scholarly journals Sizes of Intervening C IV Absorbers from High Resolution Spectroscopy of APM 0827+5255

2004 ◽  
Vol 217 ◽  
pp. 272-274
Author(s):  
Panayiotis Tzanavaris ◽  
Robert F. Carswell
Keyword(s):  
High Resolution ◽  
Lower Limit ◽  
Absorption Lines ◽  
High Resolution Spectroscopy ◽  
Line Of Sight ◽  
Total Coverage ◽  
Best Estimates

Some intervening C IV absorbers in the Keck/HIRES spectrum of APM 0827+5255 give rise to absorption lines for which the observed optical depths for the doublet components are not in the expected 2 : 1 ratio. We model this effect as coverage of one line of sight to this gravitationally lensed quasar and perform a set of simulations to select a sample of lines for which our model provides an explanation for the effect. We use lines in this sample to obtain estimates for minimum absorber sizes from total coverage and the separations of the lines of sight for a range of lens redshifts, z1, and two cosmologies. We also obtain best estimates for overall sizes from a statistical “hit and miss” approach. For z1 = 0.7 our results set a lower limit to sizes of C IV absorbers of ~ 0.3 h−172 kpc (~ 0.5 h−172 kpc) for ΩM = 1, ΩA = 0 (ΩM = 0.3, ΩA = 0.7).

High Resolution Spectroscopy of Absorption Lines in the Z = 1.7 BL LAC Object 0215+015

Quasars ◽  
1986 ◽  
pp. 571-572
Author(s):  
J. Chris Blades ◽  
Richard W. Hunstead ◽  
Hugh S. Murdoch ◽  
Max Pettini
Keyword(s):  
High Resolution ◽  
Absorption Lines ◽  
High Resolution Spectroscopy ◽  
Bl Lac

scholarly journals Interstellar Matter with Very Large Telescopes

1984 ◽  
Vol 79 ◽  
pp. 675-678
Author(s):  
J. Lequeux
Keyword(s):  
High Resolution ◽  
Absorption Lines ◽  
High Resolution Spectroscopy ◽  
Interstellar Matter ◽  
Large Telescope ◽  
Interstellar Absorption ◽  
Near Ir ◽  
Very Large Telescope ◽  
Large Telescopes ◽  
Diffuse Matter

Interstellar matter is certainly one of the fields where a very large telescope (VLT) will prove to be most fruitful. This includes (somewhat paradoxically, but this will be explained later) the study of extended emissions. I will now examine in turn the different domains of interest for a VLT.I. Neutral diffuse matterOptical and near IR observations will mainly contribute to this domain through high-resolution spectroscopy of interstellar absorption lines in the spectra of stars. These lines are resonant lines of atoms (NaI, KI, etc.) or ions (CaII, TiII, etc.) as well as of some molecules (CH+, CH, CN, CS+, C2 in the near IR). Clearly this kind of study is always photon - limited; a VLT will collect more photons than present telescopes, thus increase the possibilities considerably.

Terahertz quantum-cascade lasers for high-resolution spectroscopy of sharp absorption lines

2019 ◽  
Vol 125 (15) ◽  
pp. 151613 ◽  
Author(s):  
B. Röben ◽  
X. Lü ◽  
K. Biermann ◽  
L. Schrottke ◽  
H. T. Grahn
Keyword(s):  
High Resolution ◽  
Quantum Cascade Lasers ◽  
Absorption Lines ◽  
High Resolution Spectroscopy ◽  
Quantum Cascade ◽  
Cascade Lasers

scholarly journals High resolution spectroscopy of absorption lines in the Z = 1.7 BL Lac object 0215+015

1986 ◽  
Vol 119 ◽  
pp. 571-572
Author(s):  
J. Chris Blades ◽  
Richard W. Hunstead ◽  
Hugh S. Murdoch ◽  
Max. Pettini
Keyword(s):  
High Resolution ◽  
Absorption Lines ◽  
High Resolution Spectroscopy ◽  
Bl Lac

