Images at 20cm and the Spectrum Index of NGC2997

Details Images at 20cm and the Spectrum Index of NGC2997 Images at 20cm and the Spectrum Index of NGC2997

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005chjaa...5...49m&link_type=abstract

Chinese Journal of Astronomy and Astrophysics, Volume 5, Issue 1, pp. 49-56 (2005).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We present total intensity maps of the galaxy NGC 2997 at frequencies 1435.1 MHz (λ21 cm) and 1652.4 MHz (λ18 cm) observed with the Very Large Array (VLA). The high spatial resolution allows us to distinguish two dominant arms. Using multi-frequency data, we separate the thermal and non-thermal contributions to the radio emission. The thermal emission is about 35% of the total emission at λ3 cm. We use it to estimate a space-averaged thermal electron density, langlen erangle~0.049 cm-3 . The spectral index map shows that the optical arms and the central part of the galaxy have flatter spectra. We also determine the flux densities of 22 radio sources in the field-of-view of 25'.

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