Unveiling the nature of INTEGRAL objects through optical spectroscopy. VI. A multi-observatory identification campaign
N. Masetti, E. Mason, L. Morelli, S. A. Cellone, V. A. McBride, E. Palazzi, L. Bassani, A. Bazzano, A. J. Bird, P. A. Charles, A. J. Dean, G. Galaz, N. Gehrels,… 展开作者
N. Masetti, E. Mason, L. Morelli, S. A. Cellone, V. A. McBride, E. Palazzi, L. Bassani, A. Bazzano, A. J. Bird, P. A. Charles, A. J. Dean, G. Galaz, N. Gehrels, R. Landi, A. Malizia, D. Minniti, F. Panessa, G. E. Romero, J. B. Stephen, P. Ubertini, R. Walter
备注：
20 pages, 14 figures, 7 tables. Accepted for publication on Astronomy & Astrophysics, main journal. Figures 1-5 are in .jpg format to fit the arXiv uploads size limits
Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, we performed a systematic optical spectroscopic study of 39 putative counterparts of unidentified or poorly studied INTEGRAL sources in order to determine or at least better assess their nature. This was implemented within the framework of our campaign to reveal the nature of newly-discovered and/or unidentified sources detected by INTEGRAL. Our results show that 29 of these objects are active galactic nuclei (13 of which are of Seyfert 1 type, 15 are Seyfert 2 galaxies and one is possibly a BL Lac object) with redshifts between 0.011 and 0.316, 7 are X-ray binaries (5 with high-mass companions and 2 with low-mass secondaries), one is a magnetic cataclysmic variable, one is a symbiotic star and one is possibly an active star. Thus, the large majority (74%) of the identifications in this sample belongs to the AGN class. When possible, the main physical parameters for these hard X-ray sources were also computed using the multiwavelength information available in the literature. These identifications further underscore the importance of INTEGRAL in studying the hard X-ray spectra of all classes of X-ray emitting objects, and the effectiveness of a strategy of multi-catalogue cross-correlation plus optical spectroscopy to securely pinpoint the actual nature of still unidentified hard X-ray sources.
Results from an extensive simultaneous broadband campaign on the underluminous active nucleus M81*: further evidence for mass-scaling accretion in black holes
本文介绍了对附近低光度活动星系核M81* 进行宽带同步观测的结果。从2005年2月到8月，我们使用钱德拉X射线天文台的高能透射光栅光谱仪对M81* 进行了五次观测，并辅以巨型米波射电望远镜、甚大阵和甚大基线阵、IRAM的Plateau de Bure干涉仪、亚毫米阵和Lick天文台的地面观测。我们讨论了与以前的结果相比，所得光谱在短时间和长时间尺度上的变化，特别是在X射线中，这是第一次以足够高的空间分辨率进行长期运动，几乎可以隔离核（17pc）。我们比较我们的银河系中心弱活性核Sgr A*，它经历了类似的运动，以及弱吸积的X射线双星的背景下流出为主的模型的光谱。最近的结果表明，弱吸积黑洞的物理规模与质量可预测的协议，我们发现，完全相同的模型，成功地描述了硬态X射线双星适用于M81*，具有非常相似的物理参数。
Unveiling the multi-wavelength phenomenology of Anomalous X-ray Pulsars
在2002-2003年期间，在这一类别的六个评估对象中，红外线识别的异常X射线脉冲星（AXP）的对应物的数量增加到四个（4U 0142 +614，2 E 2259 +584，1 E 1048-59和1 RXS J170849-400910），加上两个候选者。更重要的是，我们发现了一些新的共同观测特征，如红外光谱的变化、红外宽带能谱的平坦化、X射线谱随脉冲相位的变化（这是磁星模型所不能预测的）以及类SGR爆发（这是标准吸积模型所不能解释的）。我们提出了从广泛的多波长观测活动中获得的结果，这些活动收集了NTT，CFHT的光学/IR波段数据，以及XMM，Chandra（加上BeppoSAX存档数据）的X射线数据。在此基础上，对AXP的红外-X射线带发射进行了比较研究。
Calibration of the Relationship between Precipitable Water Vapor and 225 GHz Atmospheric Opacity via Optical Echelle Spectroscopy at Las Campanas Observatory
Observations of the Unidentified TeV Gamma-Ray Source TeV J2032+4130 with the Whipple Observatory 10 m Telescope
我们报告的天空区域周围的不明TeV伽马射线源TeV J2032+4130进行了惠普尔天文台10米大气切伦科夫望远镜的观测，共65.5小时之间2003年和2005年。由惠普尔合作为独立望远镜开发的标准二维分析显示，在6.1标准差的试验前显著性水平下，视场过量。测量到的这个过量的位置是alpha（2000）=20 h 32 m 27 s，delta（2000）= 41 deg 39 min 17 s。这个伽马射线源的积分通量估计约为蟹状星云通量的8%。数据与点状源一致。在这里，我们提出了一个详细的描述标准的二维分析技术，用于与惠普尔天文台10米望远镜和TeV J2032+4130运动的结果所采取的数据分析。我们包括一个简短的讨论的物理机制，可能是负责所观察到的伽马射线发射，根据可能与已知的天体，特别是天鹅座OB2。
