xBootes场中FIRST射电源的X射线鉴别
X-ray Identifications of FIRST Radio Sources in the xBootes Field
摘要：
为了研究弱射电源（mJ级）的性质和环境，本文介绍了利用Chandra XBootes巡天数据，在NOAO深宽场巡天（NDWFS）的9平方度Bootes场中进行的20厘米弱成像射电巡天（FIRST）的X射线识别结果。总共有92个（10%）FIRST射电源被识别出超过X射线通量极限f_X（0.5-7）keV = 8 × 10 ^{-15} erg s^{-1} cm^{-2}，79个光学对应物是射电源和X射线源共同的。光谱鉴定可用于22个来源（27%）。多波长光学/红外测光数据（Bw~25.5 mag，R~25.8 mag，I~25.5 mag和K~19.4 mag）可用于该领域，并用于推导其余57个源的光度红移，而无需光谱信息。大多数射电X射线匹配是在R波段的光学扩展对象，具有在z~0.7处达到峰值的光度红移分布。根据硬度比和X射线光度，37个（89%）源被归类为活动星系核-1，19个为活动星系核-2，12个为类星体-1，2个为类星体-2，9个为正常星系。虽然这些源中的大多数具有硬X射线光度L_X（2-7）keV >10^{42} erg s^{-1}，但大约三分之一的源具有L_X（2-7）keV >10^{44} erg s^{-1}，因此被归类为类星体1。在射电-X射线匹配的总体中，大部分（68%）具有-1<logl_X/f_opt<1的活动星系核区域，23%具有高的X射线-光通量比（log f_X/f_opt > 1），表明活动星系核存在着高红移和/或尘埃遮蔽，而11%的射电X射线匹配是log f_X/f_opt <-1的X射线微弱的光学亮源，并且这些源中的大多数是光学扩展的。这些物体是低z，正常星系或低光度活动星系核（LINERS）。
英文摘要：
With the goal of investigating the nature and the environment of the faint radio sources (at mJy level), here are presented results of X-ray dentifications of Faint Imaging Radio Survey at Twenty centimetres (FIRST) in the 9 square degrees Bootes field of the NOAO Deep Wide Field Survey (NDWFS), using data from the Chandra XBootes survey. A total of 92 (10%) FIRST radio sources are identified above the X-ray flux limit f_X (0.5-7) keV = 8x10^{-15} erg s^{-1} cm^{-2}, and 79 optical counterparts are common to both the radio and X-ray sources. Spectroscopic identifications were available for 22 sources (27%). Multi-wavelength optical/infrared photometric data (Bw~25.5 mag, R~25.8 mag, I~25.5 mag and K~19.4 mag) were available for this field and were used to derive photometric redshift for the remaining 57 sources without spectroscopic information. Most of the radio-X-ray matches are optically extended objects in the R band with a photometric redshift distribution peaking at z~0.7. Based on the hardness ratio and X-ray luminosity, 37 sources (89%) were classified as AGN-1, 19 as AGN-2, 12 as QSO-1, 2 as QSO-2 and 9 sources as normal galaxies. While the majority of these sources have a hard X-ray luminosity L_X(2-7) keV >10^{42} erg s^{-1}, about one third of the sources have L_X(2-7) keV >10^{44} erg s^{-1} and therefore classified as QSO-1. The majority (68%) of the radio-X-ray matched population are found to have -1<log l_X/f_opt<1, region indicative of AGNs, 23% with high X-ray-to-optical flux ratio (log f_X/f_opt > 1), suggesting high redshift and/or dust obscured AGN, and 11% of the radio-X-ray matches that are X-ray faint optically bright sources with log f_X/f_opt <-1, and most of these sources are optically extended. These objects are low-z, normal galaxies or low luminosity AGNs (LINERS).
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