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Matsuura, Shuji,Arai, Toshiaki,Bock, James J.,Cooray, Asantha,Korngut, Phillip M.,Kim, Min Gyu,Lee, Hyung Mok,Lee, Dae Hee,Levenson, Louis R.,Matsumoto, Toshio,Onishi, Yosuke,Shirahata, Mai,Tsumura, K American Astronomical Society 2017 The Astrophysical journal Vol.839 No.1
<P>The extragalactic background light (EBL) captures the total integrated emission from stars and galaxies throughout the cosmic history. The amplitude of the near-infrared EBL from space absolute photometry observations has been controversial and depends strongly on the modeling and subtraction of the zodiacal light (ZL) foreground. We report the first measurement of the diffuse background spectrum at 0.8-1.7 mu m from the CIBER experiment. The observations were obtained with an absolute spectrometer over two flights in multiple sky fields to enable the subtraction of ZL, stars, terrestrial emission, and diffuse Galactic light. After subtracting foregrounds and accounting for systematic errors, we find the nominal EBL brightness, assuming the Kelsall ZL model, is 42.7(-10.6) (+11.9) nW m(-2) sr(-1) at 1.4 mu m. We also analyzed the data using the Wright ZL model, which results in a worse statistical fit to the data and an unphysical EBL, falling below the known background light from galaxies at. lambda<. 1.3 mu m. Using a model-independent analysis based on the minimum EBL brightness, we find an EBL brightness of 28.7(-3.3)(+5.1) nWm(-2) s(r-1) at 1.4 mu m. While the derived EBL amplitude strongly depends on the ZL model, we find that we cannot fit the spectral data to ZL, Galactic emission, and EBL from solely integrated galactic light from galaxy counts. The results require a new diffuse component, such as an additional foreground or an excess EBL with a redder spectrum than that of ZL.</P>
<i>Spitzer</i> Observations of the North Ecliptic Pole
Nayyeri, H.,Ghotbi, N.,Cooray, A.,Bock, J.,Clements, D. L.,Im, M.,Kim, M. G.,Korngut, P.,Lanz, A.,Lee, H. M.,Lee, D. H.,Malkan, M.,Matsuhara, H.,Matsumoto, T.,Matsuura, S.,Nam, U. W.,Pearson, C.,Serje American Astronomical Society 2018 The Astrophysical journal Supplement series Vol.234 No.2
<P>We present a photometric catalog for Spitzer Space Telescope warm mission observations of the North Ecliptic Pole (NEP; centered at R.A. = 18(h)00(m)00(s), decl. = 66(d)33(m)38(s).552). The observations are conducted with IRAC in the 3.6 and 4.5 mu m bands over an area of 7.04 deg(2), reaching 1 sigma depths of 1.29 mu Jy and 0.79 mu Jy in the 3.6 mu m and 4.5 mu m bands, respectively. The photometric catalog contains 380,858 sources with 3.6 and 4.5 mu m band photometry over the full-depth NEP mosaic. Point-source completeness simulations show that the catalog is 80% complete down to 19.7 AB. The accompanying catalog can be used for constraining the physical properties of extragalactic objects, studying the AGN population, measuring the infrared colors of stellar objects, and studying the extragalactic infrared background light.</P>
On the flutter Characteristics of separated two box girders
M. Matsumoto,R. Shijo,A. Eguchi,T. Hikida,H. Tamaki,K. Mizuno 한국풍공학회 2004 Wind and Structures, An International Journal (WAS Vol.7 No.4
The flutter characteristics of long span bridges are discussed from the point of the unsteady pressure distribution on bridge deck surface during heaving/torsional vibration related to the aerodynamic derivatives. In particular, it is explained that the coupling terms, which consist of A1* and H3*, play a substantial role on the coupled flutter, in comparison with the flutter characteristics of various structural sections. Also the effect of the torsional/heaving frequency ratio of bridge structures on the flutter instability is discussed from the point of the coupling effect between heaving and torsional vibrations.
