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

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

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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 logM*/M > 11, the fraction of slow rotators is 35.9 ± 4.3 per cent, but is underestimated if galaxies without coverage beyond one R e 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.

Original languageEnglish
Pages (from-to)1272-1285
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume472
Issue number2
DOIs
Publication statusPublished - 2017 Jan 1

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spectrographs
apertures
galaxies
kinematics
profiles
growth curve
spectroscopy
linear transformations
radii
internal pressure
galactic evolution
point spread functions
stellar mass
polynomials
curves
parameter

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

van de Sande, Jesse ; Bland-Hawthorn, Joss ; Brough, Sarah ; Croom, Scott M. ; Cortese, Luca ; Foster, Caroline ; Scott, Nicholas ; Bryant, Julia J. ; d'Eugenio, Francesco ; Tonini, Chiara ; Goodwin, Michael ; Konstantopoulos, Iraklis S. ; Lawrence, Jon S. ; Medling, Anne M. ; Owers, Matt S. ; Richards, Samuel N. ; Schaefer, Adam L. ; Yi, Sukyoung K. / The SAMI Galaxy Survey : Revising the fraction of slow rotators in IFS galaxy surveys. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 472, No. 2. pp. 1272-1285.
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abstract = "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 logM*/M ⊙ > 11, the fraction of slow rotators is 35.9 ± 4.3 per cent, but is underestimated if galaxies without coverage beyond one R e 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.",
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van de Sande, J, Bland-Hawthorn, J, Brough, S, Croom, SM, Cortese, L, Foster, C, Scott, N, Bryant, JJ, d'Eugenio, F, Tonini, C, Goodwin, M, Konstantopoulos, IS, Lawrence, JS, Medling, AM, Owers, MS, Richards, SN, Schaefer, AL & Yi, SK 2017, 'The SAMI Galaxy Survey: Revising the fraction of slow rotators in IFS galaxy surveys', Monthly Notices of the Royal Astronomical Society, vol. 472, no. 2, pp. 1272-1285. https://doi.org/10.1093/mnras/stx1751

The SAMI Galaxy Survey : Revising the fraction of slow rotators in IFS galaxy surveys. / van de Sande, Jesse; Bland-Hawthorn, Joss; Brough, Sarah; Croom, Scott M.; Cortese, Luca; Foster, Caroline; Scott, Nicholas; Bryant, Julia J.; d'Eugenio, Francesco; Tonini, Chiara; Goodwin, Michael; Konstantopoulos, Iraklis S.; Lawrence, Jon S.; Medling, Anne M.; Owers, Matt S.; Richards, Samuel N.; Schaefer, Adam L.; Yi, Sukyoung K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 472, No. 2, 01.01.2017, p. 1272-1285.

Research output: Contribution to journalArticle

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T2 - Revising the fraction of slow rotators in IFS galaxy surveys

AU - van de Sande, Jesse

AU - Bland-Hawthorn, Joss

AU - Brough, Sarah

AU - Croom, Scott M.

AU - Cortese, Luca

AU - Foster, Caroline

AU - Scott, Nicholas

AU - Bryant, Julia J.

AU - d'Eugenio, Francesco

AU - Tonini, Chiara

AU - Goodwin, Michael

AU - Konstantopoulos, Iraklis S.

AU - Lawrence, Jon S.

AU - Medling, Anne M.

AU - Owers, Matt S.

AU - Richards, Samuel N.

AU - Schaefer, Adam L.

AU - Yi, Sukyoung K.

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N2 - 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 logM*/M ⊙ > 11, the fraction of slow rotators is 35.9 ± 4.3 per cent, but is underestimated if galaxies without coverage beyond one R e 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.

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van de Sande J, Bland-Hawthorn J, Brough S, Croom SM, Cortese L, Foster C et al. The SAMI Galaxy Survey: Revising the fraction of slow rotators in IFS galaxy surveys. Monthly Notices of the Royal Astronomical Society. 2017 Jan 1;472(2):1272-1285. https://doi.org/10.1093/mnras/stx1751