A sample of Swift/SDSS faint blazars and blazar candidates
Bernardo Fraga ; Paolo Giommi ; Sara Turriziani
Nov - 2017
DOI: 10.1142/9789813226609_0391

Event Title : The Fourteenth Marcel Grossmann Meeting
Published in: Proceedings of the MG14 Meeting on General Relativity
Publisher: World Scientific
type: Conference Proceedings

We aim here to provide a complete sample of faint (fr ≳ 1 mJy, fx ≳ 10−15 erg cm−2 s−1) blazars and blazar candidates serendipitously discovered in deep Swift images centered on Gamma-ray bursts (GRBs). By stacking all available images, we obtain exposures ranging from 104 to more than a million seconds. Since GRBs are thought to explode randomly across the sky, this set of deep fields can be considered as an unbiased survey of approximately 12 square degrees of extragalactic sky, with sensitivities reaching a few 10−15 erg cm−2 s−1 in the 0.5-2 keV band. We then derive the x-ray Log N Log S and show that, considering that our sample may be contaminated by sources other than blazars, we are in agreement with previous estimations based on data and simulations.

keywords : Active galaxies; BL Lacertae; catalogs; non-thermal radiation