Sub-arcsecond radio continuum mapping in and around the spiral galaxy NGC3351 using MERLIN

GUILLERMO F. HÄGELE ; YAGO ASCASIBAR; ANITA RICHARDS; MÓNICA V. CARDACI; JAVIER VÁSQUEZ; ÁNGELES I. DÍAZ; DANIEL ROSA-GONZÁLEZ; ROBERTO TERLEVICH; ELENA TERLEVICH

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2010 vol. 406 p. 1675 - 1686

0035-8711

We report subarcsecond-scale radio continuum observations of a field of 35 × 22 arcmin2centred in NGC3351 obtained with the Multi-Element Radio Linked Interferometer Network(MERLIN). We found 23 radio sources in this field, six of which are projected within the D25 isophote of the galaxy and three are located inside the central 100 arcsec in radius. Two of these three are significantly extended, while the third one is relatively compact. This one is the only source with a previously detected counterpart at other wavelengths and could constitute the radio counterpart of a young supernova remnant (SNR). The other two are probably related to jets from a background active galactic nucleus.We are not able to detect individual supernovae (SNe) or SNRs in the central region (r < 600 pc) of the galaxy. This could imply that the ionizing populations of the circumnuclear star-forming regions are too young (less than a few Myr) to host SNe. Also, the diffusion length of the relativistic electrons in the interstellar medium associated with the SN from previous events of star formation seems to be larger than our maximum resolution of 50 pc in radius. Detecting the thermal bremsstrahlung emission from the circumnuclear HII regions probably requires deeper observations.