THE SAMI GALAXY SURVEY: REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS

Jesse Van De Sande, Joss Bland-Hawthorn, Lisa M.R. Fogarty, Luca Cortese, Francesco D'Eugenio, Scott M. Croom, Nicholas Scott, James T. Allen, Sarah Brough, Julia J. Bryant, Gerald Cecil, Matthew Colless, Warrick J. Couch, Roger Davies, Pascal J. Elahi, Caroline Foster, Gregory Goldstein, Michael Goodwin, Brent Groves, I. Ting HoHyunjin Jeong, D. Heath Jones, Iraklis S. Konstantopoulos, Jon S. Lawrence, Sarah K. Leslie, Ángel R. López-Sánchez, Richard M. McDermid, Rebecca McElroy, Anne M. Medling, Sree Oh, Matt S. Owers, Samuel N. Richards, Adam L. Schaefer, Rob Sharp, Sarah M. Sweet, Dan Taranu, Chiara Tonini, C. Jakob Walcher, Sukyoung Yi

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Recent cosmological hydrodynamical simulations suggest that integral field spectroscopy can connect the high-order stellar kinematic moments h 3 (∼skewness) and h 4 (∼kurtosis) in galaxies to their cosmological assembly history. Here, we assess these results by measuring the stellar kinematics on a sample of 315 galaxies, without a morphological selection, using two-dimensional integral field data from the SAMI Galaxy Survey. Proxies for the spin parameter (λ Re ) and ellipticity (∈ e ) are used to separate fast and slow rotators; there exists a good correspondence to regular and non-regular rotators, respectively, as also seen in earlier studies. We confirm that regular rotators show a strong h 3 versus V/σ anti-correlation, whereas quasi-regular and non-regular rotators show a more vertical relation in h 3 and V/σ. Motivated by recent cosmological simulations, we develop an alternative approach to kinematically classify galaxies from their individual h 3 versus V/σ signatures. Within the SAMI Galaxy Survey, we identify five classes of high-order stellar kinematic signatures using Gaussian mixture models. Class 1 corresponds to slow rotators, whereas Classes 2-5 correspond to fast rotators. We find that galaxies with similar λ Re - ∈ e values can show distinctly different h 3 - V/σ signatures. Class 5 objects are previously unidentified fast rotators that show a weak h 3 versus V/σ anti-correlation. From simulations, these objects are predicted to be disk-less galaxies formed by gas-poor mergers. From morphological examination, however, there is evidence for large stellar disks. Instead, Class 5 objects are more likely disturbed galaxies, have counter-rotating bulges, or bars in edge-on galaxies. Finally, we interpret the strong anti-correlation in h 3 versus V/σ as evidence for disks in most fast rotators, suggesting a dearth of gas-poor mergers among fast rotators.

Original languageEnglish
Article number104
JournalAstrophysical Journal
Volume835
Issue number1
DOIs
Publication statusPublished - 2017 Jan 20

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kinematics
galaxies
merger
simulation
skewness
gas
spectroscopy
signatures
history
kurtosis
ellipticity
gases
counters
assembly
examination
histories
moments
measuring
parameter

