V445 Puppis as a Recurrent Radio Source

Michael Rupen, Vivek Dhawan, & Amy Mioduszewski

Last update: 11 August 2009

All error bars are 1sigma unless otherwise noted.

Flux Density Evolution

The figure below shows the evolving radio flux density of V445 Puppis. Note the series of radio flares superposed on the overall decay.

Flux density evolution (17dec04)
Flux density evolution #2 (17dec04)

Spectral Evolution

The radio spectra are shown below. A power law (as expected for optically-thin synchrotron emission) would appear as a straight line sloping downwards on this plot. Optically-thin thermal (free-free) emission would be roughly flat (nu^{-0.1}). Note that atmospheric effects introduce additional uncertainty in the data above 15 GHz. The lines are power laws going through the 8.5 GHz data, intended to guide the eye -- these are not fits.

radio spectra (17dec04) radio spectra #2 (17dec04) radio spectra #3 (17dec04)

The source appears too complicated at present for any but the simplest fits.

Sample resolved images

The figures show a couple examples of our A configuration 8.5 GHz data.

radio image (17dec04)MJD 53279= 1oct04
radio image (17dec04)MHD 53370= 31dec04


This figure shows the measured position (Gaussian fits) as a function of time. It's a little hard to make out since there are sometimes multiple fits on the same MJD, but I thought I might as well include it...

radio positions (28jan0o5

References for V445 Puppis

See this list of Papers and circulars.


Please send any questions, comments, or suggestions to Michael Rupen at the e-mail address given below.

Last modified 11 August 2009