The SAMI galaxy survey: can we trust aperture corrections to predict star formation?

S. N. Richards*, J. J. Bryant, S. M. Croom, A. M. Hopkins, A. L. Schaefer, J. Bland-Hawthorn, J. T. Allen, S. Brough, G. Cecil, L. Cortese, L. M. R. Fogarty, M. L. P. Gunawardhana, M. Goodwin, A. W. Green, I. T. Ho, L. J. Kewley, I. S. Konstantopoulos, J. S. Lawrence, N. P. F. Lorente, A. M. MedlingM. S. Owers, R. Sharp, S. M. Sweet, E. N. Taylor

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)
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    Abstract

    In the low-redshift Universe (z < 0.3), our view of galaxy evolution is primarily based on fibre optic spectroscopy surveys. Elaborate methods have been developed to address aperture effects when fixed aperture sizes only probe the inner regions for galaxies of ever decreasing redshift or increasing physical size. These aperture corrections rely on assumptions about the physical properties of galaxies. The adequacy of these aperture corrections can be tested with integralfield spectroscopic data. We use integral-field spectra drawn from 1212 galaxies observed as part of the SAMI Galaxy Survey to investigate the validity of two aperture correction methods that attempt to estimate a galaxy's total instantaneous star formation rate.We show that biases arise when assuming that instantaneous star formation is traced by broad-band imaging, and when the aperture correction is built only from spectra of the nuclear region of galaxies. These biases may be significant depending on the selection criteria of a survey sample. Understanding the sensitivities of these aperture corrections is essential for correct handling of systematic errors in galaxy evolution studies.

    Original languageEnglish
    Pages (from-to)2826-2838
    Number of pages13
    JournalMonthly Notices of the Royal Astronomical Society
    Volume455
    Issue number3
    DOIs
    Publication statusPublished - 21 Jan 2016

    Bibliographical note

    Erratum to article in Monthly Notices of the Royal Astronomical Society 458(2) pp. 1300. https://doi.org/10.1093/mnras/stw381

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    Keywords

    • techniques: spectroscopic
    • galaxies: evolution

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