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Universitat de - Departament d'Astronomia i Meteorologia ...

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Chapter 7<br />

Summary<br />

After a <strong>de</strong>tailed analysis of our data, we show in Table 7.1 a summary of the results<br />

obtained after the VLA and optical observations presented in Chapt. 5, and the<br />

EVN+MERLIN observations reported in Chapt. 6.<br />

As can be seen, 1RXS J001442.2+580201 and 1RXS J013106.4+612035 are<br />

promising microquasar candidates. 1RXS J042201.0+485610 is probably of thermal<br />

nature due to its highly inverted spectrum at high radio frequencies, and we also note<br />

its exten<strong>de</strong>d appearance at optical wavelengths. 1RXS J062148.1+174736 is proba-<br />

bly extragalactic due to the exten<strong>de</strong>d optical counterpart. 1RXS J072259.5−073131<br />

displays a bent one-si<strong>de</strong>d jet, which is a common property in blazars. Finally, the<br />

source 1RXS J072418.3−071508 is an already i<strong>de</strong>ntified quasar.<br />

We note that none of the 6 sources studied here appears in the Third EGRET<br />

Catalog of high-energy γ-ray sources.<br />

We point out that 1RXS J072259.5−073131 is bright enough at radio wave-<br />

lengths to attempt an H i absorption experiment, that could allow to <strong>de</strong>termine if<br />

this source is galactic or not. In any case, optical spectroscopic observations of the<br />

first five sources are in progress for autumn 2002, to clearly unveil their galactic or<br />

extragalactic nature.<br />

Finally, the two sources belonging to Group 1 that have not been observed yet,<br />

namely 1RXS J181119.4−275939 and 1RXS J185002.8−075833 will be eventually<br />

studied in the future, together with Group 2 sources.<br />

167

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