Search Publications
Galaxy formation in the reionization epoch as hinted by Wide Field Camera 3 observations of the Hubble Ultra Deep Field
Hathi, Nimish P.; McCarthy, Patrick J.; Ryan, Russell E. +4 more
We present a large sample of candidate galaxies at z approx 7-10, selected in the Hubble Ultra Deep Field using the new observations of the Wide Field Camera 3 that was recently installed on the Hubble Space Telescope. Our sample is composed of 20 z850-dropouts (four new discoveries), 15 Y105-dropouts (nine new discoveries) a…
Quasi-periodic outflows observed by the X-Ray Telescope onboard Hinode in the boundary of an active region
Tian, Hui; Guo, Li-Jia; He, Jian-Sen
Persistent outflows have recently been detected at the boundaries of some active regions. Although these outflows are suggested to be possible sources of the slow solar wind, the nature of these outflows is poorly understood. Through an analysis of an image sequence obtained by the X-Ray Telescope onboard the Hinode spacecraft, we found that quasi…
Mars geodesy, rotation and gravity
Dehant, Veronique; Rosenblatt, Pascal
This review provides explanations of how geodesy, rotation and gravity can be addressed using radioscience data of an orbiter around a planet or of the lander on its surface. The planet Mars is the center of the discussion. The information one can get from orbitography and radioscience in general concerns the global static gravitational field, the…
Statistical study of EUV and X-ray transient brightenings
Li, Hui; Li, Jing-Wei
Using the visual inspection and base difference method and data from the X-ray Telescope (XRT) onboard Hinode and TRACE with improved spatial and temporal resolution, we selected 48 X-ray transient brightenings (XTBs) and 237 EUV transient brightenings (ETBs) to study the connection between these two types of transient brightenings (TBs). These ET…
XMM-Newton observations of H2O maser galaxy NGC 7479
Wang, Jin; Zhang, Jiang-Shui; Fan, Jun-Hui
The XMM-Newton observations of H2O megamaser galaxy NGC 7479 are presented. Its smoothed X-ray image clearly shows spiral morphology, which matches well with its optical asymmetric spiral structure. One prominent source can be found at the tip of its northern spiral arm, which is much brighter than its nuclear X-ray source (about a 50% …
Infrared spectral evolution of carbon stars
Chen, Pei-Sheng; Shan, Hong-Guang; Yang, Xiao-Hong
We collected almost all Highly Processed Data Products (HPDP) of ISO SWS01 spectra for the Galactic visual carbon stars, infrared carbon stars, extreme carbon stars and carbon-rich proto-planetary nebulae (PPNs). Those infrared spectra are primarily analyzed and discussed. It is shown that either spectral shapes/peaks, or main molecular/dust featu…
Geology of Mars after the first 40 years of exploration
van Gasselt, Stephan; Pio Rossi, Angelo
The knowledge of Martian geology has increased enormously in the last 40 yr. Several missions orbiting or roving Mars have revolutionized our understanding of its evolution and geological features, which in several ways are similar to Earth, but are extremely different in many respects. The impressive dichotomy between the two Martian hemispheres …
Variations in the X-ray eclipse transitions of Cen X-3
Paul, Biswajit; Devasia, Jincy; James, Marykutty +1 more
We report here an investigation of the X-ray eclipse transitions of the high mass X-ray binary pulsar Cen X-3 in different intensity states. The long term light curve of Cen X-3 obtained with RXTE-ASM spanning more than 5000d shows strong aperiodic flux variations with low and high states. We have investigated the eclipse transitions of Cen X-3 in…
Multifrequency emission analysis of TeV blazars H 2356-309 and 1ES 1218+304
Zhang, Li; Tang, Yun-Yong; Dai, Zu-Cheng
The multiband nonthermal emissions in radio, X-ray, and very high-energy (VHE) γ-ray bands from two distant blazars, H 2356-309 and 1ES 1218+304, have been detected, and, especially from recent observations with the Suzaku, MAGIC and VERITAS telescopes, clearly reveal nonthermal power-law spectra. We study the broadband nonthermal spectra of the t…
An empirical method to correct the saturation seen in the SOHO/MDI magnetograms
Liu, Yang; Zhao, Yong-Heng; Zhendong Gao, George
The magnetic field of the umbrae is sometimes found to be saturated in the magnetograms taken by the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observatory (SOHO). It is suggested that the combination of the low intensity of sunspot umbrae and the limitation of the 15-bit onboard numerical data acquisition leads to this satu…