VLBI Observations of Supernova 1993J in M81

Details VLBI Observations of Supernova 1993J in M81 VLBI Observations of Supernova 1993J in M81

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.3104r&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #31.04; Bulletin of the American Astronomical Society, Vol. 25, p.1339

Astronomy and Astrophysics

Astronomy

Scientific paper

Global VLBI observations of SN1993J with 9 to 14 antennas for up to 18 hours show clearly that the supernova is expanding in a way consistent with being uniform. The radii (HWHM in microarcseconds) of circular Gaussians used in model fits to the visibility data, together with the observing wavelengths and epochs are: 57+/-4 (1.3cm, Apr. 26), 91(+17}_{-10) (1.3cm, May 16), 82+/-7 (3.6cm, May 16), 165(+8}_{-17) (2cm, Jun. 26), 161(+5}_{-6) (3.6cm, Jun. 26). A weighted least-squares linear fit gives an angular expansion velocity of 1.74+/-0.22 microarcseconds per day and an explosion date of Mar. 27.0+/-3.5 UT, the latter in agreement with results from optical data. A power-law fit constrained to go through a more precise optical zero point of Mar. 28.0 (Traummell et al., 93 ApJL 414, L21) gives an exponent of 0.97+/-0.04. Early optical spectra, e.g. measured with the INT on La Palma and the DDO near Toronto, indicate maximum expansion velocities of 17,500+/-500 km/s (measured at the blue edge of the Hα absorption trough). With the assumptions that a) the transverse velocity of the radio emitting region is 10+/-15% larger than the above optical velocity and that b) the brightness distribution of the supernova can be approximated by any model between a uniform disk and a very thin shell, we obtain a distance to M81 of 4.3+/-0.8 Mpc. All uncertainties are 1 standard deviations. We have continued the observations in intervals of about 6 weeks and should later be able to obtain detailed images of the supernova.

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