The SAMI Galaxy Survey: gas streaming and dynamical M/L in rotationally supported systems

G. Cecil; L. M. R. Fogarty; S. Richards; J. Bland-Hawthorn; R. Lange; A. Moffett; B. Catinella; L. Cortese; I. -T. Ho; E. N. Taylor; J. J. Bryant; J. T. Allen; S. M. Sweet; S. M. Croom; S. P. Driver; M. Goodwin; L. Kelvin; A. W. Green; I. S. Konstantopoulos; M. S. Owers; J. S. Lawrence; N. P. F. Lorente

doi:10.1093/mnras/stv2643

The SAMI Galaxy Survey: gas streaming and dynamical M/L in rotationally supported systems

G. Cecil, L. M. R. Fogarty, S. Richards, J. Bland-Hawthorn, R. Lange, A. Moffett, B. Catinella, L. Cortese, I. -T. Ho, E. N. Taylor, J. J. Bryant, J. T. Allen, S. M. Sweet, S. M. Croom, S. P. Driver, M. Goodwin, L. Kelvin, A. W. Green, I. S. Konstantopoulos, M. S. OwersJ. S. Lawrence, N. P. F. Lorente

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Line-of-sight velocities of gas and stars can constrain dark matter (DM) within rotationally supported galaxies if they trace circular orbits extensively. Photometric asymmetries may signify non-circular motions, requiring spectra with dense spatial coverage. Our integral-field spectroscopy of 178 galaxies spanned the mass range of the Sydney-AAO Multi-object integral field spectrograph (SAMI) Galaxy Survey. We derived circular speed curves (CSCs) of gas and stars from non-parametric fits out to r ∼ 2r_e. For 12/14 with measured H i profiles, ionized gas and H i maximum velocities agreed. We fitted mass-follows-light models to 163 galaxies by approximating the radial light profile as nested, very flattened mass homeoids viewed as a Sérsic form. Fitting broad-band spectral energy distributions to Sloan Digital Sky Survey images gave median stellar mass/light 1.7 assuming a Kroupa initial mass function (IMF) versus 2.6 dynamically. Two-thirds of the dynamical mass/light measures were consistent with star+remnant IMFs. One-fifth required upscaled starlight to fit, hence comparable mass of unobserved baryons and/or DM distributed like starlight across the SAMI aperture that came to dominate motions as the starlight CSCs declined rapidly. The rest had mass distributed differently from light. Subtracting fits of Sérsic radial profiles to 13 VIKING Z-band images revealed residual weak bars. Near the bar major axis, we assessed m = 2 streaming velocities, and found deviations usually <30 km s⁻¹ from the CSC; three showed no deviation. Thus, asymmetries rarely influenced the CSC despite colocated shock-indicating, emission-line flux ratios in more than 2/3 of our sample.

Original language	English
Pages (from-to)	1299-1319
Journal	Monthly Notices of the Royal Astronomical Society
Volume	456
Issue number	2
Early online date	22 Dec 2015
DOIs	https://doi.org/10.1093/mnras/stv2643
Publication status	Published - 21 Feb 2016

Keywords

Galaxies: kinematics and dynamics
Galaxies: spiral
Galaxies: structure

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10.1093/mnras/stv2643

Cecil-2015-SAMI-MNRAS-1299
© 2016, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stv2643
Final published version, 5.29 MB

SAMI Galaxy Survey
Bryant, J. J. (Creator), Owers, M. S. (Creator), Robotham, A. S. G. (Creator), Croom, S. M. (Creator), Driver, S. P. (Creator), Drinkwater, M. J. (Creator), Lorente, N. P. F. (Creator), Cortese, L. (Creator), Scott, N. (Creator), Colless, M. (Creator), Schaefer, A. (Creator), Taylor, E. N. (Creator), Konstantopoulos, I. S. (Creator), Allen, J. T. (Creator), Baldry, I. (Creator), Barnes, L. (Creator), Bauer, A. E. (Creator), Bland-Hawthorn, J. (Creator), Bloom, J. V. (Creator), Brooks, A. M. (Creator), Brough, S. (Creator), Cecil, G. (Creator), Couch, W. (Creator), Croton, D. (Creator), Davies, R. (Creator), Ellis, S. (Creator), Fogarty, L. M. R. (Creator), Foster, C. (Creator), Glazebrook, K. (Creator), Goodwin, M. (Creator), Green, A. (Creator), Gunawardhana, M. L. (Creator), Hampton, E. (Creator), Ho, I.-T. (Creator), Hopkins, A. M. (Creator), Kewley, L. (Creator), Lawrence, J. S. (Creator), Leon-Saval, S. G. (Creator), Leslie, S. (Creator), McElroy, R. (Creator), Lewis, G. (Creator), Liske, J. (Creator), Lopez-Sanchez, A. R. (Creator), Mahajan, S. (Creator), Medling, A. M. (Creator), Metcalfe, N. (Creator), Meyer, M. (Creator), Mould, J. (Creator), Obreschkow, D. (Creator), O'Toole, S. (Creator), Pracy, M. (Creator), Richards, S. N. (Creator), Shanks, T. (Creator), Sharp, R. (Creator), Sweet, S. M. (Creator), Thomas, A. D. (Creator), Tonini, C. (Creator) & Walcher, C. J. (Creator), SAMI Survey Team, 1 Mar 2015
https://sami-survey.org/ and one more link, https://datacentral.aao.gov.au/asvo/surveys/sami/ (show fewer)
Dataset

