AustralieFrV1, Main, Exploration, bibRecord, 005872

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

Identifieur interne : 005872 ( Main/Exploration ); précédent : 005871; suivant : 005873

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

Auteurs : T.-T. Yuan [États-Unis] ; L. J. Kewley [États-Unis, Australie] ; A. M. Swinbank [Royaume-Uni] ; J. Richard [France]

Source :

The Astrophysical journal [ 0004-637X ] ; 2012.

RBID : Pascal:12-0435163

Descripteurs français

Pascal (Inist)
- Déplacement vers le rouge, Raie émission, Etoile M, Galaxies disques, Optique adaptative, Correction, Observatoire spatial, Morphologie, Cinématique, Dispersion vitesse, Raie H alpha, Formation stellaire, Déplacement vers le bleu, Région HII, Modèle, Excitation, Métallicité, Abondance, Evolution galaxies, Mirage gravitationnel, Jet.

English descriptors

KwdEn :
- Abundance, Adaptive optics, Blue shift, Corrections, Disk galaxies, Emission line, Excitation, Galaxy evolution, Gravitational lensing, H-alpha lines, HII regions, Jets, Kinematics, M stars, Metallicity, Models, Morphology, Red shift, Spatial observatory, Star formation, Velocity dispersion.

Abstract

We present the spatially resolved emission line ratio properties of a ∼10¹⁰ M_◦. 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 ∼2 x 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 Hα kinematics indicates a large velocity dispersion with V_maxsin (i)/σ ∼ 0.73, consistent with high-redshift disk galaxies of similar masses. From the [N II]/Hα line ratios, we find that the central 350 pc of the galaxy is dominated by star formation. The [N n]/Ha line ratios are higher in the outer disk than in the central regions. Most noticeably, we find a blueshifted region of strong [N II]/Hα emission in the outer disk. Applying our recent H II region and slow-shock models, we propose that this elevated [N II]/Hα 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.

Affiliations:

Australie, France, Royaume-Uni, États-Unis

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Le document en format XML

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<front><div type="abstract" xml:lang="en">We present the spatially resolved emission line ratio properties of a ∼10<sup>10</sup>
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THE A2667 GIANT ARC AT z = 1.03: EVIDENCE FOR LARGE-SCALE SHOCKS AT HIGH REDSHIFT

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

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri