Abstract
ON nine separate occasions between October 27, 1971, and January 6, 1973, the MIT instrument aboard OSO-7 scanned the region of sky within about 10° of the galactic centre. Subsequent analysis of this data, in the form of all-sky maps, led to the discovery of several previously unreported X-ray sources1. The most intense of these, MX1746–20, was found at α = 17 h 46.0 min.δ = −20° 22.2′ (1950.0) or, in galactic coordinates lII = 7.73°, bII = 3.76°. The 90% confidence contour for this position is a circle of radius approximately 0.26°. This uncertainty includes an estimate of the probable aspect error as well as statistical uncertainty.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Markert, T. H., et al., IAU Circ., No. 2765 (1975).
Clark, G. W., et al., Astrophys. J., 179, 263 (1973).
Clark, G. W., Markert, T. H., and Li, F.-K., Astrophys. J. Lett. (in the press).
Arp, H. C., in Galactic Structure (edit. by Blaauw, A., and Schmidt, M.), 401 (University of Chicago Press, 1965).
Canizares, C. R., and Neighbours, J. E., Astrophys. J. Lett. (in the press).
Giacconi, R., et al., Astrophys. J. Suppl., 27, 37 (1974).
Clark, G. W., Astrophys. J. Lett. (in the press).
Bahcall, J. N., and Ostriker, J. P., Nature, 256, 23–24 (1975).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
MARKERT, T., BACKMAN, D., CANIZARES, C. et al. Observations of X rays from near NGC6440. Nature 257, 32–33 (1975). https://doi.org/10.1038/257032a0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1038/257032a0
This article is cited by
-
The product of the globular cluster collapse
Astrophysics and Space Science (1992)
-
The core evolution of a globular cluster containing massive black holes
Astrophysics and Space Science (1990)
-
X-ray bursters and the x-ray sources of the galactic bulge
Space Science Reviews (1981)
-
Positions of three X-ray burst sources
Nature (1977)
-
Accretion onto neutron star: The X-ray spectra and luminosity
Astrophysics and Space Science (1977)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
