Results of a Radio Continuum Survey of Spiral Galaxies at 10.55 GHz

Radio continuum spectra of galaxies in the Virgo cluster region

“…These galaxies all possess active centers (LINER, HII, AGN) and are located within a radius of 2 • from the cluster center. We confirm the conclusion of Niklas et al (1995) based on a small number of galaxies that the spectral index of Virgo galaxies does not change significantly with projected cluster distance. There might be a trend that the scatter of the spectral indices increases with decreasing projected distance.…”

“…We have also included the measurements of Niklas et al (1995), which are marked in boldface. The columns of Table 3 are: (1) VCC name of the galaxy; (2) right ascension in B1950 coordinates; (3) declination in B1950 coordinates; (4) projected distance from the Virgo cluster center (M 87); (5) Hubble type; (6) Virgo cluster membership based on radial velocities (y/n); (7) flux density at 10.55 GHz; (8) flux density at 8.6 GHz; (9) flux density at 4.85 GHz; (10) flux density at 1.4 GHz; (11) flux density at 0.6 GHz; (12) FIR flux (see Eq.…”

“…They concluded that the radio luminosity function of Virgo cluster galaxies is consistent with that of isolated galaxies, whereas the Coma cluster galaxies show an excess of radio emissivity. Niklas et al (1995) investigated the behaviour of the radio-FIR correlation and the radio spectra in the Virgo cluster. They claim that galaxies that show an excess of radio emission are located close to the cluster center, whereas the spectra do not seem to be affected by the location of the galaxies in the cluster.…”

Structure and stellar population of ringed barred galaxy NGC 2336

“…However, IC 467 does not influence the structure and kinematics of NGC 2336 (Schneider & Salpeter 1992;Keel 1993). NGC 2336 has a non-active nucleus: strong nuclear emission has not been detected in either the optical (Tifft 1982;Heckman 1980), IR (Quillen et al 2001) or radio (Heckman 1980;Hummel et al 1985;Niklas et al 1995) wavelengths. The nucleus also has a non-starlike profile in the visual passband (van den Bergh 1995).…”

“…Observations in the 12-120 µm range were obtained by Wunderlich & Klein (1991), Keel (1993) and van Driel et al (1993). NGC 2336 has also been observed at radio wavelengths of: 2.6 mm (Young et al 1995), 2.8 cm (Niklas et al 1995), 6.3 cm (Heckman 1980;Niklas et al 1995) and 21 cm (see, e.g., Aaronson et al 1982 andvan Moorsel 1983). However, to the best of our knowledge, multicolor surface photometry of NGC 2336 has not yet been published.…”