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25 April 2024 |
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A Large Systematic Search for Close Supermassive Binary and Rapidly Recoiling Black Holes - II. Continued Spectroscopic Monitoring and Optical Flux Variability | | Jessie C. Runnoe
; Michael Eracleous
; Gavin Mathes
; Alison Pennell
; Todd Boroson
; Steinn Sigurdsson
; Tamara Bogdanovic
; Jules P. Halpern
; Jia Liu
; | | Date: |
9 Sep 2015 | | Abstract: | We present new spectroscopic observations that are part of our continuing
monitoring campaign of 88 quasars at z<0.7 whose broad H-beta lines are offset
from their systemic redshifts by a few thousand km/s. These quasars have been
considered candidates for hosting supermassive black hole binaries (SBHBs) by
analogy with single-lined spectroscopic binary stars. We present the data and
describe our improved analysis techniques, which include an extensive
evaluation of uncertainties. We also present a variety of measurements from the
spectra that are of general interest and will be useful in later stages of our
analysis. Additionally, we take this opportunity to study the variability of
the optical continuum and integrated flux of the broad H-beta line. We compare
the variability properties of the SBHB candidates to those of a sample of
typical quasars with similar redshifts and luminosities observed multiple times
during the Sloan Digital Sky Survey. We find that the variability properties of
the two samples are similar (variability amplitudes of 10-30% on time scales of
approximately 1-7 years) and that their structure functions can be described by
a common model with parameters characteristic of typical quasars. These results
suggest that the broad-line regions of SBHB candidates have a similar extent as
those of typical quasars. We discuss the implications of this result for the
SBHB scenario and ensuing constraints on the orbital parameters. | | Source: | arXiv, 1509.2575 | | Services: | Forum | Review | PDF | Favorites | |
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