Search Publications
Long term optical variability of bright X-ray point sources in elliptical galaxies
Shalima, P.; Jithesh, V.; Jeena, K. +3 more
We present long term optical variability studies of bright X-ray sources in four nearby elliptical galaxies with the Chandra Advanced CCD Imaging Spectrometer array (ACIS-S) and observations from the Hubble Space Telescope (HST) Advanced Camera for Surveys. Out of the 46 bright (X-ray counts > 60) sources that are in the common field of view of…
Far-Infrared and submillimeter properties of SDSS galaxies in the Herschel ATLAS science demonstration phase field
Wu, Hong; Zhu, Yi-Nan; Zhou, Zhi-Min +1 more
Using the Herschel ATLAS science demonstration phase data cross-identified with SDSS DR7 spectra, we select 297 galaxies with F250µm > 5σ. The sample galaxies are classified into five morphological types, and more than 40% of the galaxies are peculiar/compact galaxies. The peculiar galaxies show higher far-infrared/submillimete…
A multi-wavelength study of the gravitational lens COSMOS J095930+023427
Paolillo, Maurizio; Cao, Shuo; Zhu, Zong-Hong +1 more
We present a multi-wavelength study of the gravitational lens COSMOS J095930+023427 (z1 = 0.892), together with the associated galaxy group along the line of sight located at z ~ 0.7, and the lensed background galaxy. The source redshift is currently unknown, but estimated to be at zs ~ 2. This analysis is based on publicly a…
Gravitationally lensed extended sources: the case of QSO RXJ0911
Diep, Pham Ngoc; Nhung, Pham Tuyet; Hoai, Do Thi +6 more
After a brief reminder of the mechanism of gravitational lensing of extended sources, the particular case of the host galaxy of QSO RXJ0911, a high redshift (z ~ 2.8) quadruply imaged quasar, is explored. The non linearity of the problem, together with the proximity of the source to a cusp of the lens inner caustic, has important consequences on t…
Sequential clustering of star formations in IC 1396
Li, Jin-Zeng; Huang, Ya-Fang
We present a comprehensive study of the H II region IC 1396 and its star forming activity, in which multi-wavelength data ranging from the optical to the near- and far-infrared were employed. The surface density distribution of all the 2MASS sources with a certain detection toward IC 1396 indicates the existence of a compact cluster spatially cons…
Solar-stellar astrophysics and dark matter
Turck-Chièze, Sylvaine; Lopes, Ilídio
In this review, we recall how stars contribute to the search for dark matter and the specific role of the Sun. We describe a more complete picture of the solar interior that emerges from neutrino detections, gravity and acoustic mode measurements of the Solar and Heliospheric Observatory (SOHO) satellite, becoming a reference for the most common s…
The LEGUE high latitude bright survey design for the LAMOST pilot survey
Xu, Yan; Lépine, Sébastien; Deng, Li-Cai +14 more
We describe the footprint and input catalog for bright nights in the LAMOST Pilot Survey, which began in October 2011. Targets are selected from two stripes in the north and south Galactic Cap regions, centered at δ = 29°, with 10° width in declination, covering right ascensions of 135° to 290° and -30° to 30° respectively. We selected spectroscop…
X-ray spectroscopy of clusters of galaxies
Ota, Naomi
Clusters of galaxies are the most massive objects in the Universe and precise knowledge of their mass structure is important to understand the history of structure formation and constrain still unknown types of dark contents of the Universe. X-ray spectroscopy of galaxy clusters provides rich information about the physical state of hot intracluste…
Application of a data-driven simulation method to the reconstruction of the coronal magnetic field
He, Han; Fan, Yu-Liang; Wang, Hua-Ning +1 more
Ever since the magnetohydrodynamic (MHD) method for extrapolation of the solar coronal magnetic field was first developed to study the dynamic evolution of twisted magnetic flux tubes, it has proven to be efficient in the reconstruction of the solar coronal magnetic field. A recent example is the so-called data-driven simulation method (DDSM), whi…
Interaction and eruption of two filaments observed by Hinode, SOHO, and STEREO
Li, Ying; Ding, Ming-De
We investigate the interaction between two filaments and the subsequent filament eruption event observed from different viewing angles by Hinode, the Solar and Heliospheric Observatory, and the Solar Terrestrial Relations Observatory. In the event, the two filaments rose high, interacted with each other, and finally were ejected along two differen…