THE SAMI GALAXY SURVEY: TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES

L. Cortese; L. M.R. Fogarty; I. T. Ho; K. Bekki; J. Bland-Hawthorn; M. Colless; W. Couch; S. M. Croom; K. Glazebrook; J. Mould; N. Scott; R. Sharp; C. Tonini; J. T. Allen; J. Bloom; J. J. Bryant; M. Cluver; R. L. Davies; M. J. Drinkwater; M. Goodwin; A. Green; L. J. Kewley; I. S. Kostantopoulos; J. S. Lawrence; S. Mahajan; A. M. Medling; M. Owers; S. N. Richards; S. M. Sweet; O. I. Wong

doi:10.1088/2041-8205/795/2/L37

THE SAMI GALAXY SURVEY: TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES

L. Cortese, L. M.R. Fogarty, I. T. Ho, K. Bekki, J. Bland-Hawthorn, M. Colless, W. Couch, S. M. Croom, K. Glazebrook, J. Mould, N. Scott, R. Sharp, C. Tonini, J. T. Allen, J. Bloom, J. J. Bryant, M. Cluver, R. L. Davies, M. J. Drinkwater, M. GoodwinA. Green, L. J. Kewley, I. S. Kostantopoulos, J. S. Lawrence, S. Mahajan, A. M. Medling, M. Owers, S. N. Richards, S. M. Sweet, O. I. Wong

Research output: Contribution to journal › Review article › peer-review

74 Citations (Scopus)

Abstract

We take advantage of the first data from the Sydney-AAO Multi-object Integral field Galaxy Survey to investigate the relation between the kinematics of gas and stars, and stellar mass in a comprehensive sample of nearby galaxies. We find that all 235 objects in our sample, regardless of their morphology, lie on a tight relation linking stellar mass (M∗) to internal velocity quantified by the S_0.5 parameter, which combines the contribution of both dispersion (σ) and rotational velocity (V_rot) to the dynamical support of a galaxy (S_0.5 = √ 0.5 V_rot² + σ²). Our results are independent of the baryonic component from which σ and V _rot are estimated, as the S _0.5 of stars and gas agree remarkably well. This represents a significant improvement compared to the canonical M∗ versus V_rot and M∗ versus σ relations. Not only is no sample pruning necessary, but also stellar and gas kinematics can be used simultaneously, as the effect of asymmetric drift is taken into account once V_rot and σ are combined. Our findings illustrate how the combination of dispersion and rotational velocities for both gas and stars can provide us with a single dynamical scaling relation valid for galaxies of all morphologies across at least the stellar mass range 8.5 <log (M∗/M_⊙) < 11. Such relation appears to be more general and at least as tight as any other dynamical scaling relation, representing a unique tool for investigating the link between galaxy kinematics and baryonic content, and a less biased comparison with theoretical models.

Original language	English
Article number	L37
Journal	Astrophysical Journal Letters
Volume	795
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/795/2/L37
Publication status	Published - 10 Nov 2014

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Cortese, L., Fogarty, L. M. R., Ho, I. T., Bekki, K., Bland-Hawthorn, J., Colless, M., Couch, W., Croom, S. M., Glazebrook, K., Mould, J., Scott, N., Sharp, R., Tonini, C., Allen, J. T., Bloom, J., Bryant, J. J., Cluver, M., Davies, R. L., Drinkwater, M. J., ... Wong, O. I. (2014). THE SAMI GALAXY SURVEY: TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES. Astrophysical Journal Letters, 795(2), Article L37. https://doi.org/10.1088/2041-8205/795/2/L37

@article{6d58e03dbbad4d8ca1dd03695f163e43,

title = "THE SAMI GALAXY SURVEY: TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES",

abstract = "We take advantage of the first data from the Sydney-AAO Multi-object Integral field Galaxy Survey to investigate the relation between the kinematics of gas and stars, and stellar mass in a comprehensive sample of nearby galaxies. We find that all 235 objects in our sample, regardless of their morphology, lie on a tight relation linking stellar mass (M∗) to internal velocity quantified by the S0.5 parameter, which combines the contribution of both dispersion (σ) and rotational velocity (Vrot) to the dynamical support of a galaxy (S0.5 = √ 0.5 Vrot2 + σ2). Our results are independent of the baryonic component from which σ and V rot are estimated, as the S 0.5 of stars and gas agree remarkably well. This represents a significant improvement compared to the canonical M∗ versus Vrot and M∗ versus σ relations. Not only is no sample pruning necessary, but also stellar and gas kinematics can be used simultaneously, as the effect of asymmetric drift is taken into account once Vrot and σ are combined. Our findings illustrate how the combination of dispersion and rotational velocities for both gas and stars can provide us with a single dynamical scaling relation valid for galaxies of all morphologies across at least the stellar mass range 8.5 ⊙) < 11. Such relation appears to be more general and at least as tight as any other dynamical scaling relation, representing a unique tool for investigating the link between galaxy kinematics and baryonic content, and a less biased comparison with theoretical models.",

keywords = "galaxies: evolution, galaxies: fundamental parameters, galaxies: kinematics and dynamics",

