Search Publications
Statistics of the field-aligned currents at the high-latitude energetic electron boundaries in the nightside: Cluster observation
Fu, S. Y.; Zong, Q. G.; Zhang, Hui +4 more
Magnetic field disturbances with a clear bipolar signature are frequently observed when the Cluster spacecraft fleet passes through both southern and northern high-latitude energetic electron boundaries at the nightside magnetosphere. The dominant variation of the bipolar signature is in the azimuthal direction of the local mean field-aligned coor…
Spectral Variations of the Sky: Constraints on Alternate Universes
Chary, R.
The fine tuning of parameters required to reproduce our present day universe suggests that our universe may simply be a region within an eternally inflating super-region. Many other regions beyond our observable universe would exist with each such region governed by a different set of physical parameters. Collision between these regions, if they o…
Thin energetic O+ layer embedded in the magnetotail reconnection current sheet observed by Cluster
Sun, W. J.; Fu, S. Y.; Zong, Q. G. +6 more
In the classical picture of the magnetotail current sheet, the current carriers are mainly ions that undergo nonadiabatic motions. Oxygen ions could contribute a thicker current sheet than the protons due to their large gyroradii. In this paper, however, we report a thin energetic O+ layer embedded in the magnetotail proton current shee…
A spiral galaxy's mass distribution uncovered through lensing and dynamics
van de Ven, Glenn; Dutton, Aaron A.; Trick, Wilma H.
We investigate the matter distribution of a spiral galaxy with a counter-rotating stellar core, SDSS J1331+3628 (J1331), independently with gravitational lensing and stellar dynamical modelling. By fitting a gravitational potential model to a quadruplet of lensing images around J1331's bulge, we tightly constrain the mass inside the Einstein radiu…
Origin of circular collapsed landforms in the Chryse region of Mars
Kleinhans, Maarten G.; Zegers, Tanja E.; Roda, Manuel +1 more
The quasi-circular collapsed landforms occurring in the Chryse region of Mars share similar morphological characteristics, such as depth of collapse and polygonally fractured floors. Here, we present a statistical analysis of diameter, maximum and minimum depth, and amount of collapse of these features. Based on their morphometric characteristics,…
The variable V381 Lac and its possible connection with the R CrB phenomenon
Dell'Agli, F.; Nesci, R.; Rossi, C. +2 more
We have performed new medium resolution spectroscopy, optical and near-infrared photometry to monitor the variability of the asymptotic giant branch (AGB) carbon star V 381 Lac. Our observations revealed rapid and deep changes in the spectrum and extreme variability in the optical and near-infrared bands. Most notably we observed the change of Na …
Research Developments in Li-Paczyński Novae (II): Observational Aspect
Wang, Shan-qin; Dai, Zi-gao; Wu, Xue-feng
Since the LP-Nova models were proposed, and the short gamma-ray burst (SGRB) afterglows were confirmed, people have actively made searches for the evidence of the existence of LP-Novae among the optical (or near-infrared) counterparts of SGRBs. In this paper, we first summarize these observational progresses before 2012 in Section 2. In Section 3 …
Modeling the spectral response for the soft X-ray imager onboard the ASTRO-H satellite
Uchida, Hiroyuki; Hayashida, Kiyoshi; Nakajima, Hiroshi +20 more
The ASTRO-H satellite is the 6th Japanese X-ray astronomical observatory to be launched in early 2016. The satellite carries four kinds of detectors, and one of them is an X-ray CCD camera, the soft X-ray imager (SXI), installed on the focal plane of an X-ray telescope. The SXI contains four CCD chips, each with an imaging area of 31 mm × 31 mm , …
Variation in the Width of Transition Region Network Boundaries
Raju, K. P.
The transition region network seen in solar extreme ultraviolet (EUV) lines is the extension of the chromospheric network. The network appears as an irregular web-like pattern over the solar surface outside active regions. The average width of transition region network boundaries is obtained from the two-dimensional autocorrelation function of SOl…
Searching for the HR 8799 Debris Disk with HST/STIS
Venn, K.; Matthews, B.; Lawler, S. +3 more
We present a new algorithm for space telescope high contrast imaging of close-to-face-on planetary disks called Optimized Spatially Filtered (OSFi) normalization. This algorithm is used on HR 8799 Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) coronagraphic archival data, showing an over-luminosity after reference star po…