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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >FIELD: Automated emission line detection software for Subaru/FMOS near-infrared spectroscopy
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FIELD: Automated emission line detection software for Subaru/FMOS near-infrared spectroscopy

机译：领域：用于斯巴鲁/ FMOS近红外光谱的自动发射线检测软件

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We describe the development of automated emission line detection software for the Fiber Multi-Object Spectrograph (FMOS), which is a near-infrared spectrograph fed by 400 fibers from the 0.2 deg(2) prime focus field of view of the Subaru Telescope. The software, FIELD (FMOS software for Image-based Emission Line Detection), is developed and tested mainly for the FastSound survey, which is targeting Ha emitting galaxies at z similar to 1.3 to measure the redshift space distortion as a test of general relativity beyond z similar to 1. The basic algorithm is to calculate the line signal-to-noise ratio (S/N) along the wavelength direction, given by a 2D convolution of the spectral image and a detection kernel representing a typical emission line profile. A unique feature of FMOS is its use of OH airglow suppression masks, requiring the use of flat-field images to suppress noise around the mask regions. Bad pixels on the detectors and pixels affected by cosmic rays are efficiently removed using the information obtained from the FMOS analysis pipeline. We limit the range of acceptable line-shape parameters for the detected candidates to further improve the reliability of line detection. The final performance of line detection is tested using a subset of the FastSound data; the false detection rate of spurious objects is examined by using inverted frames obtained by exchanging object and sky frames. The false detection rate is < 1% at S/N > 5, allowing an efficient and objective emission line search for FMOS data at the line flux level of greater than or similar to 1.0 x 10(-16) erg cm(-2) s(-1).
机译：我们描述了用于光纤多目标光谱仪（FMOS）的自动发射线检测软件的开发，该软件是从Subaru望远镜的0.2 deg（2）主焦点视野中由400根光纤馈入的近红外光谱仪。该软件名为FIELD（基于图像的发射线检测的FMOS软件），主要针对FastSound测量开发和测试，该测量针对z处与1.3相似的Ha发射星系，以测量红移空间畸变，作为对广义相对论的测试， z类似于1。基本算法是计算沿波长方向的线信噪比（S / N），该值由光谱图像的2D卷积和代表典型发射线轮廓的检测内核给出。 FMOS的独特功能是使用OH气辉抑制掩模，要求使用平场图像来抑制掩模区域周围的噪声。使用从FMOS分析管道获得的信息，可以有效地去除探测器上的不良像素和受宇宙射线影响的像素。我们限制了检测到的候选线形参数的范围，以进一步提高线检测的可靠性。使用FastSound数据的子集测试线路检测的最终性能。通过使用通过交换天体和天框获得的倒帧来检查虚假对象的错误检测率。在S / N> 5时，错误检测率<1％，从而可以在大于或类似于1.0 x 10（-16）erg cm（-2）的线通量水平下高效，客观地搜索FMOS数据s（-1）。

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