000004755 001__ 4755
000004755 005__ 20200203154343.0
000004755 0247_ $$2DOI$$a10.1093/mnras/stz857
000004755 037__ $$aSCART-2020-0055
000004755 100__ $$aGuzmán, F.
000004755 245__ $$aH-, He-like recombination spectra - III. n-changing collisions in highly excited Rydberg states and their impact on the radio, IR, and optical recombination lines
000004755 260__ $$c2019
000004755 520__ $$aAt intermediate to high densities, electron (de-)excitation collisions are the dominant process for populating or depopulating high Rydberg states. In particular, the accurate knowledge of the energy changing (n-changing) collisional rates is determinant for predicting the radio recombination spectra of gaseous nebula. The different data sets present in the literature come either from impact parameter calculations or semi-empirical fits and the rate coefficients agree within a factor of 2. We show in this paper that these uncertainties cause errors lower than 5 per cent in the emission of radio recombination lines of most ionized plasmas of typical nebulae. However, in special circumstances where the transitions between Rydberg levels are amplified by maser effects, the errors can increase up to 20 per cent. We present simulations of the optical depth and Hnα line emission of active galactic nuclei broad-line regions and the Orion Nebula Blister to showcase our findings.
000004755 594__ $$aNO
000004755 6531_ $$aatomic data
000004755 6531_ $$aatomic processes
000004755 6531_ $$amasers
000004755 6531_ $$aH II regions
000004755 6531_ $$aradio lines: general
000004755 6531_ $$asubmillimetre: general
000004755 6531_ $$aAstrophysics - Astrophysics of Galaxies
000004755 6531_ $$aPhysics - Atomic Physics
000004755 700__ $$aChatzikos, M.
000004755 700__ $$avan Hoof, P. A. M.
000004755 700__ $$aBalser, Dana S.
000004755 700__ $$aDehghanian, M.
000004755 700__ $$aBadnell, N. R.
000004755 700__ $$aFerland, G. J.
000004755 773__ $$c1003-1018$$n1$$pMonthly Notices of the Royal Astronomical Society$$v486$$y2019
000004755 8560_ $$fpeter.vanhoof@observatoire.be
000004755 85642 $$ahttps://arxiv.org/abs/1903.05730
000004755 905__ $$apublished in
000004755 980__ $$aREFERD