TY - JOUR
T1 - Non-parametric cell-based photometric proxies for galaxy morphology
T2 - methodology and application to the morphologically defined star formation-stellar mass relation of spiral galaxies in the local universe
AU - Grootes, M.W.
AU - Tuffs, R. J.
AU - Popescu, C. C.
AU - Robotham, A. S. G.
AU - Seibert, M.
AU - Kelvin, L. S.
PY - 2014/2/1
Y1 - 2014/2/1
N2 - We present a non-parametric cell-based method of selecting highly pure and largely complete samples of spiral galaxies using photometric and structural parameters as provided by standard photometric pipelines and simple shape fitting algorithms. The performance of the method is quantified for different parameter combinations, using purely human-based classifications as a benchmark. The discretization of the parameter space allows a markedly superior selection than commonly used proxies relying on a fixed curve or surface of separation. Moreover, we find structural parameters derived using passbands longwards of the g band and linked to older stellar populations, especially the stellar mass surface density μ* and the r-band effective radius re, to perform at least equally well as parameters more traditionally linked to the identification of spirals by means of their young stellar populations, e.g. UV/optical colours. In particular, the distinct bimodality in the parameter μ*, consistent with expectations of different evolutionary paths for spirals and ellipticals, represents an often overlooked yet powerful parameter in differentiating between spiral and non-spiral/elliptical galaxies. We use the cell-based method for the optical parameter set including re in combination with the Sérsic index n and the i-band magnitude to investigate the intrinsic specific star formation rate-stellar mass relation (ψ*-M*) for a morphologically defined volume-limited sample of local Universe spiral galaxies. The relation is found to be well described by ψ* α M*-0.5over the range of 109.5 ≤ M* ≤ 1011M⊙ with a mean interquartile range of 0.4 dex. This is somewhat steeper than previous determinations based on colour-selected samples of starforming galaxies, primarily due to the inclusion in the sample of red quiescent discs.
AB - We present a non-parametric cell-based method of selecting highly pure and largely complete samples of spiral galaxies using photometric and structural parameters as provided by standard photometric pipelines and simple shape fitting algorithms. The performance of the method is quantified for different parameter combinations, using purely human-based classifications as a benchmark. The discretization of the parameter space allows a markedly superior selection than commonly used proxies relying on a fixed curve or surface of separation. Moreover, we find structural parameters derived using passbands longwards of the g band and linked to older stellar populations, especially the stellar mass surface density μ* and the r-band effective radius re, to perform at least equally well as parameters more traditionally linked to the identification of spirals by means of their young stellar populations, e.g. UV/optical colours. In particular, the distinct bimodality in the parameter μ*, consistent with expectations of different evolutionary paths for spirals and ellipticals, represents an often overlooked yet powerful parameter in differentiating between spiral and non-spiral/elliptical galaxies. We use the cell-based method for the optical parameter set including re in combination with the Sérsic index n and the i-band magnitude to investigate the intrinsic specific star formation rate-stellar mass relation (ψ*-M*) for a morphologically defined volume-limited sample of local Universe spiral galaxies. The relation is found to be well described by ψ* α M*-0.5over the range of 109.5 ≤ M* ≤ 1011M⊙ with a mean interquartile range of 0.4 dex. This is somewhat steeper than previous determinations based on colour-selected samples of starforming galaxies, primarily due to the inclusion in the sample of red quiescent discs.
KW - Galaxies: fundamental parameters
KW - Galaxes: photometry
KW - Galaxies: spiral
KW - Galaxies: structure
UR - http://mnras.oxfordjournals.org/content/437/4/3883/suppl/DC1
UR - https://www.scopus.com/pages/publications/84891364247
U2 - 10.1093/mnras/stt2184
DO - 10.1093/mnras/stt2184
M3 - Article
AN - SCOPUS:84891364247
SN - 0035-8711
VL - 437
SP - 3883
EP - 3917
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -