Ximi Elga


Request PDF on ResearchGate | XTE J+ | Goddard Space Flight Center reports the serendipitous The best-fit position is R.A. 19h 08m 50s, Decl. IAUC cf; cg; cc; XTE J+ The following SN cf is located at R.A. = 12h54m31s, Decl. = o51’24”.8 (equinox ) . The best-fit position is R.A. = 19h08m50s, Decl. seen between and Hz. The authors conclude that XTE J+ is a new blackhole candidate.

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IAUC cf; cg; cc; XTE J+

I give two versions of the 4may02 image, the first with the same contours as the previous images, the second using the lower noise level of the 4may02 observations, so that one can see some negative contours. The two other northern crosses are the positions of the northern component from 23apr02 and 1may02; these agree perfectly within the small errors devl the 4may02 position.

By 4may02 the southern source seems to have faded by 0944deco it is marginally present peaking at 0. There’s also the simple statistical uncertainty for sources which are only sigma; with a beam of x mas on 1may02, this corresponds to mas.


Please do not use these results without first contacting M. In several observations the two overlap and you can only see a solid dot.

The big circle in the 0. We are continuing to observe the source every few days, but will soon 6may02 begin to lose spatial resolution as the VLA antennas are moved to the next-smaller configuration BnA.

Central Bureau for Astronomical Telegrams

As to the southern dot: This is however an argument for a deeper, HRC observation Unfortunately those data were taken in a narrower bandwidth mode to allow imaging the large initial X-ray error circle, resulting in lower sensitivity.

These are based on inverted-parabola fits to find the peak, and may be biased for extended sources. These are naturally-weighted images, which bring out the southern component in particular more strongly.


On 23apr02 and 1may02 the 8. This is partly because an offset would be so intrinsically dwcl that believing it would require fairly overwhelming evidence. The open circles represent the peak flux density; the solid dot show the integrated flux density over a small region including roughly a half-beam dfcl radius” around the regions of clearly-real emission. The two small crosses to the south represent the southern component as measured on those same days.


I am currently re-analyzing the earlier data to see whether there is any similar indication of an extension. Please send any questions, comments, or suggestions to Michael Rupen at the e-mail address given below.

In both cases I’ve superposed some interesting positions. The positional agreement between those and the slight southern extension hinted at on 4may02 makes me think that that extension is real. If it’s not, given the rather high noise level of the initial maps, the southern dot could conceivably have been recl forever, hiding below the noise floor.

My reading of the Chandra position is that it is basically coincident with the radio source. The upper limits correspond to 3-sigma. These results are preliminary, and provided here primarily to aid other observers.