4 papers
Limb Shift of the Fe I 6569 Ã line on the Sun
H. C. Yu, M. D. Ding, J. Hong +2
The convective motions of solar granules generate a center-to-limb variation of Doppler velocity in the photospheric lines, known as the limb shift effect. This study presents a co…
Faint absorption of the ground state hyperfine-splitting transitions of hydroxyl at 18 cm in the Galactic Disk
M. R. Rugel, H. Beuther, J. D. Soler +15
The interstellar hydride hydroxyl (OH) is a potential tracer of CO-dark molecular gas. We present new absorption line observations of OH at 18-cm wavelength towards four continuum…
A multi-scale investigation into the diagnostic potential of the HCN/HCO ratio for AGN and starburst activity in nearby galaxies
J. Butterworth, S. Viti, Y. Wang
(Abridged) The identification of AGN and SB regions in galaxies is crucial for understanding the role of various physical processes in galaxy evolution. Molecular line ratios, such…
Wavelength modulation laser spectroscopy of NO at 17 m
Y. Wang, J. Rodewald, O. Lopez +4
Using a mid-infrared quantum cascade laser and wavelength modulation absorption spectroscopy, we measure the frequencies of ro-vibrational transitions of NO in the 17 m reg…