Abstract
FAIRALL recently identified a new Seyfert galaxy, designated F-9, from coarse spectra of a galaxy evident on an ESO Fast Blue Survey Plate1. Only limited data were presented, however, for example, a redshift was not given, nor was the galaxy spectroscopically classified (Seyfert type 1 or 2)2. In a search at MIT for possible catalogued optical counterparts to X-ray sources, I noticed that F-9 lies within the common intersection of both a 2A and 4U X-ray error box3, 4. Figure 1 shows the 2A error box and part of the (much larger) 4U error box overlaid on an ESO Fast Blue Survey Plate of the region around F-9. The apparent magnitude of F-9 is given as mag ∼ 13 (ref. 1). Because of its fuzzy perimeter, it is the most conspicuous object in the 2A error box.
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References
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RICKER, G. Is Fairall 9 an X-ray Seyfert galaxy?. Nature 271, 334 (1978). https://doi.org/10.1038/271334a0
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DOI: https://doi.org/10.1038/271334a0
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