Hydrogen and metal absorption lines in PKS 0405-123 from the halos of low redshift galaxies

1993 ◽  
Vol 106 ◽  
pp. 1 ◽  
Author(s):  
Hyron Spinrad ◽  
Alexei V. Filippenko ◽  
H. K. Yee ◽  
Erica Ellingson ◽  
J. C. Blades ◽  
...  
Keyword(s):  
Absorption Lines ◽  
Metal Absorption ◽  
Redshift Galaxies

scholarly journals Accurately predicting the escape fraction of ionizing photons using rest-frame ultraviolet absorption lines

2018 ◽  
Vol 616 ◽  
pp. A30 ◽  
Author(s):  
J. Chisholm ◽  
S. Gazagnes ◽  
D. Schaerer ◽  
A. Verhamme ◽  
J. R. Rigby ◽  
...  
Keyword(s):  
Early Universe ◽  
Rest Frame ◽  
High Redshift ◽  
Flux Ratio ◽  
Companion Paper ◽  
Absorption Lines ◽  
Indirect Methods ◽  
High Redshift Galaxies ◽  
Lyman Continuum ◽  
Redshift Galaxies

The fraction of ionizing photons that escape high-redshift galaxies sensitively determines whether galaxies reionized the early Universe. However, this escape fraction cannot be measured from high-redshift galaxies because the opacity of the intergalactic medium is large at high redshifts. Without methods to measure the escape fraction of high-redshift galaxies indirectly, it is unlikely that we will know what reionized the Universe. Here, we analyze the far-ultraviolet (UV) H I (Lyman series) and low-ionization metal absorption lines of nine low-redshift, confirmed Lyman continuum emitting galaxies. We use the H I covering fractions, column densities, and dust attenuations measured in a companion paper to predict the escape fraction of ionizing photons. We find good agreement between the predicted and observed Lyman continuum escape fractions (within 1.4σ) using both the H I and ISM absorption lines. The ionizing photons escape through holes in the H I, but we show that dust attenuation reduces the fraction of photons that escape galaxies. This means that the average high-redshift galaxy likely emits more ionizing photons than low-redshift galaxies. Two other indirect methods accurately predict the escape fractions: the Lyα escape fraction and the optical [O III]/[O II] flux ratio. We use these indirect methods to predict the escape fraction of a sample of 21 galaxies with rest-frame UV spectra but without Lyman continuum observations. Many of these galaxies have low escape fractions (fesc ≤ 1%), but 11 have escape fractions >1%. Future studies will use these methods to measure the escape fractions of high-redshift galaxies, enabling upcoming telescopes to determine whether star-forming galaxies reionized the early Universe.

Identification of Metal Absorption Lines on Quasar Spectra of SDSS DR9

2014 ◽  
Vol 35 (3) ◽  
pp. 529-531
Author(s):  
Cai-Juan Pan ◽  
Cheng-Yu Su ◽  
Mu-Sheng Li ◽  
Wei-Rong Huang
Keyword(s):  
Absorption Lines ◽  
Quasar Spectra ◽  
Metal Absorption

A new spectroscopic survey for damped Ly-alpha absorption lines from high-redshift galaxies

1991 ◽  
Vol 77 ◽  
pp. 1 ◽  
Author(s):  
Kenneth M. Lanzetta ◽  
Richard G. McMahon ◽  
Arthur M. Wolfe ◽  
David A. Turnshek ◽  
Cyril Hazard ◽  
...  
Keyword(s):  
High Redshift ◽  
Absorption Lines ◽  
High Redshift Galaxies ◽  
Redshift Galaxies

Galactic outflows in star-forming galaxies at z ∼ 6 studied with deep UV spectra and ALMA emission line

