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146 Chapter 5. Radio and optical observations patible between them. We also have obtained radio spectra and optical magnitudes of the sources. After a detailed analysis of the obtained data, we conclude that the sources 1RXS J001442.2+580201 and 1RXS J013106.4+612035 are good REXB candidates, while 1RXS J042201.0+485610 is not so promising due to its highly inverted spec- trum at high frequencies and its optical extended emission. A careful study of the optical counterpart of 1RXS J062148.1+174736 reveals it is extended, which points towards an extragalactic nature for this object. The situation is not clear in the case of 1RXS J072259.5−073131, because the optical data agrees with a microquasar nature, while the detected one-sided radio jet reaching arcsecond scales is most common in extragalactic sources. The last studied source, 1RXS J072418.3−071508, is an already identified quasar. Hence, two sources in our sample are very promising to be new microquasars in the Galaxy. The next logical step was to obtain optical spectroscopy of these sources, to unveil their galactic or extragalactic nature. Several attempts have been carried out in years 2000 and 2001, without success due to bad weather conditions, and a new attempt is in progress for autumn 2002. On the other hand, VLBI observations of the 6 sources studied here will be published soon (Ribó et al. 2002), and are reported in the next chapter.
Bibliography Cutri, R. M., Skrutskie, M. F., Van Dyk, S., et al. 2000, Explanatory Supple- ment to the 2MASS, Second Incremental Data Release, Caltech (available at http://www.ipac.caltech.edu/2mass/releases/second/doc/explsup.html) Deutsch, E. W. 1999, AJ, 118, 1882 Fender, R. P. 2001, MNRAS, 322, 31 Gregory, P. C., & Condon, J. J. 1991, ApJS, 75, 1011 Gregory, P. C., Scott, W. K., Douglas, K., & Condon, J. J. 1996, ApJS, 103, 427 Landolt, A.U. 1992, AJ, 104, 340 Laurent-Muehleisen, S. A., Kollgaard, R. I., Ryan, P. J., et al. 1997, A&AS, 122, 235 Monet, D. G., Bird, A., Canzian, B., et al. 1999, USNO-A2.0 CD-ROM (U.S. Naval Observatory, Washington DC) Motch, C., Guillout, P., Haberl, F., et al. 1998, A&AS, 132, 341 Perlman, E. S., Padovani, P., Giommi, P., et al. 1998, AJ, 115, 1253 Predehl, P., Burwitz, V., Paerels, F., & Trümper, J. 2000, A&A, 357, L25 Ribó, M., Ros, E., Paredes, J. M., Massi, M., & Martí, J. 2002, A&A, 394, 983 White, N. E., Nagase, F., & Parmar, A. N. 1995, The properties of X-ray binaries, in X-ray Binaries, ed. W. H. G. Lewin, J. van Paradijs, & E. P. J. van den Heuvel (Cambridge Univ. Press, Cambridge), 1 147
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UNIVERSITAT DE BARCELONA Departamen
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Per a la meva neboda Blanca, que va
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feina no presentada en aquesta tesi
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desfogar-nos conjuntament, per la s
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From the scientifical point of view
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Gràcies a la meva germana Nàdia,
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ii CONTENTS I Discovery and study o
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iv CONTENTS II A search for new mic
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vi CONTENTS
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viii Resum de la tesi d’Eddington
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x Resum de la tesi imprescindible p
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xii Resum de la tesi dels sistemes
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xiv Resum de la tesi un comportamen
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xvi Resum de la tesi MilliARC SEC 4
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xviii Resum de la tesi per poder de
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xx Resum de la tesi valors força s
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xxii Resum de la tesi 2. D’entre
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xxiv Resum de la tesi pano Alemán
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xxvi Resum de la tesi 3.3 Observaci
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xxxii BIBLIOGRAFIA
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28 BIBLIOGRAPHY Lewin, W. H. G., va
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Chapter 2 Multiwavelength approach
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2.3. An interesting target in the s
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2.4. The radio counterpart: NVSS J1
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2.6. The X-ray counterpart: RX J182
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2.7. The γ-ray counterpart: 3EG J1
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2.7. The γ-ray counterpart: 3EG J1
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2.8. A proposed scenario to explain
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Figure 2.23: Scenario where the mul
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2.9. Conclusions 87 8. We have carr
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Bibliography Blandford, R. D., & K
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BIBLIOGRAPHY 91 Merck, M., Bertsch,
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Chapter 3 LS 5039 as a runaway micr
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