Subarcsecond radio continuum mapping in and around the spiral galaxy NGC 3351 using MERLIN

Authors

  • Guillermo F. Hägele,

    Corresponding author
    1. Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049 Madrid, Spain
    2. Facultad de Cs. Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
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  • Yago Ascasibar,

    1. Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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  • Anita M. S. Richards,

    1. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL
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  • Mónica V. Cardaci,

    1. Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049 Madrid, Spain
    2. Facultad de Cs. Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
    3. XMM Science Operations Centre, European Space Astronomy Centre of ESA, PO Box 50727, 28080 Madrid, Spain
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  • Javier Vásquez,

    1. Facultad de Cs. Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
    2. Instituto Argentino de Radioastronomía (CCT-La Plata, CONICET), C.C.5., 1894 Villa Elisa, Argentina
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  • Ángeles I. Díaz,

    1. Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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  • Daniel Rosa González,

    1. Instituto Nacional de Astrofísica, Óptica y Electrónica, Tonantzintla, Apdo. Postal 51, 72000 Puebla, México
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  • Roberto Terlevich,

    Corresponding author
    1. Instituto Nacional de Astrofísica, Óptica y Electrónica, Tonantzintla, Apdo. Postal 51, 72000 Puebla, México
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  • Elena Terlevich

    Corresponding author
    1. Instituto Nacional de Astrofísica, Óptica y Electrónica, Tonantzintla, Apdo. Postal 51, 72000 Puebla, México
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E-mail: guille.hagele@uam.es

Research Affiliate, IoA, University of Cambridge, UK.

Visiting astronomer at IoA.

ABSTRACT

We report subarcsecond-scale radio continuum observations of a field of 35 × 22 arcmin2 centred in NGC 3351 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 H ii regions probably requires deeper observations.

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