Radio Line and Continuum Observations of Quasar-Galaxy Pairs and the Origin of Low Redshift Quasar Absorption Line Systems

There are a number of known quasars for which our line of sight to the high redshift quasar passes within a few Holmberg radii of a low redshift galaxy. In a few of these cases, spectra of the quasar reveal absorption by gas associated with the low redshift galaxy. A number of these pairs imply absorption by gas which lies well outside the optical disk of the associated galaxy, leading to models of galaxies with ‘halos’ or ‘disks’ of gas extending to large radii. We present observations of 4 such pairs. In three of the four cases, we find that the associated galaxy is highly disturbed, typically due to a gravitational interaction with a companion galaxy, while in the fourth case the absorption can be explained by clouds in the optical disk of the associated galaxy. We are led to an alternative hypothesis concerning the origin of the low redshift absorption line systems: the absorption is by gas clouds which have been gravitationally stripped from the associated galaxy. These galaxies are rapidly evolving, and should not be used as examples of absorption by clouds in halos of field spirals. We conclude by considering the role extended gas in interacting systems plays in the origin of higher redshift quasar absorption line systems.

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The Distribution of High‐Redshift Galaxy Colors: Line‐of‐Sight Variations in Neutral Hydrogen Absorption

The Astrophysical Journal ◽

10.1086/307257 ◽

1999 ◽

Vol 518 (1) ◽

pp. 103-116 ◽

Cited By ~ 30

Author(s):

Matthew A. Bershady ◽

Jane C. Charlton ◽

Janet M. Geoffroy

Keyword(s):

Hydrogen Absorption ◽

High Redshift ◽

Neutral Hydrogen ◽

Line Of Sight ◽

Redshift Galaxy

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Dissecting cold gas in a high-redshift galaxy using a lensed background quasar

Astronomy and Astrophysics ◽

10.1051/0004-6361/201833608 ◽

2018 ◽

Vol 619 ◽

pp. A142 ◽

Cited By ~ 7

Author(s):

J.-K. Krogager ◽

P. Noterdaeme ◽

J. M. O’Meara ◽

M. Fumagalli ◽

J. P. U. Fynbo ◽

...

Keyword(s):

High Redshift ◽

Gas Absorption ◽

Line Of Sight ◽

Lens Model ◽

Physical Separation ◽

Redshift Galaxy ◽

Solar Metallicity ◽

The Individual ◽

Relative Excitation ◽

Cold Gas

We present a study of cold gas absorption from a damped Lyman-α absorber (DLA) at redshift zabs = 1.946 toward two lensed images of the quasar J144254.78+405535.5 at redshift zQSO = 2.590. The physical separation of the two lines of sight at the absorber redshift is dabs = 0.7 kpc according to our lens model. We observe absorption lines from neutral carbon and H2 along both lines of sight, indicating that cold gas is present on scales larger than dabs. We measure the column densities of H I to be log N(HI) = 20.27 ± 0.02 and 20.34 ± 0.05 and those of H2 to be log N(H2) = 19.7 ± 0.1 and 19.9 ± 0.2. The metallicity inferred from sulphur is consistent with solar metallicity for both sightlines: [S/H]A = 0.0 ± 0.1 and [S/H]B = −0.1 ± 0.1. Based on the excitation of low rotational levels of H2, we constrain the temperature of the cold gas phase to be T = 109 ± 20 and T = 89 ± 25 K for the two lines of sight. From the relative excitation of fine-structure levels of C I, we constrain the hydrogen volumetric densities to lie in the range of 40 − 110 cm−3. Based on the ratio of observed column density and volumetric density, we infer the average individual “cloud” size along the line of sight to be l ≈ 0.1 pc. Using the transverse line-of-sight separation of 0.7 kpc together with the individual cloud size, we are able to place an upper limit to the volume filling factor of cold gas of fvol < 0.1%. Nonetheless, the projected covering fraction of cold gas must be large (close to unity) over scales of a few kpc in order to explain the presence of cold gas in both lines of sight. Compared to the typical extent of DLAs (∼10 − 30 kpc), this is consistent with the relative incidence rate of C I absorbers and DLAs.

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On a possible variation of the proton-to-electron mass ratio: H2 spectra in the line of sight of high-redshift quasars and in the laboratory

Journal of Molecular Spectroscopy ◽

10.1016/j.jms.2006.12.004 ◽

2007 ◽

Vol 241 (2) ◽

pp. 155-179 ◽

Cited By ~ 59

Author(s):

W. Ubachs ◽

R. Buning ◽

K.S.E. Eikema ◽

E. Reinhold

Keyword(s):

High Redshift ◽

Line Of Sight ◽

Electron Mass ◽

Mass Ratio

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FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. III. OBSERVABILITY AND CONNECTION TO HALO GLOBULAR CLUSTERS

The Astrophysical Journal ◽

10.1088/0004-637x/742/2/100 ◽

2011 ◽

Vol 742 (2) ◽

pp. 100 ◽

Cited By ~ 7

Author(s):

William J. Gray ◽

Evan Scannapieco

Keyword(s):

Globular Clusters ◽

High Redshift ◽

Stellar Clusters ◽

Redshift Galaxy

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HS 1700+6416: the first high-redshift unlensed narrow absorption line-QSO showing variable high-velocity outflows

Astronomy and Astrophysics ◽

10.1051/0004-6361/201219481 ◽

2012 ◽

Vol 544 ◽

pp. A2 ◽

Cited By ~ 27

Author(s):

G. Lanzuisi ◽

M. Giustini ◽

M. Cappi ◽

M. Dadina ◽

G. Malaguti ◽

...

Keyword(s):

Absorption Line ◽

High Velocity ◽

High Redshift

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Kinematics of a high-redshift galaxy: A case study

Serbian Astronomical Journal ◽

10.2298/saj0061005c ◽

2000 ◽

pp. 5-8

Author(s):

M.M. Cirkovic

Keyword(s):

Interstellar Medium ◽

Absorption Spectroscopy ◽

High Redshift ◽

Redshift Galaxy

A kinematics of a z = 2.81 galaxy toward bright QSO 0528-250, as inferred from the absorption spectroscopy is discussed. There are sufficient arguments for a far-reaching conclusion that we are observing an older, uninvolved version of the local Galactic interstellar medium.

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Spectral energy distribution similarity of the local galaxies and the 3.6 μm selected galaxies from the Spitzer Extended Deep Survey

Research in Astronomy and Astrophysics ◽

10.1088/1674-4527/21/10/260 ◽

2021 ◽

Vol 21 (10) ◽

pp. 260

Author(s):

Cheng Cheng ◽

Jia-Sheng Huang ◽

Hai Xu ◽

Gao-Xiang Jin ◽

Chuan He ◽

...

Keyword(s):

High Redshift ◽

Spectral Energy Distribution ◽

Mass Function ◽

Spectral Energy ◽

Energy Distributions ◽

Mid Infrared ◽

Redshift Galaxy ◽

The Galaxy ◽

Deep Survey ◽

Multi Wavelength

Abstract The Spitzer Extended Deep Survey (SEDS) as a deep and wide mid-infrared (MIR) survey project provides a sample of 500 000+ sources spreading 1.46 square degree and a depth of 26 AB mag (3σ). Combining with the previous available data, we build a PSF-matched multi-wavelength photometry catalog from u band to 8 μm. We fit the SEDS galaxies spectral energy distributions by the local galaxy templates. The results show that the SEDS galaxy can be fitted well, indicating the high redshift galaxy (z ∼ 1) shares the same templates with the local galaxies. This study would facilitate the further study of the galaxy luminosity and high redshift mass function.

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