We present imaging of molecular gas emission in the star-forming spiral galaxy NGC 6946. Our 12 CO(1-0) and 12 CO(3-2) images, made at 22 ′′ resolution with the IRAM 30-m and the Heinrich Hertz 10-m radio telescopes, are the most extensive observations of molecular gas in this galaxy and are among the most extensive observations of molecular gas in any spiral galaxy. The 12 CO(1-0) emission sho...

We present new VLA observations of Neptune at 3.55 and 20.1 cm. The disk-averaged brightness temperatures are 191.2 6 K at 3.55 cm, and 276.4 -+ 10 K at 20.1 cm. These values are consistent with thermal spectra of the planet. We further present a comparison between Uranus and Neptune's spectrum, using improved atmospheric models for both planets. We improved the old models by including microwav...

The extraplanar diffuse ionized gas (eDIG) in 17 nearby, edge-on disk galaxies is studied using deep Taurus Tunable Filter Hα and [N II] λ6583 images and conventional interference filter Hα + [N II] λ6548, 6583 images which reach flux levels generally below ∼ 1 × 10−17 erg s−1 cm−2 arcsec−2. [N II] λ6583/Hα excitation maps are available for 10 of these objects. All but one galaxy in the sample ...

Context. Protoplanetary disks start their lives with a dust free inner region where the temperatures are higher than the sublimation temperature of solids. As the star illuminates the innermost particles, which are immersed in gas at the sublimation edge, these particles are subject to a photophoretic force. Aims. We examine the motion of dust particles at the inner edge of protoplanetary disks...

Glass disks, prepared by sintering finely pulverized glass in a suitable mold (Bruce and Bent, 1931; Kirk, Craig and Rosenfels, 1934; Shatenshtein, 1929) have found applications in the fields of chemistry (Prausnitz, 1924, 1929 and 1932), microchemistry (Kirk, 1933) and pharmacy (Prausnitz, 1930). As far as is known, there is no account in the literature of their employment in bacteriological w...