ar X iv : a st ro - p h / 07 01 40 8 v 1 1 4 Ja n 20 07 Interstellar Iron and Silicon Depletions in Translucent Sight Lines

40 8 v 1 1 4 Ja n 20 07 Interstellar Iron and Silicon Depletions in Translucent Sight Lines

We report interstellar Fe II and Si II column densities toward six translucent sight lines (AV & 1) observed with the Space Telescope Imaging Spectrograph (STIS). The abundances were determined from the absorption of Si II] at 2335 Å, and several weak Fe transitions including the first reported detections of the 2234 Å line. We derive an empirical f -value for the Fe II λ2234 Å transition of lo...

ar X iv : a st ro - p h / 98 03 21 5 v 1 1 8 M ar 1 99 8 Search for Interstellar Water in the Translucent Molecular Cloud toward HD 154368

We report an upper limit of 9× 10 cm on the column density of water in the translucent cloud along the line-of-sight toward HD 154368. This result is based upon a search for the C-X band of water near 1240 Å carried out using the Goddard High Resolution Spectrograph of the Hubble Space Telescope. Our observational limit on the water abundance together with detailed chemical models of translucen...

ar X iv : a st ro - p h / 97 01 22 8 v 1 2 9 Ja n 19 97 Large - scale Structures revealed by Wavelet Decomposition 1

ar X iv : a st ro - p h / 07 01 89 4 v 1 3 1 Ja n 20 07 Molecular absorptions in high - z objects

Molecular absorption lines measured along the line of sight of distant quasars are important probes of the gas evolution in galaxies as a function of redshift. A review is made of the handful of molecular absorbing systems studied so far, with the present sensitivity of mm instruments. They produce information on the chemistry of the ISM at z ∼ 1, the physical state of the gas, in terms of clum...

ar X iv : a st ro - p h / 01 09 22 4 v 1 1 4 Se p 20 01 Interstellar O vi in the Large Magellanic Cloud

I summarize Far Ultraviolet Spectroscopic Explorer (FUSE) observations of interstellar O vi absorption towards 12 early-type stars in the Large Magellanic Cloud (LMC), the closest disk galaxy to the Milky Way. LMC O vi is seen towards all 12 stars with properties (average column densities, kinematics) very similar to those of the Milky Way halo, even though O/H in the LMC is lower by a factor o...