We present a sample of 46 galaxy nuclei from 12 nearby (z < 4500km s) Hickson Compact Groups (HCGs) with a complete suite of 1–24μm 2MASS+Spitzer nuclear photometry. For all objects in the sample, blue emission from stellar photospheres dominates in the near-infrared through the 3.6μm IRAC band. Twenty-five of 46 (54%) galaxy nuclei show red, mid-infrared continua characteristic of hot dust pow...

Amulti-wavelength set of photometric data including UV (GALEX), optical, near-IR, infrared (Spitzer) and radio (VLA 20cm) images and spectroscopic observations are used to map the dust-obscured and unobscured star formation in the galaxy pair Arp 32. The system consists of an actively starforming galaxy and another one with depressed star formation. The most active galaxy has disrupted morpholo...

We present subarcsecond resolution imaging and spectroscopy of the BL Lac object 1ES 1741+196 and neighboring galaxies. Based on 2−dimensional modelling, the host galaxy of 1ES 1741+196 is a very bright and large elliptical galaxy (M R = −24.85, r e = 51.2 kpc) whose overall luminosity distribution deviates significantly from a de Vaucouleurs profile. It is one of the most luminous and largest ...

A systematic search for 22 GHz H2O megamaser emission is reported for 50 nearby (z <∼ 0.15) FR I galaxies. No detection was obtained, implying that ultraluminous H2O masers (LH2O > 10 3 L ) must be rare in early-type galaxies with FR I radio morphology. Despite higher radio core luminosities the detection rate for our sample is lower than in similar surveys of late-type Seyfert galaxies. This p...

The central kiloparsec of M81 has been observed in the CO(J=1–0) line and the 3 mm continuum at 100 pc resolution in an attempt to probe molecular gas, and to search for the nuclear inner Lindblad resonance (NILR), around the low-luminosity AGN M81. We found the following. (1) Molecular gas in the central kpc is mainly on a “pseudoring” or a spiral arm at a radius of about 500 pc. (2) The regio...

We propose that massive central objects form in the centers of the bars which must develop in young high-surface density galactic disks. Large-scale dynamics shuts off the growth of the central mass before it reaches ∼ 2% of the disk mass at the time, but this mass is sufficient to weaken the bar substantially. Subsequent evolution of the galaxy can either complete the destruction of the bar or...

Most radiation from galaxies containing active galactic nuclei (AGNs) is emitted not by the stars composing the galaxy, but from an active source at the galactic center, most likely a supermassive black hole. Of particular interest are radio galaxies, active galaxies that emit much of their radiation at radio wavelengths. Within each radio galaxy, an AGN powers a pair of collimated jets of rela...

Images covering the central 450×100 (∼ 8.0×2.0 kpc) of NGC5128 (Centaurus A) obtained using SCUBA at 850 and 450μm with beam sizes of 14.5 and 8 respectively, are presented. These data are compared with those obtained at other wavelengths, in particular the optical, mid-infrared, and far-infrared continuum. The sensitive 850 and 450μm images show that the submillimeter (submm) continuum morphol...