SAMI Galaxy Survey: Spatially resolved metallicity and ionization mapping
- Creators
- Poetrodjojo, Henry
- Groves, Brent
- Kewley, Lisa J.
- Medling, Anne M.
- Sweet, Sarah M.
- van de Sande, Jesse
- Sanchez, Sebastian F.
- Bland-Hawthorn, Joss
- Brough, Sarah
- Bryant, Julia J.
- Cortese, Luca
- Croom, Scott M.
- López-Sánchez, Ángel R.
- Richards, Samuel N.
- Zafar, Tayyaba
- Lawrence, Jon S.
- Lorente, Nuria P. F.
- Owers, Matt S.
- Scott, Nicholas
Abstract
We present gas-phase metallicity and ionization parameter maps of 25 star-forming face-on spiral galaxies from the SAMI Galaxy Survey Data Release 1. Self-consistent metallicity and ionization parameter maps are calculated simultaneously through an iterative process to account for the interdependence of the strong emission line diagnostics involving ([O II]+[O III])/Hβ (R_(23)) and [O III]/[O II](O32). The maps are created on a spaxel-by-spaxel basis because H II regions are not resolved at the SAMI spatial resolution. We combine the SAMI data with stellar mass, star formation rate (SFR), effective radius (R_e), ellipticity, and position angles (PA) from the GAMA survey to analyse their relation to the metallicity and ionization parameter. We find a weak trend of steepening metallicity gradient with galaxy stellar mass, with values ranging from −0.03 to −0.20 dex/R_e. Only two galaxies show radial gradients in the ionization parameter. We find that the ionization parameter has no significant correlation with either SFR, sSFR (specific SFR), or metallicity. For several individual galaxies, we find the structure in the ionization parameter maps suggestive of spiral arm features. We find a typical ionization parameter range of 7.0 < log (q) < 7.8 for our galaxy sample with no significant overall structure. An ionization parameter range of this magnitude is large enough to caution the use of metallicity diagnostics that have not considered the effects of a varying ionization parameter distribution.
Additional Information
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/about_us/legal/notices). Accepted 2018 July 3. Received 2018 July 1; in original form 2018 April 5. Published: 05 July 2018. The SAMI Galaxy Survey is based on observations made at the Anglo-Australian Telescope. The Sydney-AAO Multi-object Integral field spectrograph (SAMI) was developed jointly by the University of Sydney and the Australian Astronomical Observatory. The SAMI input catalogue is based on data taken from the Sloan Digital Sky Survey, the GAMA Survey, and the VST ATLAS Survey. The SAMI Galaxy Survey is funded by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020, and other participating institutions. The SAMI Galaxy Survey website is http://sami-survey.org/. Parts of this research were conducted by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. BG gratefully acknowledges the support of the Australian Research Council as the recipient of a Future Fellowship (FT140101202). Support for AMM is provided by NASA through Hubble Fellowship grant #HST-HF2-51377 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. JvdS is funded under Bland-Hawthorn's ARC Laureate Fellowship (FL140100278). SFS thanks CONACYT programmes CB-285080 and DGAPA-PAPIIT IA101217 grants for their support to this project. SB acknowledges the funding support from the Australian Research Council through a Future Fellowship (FT140101166). MSO acknowledges the funding support from the Australian Research Council through a Future Fellowship (FT140100255). NS acknowledges support of a University of Sydney Postdoctoral Research Fellowship.Attached Files
Published - sty1782.pdf
Accepted Version - 1807.01522.pdf
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Additional details
- Eprint ID
- 89284
- Resolver ID
- CaltechAUTHORS:20180829-141806354
- CE110001020
- Australian Research Council
- CE170100013
- Australian Research Council
- FT140101202
- Australian Research Council
- HST-HF2-51377
- NASA Hubble Fellowship
- NAS5-26555
- NASA
- FL140100278
- Australian Research Council
- CB-285080
- Consejo Nacional de Ciencia y Tecnología (CONACYT)
- IA101217
- Universidad Nacional Autónoma de México
- FT140101166
- Australian Research Council
- FT140100255
- Australian Research Council
- University of Sydney
- Created
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2018-08-29Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field