Simultaneous X-ray/VLA monitoring of NGC 253

We propose 5 observations of 10virgulkiloseconds each with XMM and Chandra of thenearby starforming galaxy NGCvirgul253. We plan to take these data simultaneouslywith data from the Very Large Array. This will give us a sample of severalbright Xray sources at a known distance with simultaneous radio coverage forthe first time. Simultaneous monitoring experiments are necessary forunderstanding the relation between Xray and radio luminosities at the poorlyunderstood bright end of the luminosity distribution, and going to othergalaxies should greatly increase the sample size of sources at theseluminosities. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]