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  • 1
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    A catalogue of two-dimensional photometric decompositions in the SDSS-DR7 spectroscopic main galaxy sample: extension to g and i bands (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-25
    Description: We extend the catalogue of two-dimensional, Point-Spread-Function-corrected de Vacouleurs, Sérsic, de Vacouleurs+Exponential, and Sérsic+Exponential fits of ~7 x 10 5 galaxies presented in Meert et al. to include the g and i bands. Fits are analysed using the physically motivated flagging system presented in the original text, making adjustments for the differing signal to noise when necessary. We compare the fits in each of the g, r , and i bands. Fixed aperture magnitudes and colours are also provided for all galaxies. The catalogues are available in electronic format.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 2
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    A catalogue of 2D photometric decompositions in the SDSS-DR7 spectroscopic main galaxy sample: preferred models and systematics (2014)
    Oxford University Press
    Details
    Publication Date: 2014-12-12
    Description: We present a catalogue of 2D, point spread function-corrected de Vacouleurs, Sérsic, de Vacouleurs+Exponential, and Sérsic+Exponential fits of ~7 x 10 5 spectroscopically selected galaxies drawn from the Sloan Digital Sky Survey (SDSS) Data Release 7. Fits are performed for the SDSS r band utilizing the fitting routine galfit and analysis pipeline pymorph . We compare these fits to prior catalogues. Fits are analysed using a physically motivated flagging system. The flags suggest that more than 90 per cent of two-component fits can be used for analysis. We show that the fits follow the expected behaviour for early and late galaxy types. The catalogues provide a robust set of structural and photometric parameters for future galaxy studies. We show that some biases remain in the measurements, e.g. the presence of bars significantly affect the bulge measurements although the bulge ellipticity may be used to separate barred and non-barred galaxies, and about 15 per cent of bulges of two-component fits are also affected by resolution. The catalogues are available in electronic format. We also provide an interface for generating postage stamp images of the 2D model and residual as well as the 1D profile. These images can be generated for a user-uploaded list of galaxies on demand.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 3
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    Simulations of single- and two-component galaxy decompositions for spectroscopically selected galaxies from the Sloan Digital Sky Survey (2013)
    Oxford University Press
    Details
    Publication Date: 2013-07-04
    Description: We present the results of fitting simulations of an unbiased sample of Sloan Digital Sky Survey (SDSS) galaxies utilizing the fitting routine galfit and analysis pipeline pymorph . These simulations are used to test the two-dimensional decompositions of SDSS galaxies. The simulations show that single Sérsic models of SDSS data are recovered with mag   0.025 mag and radius   5 per cent. The global values (half-light radius and magnitude) are equally well constrained when a two-component model is used. Sub-components of two-component models present more scatter. SDSS resolution is the primary source of error in the recovery of models. We use a simple statistical correction of the biases in fitted parameters, providing an example using the Sérsic index. Fitting a two-component Sérsic + Exponential model to a single Sérsic galaxy results in a noisier, but unbiased, recovery of the input parameters ( totalmag   0.075 mag and radius   10 per cent); fitting a single Sérsic profile to a two-component system results in biases of total magnitude and half-light radius of 0.05-0.10 mag and 5–10 per cent in radius. Using an F -test to select the best-fitting model from among the single- and two-component models is sufficient to remove this bias. We recommend fitting a two-component model to all galaxies when attempting to measure global parameters such as total magnitude and half-light radius.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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