RASS --6dFGS星表：从6dF星系巡天中选出的X射线AGN样本
The RASS--6dFGS catalogue: a sample of X-ray selected AGN from the 6dF Galaxy Survey
摘要：
我们提出了一个目录的3405 X射线源从ROSAT全天巡天（RASS）明亮的源目录，属于6 dF星系巡天（6 dFGS）所涵盖的区域。该星表在X射线中的计数率限制在0.05 cts \s，并以10度的增量覆盖天空区域< 0 deg and |b| >。RASS-6dFGS样品是6dFGS的附加目标目录之一，因此我们获得了2224（65%）RASS源的光谱。其中，1715颗（77%）有可靠的红移，红移中值为z=0.16（不包括银河系源）。对于观测样品中的光学亮源（b_J < 17.5），90%以上的样品具有可靠的红移。该目录主要包括类星体和活动星系，但也包括238个银河系源。在具有可靠红移的源中，大多数是1型活动星系核（69%），12%是2型活动星系核，6%是吸收线星系，13%是恒星。我们还确定了少量的光学微弱，非常低的红移，紧凑的对象，落在b_J-z平面的一般趋势之外。我们检测918个源（27%）的RASS-6dFGS样本的无线电使用1.4 GHz的NRAO VLA巡天（NVSS）或843 MHz的悉尼大学莫隆格洛巡天（SUMSS）目录，并发现检测率随红移的变化。当红移大于1时，几乎所有这些源都有对应的射电源，其平均通量密度为1.15兆焦耳，比整个样本的平均通量密度28.6兆焦耳强得多。我们把这归因于这样一个事实，即这些物体的X射线通量被喷流分量增强，可能是多普勒增强，这只存在于无线电响亮的活动星系核。（节略本）
英文摘要：
We present a catalogue of 3405 X-ray sources from the ROSAT All Sky Survey (RASS) Bright Source Catalogue which fall within the area covered by the 6dF Galaxy Survey (6dFGS). The catalogue is count-rate limited at 0.05 cts\s in the X-ray and covers the area of sky with delta < 0 deg and |b|>10 deg. The RASS--6dFGS sample was one of the additional target catalogues of the 6dFGS and as a result we obtained optical spectra for 2224 (65%) RASS sources. Of these, 1715 (77%) have reliable redshifts with a median redshift of z=0.16 (excluding the Galactic sources). For the optically bright sources (b_J < 17.5) in the observed sample, over 90% have reliable redshifts. The catalogue mainly comprises QSOs and active galaxies but also includes 238 Galactic sources. Of the sources with reliable redshifts the majority are Type 1 AGN (69%), while 12% are Type 2 AGN, 6% absorption-line galaxies and 13% are stars. We also identify a small number of optically-faint, very low redshift, compact objects which fall outside the general trend in the b_J-z plane. We detect 918 sources (27%) of the RASS--6dFGS sample in the radio using either the 1.4 GHz NRAO VLA Sky Survey (NVSS) or the 843 MHz Sydney University Molonglo Sky Survey (SUMSS) catalogues and find that the detection rate changes with redshift. At redshifts larger than 1 virtually all of these sources have radio counterparts and with a median flux density of 1.15 Jy, they are much stronger than the median flux density of 28.6 mJy for the full sample. We attribute this to the fact that the X-ray flux of these objects is being boosted by a jet component, possibly Doppler boosted, that is only present in radio-loud AGN. (abridged version)
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