Abstract It is shown that there exists a difference in the electron spin resonance spectrum of poly(methyl methacrylate) irradiated with electrons and observed at 77°K. and that at room temperature. One of the radicals trapped at 77°K. is probably ·COOCH 3 , which gives the spectrum of a single line, and the others giving triplet and quartet are perhaps ·CHO and ·CH 3 , the splitting of which are 132 gauss and 23 gauss, respectively. With the elevation of the annealing temperature the unstable radicals recombine or convert to the stable radicals; near room temperature they are completely replaced by the stable radical which gives the nine‐line spectrum.

10.1002/pol.1965.100030127

Cite

Citations (11)

The current status of prime focus instrument of Subaru prime focus spectrograph

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2016)

Shiang‐Yu Wang Mark A. Schwochert Pin-Jie Huang Hsin-Yo Chen Masahiko Kimura

The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiber spectrograph design for the prime focus of the 8.2m Subaru telescope. PFS will cover 1.3 degree diameter field with 2394 fibers to complement the imaging capability of Hyper SuprimeCam (HSC). The prime focus unit of PFS called Prime Focus Instrument (PFI) provides the interface with the top structure of Subaru telescope and also accommodates the optical bench in which Cobra fiber positioners are located. In addition, the acquisition and guiding cameras (AGCs), the optical fiber positioner system, the cable wrapper, the fiducial fibers, illuminator, and viewer, the field element, and the telemetry system are located inside the PFI. The mechanical structure of the PFI was designed with special care such that its deflections sufficiently match those of the HSC's Wide Field Corrector (WFC) so the fibers will stay on targets over the course of the observations within the required accuracy. In this report, the latest status of PFI development will be given including the performance of PFI components, the setup and performance of the integration and testing equipment.

Subaru Telescope

Field of view

10.1117/12.2232044

Cite

Citations (4)

Origin of Color Gradients in Elliptical Galaxies

Naoyuki Tamura

Source

Cite

Citations (0)

MOIRCS spectroscopy of BiK-selected galaxies at z 2

Subaru Proposal (2007)

Naoyuki Tamura

Source

Cite

Citations (0)

Prime Focus Spectrograph (PFS) for the Subaru telescope: a next-generation facility instrument of the Subaru telescope has started coming

Naoyuki Tamura Naruhisa Takato Yuki Moritani Kiyoto Yabe Yuki Ishizuka

PFS (Prime Focus Spectrograph), a next generation facility instrument on the Subaru telescope, is a very wide- field, massively multiplexed, and optical and near-infrared spectrograph. Exploiting the Subaru prime focus, 2394 reconfigurable fibers will be distributed in the 1.3 degree-diameter field of view. The spectrograph system has been designed with 3 arms of blue, red, and near-infrared cameras to simultaneously deliver spectra from 380nm to 1260nm in one exposure. The instrumentation has been conducted by the international collaboration managed by the project office hosted by Kavli IPMU. The team is actively integrating and testing the hardware and software of the subsystems some of which such as Metrology Camera System, the first Spectrograph Module, and the first on-telescope fiber cable have been delivered to the Subaru telescope observatory at the summit of Maunakea since 2018. The development is progressing in order to start on-sky engineering observation in 2021, and science operation in 2023. In parallel, the collaboration is trying to timely develop a plan of large-sky survey observation to be proposed and conducted in the framework of Subaru Strategic Program (SSP). This article gives an overview of the recent progress, current status and future perspectives of the instrumentation and scientific operation.

Subaru Telescope

First light

10.1117/12.2562206

Cite

Citations (1)

THE GAS INFLOW AND OUTFLOW RATE IN STAR-FORMING GALAXIES ATz∼ 1.4

The Astrophysical Journal (2014)

Kiyoto Yabe Kouji Ohta Masayuki Akiyama Fumihide Iwamuro Naoyuki Tamura

We try to constrain the gas inflow and outflow rate of star-forming galaxies at z ∼ 1.4 by employing a simple analytic model for the chemical evolution of galaxies. The sample is constructed based on a large near-infrared spectroscopic sample observed with Subaru/FMOS. The gas-phase metallicity is measured from the [N ii] λ6584/Hα emission line ratio and the gas mass is derived from the extinction corrected Hα luminosity by assuming the Kennicutt–Schmidt law. We constrain the inflow and outflow rate from the least-χ2 fittings of the observed gas-mass fraction, stellar mass, and metallicity with the analytic model. The joint χ2 fitting shows that the best-fit inflow rate is ∼1.8 and the outflow rate is ∼0.6 in units of star-formation rate. By applying the same analysis to the previous studies at z ∼ 0 and z ∼ 2.2, it is shown that both the inflow and outflow rates decrease with decreasing redshift, which implies the higher activity of gas flow process at higher redshift. The decreasing trend of the inflow rate from z ∼ 2.2 to z ∼ 0 agrees with that seen in previous observational works with different methods, though the absolute value is generally larger than in previous works. The outflow rate and its evolution from z ∼ 2.2 to z ∼ 0 obtained in this work agree well with the independent estimations in previous observational works.

Outflow

Inflow

Stellar mass

10.1088/0004-637x/798/1/45

Cite

Citations (30)

Prime focus instrument of prime focus spectrograph for Subaru telescope

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2014)

Shiang‐Yu Wang David Braun Mark A. Schwochert Pin-Jie Huang Masahiko Kimura

The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiber spectrograph design for the prime focus of the 8.2m Subaru telescope. PFS will cover 1.3 degree diameter field with 2394 fibers to complement the imaging capability of Hyper SuprimeCam (HSC). The prime focus unit of PFS called Prime Focus Instrument (PFI) provides the interface with the top structure of Subaru telescope and also accommodates the optical bench in which Cobra fiber positioners are located. In addition, the acquisition and guiding (AG) cameras, the optical fiber positioner system, the cable wrapper, the fiducial fibers, illuminator, and viewer, the field element, and the telemetry system are located inside the PFI. The mechanical structure of the PFI was designed with special care such that its deflections sufficiently match those of the HSC's Wide Field Corrector (WFC) so the fibers will stay on targets over the course of the observations within the required accuracy.

Subaru Telescope

10.1117/12.2057247

Cite

Citations (5)