Zero-Metallicity Stars and the Effects of the First Stars on Reionization [0.03%]
无金属丰度恒星及第一代恒星对再离子化的影响
J Tumlinson,JM Shull
J Tumlinson
We present stellar structure and atmosphere models of metal-free stars and examine them from a cosmological point of view. Metal-free stars exhibit high effective temperatures and small sizes relative to metal-enriched stars of equal mass. ...
W Hu,PJ Peebles
W Hu
This model assumes the baryons, radiation, three families of massless neutrinos, and cold dark matter were mutually thermalized before the baryon number was fixed, primeval curvature fluctuations were subdominant, and homogeneity was broken...
J Magueijo
J Magueijo
We extend a previous bispectrum analysis of the cosmic microwave background temperature anisotropy, allowing for the presence of correlations between different angular scales. We find a strong non-Gaussian signal in the "interscale" compone...
F Varadi,RK Ulrich,L Bertello et al.
F Varadi et al.
In a previous paper (Varadi et al.), random-lag singular spectrum analysis was introduced for finding oscillations in very noisy and long time series. This work presents a generalization of the technique to search for common oscillations in...
D Maia,M Pick,A Vourlidas et al.
D Maia et al.
We present observational imaging evidence for the existence of metric radio bursts closely associated with the front edge of coronal mass ejections (CMEs). These radio bursts drift in frequency similarly to type II bursts. They are weak and...
TRACE-derived Temperature and Emission Measure Profiles along Long-lived Coronal Loops: The Role of Filamentation [0.03%]
基于TRACE的活动区长时间存活着磁环冠状暗条的作用下的温度和发射度分布特征研究
F Reale,G Peres
F Reale
In a recent Letter, Lenz et al. have shown evidence of uniform temperature along steady long coronal loops observed by TRACE in two different passbands (171 and 195 Å filters). We propose that such a piece of evidence can be explained by t...
K Tomisaka
K Tomisaka
If the angular momentum of the molecular cloud core were conserved during the star formation process, a newborn star would rotate much faster than its fission speed. This constitutes the angular momentum problem of newborn stars. In this Le...
P Schilke,DM Mehringer,KM Menten
P Schilke
We report the detection of a strong submillimeter-wavelength HCN laser line at a frequency near 805 GHz toward the carbon star IRC +10216. This line, the J=9-8 rotational transition within the (0400) vibrationally excited state, is one of a...
I Yamamura I,K Kawaguchi,ST Ridgway
I Yamamura I
We report the identification of SH Deltav=1 ro-vibrational lines in the published high-resolution infrared spectrum of the S-type star R Andromedae. This is the first astronomical detection of this molecule. The lines show inverse P Cygni p...
TW Baumgarte,SL Shapiro,M Shibata
TW Baumgarte
We construct relativistic equilibrium models of differentially rotating neutron stars and show that they can support significantly more mass than their nonrotating or uniformly rotating counterparts. We dynamically evolve such "hypermassive...