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There are 11 papers published in subject: > since this site started. |
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1. How the shape of distance ratio in strong lensing systems affect cosmological constrains | |||
Yu Heng | |||
Astronomy 21 April 2017 | |||
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Abstract:The strong lensing events from galaxies and galaxy clusters are good cosmological probe. From these systems, the angular diameter distance ratio between the distance to the lensing source $D_{s}$ and that from an deflector to an source $D_{ds}$ can be derived observationally. They are thought as unbiased measurement and used to constrain different cosmological models. We find this ratio contain a priori assumption about the lensing events according to Bayesian statistics. So a fair estimation of the distribution of lensing events in the universe are necessary to make this method more reliable. | |||
TO cite this article:Yu Heng. How the shape of distance ratio in strong lensing systems affect cosmological constrains[OL].[21 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725228 |
2. Optical Substructure analysis of Galaxy Cluster Abell 2142 | |||
Yu Heng,Liu Ang | |||
Astronomy 18 April 2017 | |||
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Abstract:Galaxy cluster A2142 is a famous merging cluster. With X-ray telescope, its elongated morphology, sharp cold front, and in-falling group in the outskirt can be clearly seen. But without independent crosschecking method, its physical and dynamical properties are still hard to measure. We adopt the new hierarchical tree analysis method to explore its substructure with redshifts of its member galaxies. The substructures we find associate with its X-ray patterns very well. The complex dynamical status and the merging history of A2142 are revealed. | |||
TO cite this article:Yu Heng,Liu Ang. Optical Substructure analysis of Galaxy Cluster Abell 2142[OL].[18 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725594 |
3. A Candidate of Intrinsic Dusty Absorber with Metal-rich absorption system in the Quasar J1705+3543 | |||
Pan Xiang,Zhou Hongyan,Ge Jian,Jiang Peng,Yang Bin,Lu Honglin,Ji Tuo,Zhang Shaohua,Shi Xiheng | |||
Astronomy 24 May 2016 | |||
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Abstract:We present report an unusual damped lyaabsorption line system (DLA) towards the quasar SDSSJ170542.91+354340.2 at a redshift of 2. TheDLA is exceptional in that (1) its extinction curveis similar to peculiar Milky Way sightlines penetratingstar formation regions; (2) absorption components areredshifted at a speed range of up to 600 kms comparedto broad Balmer emission lines; (3) its gas-phase metallicityis super-solar and (4) evident residual flux isdetected in the DLA trough. This dusty DLA is best interpretedas a candidate of intrinsic quasar 2175~{AA} absorber, maybeassociated with star formation activities.Follow-up spectroscopies will helpto confirm the intrinsic nature and to explore dust grainsin the extreme environment proximate to the quasar. | |||
TO cite this article:Pan Xiang,Zhou Hongyan,Ge Jian, et al. A Candidate of Intrinsic Dusty Absorber with Metal-rich absorption system in the Quasar J1705+3543[OL].[24 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690425 |
4. Questioning the Doppler interpretation of cosmological red shifts | |||
Jian-Miin Liu | |||
Astronomy 21 April 2008 | |||
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Abstract:The Doppler interpretation of cosmological red shifts attributes these red shifts to only the relativistic Doppler effect of light coming from receding galaxies. We question this interpretation of cosmological red shifts. The Doppler interpretation of cosmological red shifts fails to catch the main cause of cosmological red shifts, namely the Universe’s evolution in the gravitational field of the Universe. This interpretation also fails to show the rationality of it as a theory. It contains an absurdity from the logical point of view, which makes us believe in that it must be misleading. | |||
TO cite this article:Jian-Miin Liu. Questioning the Doppler interpretation of cosmological red shifts[OL].[21 April 2008] http://en.paper.edu.cn/en_releasepaper/content/20672 |
5. A possible way to identify the fingerprint of the universe | |||
Deng Xiaoming | |||
Astronomy 21 January 2008 | |||
