scholarly journals Measuring the temperature and profiles of Ly α absorbers

2019 ◽  
Vol 492 (2) ◽  
pp. 2193-2207 ◽  
Author(s):  
Antonella Garzilli ◽  
Tom Theuns ◽  
Joop Schaye
Keyword(s):  
Absorption Line ◽  
Intergalactic Medium ◽  
Reference Model ◽  
New Method ◽  
Line Broadening ◽  
Photoionization Rate

ABSTRACT The distribution of the absorption line broadening observed in the Ly α forest carries information about the temperature, T, and widths, λF, of the filaments in the intergalactic medium (IGM), and the background hydrogen photoionization rate, $\Gamma _{\rm H\, \small {I}}$. In this work, we present and test a new method for inferring T and λF and $\Gamma _{\rm H\, \small {I}}$ from combining the distribution of the absorption line broadening and the median flux. The method accounts for any underlying degeneracies. We apply our method to mock spectra from the reference model of the EAGLE cosmological simulation, and we demonstrate that we are able to reconstruct the IGM properties.

Resonance Broadening and Oscillator strength of the Mercury Absorption Line 1850 Å

1975 ◽  
Vol 30 (4) ◽  
pp. 445-450 ◽  
Author(s):  
D. Gebhard ◽  
W. Behmenburg
Keyword(s):  
Absorption Line ◽  
Oscillator Strength ◽  
Resonance Absorption ◽  
New Method ◽  
Absorption Lines ◽  
Resonance Transition ◽  
Resonance Transitions ◽  
Resonance Broadening

Abstract A new method for the determination of f-values of resonance transitions from wing-measurements of selfbroadened resonance absorption lines is described. The method is applied to the mercury resonance transition 61 S0→61P1, λ 1850 Å. The resulting f-value of 1.08±0.05 agrees well with those obtained from other methods.

Absorption Line Broadening in the Infrared

1962 ◽  
Vol 1 (3) ◽  
pp. 359 ◽  
Author(s):  
Darrell E. Burch ◽  
Edgar B. Singleton ◽  
Dudley Williams
Keyword(s):  
Absorption Line ◽  
Line Broadening

scholarly journals Probing Warm-Hot Intergalactic Medium Associated with the Virgo Cluster Using an Oxygen Absorption Line

2004 ◽  
Vol 56 (5) ◽  
pp. L29-L34 ◽  
Author(s):  
Ryuichi Fujimoto ◽  
Yoh Takei ◽  
Takayuki Tamura ◽  
Kazuhisa Mitsuda ◽  
Noriko Y. Yamasaki ◽  
...  
Keyword(s):  
Absorption Line ◽  
Intergalactic Medium ◽  
Virgo Cluster ◽  
Oxygen Absorption

scholarly journals New Ways to Rotation Rates

1989 ◽  
Vol 107 ◽  
pp. 235-243
Author(s):  
R. E. Wilson
Keyword(s):  
Light Curves ◽  
New Method ◽  
Line Broadening ◽  
Rotation Rates ◽  
Fast Rotating

AbstractProgress in determining rotation rates of Algol primary stars from light curves is assessed. Included are elementary ideas on why the new method works, how to carry out solutions, and how and when to apply the constraint on rotational lobe filling. Some comments are made on desirable improvements for measuring rotation from line broadening. A few remarks are made about the problem of identifying likely fast rotating Algols.

A NEW METHOD FOR FACIAL FEATURES QUANTIFICATION OF CARICATURE BASED ON SELF-REFERENCE MODEL

2008 ◽  
Vol 22 (08) ◽  
pp. 1647-1668 ◽  
Author(s):  
FEI NI ◽  
ZHUANG FU ◽  
QIXIN CAO ◽  
YANZHENG ZHAO
Keyword(s):  
Reference Model ◽  
Face Image ◽  
The Self ◽  
New Method ◽  
Front Face ◽  
Facial Features ◽  
Face Model ◽  
Input Face ◽  
Facial Images ◽  
Self Reference

Some facial features that differ from an ordinary face should be identified by a computer when generating a facial caricature. These distinctive facial features are called self-features. Compared with traditional Mean Face Model (MFM) that is unable to quantify these self-features well, a Self-Reference Model (SRM) is presented in this paper. Firstly, based on the physiology structure of a front face, a self-reference is found, and this reference is used to measure the self-features. According to the self-reference, some standard facial parameters are worked out by collecting statistic data of many facial images. Then, in an input face image, by evaluating some differences between the input face and the standard facial parameters, the self-features are properly estimated and quantified. Finally, by analyzing some caricatures produced by caricaturists, the SRM can prove the validity of the proposed Algorithm.

scholarly journals CHANDRAVIEW OF THE WARM-HOT INTERGALACTIC MEDIUM TOWARD 1ES 1553+113: ABSORPTION-LINE DETECTIONS AND IDENTIFICATIONS. I.

2013 ◽  
Vol 769 (2) ◽  
pp. 90 ◽  
Author(s):  
F. Nicastro ◽  
M. Elvis ◽  
Y. Krongold ◽  
S. Mathur ◽  
A. Gupta ◽  
...  
Keyword(s):  
Absorption Line ◽  
Intergalactic Medium
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