Abstract
The Einstein X-ray Imaging Instruments have been used to explore, down to an unprecedented sensitivity, the X-ray behavior of 7 high-energy γ-ray sources discovered by the COS-B satellite.
32 low latitude (|b| < 5°) IPC fields, mosaic-arranged to cover the few-square-degrees COS-B error circles, yielded 30 soft X-ray sources, the fluxes of which range from ~ 1/100 to few UFU, and no diffuse features.
While the density of ~ 1 source/IPC field is consistent with the value found at higher latitudes, the percentage of ‘stellar’ identifications among these low-latitude sources is significantly higher than in non-galactic-biased samples. Unfortunately, the positional accuracy achieved with the IPC does not allow astronomical identification in the absence of obvious counterpart(s). However, after the exploratory coverage, the IPC data were used, when possible, to point out potentially interesting targets for the HRI instrument capable of an accuracy of ~ 3 arc sec.
Due to the misfortunes which occurred to the Einstein satellite, this time-consuming process was feasible only in two cases: within the error circle of 2CG 135 + 01, the radio variable star LSI61.303 was pinpointed by the HRI, while the HRI exposure of the brightest X-ray source discovered in 2CG 195 + 04 (Geminga) positioned a source in an empty POSS field. The latter case will be presented and the nature of the X-and γ(?)-ray source briefly discussed.
Proceedings of the XVIII General Assembly of the IAU: Galactic Astrophysics and Gamma-Ray Astronomy, held at Patras, Greece, 19 August 1982.
The X-ray data used in this paper were collected as a part of the Guest Observer Program of the Einstein Observatory.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Allen, C. W.: 1973, Astrophysical Quantities, 3rd ed., Athlone Press, London.
Apparao, K. M. V., Bignami, G. F., Maraschi, L., Helmken, H., Margon, B., Hjellming, R., Bradt, H. V., and Dower, R. G.: 1978, Nature 275, 298.
Bignami, G. F. and Hermsen, W.: 1982, to appear in Ann. Rev. Astron. Astrophys. 21.
Bignami, G. F., Caraveo, P. A., Lamb, R. C., Markert, T. H., and Paul, J. A.: 1981, Astrophys. J. 247, L85.
Bignami, G. F., Caraveo, P. A., and Lamb, R. C.: 1983, Astrophys. J. Letters, in press.
Bradt, H. V. D. and McClintock, J. E.: 1982, to appear in Ann. Rev. Astron. Astrophys. 21.
Caraveo, P. A.: 1981, Phil. Trans. Roy. Soe. London A301, 523.
Caraveo, P. A., Bignami, G. F., Paul, J. A., Marano, B., and Vettolani, J. P.: 1981, Space Sci. Rev. 30, 301.
Cesarky, C. J. and Montmerle, T.: 1983, Space Sci. Rev. 36, 173 (this volume).
Chanan, G. A., Margon, B., and Downes, R. A.: 1981, Astrophys. J. 243, L5.
D’Amico, N.: 1983, Space Sci. Rev. 36, 195 (this volume).
Giacconi, R., Branduardi, G., Briel, U., Fabricant, D., Feigelson, E., Forman, W., Gorenstein, P., Grindlay, J., Gursky, J., Harnden, F. R., Henry, J. P., Jones, C., Kellogg, E., Koch, D., Murray, S., Schraier, E., Seward, F., Tananbaum, H., Topka, K., van Speybroeck, L., Holt, S. S., Becker, R. H., Boldt, E. A., Serlemitsos, P. J., Clark, G., Canizares, C., Markert, T., Novick, R., Helfand, D., and Long, K.: 1979, Astrophys. J. 230, 540.
Gregory, P. C., Taylor, A. R., Crampton, D., Hutchings, J. B., Hjellming, R. M., Hogg, D., Hvatum, H., Gottlieb, E. W., Feldman, P. A., and Kwok, S.: 1979, Astron. J. 84, 1030.
