Galaxy And Mass Assembly (GAMA): Bivariate functions of Hα star-forming galaxies

M. L.P. Gunawardhana; A. M. Hopkins; E. N. Taylor; J. Bland-Hawthorn; P. Norberg; I. K. Baldry; J. Loveday; M. S. Owers; S. M. Wilkins; M. Colless; M. J.I. Brown; S. P. Driver; M. Alpaslan; S. Brough; M. Cluver; S. Croom; L. Kelvin; M. A. Lara-López; J. Liske; A. R. López-Sánchez; A. S.G. Robotham

doi:10.1093/mnras/stu2232

Galaxy And Mass Assembly (GAMA): Bivariate functions of Hα star-forming galaxies

M. L.P. Gunawardhana^*, A. M. Hopkins, E. N. Taylor, J. Bland-Hawthorn, P. Norberg, I. K. Baldry, J. Loveday, M. S. Owers, S. M. Wilkins, M. Colless, M. J.I. Brown, S. P. Driver, M. Alpaslan, S. Brough, M. Cluver, S. Croom, L. Kelvin, M. A. Lara-López, J. Liske, A. R. López-SánchezA. S.G. Robotham

^*Corresponding author for this work

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

19 Citations (Scopus)

Abstract

We present bivariate luminosity and stellar mass functions of Hα star-forming galaxies drawn from the Galaxy And Mass Assembly (GAMA) survey. While optically deep spectroscopic observations of GAMA over a wide sky area enable the detection of a large number of 0.001 < SFR_Hα(M yr^-1) < 100 galaxies, the requirement for an Hα detection in targets selected from an r-band magnitude-limited survey leads to an incompleteness due to missing optically faint star-forming galaxies. Using z < 0.1 bivariate distributions as a reference we model the higher-z distributions, thereby approximating a correction for the missing optically faint star-forming galaxies to the local star formation rate (SFR) andMdensities. Furthermore, we obtain the r-band luminosity functions (LFs) and stellar mass functions of Hα star-forming galaxies from the bivariate LFs.As our sample is selected on the basis of detectedHα emission, a direct tracer of ongoing star formation, this sample represents a true star-forming galaxy sample, and is drawn from both photometrically classified blue and red subpopulations, though mostly from the blue population. On average 20-30 per cent of red galaxies at all stellar masses are star forming, implying that these galaxies may be dusty star-forming systems.

Original language	English
Pages (from-to)	875-901
Number of pages	27
Journal	Monthly Notices of the Royal Astronomical Society
Volume	447
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stu2232
Publication status	Published - 20 Nov 2015

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Gunawardhana, M. L. P., Hopkins, A. M., Taylor, E. N., Bland-Hawthorn, J., Norberg, P., Baldry, I. K., Loveday, J., Owers, M. S., Wilkins, S. M., Colless, M., Brown, M. J. I., Driver, S. P., Alpaslan, M., Brough, S., Cluver, M., Croom, S., Kelvin, L., Lara-López, M. A., Liske, J., ... Robotham, A. S. G. (2015). Galaxy And Mass Assembly (GAMA): Bivariate functions of Hα star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 447(1), 875-901. https://doi.org/10.1093/mnras/stu2232

@article{d84727effa8047fb8bee2aea41fa6e92,

title = "Galaxy And Mass Assembly (GAMA): Bivariate functions of Hα star-forming galaxies",

abstract = "We present bivariate luminosity and stellar mass functions of Hα star-forming galaxies drawn from the Galaxy And Mass Assembly (GAMA) survey. While optically deep spectroscopic observations of GAMA over a wide sky area enable the detection of a large number of 0.001 < SFRHα(M yr-1) < 100 galaxies, the requirement for an Hα detection in targets selected from an r-band magnitude-limited survey leads to an incompleteness due to missing optically faint star-forming galaxies. Using z < 0.1 bivariate distributions as a reference we model the higher-z distributions, thereby approximating a correction for the missing optically faint star-forming galaxies to the local star formation rate (SFR) andMdensities. Furthermore, we obtain the r-band luminosity functions (LFs) and stellar mass functions of Hα star-forming galaxies from the bivariate LFs.As our sample is selected on the basis of detectedHα emission, a direct tracer of ongoing star formation, this sample represents a true star-forming galaxy sample, and is drawn from both photometrically classified blue and red subpopulations, though mostly from the blue population. On average 20-30 per cent of red galaxies at all stellar masses are star forming, implying that these galaxies may be dusty star-forming systems.",

keywords = "Galaxies: evolution, Galaxies: luminosity function, Galaxies: star formation, Mass function, Surveys",

author = "Gunawardhana, {M. L.P.} and Hopkins, {A. M.} and Taylor, {E. N.} and J. Bland-Hawthorn and P. Norberg and Baldry, {I. K.} and J. Loveday and Owers, {M. S.} and Wilkins, {S. M.} and M. Colless and Brown, {M. J.I.} and Driver, {S. P.} and M. Alpaslan and S. Brough and M. Cluver and S. Croom and L. Kelvin and Lara-L{\'o}pez, {M. A.} and J. Liske and L{\'o}pez-S{\'a}nchez, {A. R.} and Robotham, {A. S.G.}",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors.",

year = "2015",

month = nov,

day = "20",

doi = "10.1093/mnras/stu2232",

language = "English",

volume = "447",

pages = "875--901",

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

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publisher = "Oxford University Press ",