Numerical Prediction of Cavitating Flow inside Nozzle Hole Based on Cavitation Bubble Dynamics
( Matsumoto M. ),( Kobashi Y. ),( Matsumura E. ),( Senda J. ),( Fujimoto H. ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
In direct injection engines, fuel spray atomization is very important factor for the formation of fuel/air mixture, which influences on the engine performance and exhaust emissions of engine out. Especially, cavitation bubbles breaking out inside the nozzle hole have the significant role for spray atomization process. The purpose of this research is to make the effect of the cavitation on the fuel spray atomization clearly. The numerical model based on the bubble dynamics was proposed in this report, where the behavior of cavitation bubbles is treated as a function of pressure inside the nozzle hole. The prediction of bubble behavior under various conditions in the case of a single bubble was carried out by use of pressure distributions estimated through the experimental results. Primary, the processes of bubble growth and its shrinkage were calculated for each test fuel at given injection pressure. Secondary, the behavior of cavitation bubble was simulated for various initial bubble radiuses. As results of these calculations, although the position of bubble collapsing inside the nozzle hole does not coincide with experimental results, this proposed model predicts quantitatively the temporal change in bubble radius for each case.
AKARI OBSERVATION OF THE FLUCTUATION OF THE NEAR-INFRARED BACKGROUND
Matsumoto, T.,Seo, H.J.,Jeong, W.S.,Lee, H.M.,Matsuura, S.,Matsuhara, H.,Oyabu, S.,Pyo, J.,Wada, T. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We report a search for fluctuations of the sky brightness toward the North Ecliptic Pole with AKARI, at 2.4, 3.2, and $4.1{\mu}m$. The stacked images with a diameter of 10 arcminutes of the AKARI-Monitor Field show a spatial structure on the scale of a few hundred arcseconds. A power spectrum analysis shows that there is a significant excess fluctuation at angular scales larger than 100 arcseconds that cannot be explained by zodiacal light, diffuse Galactic light, shot noise of faint galaxies, or clustering of low-redshift galaxies. These findings indicate that the detected fluctuation could be attributed to the first stars of the universe, i.e., Population III stars.
REANALYSIS OF THE NEAR-INFRARED EXTRAGALACTIC BACKGROUND LIGHT BASED ON THE<i>IRTS</i>OBSERVATIONS
Matsumoto, T.,Kim, M. G.,Pyo, J.,Tsumura, K. IOP Publishing 2015 The Astrophysical journal Vol.807 No.1
<P>We reanalyze data of the near-infrared background taken by IRTS using up-to-date observational results of zodiacal light (ZL), integrated star light, and diffuse Galactic light. We confirm the existence of residual isotropic emission, which is slightly lower but almost the same as previously reported. At wavelengths longer than 2 mu m, the result is fairly consistent with the recent observation with AKARI. We also perform the same analysis using a different ZL model by Wright and detect residual isotropic emission that is slightly lower than that based on the original Kelsall model. Both models show residual isotropic emission that is significantly brighter than the integrated light of galaxies.</P>
PRIMARY BLACK HOLE SPIN IN OJ 287 AS DETERMINED BY THE GENERAL RELATIVITY CENTENARY FLARE
Valtonen, M. J.,Zola, S.,Ciprini, S.,Gopakumar, A.,Matsumoto, K.,Sadakane, K.,Kidger, M.,Gazeas, K.,Nilsson, K.,Berdyugin, A.,Piirola, V.,Jermak, H.,Baliyan, K. S.,Alicavus, F.,Boyd, D.,Torrent, M. Ca American Astronomical Society 2016 ASTROPHYSICAL JOURNAL LETTERS - Vol.819 No.2
<P>OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in a binary black hole model. The model predicted a major optical outburst in 2015 December. We found that the outburst did occur within the expected time range, peaking on 2015 December 5 at magnitude 12.9 in the optical R-band. Based on Swift/XRT satellite measurements and optical polarization data, we find that it included a major thermal component. Its timing provides an accurate estimate for the spin of the primary black hole, chi = 0.313 +/- 0.01. The present outburst also confirms the established general relativistic properties of the system such as the loss of orbital energy to gravitational radiation at the 2% accuracy level, and it opens up the possibility of testing the black hole no-hair theorem with 10% accuracy during the present decade.</P>
THE <i>COSMIC INFRARED BACKGROUND EXPERIMENT</i> ( <i>CIBER</i> ): THE NARROW-BAND SPECTROMETER
Korngut, P. M.,Renbarger, T.,Arai, T.,Battle, J.,Bock, J.,Brown, S. W.,Cooray, A.,Hristov, V.,Keating, B.,Kim, M. G.,Lanz, A.,Lee, D. H.,Levenson, L. R.,Lykke, K. R.,Mason, P.,Matsumoto, T.,Matsuura, IOP Publishing 2013 The Astrophysical journal, Supplement series Vol.207 No.2