CIRCUMNUCLEAR STAR FORMATION IN THE BARRED GALAXY NGC-1022

Observations of ring like structures around the compact nucleus of a bar galaxy are useful for determining whether the structure is at the expected location of a resonance and also whether there is star formation in them. We observed the barred spiral galaxy NGC 1022 in the radio continuum at 20, 6, and 2 cm, in CO(1-0) and CO(2-1) and in the near infrared J, H and K bands. No evidence was found for a circumnuclear ring like structure either from our radio continuum or our CO observations. Radio continuum emission is only detected from the central 20" of the galaxy, in a compact core and a weaker second component to the north. The spectral indices of the integrated fluxes at the three wavelengths are flatter than an average disk spectral index, alpha-disk congruent-to -0.75, namely alpha-20(6) = -0.52, alpha-20(2) = -0.23 and alpha-6(2) = -0.03. From our millimeter observations we estimate a molecular hydrogen mass within a diameter of 3.3 kpc of 1 10(9) M.. The observed near-infrared colors are J-H = 0.82 and H-K = 0.35. From our observations with an aperture of 14", together with smaller aperture observations by Devereux et al. we estimate a mass within 200 pc of 2 10(9) M..