Search Publications
Probing the sign-changeable interaction between dark energy and dark matter with current observations
Zhang, Jing-Fei; Zhang, Xin; Li, Yun-He +2 more
We consider the models of vacuum energy interacting with cold dark matter in this study, in which the coupling can change sigh during the cosmological evolution. We parameterize the running coupling b by the form b(a) = b0a+be(1‑a), where at the early-time the coupling is given by a constant be and today the coupli…
Reconstruction of constant slow-roll inflation
Gao, Qing
Using the relations between the slow-roll parameters and the power spectra for the single field slow-roll inflation, we derive the scalar spectral tilt n s and the tensor to scalar ratio r for the constant slow-roll inflation, and obtain the constraint on the slow-roll parameter η from the Planck 2015 results. The inflationary potenti…
Impact of the latest measurement of Hubble constant on constraining inflation models
Zhang, Xin
We investigate how the constraint results of inflation models are affected by considering the latest local measurement of $H_0$ in the global fit. We use the observational data, including the Planck CMB full data, the BICEP2 and Keck Array CMB B-mode data, the BAO data, and the latest measurement of Hubble constant, to constrain the $\Lambda$CDM+$…
Cosmological implications of different baryon acoustic oscillation data
Li, Miao; Wang, Shuang; Hu, YaZhou
In this work, we explore the cosmological implications of different baryon acoustic oscillation (BAO) data, including the BAO data extracted by using the spherically averaged one-dimensional galaxy clustering (GC) statistics (hereafter BAO1) and the BAO data obtained by using the anisotropic two-dimensional GC statistics (hereafter BAO2). To make …
Lunar absolute reflectance as observed by Chang'E-1 Imaging Interferometer
Li, Bo; Zhang, Jiang; Ling, ZongCheng +3 more
Lunar absolute reflectance, which describes the fraction of solar radiation reflected by the Moon, is fundamental for the Chang'E-1 Imaging Interferometer (IIM) to map lunar mineralogical and elemental distributions. Recent observations made by the Spectral Irradiance Monitor (SIM) onboard the Solar Radiation and Climate Experiment (SORCE) spacecr…
Working models for the gravitational field of Phobos
Shi, Xian; Willner, Konrad; Oberst, Jürgen +2 more
Models for the gravitational field of Mars moon Phobos were developed using the latest shape model and assuming homogeneous density distribution. Three methods were applied in our study. Comparisons were made between these methods and all were shown to yield consistent results. Notably, the most accurate shape model of Phobos to date, complete up …
H α counterparts of X-ray bright points in the solar atmosphere
Zhang, Ping; Fang, Cheng; Zhang, QingMin
X-ray bright points (XBPs) are small-scale brightenings in the solar corona. Their counterparts in the lower atmosphere, however, are poorly investigated. In this paper, we study the counterparts of XBPs in the upper chromosphere where the Hα line center is formed. The XBPs were observed by the X-ray Telescope (XRT) aboard the Hinode spacecraft du…
Martian ionogram scaling by the Object Tracking Method
Ping, JinSong; Wang, MingYuan
The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) onboard the Mars Express (MEX) spacecraft started to collect data of the Martian topside ionosphere from May, 2005. By now a large amount of ionograms has been obtained. It is important to extract vertical ionospheric information effectively from the ionograms for further stud…
Implementation of the Earth-based planetary radio occultation inversion technique
Ping, JinSong; Zhang, SuJun; Han, TingTing +2 more
The planetary radio occultation technique is one of the earliest suggested and achieved methods to detect the planetary atmosphere, and has been conducted by almost every deep space planetary probe. The principles, modules, inversion results and primary analysis of the SHAO Planetary Occultation observation Processing system (SPOPs) are presented …
Spatial distribution of metal emissions in supernova remnant 3C 397 viewed with Chandra and XMM
Chen, Yang; Jiang, Bing
We present X-ray equivalent width imaging of 3C 397 for Mg Heα, Si Heα, S Heα, and Fe Kα complex lines with Chandra and XMM-Newton observations. The images revealed that the heavier the element is, the smaller the extent of the element distribution is. The Mg emission is evidently enhanced in the southeastern blow-out region, well along the radio …