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Naofumi Fujishiro,Hitoshi Hanami,Tsuyoshi Ishigaki 한국천문학회 2017 天文學論叢 Vol.32 No.1
We present physical properties of 24 μm galaxies detected by AKARI and Spitzer and their evolution between redshifts 0.4 < z < 2. Using multi-wavelength data from X-ray to radio observations in NEP Deep Field (for AKARI) and Subaru/XMM-Newton Deep Field (for Spitzer), we derive photometric redshift, stellar mass, star-formation rate (SFR), dust extinction magnitude and rest-frame luminosities/colors of the 24 μm galaxies from photometric SED fitting. We infer the SFRs from rest-frame ultraviolet luminosity and total infrared luminosity calibrated against Herschel photometric data. For both survey fields, we obtain complete samples with stellar mass of $>10^{10} M_\odot$ and SFR of $> 30 M_\odot/{\rm yr}$ up to z = 2. We find that specific SFRs evolves with redshift at all stellar masses in NON-power-law galaxies (non-PLGs) as star-formation dominant luminous infrared galaxies (LIRGs). The correlations between specific SFR and stellar mass in the Spitzer and AKARI galaxy samples are well consistent with trends of the main sequence galaxies. We also discuss nature of PLGs and their evolution.
WIDEBAND SPECTRAL DISPERSER MADE OF ZnS FOR EXOPLANET CHARACTERIZATION USING SPACE-BORNE TELESCOPES
Keigo Enya,Naofumi Fujishiro 한국천문학회 2017 天文學論叢 Vol.32 No.1
We present the developmentof a spectral dispersion devicefor wideband spectroscopy for which the primary scientificobjective is the characterization of transiting exoplanets. The principle of the disperser is simple: a grating isfabricated on the surface of a prism. The direction of the spectral dispersion power of the prismis crossed with the grating. Thus, the prism separates the spectrum into individualorders while the grating produces a spectrum for each order. In this work, ZnS was selected as the materialfor the cross disperser, which was designed to coverthe wavelength region, λ = 0.6 -13 μm,with a spectral resolving power, R ≥ 50. A disperser was fabricated, and an evaluationof its surface was conducted. Two spectrometer designs, one adopting ZnS(λ = 0.6 -13 μm, R ≥ 300)and the other adopting CdZnTe( λ = 1 -23 μm, R ≥ 250), are presented. The spectrometers, each of which has no moving mechanical parts,consist simply of a disperser, a focusing mirror, and a detector.
A COSMOLOGICAL PAH SURVEY WITH SPICA
Takehiko Wada,Eiichi Egami,Naofumi Fujishiro,Tomotsugu Goto,Masatoshi Imanishi,Hanae Inami,Daisuke Ishihara,Hidehiro Kaneda,Kotaro Kohno,Yusei Koyama,Hideo Matsuhara,Shuji Matsuura,Tohru Nagao,Youichi 한국천문학회 2017 天文學論叢 Vol.32 No.1
We propose a cosmological survey to probe star formation and nuclear activityin galaxies at redshifts of z = 2 - 4 by polycyclic aromatic hydrocarbon(PAH) features usingthe SPICA mid-infrared instrument (SMI)with a spectral resolution of R = 20. We will cover a wavelength range of 20-36 μmthat corresponds to z = 2 - 4 for the PAH features(11.3, 7.7, and 6.2 μm). The sensitivity will be $1\times10^{-19}$ W/m$^2$ (5 $\sigma$)in case of a referencesurvey that covers 4 arcmin$^2$ field in a one-hour observation. It corresponds to L$_{\rm IR}$=$2\times10^{11}$ $L_\odot$ at z=3and will give us more than 10000 galaxies in a 450 hour survey.