Probes of large-scale structure in the Corona Borealis region

Abstract

We discuss a redshift survey of the Corona Borealis region. Our unfilled deep survey consists of five probes complete to m R = 15.7. These cover 3.4 square degrees distributed over a ~ 16.4 square degree region. We include redshifts, magnitudes, and positions for the 83 galaxies in this survey. A complementary filled survey covers 39.2 square degrees and is complete to m B{0) = 15.5. There are 37 galaxies in this survey, which is part of the CfA redshift extension (de Lapparent, Geller, and Huchra 1986). The combined survey provides further support for the "bubble-like ,, geometry revealed by the shallower CfA survey. The redshift distribution for the new survey is remarkably similar to the distribution in the neighboring Bootes region. We detect a void near Bootes with a radius £ 13A _1 Mpc {H 0 = 100Ä kms _1 Mpc _1). This survey also indicates that the structure of voids and surfaces in the galaxy distribution is insensitive to luminosity for M B{0) S-17.4.