Spectrophotometry of NAB 0137-01 - The 'other' X-ray QSO

Details Spectrophotometry of NAB 0137-01 - The 'other' X-ray QSO Spectrophotometry of NAB 0137-01 - The 'other' X-ray QSO

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211l...5m&link_type=abstract

Astrophysical Journal, vol. 211, Jan. 1, 1977, pt. 2, p. L5-L8.

Mathematics

Logic

4

Astronomical Photometry, Emission Spectra, Quasars, Spectrophotometry, X Ray Sources, Astronomical Spectroscopy, Balmer Series, Forbidden Bands, Line Spectra, Red Shift

Scientific paper

Results are reported for spectrophotometry and photometry of the quasar NAB 0137-01, the suggested optical counterpart of the faint X-ray source 3U 0138-01. The prominent Balmer emission spectrum plus strong forbidden lines of Ne III and O III yield a redshift of 0.334; two other apparently genuine emission features are discussed which have no convincing identifications. The He II line at 4686 A and the O III Bowen lines are found to be lacking in the spectrum, and the absolute magnitude of the quasar is estimated to be -24.6. It is noted that the spectrum of the only confirmed X-ray quasar, 3C 273, is also characterized by the absence of 4686-A and Bowen-line emission. This similarity is considered as morphological evidence which strengthens the identification of NAB 0137-01 with 3U 0138-01.

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