scholarly journals Quasar absorption line studies of galaxies and the intergalactic medium at

1999 ◽  
Author(s):  
Lisa J. Storrie-Lombardi
Keyword(s):  
Absorption Line ◽  
Intergalactic Medium

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 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

scholarly journals Simulations of the Intergalactic Medium

2005 ◽  
Vol 216 ◽  
pp. 251-265
Author(s):  
Romeel Davé
Keyword(s):  
Absorption Line ◽  
Galaxy Formation ◽  
Intergalactic Medium ◽  
Ultraviolet Absorption ◽  
Multiple Populations ◽  
Hydrodynamic Simulations ◽  
Lyman Alpha ◽  
Lyman Alpha Forest ◽  
Working Together

I present an epochal review of baryons in the intergalactic medium (IGM), from the reionization epoch until today. Recent observations indicate a protracted period of reionization, suggesting multiple populations of reionizers; detection of these z ≳ 6 sources is a key goal that is now coming within reach. The optical Lyman alpha forest (2 ≲ z ≲ 4) is well-described by the Fluctuating Gunn-Peterson Approximation, but recent observations of galaxies and metal lines associated with Lyα absorbers remain puzzling. IGM studies at z ≲ 1.5 are progressing rapidly thanks to ultraviolet absorption line studies of both Lyα absorbers and the warm-hot intergalactic medium. Cosmological hydrodynamic simulations have played an integral part in these advances, and have helped to revolutionize our understanding of the IGM at various epochs. Working together, observations and theory continue to expand our knowledge of the IGM as the earliest stage of galaxy formation and the dominant reservoir of baryons at all redshifts.

scholarly journals MULTIPLE ABSORPTION-LINE SPECTROSCOPY OF THE INTERGALACTIC MEDIUM. I. MODEL

2011 ◽  
Vol 730 (2) ◽  
pp. 143 ◽  
Author(s):  
Yangsen Yao ◽  
J. Michael Shull ◽  
Charles W. Danforth ◽  
Brian A. Keeney ◽  
John T. Stocke
Keyword(s):  
Absorption Line ◽  
Intergalactic Medium ◽  
Multiple Absorption

Erratum: “A Measurement of the Temperature‐Density Relation in the Intergalactic Medium Using a New Lyα Absorption Line Fitting Method” (ApJ, 562, 52 [2001])

2003 ◽  
Vol 598 (1) ◽  
pp. 712-712 ◽  
Author(s):  
Patrick McDonald ◽  
Jordi Miralda‐Escude ◽  
Michael Rauch ◽  
Wallace L. W. Sargent ◽  
Tom A. Barlow ◽  
...  
Keyword(s):  
Absorption Line ◽  
Intergalactic Medium ◽  
Fitting Method ◽  
Density Relation ◽  
Line Fitting

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.

scholarly journals A Measurement of the Temperature‐Density Relation in the Intergalactic Medium Using a New Lyα Absorption‐Line Fitting Method

2001 ◽  
Vol 562 (1) ◽  
pp. 52-75 ◽  
Author(s):  
Patrick McDonald ◽  
Jordi Miralda‐Escude ◽  
Michael Rauch ◽  
Wallace L. W. Sargent ◽  
Tom A. Barlow ◽  
...  
Keyword(s):  
Absorption Line ◽  
Intergalactic Medium ◽  
Fitting Method ◽  
Density Relation ◽  
Line Fitting

Absorption-line series in Lu I

1972 ◽  
Vol 33 (2-3) ◽  
pp. 197-201 ◽  
Author(s):  
P. Camus ◽  
F.S. Tomkins
Keyword(s):  
Absorption Line

Detection of Absorption‐Line Features in the X‐Ray Spectra of the Galactic Superluminal Source GRO J1655–40

1998 ◽  
Vol 500 (2) ◽  
pp. 1069-1069 ◽  
Author(s):  
Y. Ueda ◽  
H. Inoue ◽  
Y. Tanaka ◽  
K. Ebisawa ◽  
F. Nagase ◽  
...  
Keyword(s):  
Absorption Line ◽  
X Ray ◽  
Line Features

scholarly journals Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities

2020 ◽  
Vol 634 ◽  
pp. A111 ◽  
Author(s):  
J. P. U. Fynbo ◽  
P. Møller ◽  
K. E. Heintz ◽  
J. N. Burchett ◽  
L. Christensen ◽  
...  
Keyword(s):  
Emission Line ◽  
Absorption Line ◽  
Emission Lines ◽  
Broad Absorption ◽  
Broad Absorption Line ◽  
Red Edge ◽  
First Case ◽  
Bl Lac ◽  
Spatially Extended ◽  
Extended Emission

We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Si IV, C IV, and Al III, a redshift of z = 2.41 was established under the assumption that the systemic redshift can be inferred from the red edge of the BAL troughs. However, we observe a weak and spatially extended emission line at 4450 Å that is most likely due to Lyman-α emission, which implies a systemic redshift of z = 2.66 if correctly identified. There is also evidence for the onset of Lyman-α forest absorption bluewards of 4450 Å and evidence for Hα emission in the K band consistent with a systemic redshift of z = 2.66. If this redshift is correct, the quasar is an extreme example of a detached low-ionisation BAL quasar. The BALs must originate from material moving with very large velocities ranging from 22 000 km s−1 to 40 000 km s−1. To our knowledge, this is the first case of a systemic-redshift measurement based on extended Lyman-α emission for a BAL quasar. This method could also be useful in cases of sufficiently distant BL Lac quasars without systemic-redshift information.

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