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Van De Sande, J., Bland-Hawthorn, J., Fogarty, L. M. R., Cortese, L., D'Eugenio, F., Croom, S. M., ... Yi, S. (2017). THE SAMI GALAXY SURVEY: REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS. Astrophysical Journal, 835(1), [104]. https://doi.org/10.3847/1538-4357/835/1/104
Van De Sande, Jesse ; Bland-Hawthorn, Joss ; Fogarty, Lisa M.R. ; Cortese, Luca ; D'Eugenio, Francesco ; Croom, Scott M. ; Scott, Nicholas ; Allen, James T. ; Brough, Sarah ; Bryant, Julia J. ; Cecil, Gerald ; Colless, Matthew ; Couch, Warrick J. ; Davies, Roger ; Elahi, Pascal J. ; Foster, Caroline ; Goldstein, Gregory ; Goodwin, Michael ; Groves, Brent ; Ho, I. Ting ; Jeong, Hyunjin ; Jones, D. Heath ; Konstantopoulos, Iraklis S. ; Lawrence, Jon S. ; Leslie, Sarah K. ; López-Sánchez, Ángel R. ; McDermid, Richard M. ; McElroy, Rebecca ; Medling, Anne M. ; Oh, Sree ; Owers, Matt S. ; Richards, Samuel N. ; Schaefer, Adam L. ; Sharp, Rob ; Sweet, Sarah M. ; Taranu, Dan ; Tonini, Chiara ; Walcher, C. Jakob ; Yi, Sukyoung. / THE SAMI GALAXY SURVEY : REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS. In: Astrophysical Journal. 2017 ; Vol. 835, No. 1.
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abstract = "Recent cosmological hydrodynamical simulations suggest that integral field spectroscopy can connect the high-order stellar kinematic moments h 3 (∼skewness) and h 4 (∼kurtosis) in galaxies to their cosmological assembly history. Here, we assess these results by measuring the stellar kinematics on a sample of 315 galaxies, without a morphological selection, using two-dimensional integral field data from the SAMI Galaxy Survey. Proxies for the spin parameter (λ Re ) and ellipticity (∈ e ) are used to separate fast and slow rotators; there exists a good correspondence to regular and non-regular rotators, respectively, as also seen in earlier studies. We confirm that regular rotators show a strong h 3 versus V/σ anti-correlation, whereas quasi-regular and non-regular rotators show a more vertical relation in h 3 and V/σ. Motivated by recent cosmological simulations, we develop an alternative approach to kinematically classify galaxies from their individual h 3 versus V/σ signatures. Within the SAMI Galaxy Survey, we identify five classes of high-order stellar kinematic signatures using Gaussian mixture models. Class 1 corresponds to slow rotators, whereas Classes 2-5 correspond to fast rotators. We find that galaxies with similar λ Re - ∈ e values can show distinctly different h 3 - V/σ signatures. Class 5 objects are previously unidentified fast rotators that show a weak h 3 versus V/σ anti-correlation. From simulations, these objects are predicted to be disk-less galaxies formed by gas-poor mergers. From morphological examination, however, there is evidence for large stellar disks. Instead, Class 5 objects are more likely disturbed galaxies, have counter-rotating bulges, or bars in edge-on galaxies. Finally, we interpret the strong anti-correlation in h 3 versus V/σ as evidence for disks in most fast rotators, suggesting a dearth of gas-poor mergers among fast rotators.",
author = "{Van De Sande}, Jesse and Joss Bland-Hawthorn and Fogarty, {Lisa M.R.} and Luca Cortese and Francesco D'Eugenio and Croom, {Scott M.} and Nicholas Scott and Allen, {James T.} and Sarah Brough and Bryant, {Julia J.} and Gerald Cecil and Matthew Colless and Couch, {Warrick J.} and Roger Davies and Elahi, {Pascal J.} and Caroline Foster and Gregory Goldstein and Michael Goodwin and Brent Groves and Ho, {I. Ting} and Hyunjin Jeong and Jones, {D. Heath} and Konstantopoulos, {Iraklis S.} and Lawrence, {Jon S.} and Leslie, {Sarah K.} and L{\'o}pez-S{\'a}nchez, {{\'A}ngel R.} and McDermid, {Richard M.} and Rebecca McElroy and Medling, {Anne M.} and Sree Oh and Owers, {Matt S.} and Richards, {Samuel N.} and Schaefer, {Adam L.} and Rob Sharp and Sweet, {Sarah M.} and Dan Taranu and Chiara Tonini and Walcher, {C. Jakob} and Sukyoung Yi",
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Van De Sande, J, Bland-Hawthorn, J, Fogarty, LMR, Cortese, L, D'Eugenio, F, Croom, SM, Scott, N, Allen, JT, Brough, S, Bryant, JJ, Cecil, G, Colless, M, Couch, WJ, Davies, R, Elahi, PJ, Foster, C, Goldstein, G, Goodwin, M, Groves, B, Ho, IT, Jeong, H, Jones, DH, Konstantopoulos, IS, Lawrence, JS, Leslie, SK, López-Sánchez, ÁR, McDermid, RM, McElroy, R, Medling, AM, Oh, S, Owers, MS, Richards, SN, Schaefer, AL, Sharp, R, Sweet, SM, Taranu, D, Tonini, C, Walcher, CJ & Yi, S 2017, 'THE SAMI GALAXY SURVEY: REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS', Astrophysical Journal, vol. 835, no. 1, 104. https://doi.org/10.3847/1538-4357/835/1/104

THE SAMI GALAXY SURVEY : REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS. / Van De Sande, Jesse; Bland-Hawthorn, Joss; Fogarty, Lisa M.R.; Cortese, Luca; D'Eugenio, Francesco; Croom, Scott M.; Scott, Nicholas; Allen, James T.; Brough, Sarah; Bryant, Julia J.; Cecil, Gerald; Colless, Matthew; Couch, Warrick J.; Davies, Roger; Elahi, Pascal J.; Foster, Caroline; Goldstein, Gregory; Goodwin, Michael; Groves, Brent; Ho, I. Ting; Jeong, Hyunjin; Jones, D. Heath; Konstantopoulos, Iraklis S.; Lawrence, Jon S.; Leslie, Sarah K.; López-Sánchez, Ángel R.; McDermid, Richard M.; McElroy, Rebecca; Medling, Anne M.; Oh, Sree; Owers, Matt S.; Richards, Samuel N.; Schaefer, Adam L.; Sharp, Rob; Sweet, Sarah M.; Taranu, Dan; Tonini, Chiara; Walcher, C. Jakob; Yi, Sukyoung.

In: Astrophysical Journal, Vol. 835, No. 1, 104, 20.01.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - THE SAMI GALAXY SURVEY

T2 - REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS

AU - Van De Sande, Jesse

AU - Bland-Hawthorn, Joss

AU - Fogarty, Lisa M.R.

AU - Cortese, Luca

AU - D'Eugenio, Francesco

AU - Croom, Scott M.

