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Hi Bojan,
A very interesting result. I think the baseline raise around your marked peak is a good indication that what you are seeing is a source composed of lots of little sources. This is some indication that it might be extrasolar.
What is the BW of your SA ? From the header I read 50kHz span, which makes the marked source 1420.3125 MHz, with a span of about 8kHz across the shoulders.
With the galactic rotational velocity of ~100km/sec, we would expect that your detector would pick up the galaxy's hydrogen line anywhere between 1419.8MHz and 1420.7MHz depending on whether the bit you are pointing at is approaching us or receding from us (or not doing either). So what you show is consistent with the 21cm hydrogen line, with a bit of spread due to you sampling stuff around an area rather than a single star. The effective field of view of your radio telescope would be a good thing to know.
Caveat:- I am not a radio astronomer :-)
Keep us posted !!
Regards,
Tony Barry
WSAAG
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