The 2dF QSO Redshift Survey - I. The Optical QSO Luminosity Function
The 2dF QSO Redshift Survey - I. The Optical QSO Luminosity Function
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DOI：
10.1046/j.1365-8711.2000.03730.x
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发表时间：
2000-05
期刊：
影响因子：
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通讯作者：
B.J.Boyle;T.Shanks;S.M.Croom;R.J.Smith;L.Miller;N.Loaring;C.Heymans
中科院分区：
文献类型：
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作者：
B.J.Boyle;T.Shanks;S.M.Croom;R.J.Smith;L.Miller;N.Loaring;C.Heymans
我们给出了一个主要由2df类星体红移测量(2QZ)的fi第一次观测得到的6,000多个类星体的红移样本，确定了光学类星体光度函数及其红移宇宙学演化。适用于−26；M B<；−23和0的类星体。35；z<；2.3，我们fi发现，纯光度演化模型对观测到的光度函数红移依赖关系提供了可接受的fit。光度函数的最佳fit由形式为Φ(L B)∝[(L B/L∗B)α+(L B/L∗B)β]−1.无论是作为回顾时间的函数L∗B(Z)=L∗B(0)e k 1τ，还是作为一般二次多项式的L∗B(Z)∝10 k 1 z+k 2z 2，指数光度演化模型都被发现对由2QZ和大亮度类星体调查组成的数据集提供了可接受的fits。当Q0=0时，选择带回顾时间的指数演化。05，而当Q0=0时，则首选多项式演化模型。5.低红移(z<；0.5)和/或高亮度，目前没有被2DF类星体测量很好地采样，可能显示出与纯光度演化的背离，但这里的结果表明，在显著的fi不能红移的范围内，PLE可以很好地描述类星体的演化。
We present a determination of the optical QSO luminosity function and its cosmological evolution with redshift for a sample of over 6000 QSOs identified primarily from the first observations of the 2dF QSO Redshift Survey (2QZ). For QSOs with − 26 < M B < − 23 and 0 . 35 < z < 2 . 3, we find that pure luminosity evolution (PLE) models provide an acceptable fit to the observed redshift dependence of the luminosity function. The luminosity function is best fit by a two-power-law function of the form Φ( L B ) ∝ [( L B /L ∗ B ) α + ( L B /L ∗ B ) β ] − 1 . Exponential luminosity evolution models, both as a function of look-back time, L ∗ B ( z ) = L ∗ B (0)e k 1 τ , and as a general second-order polynomial, L ∗ B ( z ) ∝ 10 k 1 z + k 2 z 2 , were found to provide acceptable fits to the dataset comprising the 2QZ and the Large Bright Quasar Survey. Exponential evolution with look-back time is prefered for q 0 = 0 . 05, while the polynomial evolution model is prefered for q 0 = 0 . 5. The shape and evolution of the LF at low redshifts ( z < 0 . 5) and/or high luminosities, not currently well sampled by the 2dF QSO survey, may show departures from pure luminosity evolution, but the results presented here show that over a significant range of redshift, PLE is a good description of QSO evolution.