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SAMI Galaxy Survey: Spatially resolved metallicity and ionization mapping

Poetrodjojo, Henry and Groves, Brent and Kewley, Lisa J. and Medling, Anne M. and Sweet, Sarah M. and van de Sande, Jesse and Sanchez, Sebastian F. and Bland-Hawthorn, Joss and Brough, Sarah and Bryant, Julia J. and Cortese, Luca and Croom, Scott M. and López-Sánchez, Ángel R. and Richards, Samuel N. and Zafar, Tayyaba and Lawrence, Jon S. and Lorente, Nuria P. F. and Owers, Matt S. and Scott, Nicholas (2018) SAMI Galaxy Survey: Spatially resolved metallicity and ionization mapping. Monthly Notices of the Royal Astronomical Society, 479 (4). pp. 5235-5265. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20180829-141806354

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/sty1782DOIArticle
https://arxiv.org/abs/1807.01522arXivDiscussion Paper
ORCID:
AuthorORCID
Poetrodjojo, Henry0000-0001-5843-132X
Groves, Brent0000-0002-9768-0246
Kewley, Lisa J.0000-0001-8152-3943
Medling, Anne M.0000-0001-7421-2944
Sweet, Sarah M.0000-0002-1576-2505
van de Sande, Jesse0000-0003-2552-0021
Bland-Hawthorn, Joss0000-0001-7516-4016
Brough, Sarah0000-0002-9796-1363
Bryant, Julia J.0000-0003-1627-9301
Cortese, Luca0000-0002-7422-9823
Croom, Scott M.0000-0003-2880-9197
Richards, Samuel N.0000-0002-5368-0068
Zafar, Tayyaba0000-0003-3935-7018
Lorente, Nuria P. F.0000-0003-0450-4807
Scott, Nicholas0000-0001-8495-8547
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.
Funders:
Funding AgencyGrant Number
Australian Research CouncilCE110001020
Australian Research CouncilCE170100013
Australian Research CouncilFT140101202
NASA Hubble FellowshipHST-HF2-51377
NASANAS5-26555
Australian Research CouncilFL140100278
Consejo Nacional de Ciencia y Tecnología (CONACYT)CB-285080
Universidad Nacional Autónoma de MéxicoIA101217
Australian Research CouncilFT140101166
Australian Research CouncilFT140100255
University of SydneyUNSPECIFIED
Subject Keywords:galaxies: abundances – galaxies: ISM
Record Number:CaltechAUTHORS:20180829-141806354
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180829-141806354
Official Citation:Henry Poetrodjojo, Brent Groves, Lisa J Kewley, Anne M Medling, Sarah M Sweet, Jesse van de Sande, Sebastian F Sanchez, Joss Bland-Hawthorn, Sarah Brough, Julia J Bryant, Luca Cortese, Scott M Croom, Ángel R López-Sánchez, Samuel N Richards, Tayyaba Zafar, Jon S Lawrence, Nuria P F Lorente, Matt S Owers, Nicholas Scott; The SAMI Galaxy Survey: Spatially resolved metallicity and ionization mapping, Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 4, 1 October 2018, Pages 5235–5265, https://doi.org/10.1093/mnras/sty1782
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89284
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Aug 2018 23:34
Last Modified:22 Mar 2019 19:19

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