Synchrotron radiation losses in the post-starburst galaxy NGC 1569

Details Synchrotron radiation losses in the post-starburst galaxy NGC 1569 Synchrotron radiation losses in the post-starburst galaxy NGC 1569

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..109i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 109-115.

Astronomy and Astrophysics

Astrophysics

55

Dwarf Galaxies, Irregular Galaxies, Nonthermal Radiation, Starburst Galaxies, Synchrotron Radiation, Astronomical Maps, Radio Galaxies, Star Formation

Scientific paper

The non-thermal radio emission of the irregular dwarf galaxy NGC 1569 has a high-frequency cutoff at 8±1 GHz, indicating significant relativistic electron energy losses. The large change in spectral index (Δα ≥ 1) rules out energy losses by electron diffusion, but is explained by a sharp decrease in relativistic electron injection rates about 5×106 yr ago, followed by synchrotron radiation losses. In turn, this behaviour reflects the discontinuous star formation history of NGC 1569. At present, NGC 1569 is the only galaxy known to show such a behaviour in its integrated properties. The consequently transient radio emisison of NGC 1569 (timescale of order 2×107 yr) suggests a new tool to study recent bursts of star formation in dwarf galaxies.

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