搜索结果: 1-15 共查到“天体物理学 the SDSS”相关记录25条 . 查询时间(0.109 秒)
近日，国家天文台白宇副研究员、刘继峰研究员基于LAMOST和SDSS数据库，利用机器学习的方法，开发天体分类器和恒星温度回归器，并把天体分类器应用到最新发布的Gaia DR2星表，揭示了Gaia DR2中天体类型组成。这是国际上使用最大样本开发的天体分类器和恒星温度回归器，该项研究成果已经被《天文学杂志》（AJ）接收，应用于Gaia DR2的最新结果已经发表在《天文和天体物理学研究》（2018，R...
We report the discovery of cool DZ white dwarfs, which lie in the SDSS (u-g) vs. (g-r) two-color diagram across and below the main sequence. These stars represent the extension of the well-known DZ se...
Mining SDSS in search of Multiple Populations in Globular Clusters
Mining SDSS Multiple Populations Globular Clusters
2011/1/10
Several recent studies have reported the detection of an anomalous color spread along the red giant branch (RGB) of some globular clusters (GC) that appears only when color indices including a near ul...
Flying across Galaxy Clusters with Google Earth: additional imagery from SDSS co-added data
Flying across Galaxy Clusters Google Earth SDSS co-added data
2011/1/13
Galaxy clusters are spectacular. We provide a Google Earth compatible imagery for the deep co-added images from the Sloan Digital Sky Survey and make it a tool for examing galaxy clusters. More detail...
Faint NUV/FUV Standards from Swift/UVOT, GALEX and SDSS Photometry
Faint NUV/FUV Standards Swift/UVOT GALEX SDSS Photometry
2011/1/11
At present, the precision of deep ultraviolet photometry is somewhat limited by the dearth of faint ultraviolet standard stars. In an effort to improve this situation, we present a uniform catalog of ...
Redshift-Space Enhancement of Line-of-Sight Baryon Acoustic Oscillations in the SDSS Main-Galaxy Sample
cosmology large-scale structure of Universe - methods data analysis
2010/11/15
We show that redshift-space distortions of galaxy correlations have a strong e ect on correlation functions with distinct, localized features, like the signature of the Baryon Acoustic Oscillations (B...
The properties of Brightest Cluster Galaxies in the SDSS DR6 adaptive matched filter cluster catalogue
galaxies: clusters general – galaxies elliptical and lenticular
2010/11/15
We study the properties of Brightest Cluster Galaxies (BCGs) drawn from a catalogue of more than 69000 clusters in the SDSS DR6 based on the adaptive matched filter technique (AMF, Szabo et al., 2010)...
An Optical Catalog of Galaxy Clusters Obtained from an Adaptive Matched Filter Finder Applied to SDSS DR6
Optical Catalog of Galaxy Clusters Obtained Adaptive Matched Filter Finder Applied
2010/11/9
We present a new cluster catalog extracted from the Sloan Digital Sky Survey Data Release 6 (SDSS DR6) using an adaptive matched filter (AMF) cluster finder. We identify 69,173 galaxy clusters in the ...
SDSS-III/APOGEE: Detailed Abundances of Galactic Star Clusters
SDSS-III/APOGEE Detailed Abundances Galactic Star Clusters
2010/11/15
Sloan Digital Sky Survey III/Apache Point Observatory Galactic Evolution Experiment (SDSS-III/APOGEE) is a large-scale spectroscopic survey of Galactic stars and star clusters. The SDSS-III/APOGEE sur...
The GALEX Arecibo SDSS survey: III. Evidence for the Inside-Out Formation of Galactic Disks
galaxies evolution–ultraviolet galaxies
2010/11/10
We analyze a sample of galaxies with stellar masses greater than 1010M⊙ and with redshifts in
the range 0.025 < z < 0.05 for which HI mass measurements are available from the GALEX Arecibo SDSS Surve...
The quasar SDSS J142507.32+323137.4 : dual AGNs?
galaxies active — galaxies individual (SDSS J142507.32+323137.4) —quasars emission lines
2010/11/16
We analyze the optical spectrum of type 1 QSO SDSS J1425+3231. This object is interesting since its narrow emission lines such as [O III]4959, 5007 are doublepeaked,and the line structure can be mod...
The Angular Power Spectra of Photometric SDSS LRGs
Large Scale Structure Galaxy Clustering Dark Energy Cosmological Parameters and Photometric Redshifts
2010/11/15
We construct new galaxy angular power spectra C` based on the extended, updated and nal SDSS II Luminous Red Galaxy (LRG) photometric redshift survey{MegaZ(DR7). Encapsulating 7746 deg2 we utilise 72...
Revisiting the Hubble sequence in the SDSS DR7 spectroscopic sample: a publicly available bayesian automated classification
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Instrumentation and Methods for Astrophysics (astro-ph.IM)
2011/1/5
We present an automated morphological classification in 4 types (E,S0,Sab,Scd) of ~700.000 galaxies from the SDSS DR7 spectroscopic sample based on support vector machines. The main new property of th...
The SEGUE Stellar Parameter Pipeline. V. Estimation of Alpha-Element Abundance Ratios From Low-Resolution SDSS/SEGUE Stellar Spectra
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2011/1/5
We present a method for the determination of [alpha/Fe] ratios from low-resolution (R = 2000) SDSS/SEGUE stellar spectra.
Towards a fully consistent Milky Way disc model - II. The local disc model and SDSS data of the NGP region
Galaxy Astrophysics (astro-ph.GA)
2010/12/31
We have used the self-consistent vertical disc models of the solar neighbourhood presented in Just & Jahreiss (2010), which are based on different star formation histories (SFR) and fit the local kine...