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19932026
Showing 2007Show all

152 papers · 1 filter

astro-ph2007★ 30 cited

Determination of Topology Skeleton of Magnetic Fields in a Solar Active Region

Hui Zhao, Jing-Xiu Wang, Jun Zhang +2

The knowledge of magnetic topology is the key to understand magnetic energy release in astrophysics. Based on observed vector magnetograms, we have determined threedimensional (3D)…

astro-ph2007★ 85 cited

ASTROD and ASTROD I -- Overview and Progress

Wei-Tou Ni

In this paper, we present an overview of ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I mission concepts and studies. The missions employ deep-…

astro-ph2007★ 4 cited

Central engine afterglow of Gamma-ray Bursts

Yi-Zhong Fan, Tsvi Piran, Da-Ming Wei

Before 2004, nearly all GRB afterglow data could be understood in the context of the external shocks model. This situation has changed in the past two years, when it became clear t…

astro-ph2007★ 87 cited

Photometric Properties and Scaling Relations of Early Type Brightest Cluster Galaxies

F. S. Liu, X. Y. Xia, Shude Mao +2

We investigate the photometric properties of the early type Brightest Cluster Galaxies (BCGs) using a carefully selected sample of 85 BCGs from the C4 cluster catalogue with redshi…

astro-ph2007★ 64 cited

The effect of binaries on the dynamical mass determination of star clusters

M. B. N. Kouwenhoven, R. de Grijs

The total mass of distant star clusters is often derived from the virial theorem, using line-of-sight velocity dispersion measurements and half-light radii. Although most stars for…

astro-ph2007★ 12 cited

How many radio-loud quasars can be detected by the Gamma-Ray Large Area Space Telescope?

Xinwu Cao, J. M. Bai

In the unification scheme, radio quasars and FR II radio galaxies come from the same parent population, but viewed at different angles. Based on the Comptonization models for the g…

astro-ph2007★ 60 cited

From Equivalence Principles to Cosmology: Cosmic Polarization Rotation, CMB Observation, Neutrino Number Asymmetry, Lorentz Invariance and CPT

Wei-Tou Ni

In this paper, we review the approach leading to cosmic polarization rotation observation and present the current status with an outlook. In the study of the relations among equiva…

astro-ph2007★ 489 cited

A Holographic Dark Energy Model from Ricci Scalar Curvature

Changjun Gao, Fengquan Wu, Xuelei Chen +1

Motivated by the holographic principle, it has been suggested that the dark energy density may be inversely proportional to the area of the event horizon of the Universe. However,…

astro-ph2007★ 556 cited

The UKIDSS Galactic Plane Survey

P. W. Lucas, M. G. Hoare, A. Longmore +28

The UKIDSS Galactic Plane Survey (GPS) is one of the five near infrared Public Legacy Surveys that are being undertaken by the UKIDSS consortium, using the Wide Field Camera on the…

astro-ph2007★ 72 cited

Reddening, Colour and Metallicity of the M31 Globular Cluster System

Z. Fan, J. Ma, R. de Grijs +2

Using metallicities from the literature, combined with the Revised Bologna Catalogue of photometric data for M31 clusters and cluster candidates (the latter of which is the most co…

astro-ph2007★ 127 cited

Non-LTE line formation for heavy elements in four very metal-poor stars

L. Mashonkina, G. Zhao, T. Gehren +6

Stellar parameters and abundances of Na, Mg, Al, K, Ca, Sr, Ba, and Eu are determined for four very metal-poor stars (-2.66 < [Fe/H] < -2.15) based on non-LTE line formation and an…

astro-ph2007

SkyMouse: A smart interface for astronomical on-line resources and services

Chen-Zhou CUI, Hua-Ping SUN, Yong-Heng ZHAO +2

With the development of network and the World Wide Web (WWW), the Internet has been growing and changing dramatically. More and more on-line database systems and different kinds of…

astro-ph2007★ 8 cited

Worldwide R&D of Virtual Observatory

Chenzhou Cui, Yongheng Zhao

Virtual Observatory (VO) is a data intensive online astronomical research and education environment, taking advantages of advanced information technologies to achieve seamless and…

astro-ph2007★ 27 cited

Non-thermal emission from old supernova remnants

Jun Fang, Li Zhang

We study the non-thermal emission from old shell-type supernova remnants (SNRs) on the frame of a time-dependent model. In this model, the time-dependent non-thermal spectra of bot…

astro-ph2007★ 9 cited

Collisional interaction limits between dark matters and baryons in `cooling flow' clusters

Jian Hu, Yu-Qing Lou

Presuming weak collisional interactions to exchange the kinetic energy between dark matter and baryonic matter in a galaxy cluster, we re-examine the effectiveness of this process…

astro-ph2007

Open clusters: their kinematics and metellicities

L. Chen, J. L. Hou, J. L. Zhao +1

We review our work on Galactic open clusters in recent years, and introduce our proposed large program for the LOCS (LAMOST Open Cluster Survey). First, based on the most complete…

astro-ph2007★ 94 cited

IMAGES I. Strong evolution of galaxy kinematics since z=1

Y. Yang, H. Flores, F. Hammer +20

(abbreviated) We present the first results of the ESO large program, ``IMAGES'' which aims at obtaining robust measurements of the kinematics of distant galaxies using the multi-IF…

astro-ph2007★ 8 cited

Soft X-ray emissions of highly charged Si VII--Si XII in cool star--Procyon

G. Y. Liang, G. Zhao

Different observation data for cool star--Procyon (Obs\_IDs of 63, 1461 and 1224) available from {\it Chandra Data Public Archive} were co-added and analyzed. Emissivities of emiss…

astro-ph2007★ 14 cited

Simple Stellar Population Models as probed by the Large Magellanic Cloud Star Cluster ESO 121-SC03

Y. Xin, L. Deng, R. de Grijs +2

The presence of blue straggler stars (BSs) in star clusters has proven a challenge to conventional simple stellar population (SSP) models. Conventional SSP models are based on the…

astro-ph2007★ 29 cited

Self-Similar Dynamics of a Relativistically Hot Gas

Yu-Qing Lou, Yi Cao

In the presence of self-gravity, we investigate the self-similar dynamics of a relativistically hot gas with or without shocks in astrophysical processes of stellar core collapse,…

astro-ph2007★ 10 cited

Testing a new luminosity/redshift indicator for -ray bursts

Zhi-Bin Zhang, Guang-Zhong Xie

We have tested a relative spectral lag (RSL) method suggested earlier as a luminosity/redshift (or distance) estimator, using the generalized method by Schaefer & Collazzi. We find…

astro-ph2007★ 5 cited

Ly Leaks in the Absorption Spectra of High Redshift QSOs

Jiren Liu, Hongguang Bi, Li-Zhi Fang

Spectra of high redshift QSOs show deep Gunn-Peterson absorptions on the blue sides of the \Lya emissions lines. They can be decomposed into components called \Lya leaks, defined t…

hep-ph2007★ 6 cited

Phenomenological analysis of nucleon strangeness and meson-nucleon sigma terms

Feng Huang, Fu-Guang Cao, Bo-Qiang Ma

We calculate the nucleon strangeness in the chiral quark model and the meson cloud model. With the internal relation between the sigma term of () and , we…

astro-ph2007★ 59 cited

The Peculiar Type Ib Supernova 2006jc: A WCO Wolf-Rayet Star Explosion

N. Tominaga, M. Limongi, T. Suzuki +21

We present a theoretical model for Type Ib supernova (SN) 2006jc. We calculate the evolution of the progenitor star, hydrodynamics and nucleosynthesis of the SN explosion, and the…