Search Publications
Observational Evidence of Unwinding and Chirality Changing in Penumbral Filaments by Hinode
Zhang, Hongqi; Liu, Yu; Su, Jiangtao +3 more
In this paper, we present a very important and quite controversial observational property of penumbral filaments that may exhibit twisting motions and change their chirality. Using high-resolution observations from the Solar Optical Telescope on board Hinode, we study the unwinding and twisting motions in the penumbral filaments of active region N…
Study of the Intracluster and Intergalactic Medium in the Sculptor Supercluster with Suzaku
Kelley, Richard L.; Sato, Kosuke; Ohashi, Takaya +5 more
We studied the high-temperature plasma in the direction of the Sculptor supercluster at z = 0.108 with Suzaku. Suzaku carried out four observations in the supercluster: namely, A 2811, A 2811 offset, A 2804, A 2801 regions in 2005 November-December, including the regions beyond the virial radii of these clusters. The spectra taken in regions outsi…
Herschel observations in the ultracompact HII region Mon R2. Water in dense photon-dominated regions (PDRs)
Boulanger, F.; Martin, P. G.; France, K. +42 more
Context. Monoceros R2, at a distance of 830 pc, is the only ultracompact H ii region (UC H ii) where the photon-dominated region (PDR) between the ionized gas and the molecular cloud can be resolved with Herschel. Therefore, it is an excellent laboratory to study the chemistry in extreme PDRs (G0 > 105 in units of Habing f…
3D spectroscopy of local luminous compact blue galaxies: kinematics of NGC 7673
Castander, F. J.; Sánchez, S. F.; Pérez-Gallego, J. +7 more
The kinematic properties of the ionized gas of local luminous compact blue galaxy NGC 7673 are presented using three-dimensional data taken with the PPAK integral field unit at the 3.5-m telescope in the Centro Astronómico Hispano Alemán. Our data reveal an asymmetric rotating velocity field with a peak-to-peak difference of 60 kms-1. T…
An Analytic Parameterization of Self-Gravity Wakes in Saturn's Rings, with Application to Occultations and Propellers
Porco, Carolyn C.; Hedman, Matthew M.; Burns, Joseph A. +4 more
We have developed a semianalytic method of parameterizing N-body simulations of self-gravity wakes in Saturn's rings, describing their photometric properties by means of only six numbers: three optical depths and three weighting factors. These numbers are obtained by fitting a sum of three Gaussians to the results of a density-estimation procedure…
Ulysses Observations of the Properties of Multiple Ion Beams in the Solar Wind
Goldstein, B. E.; Neugebauer, M.; Zhou, X. -Y.
Properties of multiple ion beams in the solar wind beyond 1 AU as observed by the SWOOPS experiment on Ulysses are discussed. The solar wind proton distributions are approximated by a two beam bi-Maxwellian model. The slower outward traveling beam typically comprises the majority of the solar wind density. Differential streaming between the slower…
AKARI Near-infrared Spectroscopy of SDSS-selected Blue Early-type Galaxies
Matsuhara, Hideo; Lee, Myung Gyoon; Lee, Jong Chul +2 more
A near-infrared (NIR; 2.5-4.5 µm) spectroscopic survey of Sloan Digital Sky Survey (SDSS)-selected blue early-type galaxies (BEGs) has been conducted using the AKARI. The NIR spectra of 36 BEGs are secured, which are well balanced in their star formation (SF)/Seyfert/LINER-type composition. For high signal-to-noise ratio, we stack the BEG sp…
Measuring Dark Matter Ellipticity of A901/902 Using Particle-based Lensing
Heymans, Catherine; Goldberg, David M.; Morandi, Andrea +1 more
We present a non-parametric measure of the ellipticity and the alignment of the dark matter halos in the A901/902 supercluster. This supercluster is a system of four separate peaks in a 0fdg5 × 0fdg5 field of view. We map the mass distribution of each individual peak using an improved version of Particle-Based Lensing (PBL) and measure the ellipti…
Photometric variability of the Be star CoRoT-ID 102761769
Suárez, J. C.; Baglin, A.; Frémat, Y. +16 more
Context. Classical Be stars are rapid rotators of spectral type late O to early A and luminosity class V-III, which exhibit Balmer emission lines and often a near infrared excess originating in an equatorially concentrated circumstellar envelope, both produced by sporadic mass ejection episodes. The causes of the abnormal mass loss (the so-called …
Theory of the rotation of Janus and Epimetheus
Noyelles, Benoît
The saturnian coorbital satellites Janus and Epimetheus present a unique dynamical configuration in the Solar System, because of high-amplitude horseshoe orbits, due to a mass ratio of order unity. As a consequence, they swap their orbits every 4 years, while their orbital periods is about 0.695 days. Recently, Tiscareno et al. (Tiscareno, M.S., T…