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arXiv 1401.2045astro-ph.IM
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Herschel SPIRE傅里叶变换光谱仪的光源模式刻度

Herschel SPIRE Fourier Transform Spectrometer: Calibration of its Bright-source Mode

Nanyao Lu, Edward T. Polehampton, Bruce M. Swinyard, Dominique Benielli, Trevor Fulton, Rosalind Hopwood, Peter Imhof, Tanya Lim, Nicola Marchili, David A. Nayl… 展开作者

Nanyao Lu, Edward T. Polehampton, Bruce M. Swinyard, Dominique Benielli, Trevor Fulton, Rosalind Hopwood, Peter Imhof, Tanya Lim, Nicola Marchili, David A. Naylor, Bernhard Schulz, Sunil Sidher, Ivan Valtchanov

摘要:

欧空局赫歇尔空间天文台上光谱和光度成像接收器(SPIRE)的傅里叶变换光谱仪(FTS)有两种探测器设置模式:(a)标称模式,该模式最适合观测中等亮度至微弱的天文目标,(b)建议采用亮源模式,用于比500 Jy亮得多的光源,在446.7-1544 GHz(或波长为194-671微米)的SPIRE FTS带宽内,其采用降低的检测器响应度和异相模拟信号放大器/解调器。我们详细地解决了独特的亮源模式的校准问题,描述了集成的亮模式数据处理到现有的流水线的标称模式,并表明,亮源模式的通量校准精度一般是在2%的标称模式,和亮源模式是3至4倍的灵敏度低于标称模式。

英文摘要:

The Fourier Transform Spectrometer (FTS) of the Spectral and Photometric Imaging REceiver (SPIRE) on board the ESA Herschel Space Observatory has two detector setting modes: (a) a nominal mode, which is optimized for observing moderately bright to faint astronomical targets, and (b) a bright-source mode recommended for sources significantly brighter than 500 Jy, within the SPIRE FTS bandwidth of 446.7-1544 GHz (or 194-671 microns in wavelength), which employs a reduced detector responsivity and out-of-phase analog signal amplifier/demodulator. We address in detail the calibration issues unique to the bright-source mode, describe the integration of the bright-mode data processing into the existing pipeline for the nominal mode, and show that the flux calibration accuracy of the bright-source mode is generally within 2% of that of the nominal mode, and that the bright-source mode is 3 to 4 times less sensitive than the nominal mode.

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