Flux calibration of the AAO/UKST superCOSMOS Hα survey
Flux calibration of the AAO/UKST superCOSMOS Hα survey
复制标题
AAO/UKST superCOSMOS Hα 调查的通量校准
DOI：
10.1093/mnras/stt1986
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发表时间：
2013
影响因子：
4.8
通讯作者：
Warren A. Reid
中科院分区：
文献类型：
--
作者：
D. Frew;I. Bojičić;I. Bojičić;Quentin A. Parker;Quentin A. Parker;M. Pierce;M. Pierce;M. Gunawardhana;Warren A. Reid
AAO/UKST SuperCOSMOS Hα巡天（SHS）于2003年完成，是对现有广域巡天的有力补充。它在狭窄的成像波段内具有面积覆盖、空间分辨率和灵敏度，至今仍是天文学界的优秀资源。这233个独立的领域以数字形式在线提供，每个领域覆盖25平方度。SHS一直是北方同等调查的动力，新的数字Hα调查现在开始在南方进行，如VPHAS+。它是许多重要发现项目的基础，Macquarie/AAO/斯特拉斯堡Hα行星状星云项目就是一个特别成功的例子。然而，SHS的全部潜力受到了阻碍，缺乏一个明确的路线，可接受的通量校准的基础摄影数据。我们确定了170个SHS观测场的定标因子，并提出了一条直接测量SHS观测艾德分辨星云的积分Hα通量和表面亮度的途径。我们还包括一个从SHS测量的>100个行星状星云和其他星云的积分Hα通量的目录，并使用这些数据来显示通量，精确到± 0.10 - 0.14 dex（-25-35%），可以从这些领域获得。对于其余的63个场，可以使用12.0计数pix 1 R 1的平均校准因子，从而可以确定准确度优于±0.2 dex（-50%）的合理综合通量。我们概述了所涉及的程序和注意事项，需要在实现这样的通量测量赞赏。这篇论文形成了一个方便的参考来源，将显着增加SHS的科学效用。
The AAO/UKST SuperCOSMOS Hα Survey (SHS) was, when completed in 2003, a powerful addition to extant wide-field surveys. The combination o f areal coverage, spatial resolution and sensitivity in a narrow imaging band, still marks it out t oday as an excellent resource for the astronomical community. The 233 separate fields are avai lable online in digital form, with each field covering 25 square degrees. The SHS has been th e motivation for equivalent surveys in the north, and new digital Hα surveys now beginning in the south such as VPHAS+. It has been the foundation of many important discovery projects with the Macquarie/AAO/Strasbourg Hα planetary nebula project being a particularly successful e xample. However, the full potential of the SHS has been hampered by lack of a clear route to acceptable flux calibration from the base photographic data. We have det ermined the calibration factors for 170 individual SHS fields, and present a direct pathway to the measurement of integrated Hα fluxes and surface brightnesses for resolved nebulae detect ed in the SHS. We also include a catalogue of integrated Hα fluxes for >100 planetary and other nebulae measured from the SHS, and use these data to show that fluxes, accurate to ± 0.10 ‐ 0.14 dex (�25‐35 per cent), can be obtained from these fields. For the remaining 63 fields, a mean calibration factor of 12.0 counts pix 1 R 1 can be used, allowing the determination of reasonable integrated fluxes accurate to better than ±0.2 dex (�50 per cent). We outline the procedures involved and the caveats that need to be appreciated in achieving such flux measurements. This paper forms a handy reference source that will significantly incre ase the scientific utility of the SHS.