Search Publications
Characterizing motion types of G-band bright points in the quiet Sun
Feng, Song; Wang, Feng; Deng, Hui +4 more
We study the motion of G-band bright points (GBPs) in the quiet Sun to obtain the characteristics of different motion types. A high resolution image sequence taken with the Hinode/Solar Optical Telescope (SOT) is used, and GBPs are automatically tracked by segmenting 3D evolutional structures in a space-time cube. After putting the GBPs that do no…
Suzaku observation of Be/X-ray binary pulsar EXO 2030+375
Naik, Sachindra; Jaisawal, Gaurava K.
We study the timing and spectral properties of Be/X-ray binary pulsar EXO 2030+375 using a Suzaku observation taken on 2012 May 23, during a less intense Type I outburst. Pulsations were clearly detected in the X-ray light curves at a barycentric period of 41.2852 s, which suggest that the pulsar is spinning-up. The pulse profiles were found to be…
Photometric Calibration of the Lunar-based Ultraviolet Telescope for Its First Six Months of Operation on the Lunar Surface
Wang, Shen; Wang, Jing; Meng, Xian-Min +10 more
We describe the photometric calibration of the Lunar-based Ultraviolet Telescope (LUT), the first robotic astronomical telescope working on the lunar surface, for its first six months of operation on the lunar surface. Two spectral datasets (set A and B) from near-ultraviolet (NUV) to the optical band were constructed with 44 International Ultravi…
Morphology and structure of BzK-selected galaxies at z ∼ 2 in the CANDELS-COSMOS field
Kong, Xu; Chen, Yang; Fang, Guan-Wen +1 more
Utilizing a BzK-selection technique, we obtain 14550 star-forming galaxies (sBzKs) and 1763 passive galaxies (pBzKs) at z ∼ 2 from the K-selected (KAB < 22.5) catalog in the COSMOS/UltraVISTA field. The differential number counts of sBzKs and pBzKs are consistent with the results from the literature. Compared to the observed results,…
Propagating disturbances along fan-like coronal loops in an active region
Teriaca, Luca; Krishna Prasad, S.; Banerjee, Dipankar +2 more
Propagating disturbances are often observed in active region fan-like coronal loops. They were thought to be due to slow mode magnetohydrodynamic waves based on some of the observed properties. However, recent studies involving spectroscopy indicate that they could be due to high speed quasi-periodic upflows which are difficult to distinguish from…
Differential measurement of atmospheric refraction using a telescope with double fields of view
Zhao, Ming; Yu, Yong; Cao, Jian-Jun +2 more
For the sake of advancing theoretical research about atmospheric refraction, the atmospheric refraction observed at lower angles of elevation is still worth analyzing and exploring. In some engineering applications, objects with a larger zenith distance must sometimes be observed. Carrying out observational research on atmospheric refraction at lo…
Understanding the X-ray spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
Liu, Yuan; Guo, Yan-Jun; Tong, Hao +3 more
Hard X-rays above 10 keV are detected from several anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), and different models have been proposed to explain the physical origin within the frame of either a magnetar model or a fallback disk system. Using data from Suzaku and INTEGRAL, we study the soft and hard X-ray spectra of four AX…
High resolution deep imaging of a bright radio quiet QSO at z ~ 3
Tanaka, Ichi; Yamada, Toru; Iye, Masanori +3 more
We have obtained deep J and Ks-band images centered on a bright radio quiet QSO UM 402 (zem = 2.856) using the IRCS camera and adaptive optics systems that are part of the Subaru Telescope, as well as retrieved WFC3/F140W archive images of this object. A faint galaxy (mk = 23.32±0.05 in the Vega magnitude system) that lies ~ …
Galactic coordinate system based on multi-wavelength catalogs
Zhu, Zi; Liu, Jia-Cheng; Ding, Ping-Jie
The currently used Galactic coordinate system (GalCS) is based on the FK5 system at J2000.0, which was transformed from the FK4 system at B1950.0. The limitations and misunderstandings related to this transformed GalCS can be avoided by defining a new GalCS that is directly connected to the International Celestial Reference System (ICRS). With mor…
Morphology and structure of extremely red objects at z ∼ 1 in the CANDELS-COSMOS field
Kong, Xu; Chen, Yang; Fang, Guan-Wen +1 more
Using high-resolution HST/Wide Field Camera 3 F125W imaging from the CANDELS-COSMOS field, we report the structural and morphological properties of extremely red objects (EROs) at z ∼ 1. Based on the UVJ color criteria, we separate EROs into two types: old passive galaxies (OGs) and dusty star-forming galaxies (DGs). For a given stellar mass, we f…