skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: THE A2667 GIANT ARC AT z = 1.03: EVIDENCE FOR LARGE-SCALE SHOCKS AT HIGH REDSHIFT

Abstract

We present the spatially resolved emission line ratio properties of a {approx}10{sup 10} M {sub Sun} star-forming galaxy at redshift z = 1.03. This galaxy is gravitationally lensed as a triple-image giant arc behind the massive lensing cluster A2667. The main image of the galaxy has magnification factors of 14 {+-} 2.1 in flux and {approx}2 Multiplication-Sign 7 in area, yielding an intrinsic spatial resolution of 115-405 pc after adaptive optics correction with OSIRIS at KECK II. The Hubble Space Telescope morphology shows a clumpy structure and the H{alpha} kinematics indicates a large velocity dispersion with V {sub max} sin (i)/{sigma} {approx} 0.73, consistent with high-redshift disk galaxies of similar masses. From the [N II]/H{alpha} line ratios, we find that the central 350 pc of the galaxy is dominated by star formation. The [N II]/H{alpha} line ratios are higher in the outer disk than in the central regions. Most noticeably, we find a blueshifted region of strong [N II]/H{alpha} emission in the outer disk. Applying our recent H II region and slow-shock models, we propose that this elevated [N II]/H{alpha} ratio region is contaminated by a significant fraction of shock excitation due to galactic outflows. Our analysis suggests that shockedmore » regions may mimic flat or inverted metallicity gradients at high redshift.« less

Authors:
;  [1];  [2];  [3]
  1. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
  2. Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham, DH1 3LE (United Kingdom)
  3. CRAL, Observatoire de Lyon, Universite Lyon 1, 9 Avenue Ch. Andre, F-69561 Saint Genis Laval Cedex (France)
Publication Date:
OSTI Identifier:
22086445
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; CORRECTIONS; COSMOLOGY; EXCITATION; GALACTIC EVOLUTION; GALAXIES; GIANT STARS; IMAGES; MORPHOLOGY; OPTICS; PHOTON EMISSION; RED SHIFT; SPATIAL RESOLUTION; TELESCOPES

Citation Formats

Yuan, T.-T., Kewley, L. J., Swinbank, A. M., and Richard, J. THE A2667 GIANT ARC AT z = 1.03: EVIDENCE FOR LARGE-SCALE SHOCKS AT HIGH REDSHIFT. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/66.
Yuan, T.-T., Kewley, L. J., Swinbank, A. M., & Richard, J. THE A2667 GIANT ARC AT z = 1.03: EVIDENCE FOR LARGE-SCALE SHOCKS AT HIGH REDSHIFT. United States. doi:10.1088/0004-637X/759/1/66.
Yuan, T.-T., Kewley, L. J., Swinbank, A. M., and Richard, J. Thu . "THE A2667 GIANT ARC AT z = 1.03: EVIDENCE FOR LARGE-SCALE SHOCKS AT HIGH REDSHIFT". United States. doi:10.1088/0004-637X/759/1/66.
@article{osti_22086445,
title = {THE A2667 GIANT ARC AT z = 1.03: EVIDENCE FOR LARGE-SCALE SHOCKS AT HIGH REDSHIFT},
author = {Yuan, T.-T. and Kewley, L. J. and Swinbank, A. M. and Richard, J.},
abstractNote = {We present the spatially resolved emission line ratio properties of a {approx}10{sup 10} M {sub Sun} star-forming galaxy at redshift z = 1.03. This galaxy is gravitationally lensed as a triple-image giant arc behind the massive lensing cluster A2667. The main image of the galaxy has magnification factors of 14 {+-} 2.1 in flux and {approx}2 Multiplication-Sign 7 in area, yielding an intrinsic spatial resolution of 115-405 pc after adaptive optics correction with OSIRIS at KECK II. The Hubble Space Telescope morphology shows a clumpy structure and the H{alpha} kinematics indicates a large velocity dispersion with V {sub max} sin (i)/{sigma} {approx} 0.73, consistent with high-redshift disk galaxies of similar masses. From the [N II]/H{alpha} line ratios, we find that the central 350 pc of the galaxy is dominated by star formation. The [N II]/H{alpha} line ratios are higher in the outer disk than in the central regions. Most noticeably, we find a blueshifted region of strong [N II]/H{alpha} emission in the outer disk. Applying our recent H II region and slow-shock models, we propose that this elevated [N II]/H{alpha} ratio region is contaminated by a significant fraction of shock excitation due to galactic outflows. Our analysis suggests that shocked regions may mimic flat or inverted metallicity gradients at high redshift.},
doi = {10.1088/0004-637X/759/1/66},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}