The C IV absorption-Mg II kinematics connection in 〉z〈 ∼ 0.7 galaxies

Christopher W. Churchill; Richard R. Mellon; Jane C. Charlton; Buell T. Jannuzi; Sofia Kirhakos; Charles C. Steidel; Donald P. Schneider

doi:10.1086/312102

The C IV absorption-Mg II kinematics connection in 〉z〈 ∼ 0.7 galaxies

Christopher W. Churchill, Richard R. Mellon, Jane C. Charlton, Buell T. Jannuzi, Sofia Kirhakos, Charles C. Steidel, Donald P. Schneider

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV λλ1548, 1550 absorption associated with 40 Mg II λλ2796, 2803 absorption-selected galaxies at 0.4 ≤ z ≤ 1.4. We report a strong correlation between Mg II kinematics, measured in ∼6 km s^-1 resolution HIRES/Keck spectra, and W_r(1548); this implies a physical connection between the processes that produce "outlying velocity" Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition W_r(1548)/W_r(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-red shift galaxies. We find tentative evidence (2 σ) that W_r(1548)/W_r(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z ∼ 1.

Original language	English (US)
Pages (from-to)	L43-L46
Journal	Astrophysical Journal
Volume	519
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/312102
State	Published - Jul 1 1999
Externally published	Yes

Keywords

Galaxies: evolution
Galaxies: halos
Quasars: absorption lines

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/312102

Cite this

@article{ebbcfae8bf8d449c97132d58c4ae1b42,

title = "The C IV absorption-Mg II kinematics connection in 〉z〈 ∼ 0.7 galaxies",

abstract = "We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV λλ1548, 1550 absorption associated with 40 Mg II λλ2796, 2803 absorption-selected galaxies at 0.4 ≤ z ≤ 1.4. We report a strong correlation between Mg II kinematics, measured in ∼6 km s-1 resolution HIRES/Keck spectra, and Wr(1548); this implies a physical connection between the processes that produce {"}outlying velocity{"} Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition Wr(1548)/Wr(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-red shift galaxies. We find tentative evidence (2 σ) that Wr(1548)/Wr(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z ∼ 1.",

keywords = "Galaxies: evolution, Galaxies: halos, Quasars: absorption lines",

author = "Churchill, {Christopher W.} and Mellon, {Richard R.} and Charlton, {Jane C.} and Jannuzi, {Buell T.} and Sofia Kirhakos and Steidel, {Charles C.} and Schneider, {Donald P.}",

note = "Funding Information: 5IRAF is distributed by the National Optical Astronomy Observatories, which are operated by AURA, Inc., under contract to the NSF. Funding Information: Support for this work was provided by NSF grant AST 96-17185 and NASA grants NAG5-6399 and AR-07983.01-96A, the latter from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. B. T. J. acknowledges support from NOAO, which is operated by AURA, Inc., under cooperative agreement with the NSF.",

year = "1999",

month = jul,

day = "1",

doi = "10.1086/312102",

language = "English (US)",

volume = "519",

pages = "L43--L46",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1 PART 2",

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TY - JOUR

T1 - The C IV absorption-Mg II kinematics connection in 〉z〈 ∼ 0.7 galaxies

AU - Churchill, Christopher W.

AU - Mellon, Richard R.

AU - Charlton, Jane C.

AU - Jannuzi, Buell T.

AU - Kirhakos, Sofia

AU - Steidel, Charles C.

AU - Schneider, Donald P.

N1 - Funding Information: 5IRAF is distributed by the National Optical Astronomy Observatories, which are operated by AURA, Inc., under contract to the NSF. Funding Information: Support for this work was provided by NSF grant AST 96-17185 and NASA grants NAG5-6399 and AR-07983.01-96A, the latter from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. B. T. J. acknowledges support from NOAO, which is operated by AURA, Inc., under cooperative agreement with the NSF.

PY - 1999/7/1

Y1 - 1999/7/1

N2 - We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV λλ1548, 1550 absorption associated with 40 Mg II λλ2796, 2803 absorption-selected galaxies at 0.4 ≤ z ≤ 1.4. We report a strong correlation between Mg II kinematics, measured in ∼6 km s-1 resolution HIRES/Keck spectra, and Wr(1548); this implies a physical connection between the processes that produce "outlying velocity" Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition Wr(1548)/Wr(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-red shift galaxies. We find tentative evidence (2 σ) that Wr(1548)/Wr(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z ∼ 1.

AB - We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV λλ1548, 1550 absorption associated with 40 Mg II λλ2796, 2803 absorption-selected galaxies at 0.4 ≤ z ≤ 1.4. We report a strong correlation between Mg II kinematics, measured in ∼6 km s-1 resolution HIRES/Keck spectra, and Wr(1548); this implies a physical connection between the processes that produce "outlying velocity" Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition Wr(1548)/Wr(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-red shift galaxies. We find tentative evidence (2 σ) that Wr(1548)/Wr(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z ∼ 1.

KW - Galaxies: evolution

KW - Galaxies: halos

KW - Quasars: absorption lines

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U2 - 10.1086/312102

DO - 10.1086/312102

M3 - Article

AN - SCOPUS:0039164081

SN - 0004-637X

VL - 519

SP - L43-L46

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART 2

ER -

The C IV absorption-Mg II kinematics connection in 〉z〈 ∼ 0.7 galaxies

Abstract

Keywords

ASJC Scopus subject areas

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