864 research outputs found
Some recent infrared spectroscopy of interstellar processes
The potential which infrared spectroscopic techniques provide for studying interstellar process is demonstrated. Several examples are given. The data were obtained at UKIRT, using its frequency-chopped Fabry-Perot spectrometer and its seven-channel cooled grating spectrometer
Out of plane effect on the superconductivity of Sr2-xBaxCuO3+d with Tc up to 98K
We comment on the paper published by W.B. Gao, Q.Q. Liu, L.X. Yang, Y.Yu,
F.Y. Li, C.Q. Jin and S. Uchida in Phys. Rev. B 80, 094523 (2009) and give
alternate explanations for the enhanced superconductivity. The enhanced onset
Tc of 98K observed upon substituting Ba for Sr is attributed to optimal oxygen
ordering rather than to the increase in volume. Comparison with La2CuO(4+x)
samples suggest that the effect of disorder is overestimated
The Interstellar Medium of IRAS 08572+3915 NW: H3+ and Warm High Velocity CO
We confirm the first detection of the molecular ion H3+ in an extragalactic
object, the highly obscured ultraluminous galaxy IRAS 08572+3915 NW. We also
have detected absorption lines of the fundamental band of CO in this galaxy.
The CO absorption consists of a cold component close to the systemic velocity
and warm, highly blueshifted and redshifted components. The warm blueshifted
component is remarkably strong and broad and extends at least to -350 km/s.
Some analogies can be drawn between the H3+ and cold CO in IRAS08572+3915 NW
and the same species seen toward the Galactic center. The profiles of the warm
CO components are not those expected from a dusty torus of the type thought to
obscure active galactic nuclei. They are probably formed close to the dust
continuum surface near the buried and active nucleus and are probably
associated with an unusual and energetic event there.Comment: 21 pages, 4 postscript figures, accepted by Ap
- …