2019/05/14 by Kazuya Matsubayashi, Kouji Ohta, Fumihide Iwamuro +7 · 70 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Gamma-ray bursts and supernovae #Observatory #Optical fiber #Optics #Physics #Prime (order theory) #Pulsars and Gravitational Waves Research #Spectral line #Spectrograph #Telescope #astro-ph.IM
paper · pdf · doi:10.1093/pasj/psz087
published in Publications of the Astronomical Society of Japan 71(5) (Oxford University Press) · 18 pages, 13 figures, and 7 tables. Submitted to PASJ
arxiv created 2019/05/14 · openalex created_date 2019/05/29 · openalex publication_date 2019/07/24 · arxiv updated 2019/09/26 · openalex updated_date 2026/08/05
Abstract Observations of transient objects, such as short gamma-ray bursts and electromagnetic counterparts of gravitational wave sources, require prompt spectroscopy. To carry out prompt spectroscopy, we have developed an optical-fiber integral field unit (IFU) and connected it with an existing optical spectrograph, KOOLS. KOOLS–IFU was mounted on the Okayama Astrophysical Observatory 188 cm telescope. The fiber core and cladding diameters of the fiber bundle are 100 μm and 125 μm, respectively, and 127 fibers are hexagonally close-packed in the sleeve of the two-dimensional fiber array. We conducted test observations to measure the KOOLS–IFU performance and obtained the following conclusions: (1) the spatial sampling is 2′′.34 ± 0′′.05 per fiber, and the total field of view is 30′′.4 ± 0′′.65 with 127 fibers; (2) the observable wavelength and the spectral resolving power of the grisms of KOOLS are 4030–7310 Å and 400–600, 5020–8830 Å and 600–900, 4160–6000 Å and 1000–1200, and 6150–7930 Å and 1800–2400, respectively; and (3) the estimated limiting magnitude is 18.2–18.7 AB mag during 30 min exposure under optimal conditions.