Cite this

Cecil, G., Fogarty, L. M. R., Richards, S., Bland-Hawthorn, J., Lange, R., Moffett, A., Catinella, B., Cortese, L., Ho, I. .-T., Taylor, E. N., Bryant, J. J., Allen, J. T., Sweet, S. M., Croom, S. M., Driver, S. P., Goodwin, M., Kelvin, L., Green, A. W., Konstantopoulos, I. S., ... Lorente, N. P. F. (2016). The SAMI Galaxy Survey: gas streaming and dynamical M/L in rotationally supported systems. Monthly Notices of the Royal Astronomical Society, 456(2), 1299-1319. https://doi.org/10.1093/mnras/stv2643

@article{bdc52e036ff94c5f8e9623d844e8836b,

title = "The SAMI Galaxy Survey: gas streaming and dynamical M/L in rotationally supported systems",

abstract = "Line-of-sight velocities of gas and stars can constrain dark matter (DM) within rotationally supported galaxies if they trace circular orbits extensively. Photometric asymmetries may signify non-circular motions, requiring spectra with dense spatial coverage. Our integral-field spectroscopy of 178 galaxies spanned the mass range of the Sydney-AAO Multi-object integral field spectrograph (SAMI) Galaxy Survey. We derived circular speed curves (CSCs) of gas and stars from non-parametric fits out to r ∼ 2re. For 12/14 with measured H i profiles, ionized gas and H i maximum velocities agreed. We fitted mass-follows-light models to 163 galaxies by approximating the radial light profile as nested, very flattened mass homeoids viewed as a S{\'e}rsic form. Fitting broad-band spectral energy distributions to Sloan Digital Sky Survey images gave median stellar mass/light 1.7 assuming a Kroupa initial mass function (IMF) versus 2.6 dynamically. Two-thirds of the dynamical mass/light measures were consistent with star+remnant IMFs. One-fifth required upscaled starlight to fit, hence comparable mass of unobserved baryons and/or DM distributed like starlight across the SAMI aperture that came to dominate motions as the starlight CSCs declined rapidly. The rest had mass distributed differently from light. Subtracting fits of S{\'e}rsic radial profiles to 13 VIKING Z-band images revealed residual weak bars. Near the bar major axis, we assessed m = 2 streaming velocities, and found deviations usually <30 km s−1 from the CSC; three showed no deviation. Thus, asymmetries rarely influenced the CSC despite colocated shock-indicating, emission-line flux ratios in more than 2/3 of our sample.",

keywords = "Galaxies: kinematics and dynamics, Galaxies: spiral, Galaxies: structure",

author = "G. Cecil and Fogarty, {L. M. R.} and S. Richards and J. Bland-Hawthorn and R. Lange and A. Moffett and B. Catinella and L. Cortese and Ho, {I. -T.} and Taylor, {E. N.} and Bryant, {J. J.} and Allen, {J. T.} and Sweet, {S. M.} and Croom, {S. M.} and Driver, {S. P.} and M. Goodwin and L. Kelvin and Green, {A. W.} and Konstantopoulos, {I. S.} and Owers, {M. S.} and Lawrence, {J. S.} and Lorente, {N. P. F.}",

year = "2016",

month = feb,

day = "21",

doi = "10.1093/mnras/stv2643",

language = "English",

volume = "456",

pages = "1299--1319",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Cecil, G, Fogarty, LMR, Richards, S, Bland-Hawthorn, J, Lange, R, Moffett, A, Catinella, B, Cortese, L, Ho, I-T, Taylor, EN, Bryant, JJ, Allen, JT, Sweet, SM, Croom, SM, Driver, SP, Goodwin, M, Kelvin, L, Green, AW, Konstantopoulos, IS, Owers, MS, Lawrence, JS & Lorente, NPF 2016, 'The SAMI Galaxy Survey: gas streaming and dynamical M/L in rotationally supported systems', Monthly Notices of the Royal Astronomical Society, vol. 456, no. 2, pp. 1299-1319. https://doi.org/10.1093/mnras/stv2643

TY - JOUR

T1 - The SAMI Galaxy Survey

T2 - gas streaming and dynamical M/L in rotationally supported systems

AU - Cecil, G.