Helfand, D. J.: 1981, in W. Sieber and R. Wielebinsky (eds.),‘Pulsars’, IAU Symp. 95, 343.
Helfand, D. J. and Caillault, J. P.: 1982, Astrophys. J. 253, 760.
Hermsen, W., Bennett, K., Bignami, G. F., Boella, G., Buccheri, R., Higdon, J. C., Kanbach, G., Lichti, G. G., Masnou, J. L., Mayer-Hasselwander, H. A., Paul, J. A., Scarsi, L., Swanenburg, B. N., Taylor, B. G., and Wills, R. D.: 1977, Nature 262, 494.
Hertz, P. and Grindlay, J. E.: 1981, Bull. Am. Astron. Soc. 13, 787.
Lamb, R. C., Markert, T. H., Hartman, R. C., Thompson, D. J., and Bignami, G. F.: 1980.Astrophys. J. 239, 651.
Maraschi, L. and Treves, A.: 1983, Space Sci. Rev. 36, 161 (this volume).
Maraschi, L., Tanzi, E. G., and Treves, A.: 1981, Astrophys. J. 248, 1010.
Markert, T. H., Lamb, R. C., Hartman, R. C., Thompson, D. J., and Bignami, G. F.: 1981, Astrophys. J. 248, L17.
Masnou, J. L., Bennett, K., Bignami, G. F., Bioemen, J. B. G. M., Buccheri, R., Caraveo, P. A., Hermsen, W., Kanbach, G., Mayer-Hasselwander, H. A., Paul, J. A., and Wills, R. D.: 1981,17 th International Cosmic Ray Conference 1, 177.
Montmerle, T.: 1979, Astrophys. J. 231, 95.
Montmerle, T.: 1981, Phil. Trans. Roy. Soc. London A301, 505.
Montmerle, T., Koch-Miramond, L., Falgarone, E., and Grindlay, J. E.: 1983, Astrophys. J. 269, 182.
Seward, F. D. and Chelebowski, T.: 1982, Astrophys. J. 256, 530.
Sieber, W., and Schlickeiser, R.: 1982, Astron. Astrophys. 113, 314.
Singh, K. P., Apparao, K. M. V., and Manchanda, R. K.: 1982, Astrophys. Space Sci. 82, 477.
Swanenburg, B. N., Bennett, K., Bignami, G. F., Buccheri, R., Caraveo, P., Hermsen, W., Kanbach, G., Lichti, G. G., Masnou, J. L., Mayer-Hasselwander, H. A., Paul, J. A., Sacco, B., Scarsi, L., and Wills, R. D.: 1981, Astrophys. J. Letters 243, L69.
Taylor, A. R. and Gregory, P. C.: 1982, Astrophys. J. 255, 210.
Topka, K., Avni, Y., Golub, P., Harnden, F. R., Rosner, R., and Vaiana, G. S.: 1982.Astrophys. J. 259, 677.
Vaiana, G. S., Cassinelli, J. P., Fabbiano, G., Giacconi, R., Golub, L., Gorenstein, P., Haisch, B. M., Harnden, F. R., Johnson, H. M., Linsky, J. L., Maxson, C. W., Mewe, R., Rosner, R., Seward, F., Topka, K., and Zwaan, C.: 1981, Astrophys. J. 245, 163.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1983 D. Reidel Publishing Co., Dordrecht and Boston
About this paper
Cite this paper
Caraveo, P.A. (1983). A Search for Counterparts of Selected Cos-B Galactic Gamma-Ray Sources: The X-Ray Survey and Optical Identifications. In: Morfill, G.E., Buccheri, R. (eds) Galactic Astrophysics and Gamma-Ray Astronomy. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7208-7_14
Download citation
DOI: https://doi.org/10.1007/978-94-009-7208-7_14
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-009-7210-0
Online ISBN: 978-94-009-7208-7
eBook Packages: Springer Book Archive