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arXiv 2202.03306astro-ph.IM
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James Webb Space Telescope II上的近红外光谱仪(NIRSpec)。多对象spectroscopy(MOS)

The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope II. Multi-object spectroscopy (MOS)

P. Ferruit, P. Jakobsen, G. Giardino, T. Rawle, C. Alves de Oliveira, S. Arribas, T. L. Beck, S. Birkmann, T. Böker, A. J. Bunker, S. Charlot, G. de Marchi, M. … 展开作者

P. Ferruit, P. Jakobsen, G. Giardino, T. Rawle, C. Alves de Oliveira, S. Arribas, T. L. Beck, S. Birkmann, T. Böker, A. J. Bunker, S. Charlot, G. de Marchi, M. Franx, A. Henry, D. Karakla, S. A. Kassin, N. Kumari, M. López-Caniego, N. Lützgendorf, R. Maiolino, E. Manjavacas, A. Marston, S. H. Moseley, J. Muzerolle, N. Pirzkal, B. Rauscher, H. W. Rix, E. Sabbi, M. Sirianni, M. te Plate, J. Valenti, C. J. Willott, P. Zeidler

摘要:

我们提供了一个概述的能力和性能的近红外光谱仪(NIRSpec)的詹姆斯韦伯太空望远镜(JWST)时,在其多目标光谱(MOS)模式采用一种新型的微快门阵列(MSA)狭缝设备。MSA由四个独立的98弧秒$\times$ 91弧秒象限组成,每个象限包含$365\times171$可单独寻址的快门,其在天空上的开放面积在0.27弧秒$\times$ 0.53弧秒的间距上测量为0.20弧秒$\times$ 0.46弧秒。这是第一次在太空任务中使用可配置的多目标光谱仪。与NIRSpec MOS模式实现的多路复用的水平进行了量化,我们表明,NIRSpec将能够观察到通常50至200个对象同时与模式的近四分之一的百万快门提供的MSA。这种模式是固定的和定期的,我们确定的具体限制,它产生的NIRSpec观测规划。我们还介绍了NIRSpec MOS数据的数据处理和校准步骤。在仪器覆盖的0.6-5.3 $μ$ m的大波长范围内,大多数衍射受限的仪器点扩散函数的大小的显著变化,以及用MSA观察到的大多数目标不能期望在其各自的狭缝内完美居中的事实,使得所获得的光谱的分光光度计和波长校准特别复杂。尽管存在这些挑战,但NIRSpec在MOS模式下的灵敏度和多路复用能力是前所未有的,应该能够在解决广泛的突出天体物理问题方面取得重大进展。

英文摘要:

We provide an overview of the capabilities and performance of the Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope (JWST) when used in its multi-object spectroscopy (MOS) mode employing a novel Micro Shutter Array (MSA) slit device. The MSA consists of four separate 98 arcsec $\times$ 91 arcsec quadrants each containing $365\times171$ individually addressable shutters whose open areas on the sky measure 0.20 arcsec $\times$ 0.46 arcsec on a 0.27 arcsec $\times$ 0.53 arcsec pitch. This is the first time that a configurable multi-object spectrograph has been available on a space mission. The levels of multiplexing achievable with NIRSpec MOS mode are quantified and we show that NIRSpec will be able to observe typically fifty to two hundred objects simultaneously with the pattern of close to a quarter of a million shutters provided by the MSA. This pattern is fixed and regular, and we identify the specific constraints that it yields for NIRSpec observation planning. We also present the data processing and calibration steps planned for the NIRSpec MOS data. The significant variation in size of the mostly diffraction-limited instrument point spread function over the large wavelength range of 0.6-5.3 $μ$m covered by the instrument, combined with the fact that most targets observed with the MSA cannot be expected to be perfectly centred within their respective slits, makes the spectrophotometric and wavelength calibration of the obtained spectra particularly complex. These challenges notwithstanding, the sensitivity and multiplexing capabilities anticipated of NIRSpec in MOS mode are unprecedented, and should enable significant progress to be made in addressing a wide range of outstanding astrophysical problems.

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