AU - Scott, Nicholas

AU - Allen, James T.

AU - Brough, Sarah

AU - Bryant, Julia J.

AU - Cecil, Gerald

AU - Colless, Matthew

AU - Couch, Warrick J.

AU - Davies, Roger

AU - Elahi, Pascal J.

AU - Foster, Caroline

AU - Goldstein, Gregory

AU - Goodwin, Michael

AU - Groves, Brent

AU - Ho, I. Ting

AU - Jeong, Hyunjin

AU - Jones, D. Heath

AU - Konstantopoulos, Iraklis S.

AU - Lawrence, Jon S.

AU - Leslie, Sarah K.

AU - López-Sánchez, Ángel R.

AU - McDermid, Richard M.

AU - McElroy, Rebecca

AU - Medling, Anne M.

AU - Oh, Sree

AU - Owers, Matt S.

AU - Richards, Samuel N.

AU - Schaefer, Adam L.

AU - Sharp, Rob

AU - Sweet, Sarah M.

AU - Taranu, Dan

AU - Tonini, Chiara

AU - Walcher, C. Jakob

AU - Yi, Sukyoung

PY - 2017/1/20

Y1 - 2017/1/20

N2 - Recent cosmological hydrodynamical simulations suggest that integral field spectroscopy can connect the high-order stellar kinematic moments h 3 (∼skewness) and h 4 (∼kurtosis) in galaxies to their cosmological assembly history. Here, we assess these results by measuring the stellar kinematics on a sample of 315 galaxies, without a morphological selection, using two-dimensional integral field data from the SAMI Galaxy Survey. Proxies for the spin parameter (λ Re ) and ellipticity (∈ e ) are used to separate fast and slow rotators; there exists a good correspondence to regular and non-regular rotators, respectively, as also seen in earlier studies. We confirm that regular rotators show a strong h 3 versus V/σ anti-correlation, whereas quasi-regular and non-regular rotators show a more vertical relation in h 3 and V/σ. Motivated by recent cosmological simulations, we develop an alternative approach to kinematically classify galaxies from their individual h 3 versus V/σ signatures. Within the SAMI Galaxy Survey, we identify five classes of high-order stellar kinematic signatures using Gaussian mixture models. Class 1 corresponds to slow rotators, whereas Classes 2-5 correspond to fast rotators. We find that galaxies with similar λ Re - ∈ e values can show distinctly different h 3 - V/σ signatures. Class 5 objects are previously unidentified fast rotators that show a weak h 3 versus V/σ anti-correlation. From simulations, these objects are predicted to be disk-less galaxies formed by gas-poor mergers. From morphological examination, however, there is evidence for large stellar disks. Instead, Class 5 objects are more likely disturbed galaxies, have counter-rotating bulges, or bars in edge-on galaxies. Finally, we interpret the strong anti-correlation in h 3 versus V/σ as evidence for disks in most fast rotators, suggesting a dearth of gas-poor mergers among fast rotators.

AB - Recent cosmological hydrodynamical simulations suggest that integral field spectroscopy can connect the high-order stellar kinematic moments h 3 (∼skewness) and h 4 (∼kurtosis) in galaxies to their cosmological assembly history. Here, we assess these results by measuring the stellar kinematics on a sample of 315 galaxies, without a morphological selection, using two-dimensional integral field data from the SAMI Galaxy Survey. Proxies for the spin parameter (λ Re ) and ellipticity (∈ e ) are used to separate fast and slow rotators; there exists a good correspondence to regular and non-regular rotators, respectively, as also seen in earlier studies. We confirm that regular rotators show a strong h 3 versus V/σ anti-correlation, whereas quasi-regular and non-regular rotators show a more vertical relation in h 3 and V/σ. Motivated by recent cosmological simulations, we develop an alternative approach to kinematically classify galaxies from their individual h 3 versus V/σ signatures. Within the SAMI Galaxy Survey, we identify five classes of high-order stellar kinematic signatures using Gaussian mixture models. Class 1 corresponds to slow rotators, whereas Classes 2-5 correspond to fast rotators. We find that galaxies with similar λ Re - ∈ e values can show distinctly different h 3 - V/σ signatures. Class 5 objects are previously unidentified fast rotators that show a weak h 3 versus V/σ anti-correlation. From simulations, these objects are predicted to be disk-less galaxies formed by gas-poor mergers. From morphological examination, however, there is evidence for large stellar disks. Instead, Class 5 objects are more likely disturbed galaxies, have counter-rotating bulges, or bars in edge-on galaxies. Finally, we interpret the strong anti-correlation in h 3 versus V/σ as evidence for disks in most fast rotators, suggesting a dearth of gas-poor mergers among fast rotators.

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Van De Sande J, Bland-Hawthorn J, Fogarty LMR, Cortese L, D'Eugenio F, Croom SM et al. THE SAMI GALAXY SURVEY: REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS. Astrophysical Journal. 2017 Jan 20;835(1). 104. https://doi.org/10.3847/1538-4357/835/1/104