author = "L. Cortese and Fogarty, {L. M.R.} and Ho, {I. T.} and K. Bekki and J. Bland-Hawthorn and M. Colless and W. Couch and Croom, {S. M.} and K. Glazebrook and J. Mould and N. Scott and R. Sharp and C. Tonini and Allen, {J. T.} and J. Bloom and Bryant, {J. J.} and M. Cluver and Davies, {R. L.} and Drinkwater, {M. J.} and M. Goodwin and A. Green and Kewley, {L. J.} and Kostantopoulos, {I. S.} and Lawrence, {J. S.} and S. Mahajan and Medling, {A. M.} and M. Owers and Richards, {S. N.} and Sweet, {S. M.} and Wong, {O. I.}",

year = "2014",

month = nov,

day = "10",

doi = "10.1088/2041-8205/795/2/L37",

language = "English",

volume = "795",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "2",

}

Cortese, L, Fogarty, LMR, Ho, IT, Bekki, K, Bland-Hawthorn, J, Colless, M, Couch, W, Croom, SM, Glazebrook, K, Mould, J, Scott, N, Sharp, R, Tonini, C, Allen, JT, Bloom, J, Bryant, JJ, Cluver, M, Davies, RL, Drinkwater, MJ, Goodwin, M, Green, A, Kewley, LJ, Kostantopoulos, IS, Lawrence, JS, Mahajan, S, Medling, AM, Owers, M, Richards, SN, Sweet, SM & Wong, OI 2014, 'THE SAMI GALAXY SURVEY: TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES', Astrophysical Journal Letters, vol. 795, no. 2, L37. https://doi.org/10.1088/2041-8205/795/2/L37

TY - JOUR

T1 - THE SAMI GALAXY SURVEY

T2 - TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES

AU - Cortese, L.

AU - Fogarty, L. M.R.

AU - Ho, I. T.

AU - Bekki, K.

AU - Bland-Hawthorn, J.

AU - Colless, M.

AU - Couch, W.

AU - Croom, S. M.

AU - Glazebrook, K.

AU - Mould, J.

AU - Scott, N.

AU - Sharp, R.

AU - Tonini, C.

AU - Allen, J. T.

AU - Bloom, J.

AU - Bryant, J. J.

AU - Cluver, M.

AU - Davies, R. L.

AU - Drinkwater, M. J.

AU - Goodwin, M.

AU - Green, A.

AU - Kewley, L. J.

AU - Kostantopoulos, I. S.

AU - Lawrence, J. S.

AU - Mahajan, S.

AU - Medling, A. M.

AU - Owers, M.

AU - Richards, S. N.

AU - Sweet, S. M.

AU - Wong, O. I.

PY - 2014/11/10

Y1 - 2014/11/10

N2 - We take advantage of the first data from the Sydney-AAO Multi-object Integral field Galaxy Survey to investigate the relation between the kinematics of gas and stars, and stellar mass in a comprehensive sample of nearby galaxies. We find that all 235 objects in our sample, regardless of their morphology, lie on a tight relation linking stellar mass (M∗) to internal velocity quantified by the S0.5 parameter, which combines the contribution of both dispersion (σ) and rotational velocity (Vrot) to the dynamical support of a galaxy (S0.5 = √ 0.5 Vrot2 + σ2). Our results are independent of the baryonic component from which σ and V rot are estimated, as the S 0.5 of stars and gas agree remarkably well. This represents a significant improvement compared to the canonical M∗ versus Vrot and M∗ versus σ relations. Not only is no sample pruning necessary, but also stellar and gas kinematics can be used simultaneously, as the effect of asymmetric drift is taken into account once Vrot and σ are combined. Our findings illustrate how the combination of dispersion and rotational velocities for both gas and stars can provide us with a single dynamical scaling relation valid for galaxies of all morphologies across at least the stellar mass range 8.5 ⊙) < 11. Such relation appears to be more general and at least as tight as any other dynamical scaling relation, representing a unique tool for investigating the link between galaxy kinematics and baryonic content, and a less biased comparison with theoretical models.

AB - We take advantage of the first data from the Sydney-AAO Multi-object Integral field Galaxy Survey to investigate the relation between the kinematics of gas and stars, and stellar mass in a comprehensive sample of nearby galaxies. We find that all 235 objects in our sample, regardless of their morphology, lie on a tight relation linking stellar mass (M∗) to internal velocity quantified by the S0.5 parameter, which combines the contribution of both dispersion (σ) and rotational velocity (Vrot) to the dynamical support of a galaxy (S0.5 = √ 0.5 Vrot2 + σ2). Our results are independent of the baryonic component from which σ and V rot are estimated, as the S 0.5 of stars and gas agree remarkably well. This represents a significant improvement compared to the canonical M∗ versus Vrot and M∗ versus σ relations. Not only is no sample pruning necessary, but also stellar and gas kinematics can be used simultaneously, as the effect of asymmetric drift is taken into account once Vrot and σ are combined. Our findings illustrate how the combination of dispersion and rotational velocities for both gas and stars can provide us with a single dynamical scaling relation valid for galaxies of all morphologies across at least the stellar mass range 8.5 ⊙) < 11. Such relation appears to be more general and at least as tight as any other dynamical scaling relation, representing a unique tool for investigating the link between galaxy kinematics and baryonic content, and a less biased comparison with theoretical models.

KW - galaxies: evolution

KW - galaxies: fundamental parameters

KW - galaxies: kinematics and dynamics

UR - http://www.scopus.com/inward/record.url?scp=84937576072&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/795/2/L37

DO - 10.1088/2041-8205/795/2/L37

M3 - Review article

SN - 2041-8205

VL - 795

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L37

ER -

THE SAMI GALAXY SURVEY: TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES

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