The Quasar SDSS J105041.35+345631.3: Black Hole Recoil Or Extreme Double-Peaked Emitter?




Shields, Gregory A.
Rosario, D. J.
Smith, K. L.
Bonning, E. W.
Salviander, Sarah
Kalirai, J. S.
Strickler, R.
Ramirez-Ruiz, E.
Dutton, A. A.
Treu, T.

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The quasar SDSS J105041.35+345631.3 (z = 0.272) has broad emission lines blueshifted by 3500 km s(-1) relative to the narrow lines and the host galaxy. Such an object may be a candidate for a recoiling supermassive black hole, a binary black hole, a superposition of two objects, or an unusual geometry for the broad emission-line region. The absence of narrow lines at the broad line redshift argues against superposition. New Keck spectra of J1050+3456 place tight constraints on the binary model. The combination of large velocity shift and symmetrical H beta profile, as well as aspects of the narrow line spectrum, make J1050+3456 an interesting candidate for black hole recoil. Other aspects of the spectrum, however, suggest that the object is most likely an extreme case of a "double-peaked emitter." We discuss possible observational tests to determine the true nature of this exceptional object.



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Shields, Gregory A., D. J. Rosario, K. L. Smith, E. W. Bonning, S. Salviander, J. S. Kalirai, R. Strickler et al. "The quasar SDSS J105041. 35+ 345631.3: black hole recoil or extreme double-peaked emitter?." The Astrophysical Journal, Vol. 707, No. 2 (Dec., 2009): 936.