THE QUASAR SDSS J1536+0441: AN UNUSUAL DOUBLE-PEAKED EMITTER
THE QUASAR SDSS J1536+0441: AN UNUSUAL DOUBLE-PEAKED EMITTER
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DOI：
10.1088/2041-8205/709/1/l39
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
R. Chornock;J. Bloom;S. Cenko;A. Filippenko;J. Silverman;M. Hicks;K. Lawrence;A. Mendez;M. Rafelski;A. Wolfe
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文献类型：
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作者：
R. Chornock;J. Bloom;S. Cenko;A. Filippenko;J. Silverman;M. Hicks;K. Lawrence;A. Mendez;M. Rafelski;A. Wolfe
The quasar SDSS J153636.22+044127.0, exhibiting peculiar broad emission-line profiles with multiple components, was proposed as a candidate sub-parsec binary supermassive black hole system. More recently, imaging revealed two spatially distinct sources, leading some to suggest that the system was a quasar pair separated by ∼5 kpc. We present Palomar and Keck optical spectra of this system from which we identify a third velocity component to the emission lines. We argue that the system is more likely an unusual member of the class of active galactic nuclei known as “double-peaked emitters” than a sub-parsec black hole binary or quasar pair. We find no significant velocity evolution of the two main peaks over the course of 0.95 yr, with a 3σ upper limit on any secular change of 70 km s−1 yr−1. We also find that the three velocity components of the emission lines are spatially coincident to within 0.″015 along the slit, apparently ruling out the double-quasar hypothesis.
