GHASP : An Halpha kinematic survey of 203 spiral and irregular galaxies - VII. Revisiting the analysis of Halpha data cubes for 97 galaxies - AstrophysicsReport as inadecuate




GHASP : An Halpha kinematic survey of 203 spiral and irregular galaxies - VII. Revisiting the analysis of Halpha data cubes for 97 galaxies - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The GHASP survey Gassendi HAlpha survey of SPirals consists of 3D Ha datacubes for 203 spiral and irregular galaxies, covering a large range inmorphological types and absolute magnitudes, for kinematics analysis. It is thelargest sample of Fabry-Perot data published up to now. In order to provide anhomogenous sample, reduced and analyzed using the same procedure, we present inthis paper the new reduction and analysis for a set of 97 galaxies alreadypublished in previous papers but now using the new data reduction procedureadopted for the whole sample. The GHASP survey is now achieved and the wholesample is reduced using adaptive binning techniques based on Voronoitessellations. We have derived Ha data cubes from which are computed Ha maps,radial velocity fields as well as residual velocity fields, position-velocitydiagrams, rotation curves and kinematical parameters for almost all galaxies.The rotation curves, the kinematical parameters and their uncertainties arecomputed homogeneously using the new method based on the power spectrum of theresidual velocity field. This paper provides the kinematical parameters for thewhole sample. For the first time, the integrated Ha profiles have been computedand are presented for the whole sample. The total Ha fluxes deduced from theseprofiles have been used in order to provide a flux calibration for the 203GHASP galaxies. This paper confirms the conclusions already drawn from half thesample concerning i the increased accuracy of position angles measurementsusing kinematical data, ii the difficulty to have robust determinations ofboth morphological and kinematical inclinations in particular for lowinclination galaxies and iii the very good agreement between the Tully-Fisherrelationship derived from our data and previous determinations.



Author: B. Epinat, P. Amram, M. Marcelin

Source: https://arxiv.org/



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