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In this paper we present a catalogue of Giant Molecular Clouds (GMCs) in theAndromeda (M31) galaxy extracted from the Hershel Exploitation of Local GalaxyAndromeda (HELGA) dataset. GMCs are identified from the Herschel maps using ahierarchical source extraction algorithm. We present the results of this newcatalogue and characterise the spatial distribution and spectral energyproperties of its clouds based on the radial dust/gas properties found by Smithet al (2012). 236 GMCs in the mass range 10^4-10^7 M_sol are identified, theircumulative mass distribution is found to be proportional to M^-1.45 inagreement with earlier studies. The GMCs appear to follow the same cloud massto L_CO correlation observed in the Milky Way. However, comparison between thiscatalogue and interferometry studies also shows that the GMCs are substructuredbelow the Herschel resolution limit suggesting that we are observingassociations of GMCs. Following Gordon et al. (2006), we study the spatialstructure of M31 by splitting the observed structure into a set of spiral armsand offset rings. We fit radii of 10.5 and 15.5 kpc to the two most prominentrings. We then fit a logarithmic spiral with a pitch angle of 8.9 deg to theGMCs not associated with either ring. Lastly, we comment upon the effects ofdeprojection on our results and investigate the effect different models forM31's inclination will have upon the projection of an unperturbed spiral armsystem.

The Herschel Exploitation of Local Galaxy Andromeda (HELGA). VI. The distribution and properties of molecular cloud associations in M31