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arXiv 1306.1217astro-ph.IM
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Herschel-SPIRE光度计的通量标定

Flux calibration of the Herschel-SPIRE photometer

G. J. Bendo, M. J. Griffin, J. J. Bock, L. Conversi, C. D. Dowell, T. Lim, N. Lu, C. E. North, A. Papageorgiou, C. P. Pearson, M. Pohlen, E. T. Polehampton, B. … 展开作者

G. J. Bendo, M. J. Griffin, J. J. Bock, L. Conversi, C. D. Dowell, T. Lim, N. Lu, C. E. North, A. Papageorgiou, C. P. Pearson, M. Pohlen, E. T. Polehampton, B. Schulz, D. L. Shupe, B. Sibthorpe, L. D. Spencer, B. M. Swinyard, I. Valtchanov, C. K. Xu

摘要:

本文介绍了赫歇尔空间天文台光谱和光度成像接收器(SPIRE)中三波段亚毫米级光度计的流量校准过程。这包括描述校准方案的方程、使用海王星作为主要校准源的理由、用于推导通量校准参数的观测和数据处理程序的描述- 对于每个阵列中的每个测辐射热计(用于从电压转换为通量密度),分析各个测辐射热计的通量校准中的误差预算,以及对初级和次级校准器观测的通量校准试验。导出通量校准参数的过程分为两个部分。在第一部分中,我们使用天文源的观测结合光度计内部校准源的操作来导出通量校准曲线的未标度导数。为了以Jy/beam/V为单位缩放校准曲线,我们然后使用海王星的观测,其中每个测辐射热计的光束是使用在非常精细的扫描模式中观察到的海王星绘制的。对于大多数测辐射热计,单个测辐射热计的通量校准的总仪器不确定度约为0.5%,尽管由于海王星观测的问题,少数测辐射热计的不确定度约为1-5%。基于应用程序的通量校准参数海王星观测使用典型的扫描地图观测模式,我们确定,从每个阵列作为一个整体的测量仪器的不确定性为1.5%。这大大低于与海王星模型相关的绝对校准不确定性,估计为4%。

英文摘要:

We describe the procedure used to flux calibrate the three-band submillimetre photometer in the Spectral and Photometric Imaging REceiver (SPIRE) instrument on the Herschel Space Observatory. This includes the equations describing the calibration scheme, a justification for using Neptune as the primary calibration source, a description of the observations and data processing procedures used to derive flux calibration parameters (for converting from voltage to flux density) for every bolometer in each array, an analysis of the error budget in the flux calibration for the individual bolometers, and tests of the flux calibration on observations of primary and secondary calibrators. The procedure for deriving the flux calibration parameters is divided into two parts. In the first part, we use observations of astronomical sources in conjunction with the operation of the photometer internal calibration source to derive the unscaled derivatives of the flux calibration curves. To scale the calibration curves in Jy/beam/V, we then use observations of Neptune in which the beam of each bolometer is mapped using Neptune observed in a very fine scan pattern. The total instrumental uncertainties in the flux calibration for the individual bolometers is ~0.5% for most bolometers, although a few bolometers have uncertainties of ~1-5% because of issues with the Neptune observations. Based on application of the flux calibration parameters to Neptune observations performed using typical scan map observing modes, we determined that measurements from each array as a whole have instrumental uncertainties of 1.5%. This is considerably less than the absolute calibration uncertainty associated with the model of Neptune, which is estimated at 4%.

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