Search Publications
A new method to determine the gravity field of small bodies from line-of-sight acceleration data
Barriot, Jean-Pierre; Rodriguez, J. Alexis P.; Yan, Jian-Guo +2 more
We present a new method to derive line-of-sight acceleration observables from spacecraft radio tracking data. The observables can be used to estimate the mass and gravity of a natural satellite as a spacecraft flyby. The corresponding observation model adapts to one-way and two/three-way tracking modes. As a test case for method validation and app…
CCD astrometric observations of 2017 VR12, Camillo and Midas
Su, Jie; Wang, Jian-Cheng; Zhang, Yi-Gong +2 more
We have observed three near-Earth objects (NEOs), 2017 VR12, Camillo and Midas, during 2018. The observations were made with the 1-m telescope, operated by Yunnan Observatories, over two nights. Their precise astrometric positions are derived from 989 CCD observations. The theoretical positions of asteroids are retrieved from the Jet Propulsion La…
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…
Variable binaries and variables in binaries in the Binary star DataBase
Malkov, Oleg; Kovaleva, Dana; Kaygorodov, Pavel
The Binary star DataBase (BDB, http://bdb.inasan.ru) combines data from catalogs of binary and multiple stars of all observational types. There is a number of ways for variable stars to form or to be a part of binary or multiple systems. We describe how such stars are represented in the database.
A multiwavelength view of a classical T Tauri star CV Cha
Karmakar, Subhajeet; Sharma, Saurabh; Joshi, Arti +3 more
Using long-term optical, ultraviolet (UV) and X-ray data, we present a study of a classical T Tauri star CV Cha. The V -band light curve obtained from the All Sky Automated Survey (ASAS) shows short as well as long-term variability. The short-term variability could be due to rotational modulation of CV Cha. We derive the rotational period of 3.714…
On the weak Lyα emission line of BL Lacertae objects
Bu, Jia; Ma, Ren-Yi; Fang, Tao-Tao +2 more
Recent studies reveal that weak Lyα emission line may be a ubiquitous feature of nearby BL Laceratae objects (BL Lacs). We present a survey of the Lyα emission lines in BL Lacs, with a focus on data obtained by the Cosmic Origins Spectrograph onboard the Hubble Space Telescope. Among the 11 selected targets, seven show a clear detection of the int…
Intra-day variability of three Seyfert galaxies measured with XMM-Newton
Tripathi, Ashutosh; Gu, Min-Feng; Liao, Mai +2 more
We present and analyze the variability of three Seyfert galaxies on intra-day timescales. We have analyzed in a uniform manner the 38 longest (>30 ks) observations made for NGC 4051, MCG-06-30-15 and NGC 4151 by XMM-Newton between 2000 and 2015. The nuclei were quite active during essentially all of these observations and the overall X-ray flux…
Decomposing the host galaxy from high-z QSOs using principal component analysis
Wang, Yi-Ping; He, Wei
High resolution deep imaging from space and adaptive optics techniques with large ground-based facilities have enabled studies examining faint host galaxies of high redshift quasi-stellar objects (QSOs). However, the related image processing techniques, especially for a precise point-spread function (PSF) reconstruction and characterization of the…