Physical association and periodicity in quasar families with SDSS and 2MRS


We have used the Sloan Digital Sky Survey (SDSS) data release 7 (DR7) and the 2MASS (Two Micron All Sky Survey) Redshift Survey (2MRS) \(K_{s} \le11.75~\mbox{mag}\) data release to test for physical association of candidate companion quasars with putative parent galaxies by virtue of Karlsson periodicity in quasar redshifts. We conducted this analysis using the quasar family detection algorithm described in Fulton and Arp (Astrophys. J. 754:134, 2012) and used therein to analyze the 2dF Galaxy Redshift Survey (2dFGRS) and the 2dF Quasar Redshift Survey (2QZ). The SDSS and 2MRS data sets confirm the 2dF results and allow us to examine additional object behaviors also at high significance.

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  1. 1. (\(15.3547 \le g \le 27.2335\) after cull, but \(g\) not used in tests).

  2. 2. (\(3.898 \le K_{s} \le11.75\) after cull, but \(K_{s}\) not used).


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Correspondence to C. C. Fulton.

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Halton Arp passed away in 2013 December. We dedicate this article to him and to his early decade of work on galaxies and subsequent five decades of work on the nature of galaxy and quasar redshifts.

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Fulton, C.C., Arp, H.C. & Hartnett, J.G. Physical association and periodicity in quasar families with SDSS and 2MRS. Astrophys Space Sci 363, 134 (2018).

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  • Galaxies: active
  • Galaxies: distances and redshifts
  • Quasars: general
  • Redshifts