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15 papers · 1 filter
On the Galactic Disk Metallicity Distribution from Open Clusters I. New Catalogues and Abundance Gradient
L. Chen, J. L. Hou, J. J. Wang
In this paper we have compiled two new open cluster catalogues. In the first one, there are 119 objects with ages, distances and metallicities available, while in the second one, 1…
The radiation properties of an accretion disk with a non-zero torque on its inner edge
Xinwu Cao, Y. D. Xu
The structure of the inner edge of the accretion disk around a black hole can be altered, if the matter inside the marginally stable orbit is magnetically connected to the disk. In…
Surface brightness measurements for APM galaxies
Z. Shao, S. J. Maddox, J. B. Jones +1
This paper considers some simple surface brightness (SB) estimates for galaxies in the Automated Plate Measuring Machine (APM) catalogue in order to derive homogeneous SB data for…
Pairwise velocity dispersion of galaxies at high redshift: theoretical predictions
D. H. Zhao, Y. P. Jing, G. Boerner
We investigate the feasibility of determining the pairwise velocity dispersion (PVD) for Lyman Break Galaxies (LBGs), and of using this quantity as a discriminator among theoretica…
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548
B. M. Peterson, the International AGN Watch
We present the final installment of an intensive 13-year study of variations of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy NGC 5548. The data base…
Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys
Y. P. Jing
We use a large set of state-of-the-art cosmological N-body simulations [512^3 particles] to study the intrinsic ellipticity correlation functions of halos. With the simulations of…