Initial Data Release from the INT Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS)
E. A. Gonzalez-Solares, N. A. Walton, R. Greimel, J. E. Drew, M. J. Irwin, S. E. Sale, K. Andrews, A. Aungwerojwit, M. J. Barlow, E. van den Besselaar, R. L. M.… 展开作者
E. A. Gonzalez-Solares, N. A. Walton, R. Greimel, J. E. Drew, M. J. Irwin, S. E. Sale, K. Andrews, A. Aungwerojwit, M. J. Barlow, E. van den Besselaar, R. L. M. Corradi, B. T. Gaensicke, P. J. Groot, A. S. Hales, E. C. Hopewell, H. Hu, J. Irwin, C. Knigge, E. Lagadec, P. Leisy, J. R. Lewis, A. Mampaso, M. Matsuura, B. Moont, L. Morales-Rueda, R. A. H. Morris, T. Naylor, Q. A. Parker, P. Prema, S. Pyrzas, G. T. Rixon, P. Rodriguez-Gil, G. Roelofs, L. Sabin, I. Skillen, J. Suso, R. Tata, K. Viironen, J. S. Vink, A. Witham, N. J. Wright, A. A. Zijlstra, A. Zurita, J. Drake, J. Fabregat, D. J. Lennon, P. W. Lucas, E. L. Martin, D. Steeghs, Y. C. Unruh
The INT/WFC Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS) is an imaging survey being carried out in H-alpha, r' and i' filters, with the Wide Field Camera (WFC) on the 2.5-metre Isaac Newton Telescope (INT) to a depth of r'=20 (10 sigma). The survey is aimed at revealing large scale structure in our local galaxy, and also the properties of key early and late populations making up the Milky Way. Mapping emission line objects enables a particular focus on objects in the young and old stages of stellar evolution ranging from early T-Tauri stars to late planetary nebulae. In this paper we present the IPHAS Initial Data Release, primarily a photometric catalogue of about 200 million unique objects, coupled with associated image data covering about 1600 square degrees in three passbands. We note how access to the primary data products has been implemented through use of standard virtual observatory publishing interfaces. Simple traditional web access is provided to the main IPHAS photometric catalogue, in addition to a number of common catalogues (such as 2MASS) which are of immediate relevance. Access through the AstroGrid VO Desktop opens up the full range of analysis options, and allows full integration with the wider range of data and services available through the Virtual Observatory. The IDR represents the largest dataset published primarily through VO interfaces to date, and so stands as an examplar of the future of survey data mining. Examples of data access are given, including a cross-matching of IPHAS photometry with sources in the UKIDSS Galactic Plane Survey that validates the existing calibration of the best data.
TeV Gamma-Ray Survey of the Northern Hemisphere Sky Using the Milagro Observatory
Milagro是一个水切伦科夫广泛的空气簇射阵列，在TeV能量带连续监测整个头顶天空。提供了对$\sim$ 3年数据（2000年12月至2003年11月）的分析结果。这些数据已被搜索的稳定点源的TeV伽马射线之间的1.1度和80度的倾角。发现了两个来源，蟹状星云和活动星系Mrk 421。对于北半球的其余部分，我们设定95% C. L。对于5度和70度之间的源倾角，高于1 TeV的上限在275和600 mCrab之间（4.8-10.5 $\times 10^{-12}$ cm $^{-2}$ s $^{-1}$）。由于Milagro的灵敏度取决于大气顶部的源的光谱，因此给出了候选源的光谱上的限制的依赖性。由于来自河外源的高能γ射线通过与河外背景光的相互作用而被吸收，因此给出了通量极限对候选源红移的依赖关系。这里提出的上限是一个数量级更严格的比以前公布的限制TeV伽马射线全天巡天。
