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In a paper titled

Arp, H. (1984). Distribution of quasars on the sky. Journal of Astrophysics and Astronomy, 5(1):31-41.

at Journal of Astrophysics and Astronomy, Halton Arp wrote that there is a notable clustering of quasars at $21^h<RA<3^h$, and a marked lack of quasars at $9^h<RA<15^h$, but I haven't been able to find other references to the same distribution. The paper was published in 1984, so has anyone else published a similar result, or has this observation been

  • refuted, or

  • explained?

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