Search Publications
Infrequent Occurrence of Significant Linear Polarization in Hα Solar Flares
Hanaoka, Yoichiro; Kawate, Tomoko
We performed statistical and event studies of linear polarization in the Hα line during solar flares. The statistical study revealed that, among 71 Hα flares analyzed, including 64 GOES flares, only one event shows significant linear polarization signals. Such an infrequent occurrence of significant linear polarization in solar flares is consisten…
Characteristics of SEP Events and Their Solar Origin During the Evolution of Active Region NOAA 10069
Myagkova, I. N.; Kashapova, L. K.; Miteva, R. +1 more
We present the results of a comparative analysis of the properties of a series of successive solar flares, which occurred in active region (AR) 10069 in August 2002, and the associated solar energetic particle (SEP) events. The active region was extremely flare productive during its evolution. The solar flare characteristics are based on X-ray and…
Deep late-time observations of the supernova impostors SN 1954J and SN 1961V
Kochanek, C. S.; Adams, S. M.; Patton, Rachel A.
SN 1954J in NGC 2403 and SN 1961V in NGC 1058 were two luminous transients whose definitive classification as either non-terminal eruptions or supernovae remains elusive. A critical question is whether a surviving star can be significantly obscured by dust formed from material ejected during the transient. We use three lines of argument to show th…
Spatial and Genetic Relationships of Groove Belts, Rift Zones, and Lobate Plains on Venus
Guseva, E. N.
Relationships of two types of extensional zones formed on the surface of Venus in different periods of geologic history—older groove belts and younger rift zones—have been analyzed. Rift zones are less abundant by area than groove belts on the surface of Venus. They are systematically more extensive than groove belts and characterized by contrast …
A Dual Black Hole Associated with Obscured and Unobscured AGNs: CXO J101527.2+625911
Kim, D. -C.; Momjian, E.; Kim, Minjin +6 more
We report the results of an investigation to determine the nature of the offset active galactic nucleus (AGN) found in the source CXO J101527.2+625911. Hubble Space Telescope and Chandra X-ray observatory data have suggested that the offset AGN, which has an angular separation of only 0.″26 from the center of the host galaxy, is a recoiled superma…
Radiometric calibration of the SIMBIO-SYS STereo imaging Channel
Cremonese, G.; Da Deppo, V.; Naletto, G. +11 more
The STereo imaging Channel (STC) is a double wide-angle camera developed to be one of the channels of the SIMBIO-SYS instrument onboard of the ESA BepiColombo mission to Mercury. STC main goal is to map in 3D the whole Mercury surface. The geometric and radiometric responses of the STC Proto Flight model have been characterized on-ground during th…
The Y SZ,Planck - Y SZ,XMM scaling relation and its difference between cool-core and non-cool-core clusters
Zhao, Hai-Hui; Jia, Shu-Mei; Chen, Yong +3 more
We construct a sample of 70 clusters using data from XMM-Newton and Planck to investigate the Y SZ,Planck - Y SZ,XMM scaling relation and the cool-core influences on this relation. Y SZ,XMM is calculated by accurately de-projected temperature and electron number density profiles derived from XMM-Newton. Y S…
The SCUBA-2 Cluster Snapshot Survey - I. Catalogue of lensed galaxies and submillimetre-bright central galaxies
Egami, Eiichi; Geach, James E.; Chapman, Scott C. +6 more
The SCUBA-2 Cluster Snapshot Survey (S2CSS) observed 202 rich clusters of galaxies at 850 µm in relatively poor submillimetre observing conditions (\tau _{{ 225 GHz}}> 0.1) with the aim of identifying rare examples of bright (tens of mJy) gravitationally lensed submillimetre galaxies. The S2CSS covered over 0.33 deg2 to an aver…
Spectroscopic Investigations of Galactic Clusters with Associated Cepheid Variables. III. Collinder 394 and BB SGR
Kniazev, A. Yu.; Miroshnichenko, A. S.; Mishenina, T. V. +4 more
We present the results of a spectroscopic and photometric investigation of 20 objects from the open cluster Collinder 394, which contains the Cepheid BB Sgr. Besides the Cepheid, we studied tree K-giants, four B-giants, and twelve B-A-F main sequence stars. Radial velocities (RV), v sin i, Teff, log g, were determined using spectroscopi…
Identification of the SMART-1 spacecraft impact location on the Moon
Stooke, P. J.
The impact site of the European Space Agency SMART-1 lunar orbiter was identified in Lunar Reconnaissance Orbiter (LRO) Camera (LROC) images. No pre-impact image of adequate resolution is available for confirmation, but the form of the impact feature and its ejecta, its proximity to the expected location and the absence of any other obvious candid…