We describe the various absorption systems in 0215+015, and present results from our new, high-resolution studies at 10 km/sec (FWHM).

scholarly journals Subaru High-Resolution Spectroscopy of Complex Metal Absorption Lines of the Quasar HS 1603+3820

2003 ◽  
Vol 125 (3) ◽  
pp. 1336-1344 ◽  
Author(s):  
Toru Misawa ◽  
Toru Yamada ◽  
Masahide Takada-Hidai ◽  
Yiping Wang ◽  
Nobunari Kashikawa ◽  
...  
Keyword(s):  
High Resolution ◽  
Absorption Lines ◽  
High Resolution Spectroscopy ◽  
Complex Metal ◽  
Metal Absorption

scholarly journals Keck High-Resolution Spectroscopy of Mrk 335: Constraints on the Number of Emitting Clouds in the BLR

1997 ◽  
Vol 159 ◽  
pp. 211-212
Author(s):  
Nahun Arav ◽  
Tom A. Barlow ◽  
Roger D. Blandford ◽  
Ari Laor
Keyword(s):  
High Resolution ◽  
Lower Limit ◽  
Optical Depth ◽  
Cross Correlation ◽  
Stellar Atmospheres ◽  
High Resolution Spectroscopy ◽  
Line Center ◽  
Line Current

AbstractBy applying cross-correlation (CC) techniques to high-resolution (~ 6km s−1), high S/N (~ 400 at Hα line center) spectra of Mrk 335, we are able to put a lower limit of ~ 3 × 106 on the number of emitting clouds in this objects. This limit is applicable for clouds with T = 2 × 104 K and an optical depth of a few hundred in their Hα line. Current BEL models based on stellar atmospheres of bloated stars can be ruled out based on this lower limit.

scholarly journals Interstellar sodium and Galactic structure. A high-resolution survey

1985 ◽  
Vol 106 ◽  
pp. 325-328
Author(s):  
E. Maurice ◽  
A. Ardeberg ◽  
H. Lindgren
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Absorption Lines ◽  
High Spectral Resolution ◽  
Line Of Sight ◽  
Substantial Part ◽  
Galactic Rotation ◽  
Interstellar Gas ◽  
Interstellar Clouds ◽  
The Galaxy

Observation of absorption lines produced by interstellar gas is a straight-forward way to determine column densities and velocities along the line of sight of interstellar clouds. In practice, peculiar motions often mask galactic rotation and/or cause line blending. We have made a study of absorption lines of interstellar sodium covering a substantial part of the Galaxy at extremely high spectral resolution.

scholarly journals Hitomi X-ray Astronomy Satellite: Power of High-Resolution Spectroscopy

2016 ◽  
Vol 11 (S322) ◽  
pp. 197-203
Author(s):  
Hirokazu Odaka ◽  
Keyword(s):  
High Resolution ◽  
Velocity Dispersion ◽  
Galactic Center ◽  
Emission Lines ◽  
High Resolution Spectroscopy ◽  
Line Of Sight ◽  
Sudden Loss ◽  
X Ray ◽  
Turbulent Pressure ◽  
Perseus Cluster

AbstractHitomi (ASTRO-H) is an X-ray observatory developed by an international collaboration led by JAXA. An X-ray microcalorimeter onboard this satellite has opened a new window of high-resolution spectroscopy with an unprecedented energy resolution of 5 eV (FWHM) at 6 keV. The spacecraft was launched on February 17, 2016 from Tanegashima Island, Japan, and we completed initial operations including deployment of the hard X-ray imagers on the extensible optical bench. All scientific instruments had successfully worked until the sudden loss of the mission on March 26. We have obtained a spectrum showing fully resolved emission lines through the first-light observation of the Perseus Cluster. The line-of-sight velocity dispersion of 164 ± 10 km s−1 reveals the quiescent environment of intracluster medium at the cluster core, implying that measured cluster mass requires little correction for the turbulent pressure. We also discuss observations to the Galactic Center which could be performed with Hitomi.

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