The SCUBA HAlf Degree Extragalactic Survey (SHADES) – V. Submillimetre properties of near-infrared-selected galaxies in the Subaru/XMM–Newton deep field     

T. Takagi  A. M. J. Mortier  K. Shimasaku  K. Coppin  A. Pope  R. J. Ivison  H. Hanami  S. Serjeant  D. L. Clements  R. S. Priddey  J. S. Dunlop  T. Takata  I. Aretxaga  S. C. Chapman  S. A. Eales  D. Farrah  G. L. Granato  M. Halpern  D. H. Hughes  E. van Kampen  D. Scott  K. Sekiguchi  I. Smail  M. Vaccari 《Monthly notices of the Royal Astronomical Society》2007,381(3):1154-1168

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Radio imaging of the Subaru/XMM–Newton Deep Field – I. The 100-μJy catalogue, optical identifications, and the nature of the faint radio source population     

Chris Simpson  Alejo Martínez-Sansigre  Steve Rawlings  Rob Ivison  Masayuki Akiyama  Kazuhiro Sekiguchi  Tadafumi Takata  Yoshihiro Ueda  Mike Watson 《Monthly notices of the Royal Astronomical Society》2006,372(2):741-757

We describe deep radio imaging at 1.4 GHz of the 1.3-deg² Subaru/ XMM–Newton Deep Field (SXDF), made with the Very Large Array in B and C configurations. We present a radio map of the entire field, and a catalogue of 505 sources covering 0.8 deg² to a peak flux density limit of 100 μJy. Robust optical identifications are provided for 90 per cent of the sources, and suggested identifications are presented for all but 14 (of which seven are optically blank, and seven are close to bright contaminating objects). We show that the optical properties of the radio sources do not change with flux density, suggesting that active galactic nuclei (AGN) continue to contribute significantly at faint flux densities. We test this assertion by cross-correlating our radio catalogue with the X-ray source catalogue and conclude that radio-quiet AGN become a significant population at flux densities below 300 μJy, and may dominate the population responsible for the flattening of the radio source counts if a significant fraction of them are Compton-thick.  相似文献   

On the fissions of a solid body under influence of tidal force; with application to the problem of twin craters on the moon     

Sekiguchi  N. 《Earth, Moon, and Planets》1970,1(4):429-439

The internal strain due to the tidal force in the proximity of a tide-generating body (in the present case, the Moon) is calculated according to the Lord Kelvin theory of Earth tides. The conditions for which uniform elastic sphere possessing a definite tensile strength is crushed near the surface of the Moon is investigated. The state of internal stress is almost independent of the value of elastic constants. Many lunar features, such as twin craters, craterous walled plains of irregular forms, compound craters, may be explained by fission of the meteoritic material before impact.  相似文献   

On the possible amplitudes of the moon's free libration     

N. Sekiguchi 《Earth, Moon, and Planets》1970,2(1):78-93

The relations between probable amplitude of the Moon's free libration and its exciting action are obtained using a theory of the stochastic process. Among the three modes of the free libration, the one in longitude is most prominent if the exciting effect is isotropic. If the excitations are caused by crater-producing meteoritic impacts, it is very probable that the free librations in longitude exist whose semi-amplitude exceeds 1.  相似文献   

Rocket observations of atomic oxygen density and airglow emission rate in the WAVE2000 campaign     

N. Iwagami  T. Shibaki  T. Suzuki  H. Sekiguchi  N. Takegawa  W. H. Morrow 《Journal of Atmospheric and Solar》2003,65(16-18):1349-1360

Atomic oxygen density and airglow volume emission rate profiles measured in the rocket experiment S-310-29 carried out as a part of the Waves in Airglow Structures Experiment over Kagoshima in 2000 (WAVE2000) campaign are presented, and the excitation processes of the atomic oxygen 557.7 nm line and the molecular oxygen atmospheric band airglow emissions are discussed. The volume emission rate profiles calculated from the measured atomic oxygen densities using the methods and parameters proposed by the ETON campaign (EATON model) are found to well represent the shapes of measured twin-peak emission rate profiles seen during this campaign suggesting that the EATON model is valid for a perturbed atmosphere. There is some discrepancy in the modeled absolute values for the emissions. Applying the model to the current O density measurements results in predicted emission rates that are a factor of 3.2 and 1.5 too high for the 557.7 nm line and Atmospheric band, respectively. This suggests either that the atomic oxygen densities of the present campaign are too large by a factor of 1.2 (=1.5^1/2) to 1.5 (=3.2^1/3), or that those of the ETON campaign were too small by the same factor or that the combined errors in both campaigns can account for the discrepancy (the modeled volume emission rates of the 557.7 nm line and atmospheric band are roughly in proportion to [O]³ and [O]², respectively). Our present data findings do not favor the 2-step more than the 1-step excitation process for the atmospheric band because a calculation of the quantum efficiency based on the observed O density does not show a steep gradient around 100 km.  相似文献   

Hierarchical traveltime tomography     

Shoji Sekiguchi 《Geophysical Journal International》2006,166(3):1105-1124

A new traveltime tomographic method was developed with hierarchical shape functions of the finite element method as slowness or velocity interpolation functions. The degree of the approximation of velocity modelling is adjusted by selecting a set of hierarchical shape functions in each element. The ray density parameter of each element controls the selection to make the approximation fine or coarse in the high- or low-ray-density area. The proposed method is applied to both synthetic traveltime data and actual data. The AIC is used to determine the number of model parameters. The result of the synthetic data shows that low-resolution model parameters can be eliminated by the ray density parameter. The result of the actual data shows that the velocity pattern is approximately the same in the fine approximation area and that the velocity fluctuation is suppressed in the coarse approximation area, compared with that obtained from a full set of hierarchical shape functions. The number of model parameters is drastically reduced. The resolution can be estimated by the checkerboard restoration test. The result of the real data set was compared with that of the linear velocity grid model.  相似文献   

The rupture process of the M_J=7.2 1995 Hyogo‐ken Nanbu (Kobe) earthquake deduced from S‐wave polarization analysis     

M.&#;P. Bouin  M. Cocco  G. Cultrera  H. Sekiguchi  K. Irikura 《Geophysical Journal International》2000,143(3):521-544

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Third UN/ESA/NASA Workshop on the International Heliophysical Year 2007 and Basic Space Science     

M. Kitamura  K. Sekiguchi  K. Yumoto  H. J. Haubold 《Earth, Moon, and Planets》2009,104(1-4):141-159

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Geomorphological maps for Japanese volcanoes by Geographical Survey Institute, Japan     

Mamoru Koarai  Masaharu Tsuzawa  Yohta Kumaki  Tatsuo Sekiguchi 《GeoJournal》1996,38(3):329-337

Geographical Survey Institute is going to produce Land condition maps of volcano about active volcanoes given the priority by the Geodesy Council. This paper introduces these land condition maps of volcano and other geomorphological maps for the research of volcanic disaster, especially the research of debris avalanche on Bandai Volcano.  相似文献   

Amplitude distribution of seismic waves for laterally heterogeneous structures including a subducting slab   总被引：1，自引：0，他引：1  

Shoji Sekiguchi 《Geophysical Journal International》1992,111(3):448-464

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