AU - Fogarty, L. M. R.

AU - Richards, S.

AU - Bland-Hawthorn, J.

AU - Lange, R.

AU - Moffett, A.

AU - Catinella, B.

AU - Cortese, L.

AU - Ho, I. -T.

AU - Taylor, E. N.

AU - Bryant, J. J.

AU - Allen, J. T.

AU - Sweet, S. M.

AU - Croom, S. M.

AU - Driver, S. P.

AU - Goodwin, M.

AU - Kelvin, L.

AU - Green, A. W.

AU - Konstantopoulos, I. S.

AU - Owers, M. S.

AU - Lawrence, J. S.

AU - Lorente, N. P. F.

PY - 2016/2/21

Y1 - 2016/2/21

N2 - Line-of-sight velocities of gas and stars can constrain dark matter (DM) within rotationally supported galaxies if they trace circular orbits extensively. Photometric asymmetries may signify non-circular motions, requiring spectra with dense spatial coverage. Our integral-field spectroscopy of 178 galaxies spanned the mass range of the Sydney-AAO Multi-object integral field spectrograph (SAMI) Galaxy Survey. We derived circular speed curves (CSCs) of gas and stars from non-parametric fits out to r ∼ 2re. For 12/14 with measured H i profiles, ionized gas and H i maximum velocities agreed. We fitted mass-follows-light models to 163 galaxies by approximating the radial light profile as nested, very flattened mass homeoids viewed as a Sérsic form. Fitting broad-band spectral energy distributions to Sloan Digital Sky Survey images gave median stellar mass/light 1.7 assuming a Kroupa initial mass function (IMF) versus 2.6 dynamically. Two-thirds of the dynamical mass/light measures were consistent with star+remnant IMFs. One-fifth required upscaled starlight to fit, hence comparable mass of unobserved baryons and/or DM distributed like starlight across the SAMI aperture that came to dominate motions as the starlight CSCs declined rapidly. The rest had mass distributed differently from light. Subtracting fits of Sérsic radial profiles to 13 VIKING Z-band images revealed residual weak bars. Near the bar major axis, we assessed m = 2 streaming velocities, and found deviations usually <30 km s−1 from the CSC; three showed no deviation. Thus, asymmetries rarely influenced the CSC despite colocated shock-indicating, emission-line flux ratios in more than 2/3 of our sample.

AB - Line-of-sight velocities of gas and stars can constrain dark matter (DM) within rotationally supported galaxies if they trace circular orbits extensively. Photometric asymmetries may signify non-circular motions, requiring spectra with dense spatial coverage. Our integral-field spectroscopy of 178 galaxies spanned the mass range of the Sydney-AAO Multi-object integral field spectrograph (SAMI) Galaxy Survey. We derived circular speed curves (CSCs) of gas and stars from non-parametric fits out to r ∼ 2re. For 12/14 with measured H i profiles, ionized gas and H i maximum velocities agreed. We fitted mass-follows-light models to 163 galaxies by approximating the radial light profile as nested, very flattened mass homeoids viewed as a Sérsic form. Fitting broad-band spectral energy distributions to Sloan Digital Sky Survey images gave median stellar mass/light 1.7 assuming a Kroupa initial mass function (IMF) versus 2.6 dynamically. Two-thirds of the dynamical mass/light measures were consistent with star+remnant IMFs. One-fifth required upscaled starlight to fit, hence comparable mass of unobserved baryons and/or DM distributed like starlight across the SAMI aperture that came to dominate motions as the starlight CSCs declined rapidly. The rest had mass distributed differently from light. Subtracting fits of Sérsic radial profiles to 13 VIKING Z-band images revealed residual weak bars. Near the bar major axis, we assessed m = 2 streaming velocities, and found deviations usually <30 km s−1 from the CSC; three showed no deviation. Thus, asymmetries rarely influenced the CSC despite colocated shock-indicating, emission-line flux ratios in more than 2/3 of our sample.

KW - Galaxies: kinematics and dynamics

KW - Galaxies: spiral

KW - Galaxies: structure

U2 - 10.1093/mnras/stv2643

DO - 10.1093/mnras/stv2643

M3 - Article

SN - 0035-8711

VL - 456

SP - 1299

EP - 1319

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

The SAMI Galaxy Survey: gas streaming and dynamical M/L in rotationally supported systems

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SAMI Galaxy Survey

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