An analysis of the IRAS data for a sample of classical (optically selected) Seyfert galaxies is presented. The IRAS fluxes at 25 micron, 60 micron, and 100 micron are found to be uncorrelated or only very weakly correlated with the UV/Optical continuum flux and the near and mid IR flux at 3.5 and 10 microns. To investigate the possibility that star

The authors present the preliminary results of a search for near-infrared counterparts of compact H II regions and/or H2O masers in the Galactic Plane, probably associated with IRAS sources. J, H, K, L and M photometry of 10 new detections is reported.

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Using spectroscopic observations at relatively high resolution (Δλ ≡ 0.35 Å) in the region within 30 arcseconds of the nucleus of NGC 6946 the authors have found clear evidence of a strong expansion, with velocities of order 100 km s-1. By comparison with intensity maps in H I (21 cm) H2 (CO 2.6 mm) and Hα taken from the literature the authors

The authors have mapped the nearby flocculent spiral galaxy in the visible U, B and V bands, as well as in the near infrared J, H and K bands, with a linear resolution of 900 pc. The galaxy is found to have two principal current centres of large-scale star formation, signposted by centres of ultraviolet and blue flux. One is in the nucleus, defined

The paper presents isophotal maps of the distribution of the flux emitted by transitions of various molecular species in the spectrum of Comet Halley at a heliocentric distance of 1.92 AU, after perihelion. The observations were made at the Observatorio del Roque de los Muchachos, in La Palma, using the RGO Image Photon Counting System attached to