Search Publications
Is the infrared background excess explained by the isotropic zodiacal light from the outer solar system?
Tsumura, Kohji
This paper investigates whether an isotropic zodiacal light from the outer solar system can account for the detected background excess in the near-infrared. Assuming that interplanetary dust particles are distributed in a thin spherical shell at the outer solar system (>200 au), thermal emission from such cold (<30 K) dust in the shell has a…
Radio and infrared study of southern H II regions G346.056-0.021 and G346.077-0.056
Vig, S.; Ghosh, S. K.; Liu, T. +3 more
Aim. We present a multiwavelength study of two southern Galactic H II regions G346.056-0.021 and G346.077-0.056 which are located at a distance of 10.9 kpc. The distribution of ionized gas, cold and warm dust, and the stellar population associated with the two H II regions are studied in detail using measurements at near-infrared, mid-infrared, fa…
Magnetotail Configuration During a Steady Convection Event as Observed by Low-Altitude and Magnetospheric Spacecraft
Sergeev, V. A.; Tsyganenko, N. A.; Angelopoulos, V. +2 more
Motivated by ongoing discussion regarding the magnetic configuration in the near-Earth and midtail regions and its role in populating the inner magnetosphere during long-duration steady magnetospheric convection (SMC) events, we analyze a rich collection of observations during 10 hr of strong, steady solar wind driving. Auroral boundaries and regi…
Determination of the coma dust back-scattering of 67P for phase angles from 1.2° to 75°
Fink, Uwe; Doose, Lyn
A phase curve is derived for the dust coma of comet 67P/Churyumov-Gerasimenko (67P) from 1.2° to 74° using images from the OSIRIS camera system on board the Rosetta mission during the period 2014 July 25 to 2015 February 23 as the spacecraft approached the comet. We analyzed 123 images of the continuum filter at 612.6 nm and 60 images of the 375 n…
Saturn’s gravitational field induced by its equatorially antisymmetric zonal winds
Anderson, John D.; Schubert, Gerald; Kong, Dali +1 more
The cloud-level zonal winds of Saturn are marked by a substantial equatorially antisymmetric component with a speed of about 50ms-1 which, if they are sufficiently deep, can produce measurable odd zonal gravitational coefficients ΔJ 2k+1, k = 1, 2, 3, 4. This study, based on solutions of the thermal-gravitational wind equatio…
A Check on the Validity of Magnetic Field Reconstructions
Wheatland, M. S.; Gilchrist, S. A.; Mastrano, A.
We investigate a method to test whether a numerically computed model coronal magnetic field B departs from the divergence-free condition (also known as the solenoidality condition). The test requires a potential field B0 to be calculated, subject to Neumann boundary conditions, given by the normal components of the model field B at the …
Suzaku observations of low surface brightness cluster Abell 1631
Matsumoto, Hironori; Mitsuishi, Ikuyuki; Ota, Naomi +5 more
We present analysis results for a nearby galaxy cluster Abell 1631 at z = 0.046 using the X-ray observatory Suzaku. This cluster is categorized as a low X-ray surface brightness cluster. To study the dynamical state of the cluster, we conduct four-pointed Suzaku observations and investigate physical properties of the Mpc-scale hot gas associated w…
Improving catalogue matching by supplementing astrometry with additional photometric information
Wilson, Tom J.; Naylor, Tim
The matching of sources between photometric catalogues can lead to cases where objects of differing brightness are incorrectly assumed to be detections of the same source. The rejection of unphysical matches can be achieved through the inclusion of information about the sources' magnitudes. The method described here uses the additional photometric…
On the influence of the local maxima of total pressure on the current sheet stability to the kink-like (flapping) mode
Korovinskiy, D. B.; Semenov, V. S.; Erkaev, N. V. +3 more
The stability of the Fadeev-like current sheet with respect to transversally propagating kink-like perturbations (flapping mode) is considered in terms of two-dimensional linear magnetohydrodynamic numerical simulations. It is found that the current sheet is stable when the total pressure minimum is located in the sheet center and unstable when th…
High entropy and evidence for a merger in the low surface brightness cluster Abell 2399
Mitsuishi, Ikuyuki; Ota, Naomi; Babazaki, Yasunori +4 more
We present results of the X-ray analyses of the nearby cluster of galaxies Abell 2399 (z = 0.058) using the XMM-Newton and Suzaku satellites. This cluster is classified as a low surface brightness (LSB) cluster. It has a bimodal structure in X-rays, and the X-ray-emission peaks are significantly offset from the peaks in gas temperature. By de-proj…