We present Gemini Multiobject Spectrograph integral field spectroscopy of the extended emission-line region associated with quasar 3C 249.1. The kinematics of the ionized gas measured from the [O III] λ5007 line is rather complex and cannot be explained globally by a simple dynamical model, but some clouds can be modeled individually as having locally linear velocity gradients. The temperatures...

Wisconsin H-Alpha Mapper observations of Hαand [S II]λ6716 emission are used to trace the vertical distribution and physical conditions of the warm ionized medium along the Sagittarius–Carina arm. CO emission, tracing cold molecular gas in the plane of the Galaxy, is used as a guide to isolate Hαand [S II]λ6716 emission along individual spiral arms. Exponential scale heights of electron den...

We present Goddard High Resolution Spectrograph and ORFEUS-II measurements of Si IV, C IV, N V, and O VI absorption in the interstellar medium of the Galactic disk and halo toward the nucleus of the Seyfert galaxy ESO141-055. The high ionization absorption is strong, with line strengths consistent with the spectral signature expected for hot (T ∼> 10 K) collisionally ionized gas in either a “Ga...

We present Goddard High Resolution Spectrograph and ORFEUS-II measurements of Si IV, C IV, N V, and O VI absorption in the interstellar medium of the Galactic disk and halo toward the nucleus of the Seyfert galaxy ESO141-055. The high ionization absorption is strong, with line strengths consistent with the spectral signature expected for hot (T ∼> 10 5 K) collisionally ionized gas in either a “...

We investigate the distribution of the interstellar matter in the environs of the H ii region Sh2-205, based on neutral hydrogen 21–cm line data and radio continuum images at 408 and 1420 MHz obtained from the CGPS, 12 CO (J=1→0) observations, high resolution IRAS data (HIRES), and MSX data. Sh2-205 can be separated in three independent optical structures: SH 149.25–0.0, SH 148.83–0.67, and LBN...

We study the dispersal of a gaseous disc surrounding a central high-mass stellar core once this circumstellar disc becomes fully ionized. If the stellar and surrounding EUV and X-ray radiations are so strong as to rapidly heat up and ionize the entire circumstellar disc as further facilitated by disc magnetohydrodynamic (MHD) turbulence, a shock can be driven to travel outward in the fully ioni...

Consequences of ionization were studied by quantum-chemical methods (DFT and PCM) for 1-methylcytosine (MC)-a model of the nucleobase cytosine (C) connected with sugar in DNA. For calculations, three prototropic tautomers (one amino and two imino forms) and two imino zwitterions were considered, including conformational or configurational isomerism of exo heterogroups. Ionization and interactio...

We present high resolution (0.12× 0.079) observations of the ultracompact Hii region G10.6-0.4 in 23 GHz radio continuum and the NH3(3,3) line. Our data show that the infall in the molecular material is largely spherical, and does not flatten into a molecular disk at radii as small as 0.03 pc. The spherical infall in the molecular gas matches in location and velocity the infall seen in the ioni...

We consider the structure of steady–state radiative shock waves propagating in the partially ionized hydrogen gas with density ρ1 = 10 −10 gm cm and temperature 3000 K ≤ T1 ≤ 8000 K. The radiative shock wave models with electron thermal conduction in the vicinity of the viscous jump are compared with pure radiative models. The threshold shock wave velocity above of which effects of electron the...

The preliminary results from a deep emission-line search for warm ionized material in the halos of nearby active and star-forming galaxies are presented. The origin of this gas is discussed in the context of galaxy formation and evolution.