S. Sanches | Searcharxiv

arXiv2012

Parton distributions in the presence of target mass corrections

We study the consistency of parton distribution functions in the presence of target mass corrections (TMCs) at low Q^2. We review the standard operator product expansion derivation of TMCs in both x and moment space, and present the results in closed form for all unpolarized structure functions and their moments. To avoid the unphysical region at x > 1 in the standard TMC analysis, we propose an expansion of the target mass corrected structure functions order by order in M^2/Q^2, and assess the convergence properties of the resulting forms numerically.

hep-ph↗

arXiv2005

IR mergers and IR QSOs with galactic winds. III. Mrk 231: composite outflow with multiple expanding bubbles and BALs (an exploding young QSO?)

A study of outflow (OF) and BAL systems in Mrk 231 (and in similar IR QSOs) is presented. This study is based mainly on 1D and 2D spectroscopy (obtained at La Palma/WHT, HST, IUE, ESO/NTT, KPNO, APO and CASLEO observatories) plus HST images. For Mrk 231 we report evidence that the extreme nuclear OF process has at least 3 main components, which are probably associated with: (i) the radio jet, at pc scale, and (ii(the extreme starburst at pc and kpc scale. This OF has generate 4 or more concentric expanding bubbles and the BAL systems. The variability of the short lived BAL-III system was studied. Finally, the IR colour diagram and the UV BAL system of IR+OF+FeII QSOs are analysed. We propose that the phase of young QSO is associated with:accretion of large amount of gas (by the SMBH)+extreme starburst+extreme composite OFs/BALs.

astro-ph↗