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The SAMI Galaxy Survey: revising the fraction of slow rotators in IFS galaxy surveys

van de Sande, Jesse and Bland-Hawthorn, Joss and Brough, Sarah and Croom, Scott M. and Cortese, Luca and Foster, Caroline and Scott, Nicholas and Bryant, Julia J. and d'Eugenio, Francesco and Tonini, Chiara and Goodwin, Michael and Konstantopoulos, Iraklis S. and Lawrence, Jon S. and Medling, Anne M. and Owers, Matt S. and Richards, Samuel N. and Schaefer, Adam L. and Yi, Sukyoung K. (2017) The SAMI Galaxy Survey: revising the fraction of slow rotators in IFS galaxy surveys. Monthly Notices of the Royal Astronomical Society, 472 (2). pp. 1272-1285. ISSN 0035-8711.

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The fraction of galaxies supported by internal rotation compared to galaxies stabilized by internal pressure provides a strong constraint on galaxy formation models. In integral field spectroscopy surveys, this fraction is biased because survey instruments typically only trace the inner parts of the most massive galaxies. We present aperture corrections for the two most widely used stellar kinematic quantities V/σ and λ_R (spin parameter proxy). Our demonstration involves integral field data from the SAMI (Sydney-AAO Multi-object Integral-field spectrograph) Galaxy Survey and the ATLAS^(3D) survey. We find a tight relation for both V/σ and λ_R when measured in different apertures that can be used as a linear transformation as a function of radius, i.e. a first-order aperture correction. In degraded seeing, however, the aperture corrections are more significant as the steeper inner profile is more strongly affected by the point spread function than the outskirts. We find that V/σ and λ_R radial growth curves are well approximated by second-order polynomials. By only fitting the inner profile (0.5R_e), we successfully recover the profile out to one R_e if a constraint between the linear and quadratic parameter in the fit is applied. However, the aperture corrections for V/σ and λ_R derived by extrapolating the profiles perform as well as applying a first-order correction. With our aperture-corrected λ_R measurements, we find that the fraction of slow rotating galaxies increases with stellar mass. For galaxies with log M*/M⊙ > 11, the fraction of slow rotators is 35.9 ± 4.3 per cent, but is underestimated if galaxies without coverage beyond one Re are not included in the sample (24.2 ± 5.3 per cent). With measurements out to the largest aperture radius, the slow rotator fraction is similar as compared to using aperture-corrected values (38.3 ± 4.4 per cent). Thus, aperture effects can significantly bias stellar kinematic integral field spectrograph studies, but this bias can now be removed with the method outlined here.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
van de Sande, Jesse0000-0003-2552-0021
Bland-Hawthorn, Joss0000-0001-7516-4016
Brough, Sarah0000-0002-9796-1363
Croom, Scott M.0000-0003-2880-9197
Cortese, Luca0000-0002-7422-9823
Foster, Caroline0000-0003-0247-1204
Scott, Nicholas0000-0001-8495-8547
Bryant, Julia J.0000-0003-1627-9301
Konstantopoulos, Iraklis S.0000-0003-2177-0146
Medling, Anne M.0000-0001-7421-2944
Owers, Matt S.0000-0002-2879-1663
Richards, Samuel N.0000-0002-5368-0068
Additional Information:© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 July 7. Received 2017 July 7; in original form 2017 June 9. Published: 13 July 2017. We thank the anonymous referee for the very constructive comments that improved the quality of the paper. 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, and funded by ARC grants FF0776384 (Bland-Hawthorn) and LE130100198. JvdS is funded under Bland-Hawthorn's ARC Laureate Fellowship (FL140100278). 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). 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. S.K.Y. acknowledges support from the Korean National Research Foundation (NRF-2017R1A2A1A05001116) and Yonsei University Future-leading Research Initiative of 2015 (RMS2 2015-22-0064). 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 GAMA is a joint European-Australasian project based around a spectroscopic campaign using the Anglo-Australian Telescope. The GAMA input catalogue is based on data taken from the Sloan Digital Sky Survey and the UKIRT Infrared Deep Sky Survey. Complementary imaging of the GAMA regions is being obtained by a number of independent survey programmes including GALEX MIS, VST KiDS, VISTA VIKING, WISE, Herschel-ATLAS, GMRT and ASKAP providing UV-to-radio coverage. GAMA is funded by the STFC (UK), the ARC (Australia), the AAO and the participating institutions. The GAMA website is Based on data products (VST/ATLAS) from observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 177.A-3011(A,B,C). Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation and the US Department of Energy Office of Science. The SDSS-III website is
Funding AgencyGrant Number
Australian Research CouncilFF0776384
Australian Research CouncilLE130100198
Australian Research CouncilFL140100278
Australian Research CouncilFT140101166
Australian Research CouncilFT140100255
NASA Hubble FellowshipHST-HF2-51377
National Research Foundation of KoreaNRF-2017R1A2A1A05001116
Yonsei UniversityRMS2 2015-22-0064
Australian Research CouncilCE110001020
Alfred P. Sloan FoundationUNSPECIFIED
Participating InstitutionsUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:galaxies: evolution – galaxies: formation – galaxies: kinematics and dynamics – galaxies: stellar content – galaxies: structure – cosmology: observations
Issue or Number:2
Record Number:CaltechAUTHORS:20171102-124840060
Persistent URL:
Official Citation:Jesse van de Sande, Joss Bland-Hawthorn, Sarah Brough, Scott M. Croom, Luca Cortese, Caroline Foster, Nicholas Scott, Julia J. Bryant, Francesco d'Eugenio, Chiara Tonini, Michael Goodwin, Iraklis S. Konstantopoulos, Jon S. Lawrence, Anne M. Medling, Matt S. Owers, Samuel N. Richards, Adam L. Schaefer, Sukyoung K. Yi; The SAMI Galaxy Survey: revising the fraction of slow rotators in IFS galaxy surveys, Monthly Notices of the Royal Astronomical Society, Volume 472, Issue 2, 1 December 2017, Pages 1272–1285,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82899
Deposited By: Tony Diaz
Deposited On:02 Nov 2017 20:14
Last Modified:04 Nov 2019 00:50

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