Evidence Against BALS in the X-ray Bright QSO PG1416-129

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dc.creatorGreen, Paul J.
dc.creatorAldcroft, Thomas L.
dc.creatorMathur, Smita
dc.creatorSchartel, Norbert
dc.date1997-02-24
dc.date.accessioned2026-07-07T02:22:59Z
dc.date.available2026-07-07T02:22:59Z
dc.descriptionRecent results from the ROSAT All Sky Survey, and from deep ROSAT pointings reveal that broad absorption line quasars (BALQSOs) are weak in the soft X-ray bandpass (with optical-to-X-ray spectral slope alpha_{ox}>1.8) in comparison to QSOs with normal OUV spectra (mean alpha_{ox}=1.4). One glaring exception appeared to be the nearby BALQSO PG1416-129, which is a bright ROSAT source showing no evidence for intrinsic soft X-ray absorption. We present here our new HST FOS spectrum of PG1416-129, in which we find no evidence for BALs. We show that the features resulting in the original BAL classification, based on IUE spectra, were probably spurious. On the basis of UV, X-ray and optical evidence, we conclude that PG1416-129, is not now, and has never been a BALQSO. Our result suggests that weak soft X-ray emission is a defining characteristic of true BALQSOs. If BALQSOs indeed harbor normal intrinsic spectral energy distributions, their observed soft X-ray weakness is most likely the result of absorption. The ubiquitous occurrence of weak soft X-ray emission with UV absorption (BALs) thus suggests absorbers in each energy regime that are physically associated, if not identical.
dc.description20 pages including 3 figures and 1 table, AAS latex, to appear in ApJ Vol. 484, July 20, 1997
dc.identifierhttps://arxiv.org/abs/astro-ph/9702207
dc.identifierhttp://arxiv.org/abs/astro-ph/9702207
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11078
dc.subjectAstrophysics
dc.titleEvidence Against BALS in the X-ray Bright QSO PG1416-129
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