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Contribution of intermediate luminosity X-ray galaxies to the background: Anon 0945–30

Abstract

EVIDENCE that the galaxy A0945 – 30 is a new extragalactic X-ray source has been found from an analysis of rotating modulation collimator (RMC)1 quick-look data collected from 53 orbits of the SAS 3 X-ray observatory during the period 26 February–2 March 1978. The exposure is approximately 7 × 106 cm2 s. The galaxy lies within the error boxes quoted for 4U0945 – 30 and 2A0946 – 310 but is not one of the previously suggested candidates. A faint star alongside the galaxy also lies in the 90% confidence X-ray source error circle (Fig. 1). The data are consistent with a point source2. The flux from the source varied by a factor of about five during the period of our observation.

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References

  1. Schnopper, H. W. et al., Astrophys. J. Lett., 161, L161–167 (1970).

    Article  ADS  Google Scholar 

  2. Delvaille, J. P., Epstein, A. & Schnopper, H. W. Astrophys. J. Lett. 219, L81–83 (1978).

    Article  ADS  Google Scholar 

  3. Daltabuit, E. & Meyer, S. Astr. Astrophys. 20, 415–424 (1972).

    ADS  CAS  Google Scholar 

  4. Heiles, C. & Jenkins, E. B. Astr. Astrophys. 46, 333–360 (1976).

    ADS  CAS  Google Scholar 

  5. Ward, M. J., Wilson, A. S., Penston, M. V., Elvis, M., Maccacaro, T. & Tritton, K. P. Astrophys. J. (in the press)

  6. Rubin, V. C. Astrophys. J. Lett. 224, L55–L57 (1978).

    Article  ADS  CAS  Google Scholar 

  7. Huchra, J. P. (in preparation)

  8. Wilson, A. S., Penston, M. V., Fosbury, R. A. E. & Boksenberg, A. Mon. Not. R. astr. Soc. 177, 673–685 (1976).

    Article  ADS  CAS  Google Scholar 

  9. Ricker, G. et al. (in preparation).

  10. Huchra, J. P. Astrophys. J. Suppl. 35, 171–195 (1977).

    Article  ADS  CAS  Google Scholar 

  11. Gursky, H. & Schwartz, D. A. A. Rev. Astr. Astrophys. 15, 541–568 (1977).

    Article  ADS  Google Scholar 

  12. Avni, Y. Astr. Astrophys. 63, L13–L16 (1978).

    ADS  Google Scholar 

  13. Schwartz, D. A., Hudson, H. S. & Peterson, L. E. Astrophys. J. 162, 431–437 (1970).

    Article  ADS  Google Scholar 

  14. Davis, M., Geller, M. J. & Huchra, J. P. Astrophys. J. 221, 1–18 (1978).

    Article  ADS  Google Scholar 

  15. Oemler, A. Astrophys. J. 194, 1–19 (1974).

    Article  ADS  Google Scholar 

  16. Turner, E. L. & Gott, J. R. Astrophys. J. Suppl. 32, 409–427 (1976).

    Article  ADS  Google Scholar 

  17. Forman, W. et al. Astrophys. J. Suppl. (in the press).

  18. Cooke, B. A. et al. Mon. Not. R. astr. Soc. 182, 455–470 (1978).

    Google Scholar 

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SCHNOPPER, H., DAVIS, M., DELVAILLE, J. et al. Contribution of intermediate luminosity X-ray galaxies to the background: Anon 0945–30. Nature 275, 719–721 (1978). https://doi.org/10.1038/275719a0

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