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Gunawardhana, MLP, Hopkins, AM, Taylor, EN, Bland-Hawthorn, J, Norberg, P, Baldry, IK, Loveday, J, Owers, MS, Wilkins, SM, Colless, M, Brown, MJI, Driver, SP, Alpaslan, M, Brough, S, Cluver, M, Croom, S, Kelvin, L, Lara-López, MA, Liske, J, López-Sánchez, AR & Robotham, ASG 2015, 'Galaxy And Mass Assembly (GAMA): Bivariate functions of Hα star-forming galaxies', Monthly Notices of the Royal Astronomical Society, vol. 447, no. 1, pp. 875-901. https://doi.org/10.1093/mnras/stu2232

TY - JOUR

T1 - Galaxy And Mass Assembly (GAMA)

T2 - Bivariate functions of Hα star-forming galaxies

AU - Gunawardhana, M. L.P.

AU - Hopkins, A. M.

AU - Taylor, E. N.

AU - Bland-Hawthorn, J.

AU - Norberg, P.

AU - Baldry, I. K.

AU - Loveday, J.

AU - Owers, M. S.

AU - Wilkins, S. M.

AU - Colless, M.

AU - Brown, M. J.I.

AU - Driver, S. P.

AU - Alpaslan, M.

AU - Brough, S.

AU - Cluver, M.

AU - Croom, S.

AU - Kelvin, L.

AU - Lara-López, M. A.

AU - Liske, J.

AU - López-Sánchez, A. R.

AU - Robotham, A. S.G.

PY - 2015/11/20

Y1 - 2015/11/20

N2 - We present bivariate luminosity and stellar mass functions of Hα star-forming galaxies drawn from the Galaxy And Mass Assembly (GAMA) survey. While optically deep spectroscopic observations of GAMA over a wide sky area enable the detection of a large number of 0.001 < SFRHα(M yr-1) < 100 galaxies, the requirement for an Hα detection in targets selected from an r-band magnitude-limited survey leads to an incompleteness due to missing optically faint star-forming galaxies. Using z < 0.1 bivariate distributions as a reference we model the higher-z distributions, thereby approximating a correction for the missing optically faint star-forming galaxies to the local star formation rate (SFR) andMdensities. Furthermore, we obtain the r-band luminosity functions (LFs) and stellar mass functions of Hα star-forming galaxies from the bivariate LFs.As our sample is selected on the basis of detectedHα emission, a direct tracer of ongoing star formation, this sample represents a true star-forming galaxy sample, and is drawn from both photometrically classified blue and red subpopulations, though mostly from the blue population. On average 20-30 per cent of red galaxies at all stellar masses are star forming, implying that these galaxies may be dusty star-forming systems.

AB - We present bivariate luminosity and stellar mass functions of Hα star-forming galaxies drawn from the Galaxy And Mass Assembly (GAMA) survey. While optically deep spectroscopic observations of GAMA over a wide sky area enable the detection of a large number of 0.001 < SFRHα(M yr-1) < 100 galaxies, the requirement for an Hα detection in targets selected from an r-band magnitude-limited survey leads to an incompleteness due to missing optically faint star-forming galaxies. Using z < 0.1 bivariate distributions as a reference we model the higher-z distributions, thereby approximating a correction for the missing optically faint star-forming galaxies to the local star formation rate (SFR) andMdensities. Furthermore, we obtain the r-band luminosity functions (LFs) and stellar mass functions of Hα star-forming galaxies from the bivariate LFs.As our sample is selected on the basis of detectedHα emission, a direct tracer of ongoing star formation, this sample represents a true star-forming galaxy sample, and is drawn from both photometrically classified blue and red subpopulations, though mostly from the blue population. On average 20-30 per cent of red galaxies at all stellar masses are star forming, implying that these galaxies may be dusty star-forming systems.

KW - Galaxies: evolution

KW - Galaxies: luminosity function

KW - Galaxies: star formation

KW - Mass function

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=84922439166&partnerID=8YFLogxK

U2 - 10.1093/mnras/stu2232

DO - 10.1093/mnras/stu2232

M3 - Article

SN - 0035-8711

VL - 447

SP - 875

EP - 901

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Galaxy And Mass Assembly (GAMA): Bivariate functions of Hα star-forming galaxies

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