# Spectroscopy of Hard X-ray Identi ed AGN

## Contact

Antonis Georgakakis
MPE, Germany
age@mpe.mpg.de

## Summary

Spectra of hard-x-ray selected AGN from XMM, selected to help constrain the dark matter halo masses of X-ray AGN as a function of redshift and luminosity

## Finding Targets

An object whose ANCILLARY_TARGET2 value includes one or more of the bitmasks in the following table was targeted for spectroscopy as part of this ancillary target program. See SDSS bitmasks to learn how to use these values to identify objects in this ancillary target program.

Program (bit name) Bit number Target Description Number of Fibers Number of Unique Primary Objects
XMMSDSS 11 Hard x-ray-selected AGN from XMM 25 25

## Description

This sample, identified with the XMMSDSS target class, was designed to spectroscopically confirm hard (2 – 10 keV) X-ray selected AGN identified in the serendipitous XMM survey of SDSS (Georgakakis & Nandra 2011). These objects tend to lie at relatively low redshift, z < 0.8. The completed program was designed to yield a large spectroscopic sample of luminous X-ray AGN at z < 0.8.

The cross-correlation measurement of those AGN with the SDSS and BOSS galaxy samples will constrain the dark matter halo masses of X-ray AGN as a function of redshift and luminosity.

## Target Selection

Objects identified by the XMMSDSS target class were selected with fX(2 – 10 keV) > 4 x 10-14 erg s-1 cm-2 and SDSS rmodel < 22. There was of order one target per square degree.

## REFERENCES

Georgakakis, A., & Nandra, K. 2011, MNRAS, 414, 992