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Abstract:There is a phenomenon that the inverse image of a given celestial object could in principle be seen in negative directions in a closed universe which there is no horizon problem, but it is difficult to detect the individual case in practice. The large-scale distribution of galaxies in this matter has been discussed. Although there are many adverse factors, a possible way to identify the distribution pattern of galaxies is shown in the present paper. | |||
TO cite this article:Deng Xiaoming. A possible way to identify the fingerprint of the universe[OL].[21 January 2008] http://en.paper.edu.cn/en_releasepaper/content/18237 |
6. To disabuse the map of the universe | |||
Deng Xiaoming | |||
Astronomy 15 October 2007 | |||
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Abstract:The redshift distribution of galaxies (SDSS data) on the logarithmic map of the universe is explained by the linear expansion hyperspherical model. Our computed result show that the density distribution of galaxies take two peaks at redshift 0.108 and 0.362 and two minimum at redshift 0.229 and 0.510. It is shown that our model may fit the map well. It is proposed that celestial sphere should be defined by the comoving coordinates system. | |||
TO cite this article:Deng Xiaoming. To disabuse the map of the universe[OL].[15 October 2007] http://en.paper.edu.cn/en_releasepaper/content/15662 |
7. Dark matter may be invisible gravitational ghost images and not the real matter imagined | |||
Deng Xiaoming | |||
Astronomy 14 July 2006 | |||
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Abstract:According to the polar effect in the hyperspherical universe, we realize that “Dark matter” may be invisible gravitational ghost images originating from the matter around the poles and not the real natural matter. The twin pictures of the visible optical (electromagnetic) universe and the invisible gravitational ghost image universe are shown. | |||
TO cite this article:Deng Xiaoming. Dark matter may be invisible gravitational ghost images and not the real matter imagined[OL].[14 July 2006] http://en.paper.edu.cn/en_releasepaper/content/7591 |
8. The linear expansion hyperspherical universe | |||
Deng Xiaoming | |||
Astronomy 07 March 2006 | |||
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Abstract:From Karlsson’s formula and the polar effect, we realize that the half periodic parameter of redshift is 0.206, in theory, we finally explain why the great wall is at redshift Z=0.079 in redshift space; We have defined quasar as the early star nearby the position poles and opposite poles, and given the answer for two difficult problems of theirs; Based on the course of explanation for redshift space, we have reason to think that our universe might be the linear expansion hyperspherical universe. | |||
TO cite this article:Deng Xiaoming. The linear expansion hyperspherical universe[OL].[ 7 March 2006] http://en.paper.edu.cn/en_releasepaper/content/5551 |
9. Graphic solution of R-W metric for the case of positive curvature and cosmic entire space and time | |||
Deng Xiaoming | |||
Astronomy 20 January 2006 | |||
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Abstract:The vivid image of R-W metric for the case of hypersphere is given; The hypersphere is proposed as the only model for the physical universe; The cosmic radius R(t) may be defined as a cosmic broad time and the cosmic entire space is the three-dimensional front (hypersphere) of R(t) in four-dimensional Euclidean space; The structure of cosmic entire space and time is an absolute system. | |||
TO cite this article:Deng Xiaoming. Graphic solution of R-W metric for the case of positive curvature and cosmic entire space and time[OL].[20 January 2006] http://en.paper.edu.cn/en_releasepaper/content/5073 |
10. The lens effect of cosmic entire hyperspherical space | |||
Deng Xiaoming | |||
Astronomy 27 December 2005 | |||
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Abstract:There is a sort of new lens effect in hyperspherical universe, and it should result in some periodicity in observation. In addition, the cause of supernova and gamma ray burst may be given; the super radiation of quasars and the random variability of a quasar’s radiation are explained. Given the conclusion: All quasars observed by us, some are the early multiple images of stars or the nucleus of the milky way and others are the early multiple images of stars or galaxies nearby the opposite poles that relative to the milky way; the redshift Great Wall may be integrated into “the great redshift spherical shell” covering all of the sky. | |||
TO cite this article:Deng Xiaoming. The lens effect of cosmic entire hyperspherical space[OL].[27 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4673 |
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