Discovery of Narrow X-Ray Absorption Lines from NGC 3783 with the Chandra High Energy Transmission Grating Spectrometer [0.03%]
用钱德拉高能传输光栅分光计发现NGC 3783的X射线吸收窄谱线
S Kaspi,WN Brandt,H Netzer et al.
S Kaspi et al.
We present the first grating-resolution X-ray spectra of the Seyfert 1 galaxy NGC 3783, obtained with the High Energy Transmission Grating Spectrometer on the Chandra X-Ray Observatory. These spectra reveal many narrow absorption lines from...
M Kerscher,I Szapudi I,AS Szalay
M Kerscher
Nine of the most important estimators known for the two-point correlation function are compared using a predetermined, rigorous criterion. The indicators were extracted from over 500 subsamples of the Virgo Hubble volume simulation cluster ...
A Cooray,W Hu,J Miralda-Escudé
A Cooray
Weak gravitational lensing observations probe the spectrum and evolution of density fluctuations and the cosmological parameters that govern them, but they are currently limited to small fields and subject to selection biases. We show how t...
Y Hoffman,S Zaroubi
Y Hoffman
Using eigenmode expansion of the Mark III and SFI surveys of cosmological radial velocities, a goodness-of-fit analysis is applied on a mode-by-mode basis. This differential analysis complements the Bayesian maximum likelihood analysis that...
Cosmological Parameters from the Eigenmode Analysis of the Las Campanas Redshift Survey [0.03%]
基于Las Campanas红移巡天的本征模分析得到的宇宙学参数
T Matsubara,AS Szalay,SD Landy
T Matsubara
We present the first results of the Karhunen-Loève eigenmodes applied to real data of the Las Campanas Redshift Survey to simultaneously measure the values of the redshift distortion parameter beta=Omega0.60&solm0;b, the linearly extrapola...
AS Wong,AY Lee,YL Yung et al.
AS Wong et al.
Aromatic compounds have been considered a likely candidate for enhanced aerosol formation in the polar region of Jupiter. We develop a new chemical model for aromatic compounds in the Jovian auroral thermosphere/ionosphere. The model is bas...
T Toutain,AG Kosovichev
T Toutain
We suggest a solution to an important problem in observational helioseismology of the separation of lines of solar acoustic (p) modes of low angular degree in oscillation power spectra by constructing optimal masks for Doppler images of the...
6Li from Solar Flares [0.03%]
太阳耀斑中的锂6元素
R Ramaty,V Tatischeff V,JP Thibaud et al.
R Ramaty et al.
By introducing a hitherto ignored 6Li producing process, due to accelerated 3He reactions with 4He, we show that accelerated particle interactions in solar flares produce much more 6Li than 7Li. By normalizing our calculations to gamma-ray ...
SM White,RJ Thomas,JW Brosius et al.
SM White et al.
We present a measurement of the abundance of Fe relative to H in the solar corona using a technique that differs from previous spectroscopic and solar wind measurements. Our method combines EUV line data from the Coronal Diagnostic Spectrom...
J Cernicharo,JR Goicoechea,E Caux
J Cernicharo
We report on the detection of nine lines of the nu2 bending mode of triatomic carbon, C3, in the direction of Sagittarius B2. The R(4) and R(2) lines of C3 have been also detected in the carbon-rich star IRC +10216. The abundances of C3 in ...