2019 ◽  
Vol 15 (S341) ◽  
pp. 307-308
Author(s):  
Yuma Sugahara ◽  
Masami Ouchi ◽  
Yuichi Harikane ◽  
Nicolas Bouché ◽  
Peter D. Mitchell ◽  
...  
Keyword(s):  
Maximum Velocity ◽  
Uv Spectra ◽  
Emission Lines ◽  
Absorption Lines ◽  
Line Profiles ◽  
Strong Emission ◽  
Star Forming ◽  
Lyman Break Galaxies ◽  
Metal Absorption ◽  
Galactic Outflows

AbstractWe present a velocity of galactic outflows in star-forming galaxies at the highest redshift, z ∼ 6, so far studied with metal absorption lines. Absorption-line studies of galactic outflows need well-determined redshifts, but there are few strong emission lines in the observed-frame optical spectra of galaxies at high redshifts. In this work, we use the systemic redshifts determined by the ALMA [CII]158 μm emission lines. The sample consists of seven Lyman break galaxies at 5.1 < z < 5.7 whose Keck/DEIMOS and ALMA data are available in the archive. The outflow maximum velocity (νmax) is estimated by a fitting of line profiles to metal absorption lines in a composite spectrum. We find that νmax monotonically increases from z ∼ 0 to 6 and that νmax tightly correlates with the halo circular velocity estimated from the stellar mass.

scholarly journals Are cold flows detectable with metal absorption lines?

2011 ◽  
Vol 413 (1) ◽  
pp. L51-L55 ◽  
Author(s):  
Taysun Kimm ◽  
Adrianne Slyz ◽  
Julien Devriendt ◽  
Christophe Pichon
Keyword(s):  
Absorption Lines ◽  
Metal Absorption

scholarly journals On the Interpretation of QSO Absorption Lines

1988 ◽  
Vol 130 ◽  
pp. 571-571
Author(s):  
V. Müller ◽  
J. P. Mücket ◽  
S. Gottlöber ◽  
H. J. Haubold
Keyword(s):  
High Resolution ◽  
Correlation Analysis ◽  
Temperature Profile ◽  
Absorption Spectra ◽  
Significant Positive Correlation ◽  
Radiation Transport ◽  
Absorption Lines ◽  
Positive Correlation ◽  
Metal Absorption ◽  
Inhomogeneous Temperature

OSO absorption spectra may offer a clue to the distribution of intervening matter clouds at z = 0 … 3. We tackle 1) the question of the occurrence of metal absorption lines of different ionisation levels in the same redshift systems by investigating the radiation transport through an inhomogeneous temperature profile; 2) the clustering properties of the lines of the Lyα forest by a correlation analysis of 9 published high-resolution QSO-spectra with the result of a certain contribution of metal absorption lines as well as marginally significant positive correlation regions ξ ≈ 0.3.

scholarly journals Tracing the re-ionization-epoch intergalactic medium with metal absorption lines

2009 ◽  
Vol 396 (2) ◽  
pp. 729-758 ◽  
Author(s):  
Benjamin D. Oppenheimer ◽  
Romeel Davé ◽  
Kristian Finlator
Keyword(s):  
Intergalactic Medium ◽  
Absorption Lines ◽  
Metal Absorption

scholarly journals Detectability of cold streams into high-redshift galaxies by absorption lines

2012 ◽  
Vol 424 (3) ◽  
pp. 2292-2315 ◽  
Author(s):  
Tobias Goerdt ◽  
Avishai Dekel ◽  
Amiel Sternberg ◽  
Orly Gnat ◽  
Daniel Ceverino
Keyword(s):  
High Redshift ◽  
Absorption Lines ◽  
High Redshift Galaxies ◽  
Redshift Galaxies

scholarly journals A ghostly damped Ly α system revealed by metal absorption lines

2016 ◽  
Vol 466 (1) ◽  
pp. L58-L62 ◽  
Author(s):  
H. Fathivavsari ◽  
P. Petitjean ◽  
S. Zou ◽  
P. Noterdaeme ◽  
C. Ledoux ◽  
...  
Keyword(s):  
Absorption Lines ◽  
Metal Absorption
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