A measurement of the Alcock-Paczynski effect using cosmic voids in the SDSS

Understand

We perform an Alcock-Paczynski test using stacked cosmic voids identified in the SDSS Data Release 7 main sample and Data Release 10 LOWZ and CMASS samples.

• We find ~1,500 voids out to redshift $0.6$ using a heavily modified and extended version of the watershed algorithm ZOBOV, which we call VIDE (Void IDentification and Examination).
• To assess the impact of peculiar velocities we use the mock void catalogs presented in Sutter et al.
• (2013).