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RISS 인기검색어
- 검색키워드
- 저자 : Takamitsu Miyaji (검색결과 3 건)
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AKARI INFRARED CAMERA OBSERVATIONS OF THE 3.3 μm PAH FEATURE IN Swift/BAT AGNs
Angel Castro,Takamitsu Miyaji,MAI SHIRAHATA,Kohei Ichikawa,SHINKI OYABU,David Clark,Masatoshi Imanishi,TAKAO NAKAGAWA,Yoshihiro Ueda 한국천문학회 2017 天文學論叢 Vol.32 No.1
Using the InfraRed Camera (IRC) on board the infrared astronomical satellite {\sl AKARI} we study the 3.3 $\mu$mpolycyclic aromatic hydrocarbon (PAH) feature and its connection to active galactic nucleus (AGN) propertiesfor a sample of 54 hard X-ray selected bright AGN, including both Seyfert 1 and Seyfert 2 type objects. The sample is selected from the 9-month {\sl Swift}/BAT survey in the 14--195 keV band and all of the sources have known neutralhydrogen column densities ($N_{\rm H}$). The 3.3 $\mu$m PAH luminosity ($L_{\rm 3.3{\mu}m}$) is used as a proxy for star-formation (SF)activity and hard X-ray luminosity ($L_{\rm 14-195keV}$) as an indicator of the AGN power. We explore for possible difference of SFactivity between type 1 (un-absorbed) and type 2 (absorbed) AGN. We use several statistical analyses taking the upper-limits of thePAH lines into account utilizing survival analysis methods. The results of our $\log(L_{\rm 14-195keV})$ versus $\log(L_{\rm 3.3{\mu}m})$regression shows a positive correlation and the slope for the type 1/unobscured AGN is steeper than that of type 2/obscured AGN at a$3\sigma$ level. Also our analysis shows that the circum-nuclear SF is more enhanced in type 2/absorbed AGN than type1/un-absorbed AGN for low $L_{\rm 14-195keV}$ luminosity/low Eddington ratio AGN, while there is no significant dependence of SF activityon the AGN type in the high $L_{\rm 14-195keV}$ luminosities/Eddington ratios.
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PROPERTIES OF DUST OBSCURED GALAXIES IN THE NEP-DEEP FIELD
Nagisa Oi,Hideo Matsuhara,CHRIS PEARSON,Veronique Buat,Denis Burgarella,Matt Malkan,Takamitsu Miyaji 한국천문학회 2017 天文學論叢 Vol.32 No.1
We selected 47 DOGs at z ~ 1.5 using optical $R$ (or $r^{'}$), AKARI 18 $\mu$m, and 24 $\mu$m color in the AKARI North Ecliptic Pole (NEP) Deep survey field. Using the colors among 3, 4, 7, and $9\mu$m, we classified them into 3 groups; bump DOGs (23 sources), power-law DOGs (16 sources), and unknown DOGs (8 sources). We built spectral energy distributions (SEDs) with optical to far-infrared photometric data and investigated their properties using SED fitting method. We found that AGN activity such as a AGN contribution to the infrared luminosity and a Chandra detection rate for bump and power-law DOGs are significantly different, while stellar component properties like a stellar mass and a star-formation rate are similar to each other. A specific star-formation rate range of power-law DOGs is slightly higher than that of bump DOGs with wide overlap. Herschel/PACS detection rates are almost the same between bump and power-law DOGs. On the other hand SPIRE detection rates show large differences between bump and power-law DOGs. These results might be explained by differences in dust temperatures. Both groups of DOGs host hot and/or warm dust (~ 50 Kelvin), and many bump DOGs contain cooler dust ($\hspace{0.3em}\raisebox{0.4ex}{$<$}\hspace{-0.75em}\raisebox{-.7ex}{$\sim$}\hspace{0.3em}$ 30 Kelvin).
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PROPERTIES OF THE SCUBA-2 850 μm SOURCES IN THE AKARI NEP-DEEP FIELD
서현종,정웅섭,김민진,김성진,고종완,표정현,김민규,Chris Pearson,Laia Barrufet,Maria del Carmen Campos Varillas,Hideo Matsuhara,Matt Malkan,Helen K. Kim,Toshinobu Takagi,Takamitsu Miyaji,Jorge Diaz Tello,Tomotsugu Goto,Nagi 한국천문학회 2018 Journal of The Korean Astronomical Society Vol.51 No.3
We carry out the study of SMGs in the $AKARI$ NEP-Deep field using James Clerk Maxwell Telescope (JCMT) SCUBA-2 850 $\mu$m source catalog released as a part of SCUBA-2 Cosmology Legacy Survey (S2CLS) program. The SCUBA-2 850 $\mu$m map has a root mean square (rms) noise of 1.2 mJy beam$^{-1}$ and covers an area of 0.60 degree$^{2}$. We find 4 sub-millimeter galaxies (SMGs) which have counterparts to $Herschel$ sources with spectroscopic redshifts in the literature. In addition, 3 dust obscured galaxies (DOGs) detected in $Herschel$ bands are also selected as a comparison sample. We derive IR luminosities of SMGs using CIGALE code, which are similar to those of high redshift SMGs from previous studies. The contribution of AGN to the total IR luminosity in SMG (2\%$-$11\%) is smaller than lower limit of that in DOG (19\%$-$35\%), which is consistent with the expectation from the evolutionary scenario of massive galaxies. We search for SMGs in the overdense region as candidates of protocluster and investigate 4 candidates among them including candidates around three DOGs. Finally, we argue that follow-up spectroscopic observation for the NEP-Deep field will provide crucial information to understand the role of SMGs in the evolution of massive galaxies.
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