0.1<z<0.8 galaxies gas-phase metallicity grad. Virtual Observatory Resource

Authors
  1. Carton D.
  2. Brinchmann J.
  3. Contini T.
  4. Epinat B.
  5. Finley H.
  6. Richard J.,Patricio V.
  7. Schaye J.
  8. Nanayakkara T.
  9. Weilbacher P.M.
  10. Wisotzki
  11. Published by
    CDS
Abstract

Galaxies at low-redshift typically possess negative gas-phase metallicity gradients (centres more metal-rich than their outskirts). Whereas, it is not uncommon to observe positive metallicity gradients in higher-redshift galaxies (z<0.6). Bridging these epochs, we present gas-phase metallicity gradients of 84 star-forming galaxies between 0.08<z<0.84. Using the galaxies with reliably determined metallicity gradients, we measure the median metallicity gradient to be negative (-0.039^+0.007^_-0.009_dex/kpc). Underlying this, however, is significant scatter: (8+/-3)% [7] of galaxies have significantly positive metallicity gradients, (38+/-5)% [32] have significantly negative gradients, (31+/-5)% [26] have gradients consistent with being flat. (The remaining (23+/-5)% [19] have unreliable gradient estimates.) We notice a slight trend for a more negative metallicity gradient with both increasing stellar mass and increasing star formation rate (SFR). However, given the potential redshift and size selection effects, we do not consider these trends to be significant. Indeed, once we normalize the SFR relative to that of the main sequence, we do not observe any trend between the metallicity gradient and the normalized SFR. This is contrary to recent studies of galaxies at similar and higher redshifts. We do, however, identify a novel trend between the metallicity gradient of a galaxy and its size. Small galaxies (rd<3kpc) present a large spread in observed metallicity gradients (both negative and positive gradients). In contrast, we find no large galaxies (rd > 3 kpc) with positive metallicity gradients, and overall there is less scatter in the metallicity gradient amongst the large galaxies. These large (well-evolved) galaxies may be analogues of present-day galaxies, which also show a common negative metallicity gradient.

Keywords
  1. galaxies
  2. catalogs
  3. chemical-abundances
  4. redshifted
  5. interstellar-medium
Bibliographic source Bibcode
2018MNRAS.478.4293C
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/478/4293
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/478/4293
Document Object Identifer DOI
doi:10.26093/cds/vizier.74784293

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/478/4293
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/478/4293
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/478/4293
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For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/478/4293/tablea1?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/478/4293/tablea1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/478/4293/tablea1?

History

2018-07-05T08:05:25Z
Resource record created
2018-07-05T08:05:25Z
Created
2024-08-18T20:20:07Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr