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arXiv 1306.1778astro-ph.IM
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宽波段远红外和亚毫米测光仪器的通量校准:理论和对Herschel-SPIRE的应用

Flux Calibration of Broadband Far Infrared and Submillimetre Photometric Instruments: Theory and Application to Herschel-SPIRE

M. J. Griffin, C. E. North, B. Schulz, A. Amaral-Rogers, G. Bendo, J. Bock, L. Conversi, A. Conley, C. D. Dowell, M. Ferlet, J. Glenn, T. Lim, C. Pearson, M. Po… 展开作者

M. J. Griffin, C. E. North, B. Schulz, A. Amaral-Rogers, G. Bendo, J. Bock, L. Conversi, A. Conley, C. D. Dowell, M. Ferlet, J. Glenn, T. Lim, C. Pearson, M. Pohlen, B. Sibthorpe, L. Spencer, B. Swinyard, I. Valtchanov

摘要:

在远红外至毫米波长下工作的光度测量仪器通常具有宽光谱通带(中心波长/带宽~ 3或更小),尤其是在空间工作的光度测量仪器。宽的通带可以导致跨通带的光束轮廓和孔径效率的显著变化,到目前为止,在这种仪器的通量校准中通常还没有考虑到这些影响。由于与主要校准标准的亮度相关的绝对校准不确定性现在在5%或更小的范围内,通带上的光束特性的变化可以是扩展发射的整体校准精度的重要贡献者。我们提出了一个校准框架,考虑到这种变化的天线耦合和耦合焦平面架构。该方案包括点源和扩展源的情况下,也是一个半扩展源剖面的中间情况。我们将新方法应用于Herschel-SPIRE星载光度计。

英文摘要:

Photometric instruments operating at far infrared to millimetre wavelengths often have broad spectral passbands (central wavelength/bandwidth ~ 3 or less), especially those operating in space. A broad passband can result in significant variation of the beam profile and aperture efficiency across the passband, effects which thus far have not generally been taken into account in the flux calibration of such instruments. With absolute calibration uncertainties associated with the brightness of primary calibration standards now in the region of 5% or less, variation of the beam properties across the passband can be a significant contributor to the overall calibration accuracy for extended emission. We present a calibration framework which takes such variations into account for both antenna-coupled and absorber-coupled focal plane architectures. The scheme covers point source and extended source cases, and also the intermediate case of a semi-extended source profile. We apply the new method to the Herschel-SPIRE space-borne photometer.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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