Recent high spatial and spectral resolution investigations of the diffuse interstellar medium (ISM) have found significant evidence for small-scale variations in the interstellar gas on scales ≤ 1 pc. To better understand the nature of small-scale variations in the ISM, we have used the KPNO WIYN Hydra multi-object spectrograph, which has a mapping advantage over the single-axis, single-scale l...

Extended gas clouds have been previously detected surrounding the brightest known close-in hot Jupiter exoplanets, HD 209458 b and HD189733 b; we observed the distant but more extreme close-in hot Jupiter system, WASP-12, with HST. NearUV (NUV) transits up to three times deeper than the optical transit of WASP-12 b reveal extensive diffuse gas, extending well beyond the Roche lobe. The distribu...

Absorption cross-sections and quantum yields for NO2 production (ΦNO2) are reported for gaseous methyl, ethyl, n-propyl, and isopropyl nitrate at 294 K. Absorption cross-sections in the wavelength range of 240-320 nm agree well with prior determinations. NO2 quantum yields at photoexcitation wavelengths of 290, 295, and 315 nm are unity within experimental uncertainties for all of the alkyl nit...

Recent observations and theoretical calculations suggest that some QSO absorption line systems may be due to gas in small dark matter halos with circular velocities on the order of 30 km s. Kepner, Babul & Spergel (1997) have shown that gas in these “mini-halos” can readily be in a multi-phase state. Additional observational evidence suggests that, in general, many absorption line systems may a...

High resolution ultraviolet spectra with HST-GHRS of two stars in the direction of the supergiant shell LMC 4 unambiguously show absorption by substantial quantities of C IV gas at velocities near the the sys-temic velocity of the LMC. In combination with the detection of diffuse X-rays from the LMC 4 by ROSAT and other supporting data, this demonstrates that the interior of LMC 4 is filled wit...

The inhomogeneous cooling flow scenario predicts the existence of large quantities of gas in massive elliptical galaxies, groups, and clusters that have cooled and dropped out of the flow. Using spatially resolved, deprojected X-ray spectra from the ROSAT PSPC, we have detected strong absorption over energies approximately 0.4-0.8 keV intrinsic to the central approximately 1&arcmin; of the gala...

We have investigated the presence of dense gas toward the radio source Cen A by looking at the absorption of the HCO and HCN (3-2) lines in front of the bright continuum source with the Submillimeter Array. We detect narrow HCO (3-2) absorption, and tentatively HCN (3-2), close to the systemic velocity. For both molecules, the J = 3 − 2 absorption is much weaker than for the J = 1− 0 line. From...

Twenty-two powerful radio galaxies have been searched for HI absorption. We find the highest probability of detecting HI in absorption among narrow-line compact (or small) galaxies or galaxies with indication of richer interstellar medium (i.e. with ongoing or recent starformation). We discuss the difficulty in the interpretation of the origin of the HI absorption due to the uncertainty in the ...

Nanostructures have considerably higher surface areas than their bulk counterparts; thereforesurfaces often play important, sometimes even dominant, roles in the nanostructure properties. Thenanocrystalline and nanotubes have low band gaps and high carrier mobility, thus offeringappealing potential as absorption gas. Interaction between methanol molecules and carbonnanotube is investigated usin...

co2 emissions from combustion flue gases have turned into a major factor in global warming. post-combustion carbon capture (pcc) from industrial utility flue gases by reactive absorption can substantially reduce the emissions of the greenhouse gas co2. to test a new solvent (ait600) for this purpose, a small pilot plant was used. this paper presents the results of studies on chemical methods of...