequently remain on the red sequence, this accounts for 38(+4/-11)% of the growth rate of the red sequence. Finally, we compare our high redshift results with a sample of galaxies with 0.05<z<0.1 observed in the SDSS and UKIDSS surveys. We find a very strong redshift evolution: the mass density of strong post-starburst galaxies is 230 times lower at z~0.07 than at z~0.7.
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