Supernova 1994I in NGC 5194

Astronomy and Astrophysics – Astronomy

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Scientific paper

R. A. Sramek and M. P. Rupen, National Radio Astronomy Observatory; S. D. Van Dyk, University of California at Berkeley; K. W. Weiler, Naval Research Laboratory; and N. Panagia, Space Telescope Science Institute, report: "New observations with the Very Large Array in its highest-resolution (A) configuration have detected SN 1994I for the first time at 2 and 6 cm, and show that the 1.3- and 3.6-cm flux densities are rising rapidly. Following are listed the time of observation (UT), the frequency (GHz), the flux density (mJy), and the rms noise in image (mJy/beam): Apr. 4.11, 8.44, 0.91 +/- 0.16, 0.054; 4.15, 14.94, 3.16 +/- 0.52, 0.11; 4.16, 22.46, 4.64 +/- 0.80, 0.42; 5.29, 1.43, <0.28 (3-sigma), 0.093; 5.32, 22.46, 13.1 +/- 3.5, 0.26; 5.36, 14.94, 7.15 +/- 1.05, 0.14; 5.38, 8.44, 1.66 +/- 0.15, 0.044; 5.40, 4.86, 0.57 +/- 0.08, 0.062. The uncertainties include both random and systematic (calibration) errors. The basic behavior---the flux densities rising rapidly, first at higher frequencies and later at lower frequencies---is consistent with the circumstellar interaction model and with the behavior of previously-known radio supernovae (as discussed, e.g., in Weiler et al. 1986, Ap.J. 301, 790)."

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