In this work we investigate p-mode power variation with solar atmosphere. To this aim, we use THÉMIS observations of the Na D1 (λ5896 Å) and K (λ7699 Å) spectral lines. While the formation heights of the K spectral line are essentially located in the photospheric layer, the formation heights of the Na D1 line span a much wider region: from

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Using 21 cm observations of Complex H with the Green Bank Radio Telescope, we have derived its LSR velocity of ˜ 200 km s-1 and an H I mass of 7.5× 107 M&sun;. This gives useful support to the scenario in which the Galactic disk is being built up by the continual accretion of clouds of this type from the intracluster medium of the Local Group

NRAO 150 -- a compact and bright radio to mm source showing core/jet structure-- has been recently identified as a quasar at redshift 1.52 through a near-IR spectral observation. To compute quantitative estimates of the basic physical properties of the jet in the source, we have analysed the ultra-high-resolution images from a new sub

Targets were selected from existing V- and I-band photometry obtained as part of the ongoing ARAUCARIA Cepheid search project whose results have been reported in Pietrzynski et al. (2006, Cat. ). These data were taken with the Warsaw 1.3m telescope at Las Campanas Observatory. We obtained spectra for ~200 objects with FORS2 (FOcal Reducer and low

Inspired by recent work on feedback in disk galaxies (Efstathiou 2000; Silk 2003) and on the angular momentum distribution in simulated gas halos (Sharma & Steinmetz 2005), a fully dynamic model of disk galaxy formation and evolution has been developed. This is used to demonstrate how observed galactic systems could have formed from halos similar