The LBT z~6 QSOs Project

Mapping the primordial environment of QSOs at z~6 with LBT

In the current model of structure formation, high redshift QSOs are supposed to be hosted in the most massive dark matter halos and they should be therefore tracer of overdensities of star-forming galaxies, but the observational evidence is still not clear.
In 2012 we started an optical imaging campaign to search for galaxy overdensities around four luminous QSOs at z~6 using wide area, deep images in the r-,i- and z-bands, obtained with the Large Binocular Camera (LBC) on the Large Binocular Telescope (LBT).

The investigated QSOs are:
QSO (SDSS id) RA(J2000) DEC(J2000) z MBH [109M] zAB
J1030+0524 10:30:27.1 +05:24:55 6.28 3.2 20.0
J1048+4637 10:48:45.5 +46:37:18 6.20 3.9 19.9
J1148+5251 11:48:16.1 +52:51:50 6.41 4.9 20.1
J1411+1217 14:11:11.3 +12:17:37 5.95 1.2 19.6

For the J1030 field we obtained also Y- and J-band imaging with the near infrared camera (WIRCam) at the Canada-France-Hawaii Telescope (CFHT)
The large field of view of the LBC (25'x25') allowed us to search for z~6 LBG candidates on scales as large as 4 projected Mpc from the QSOs. When combining the four fields, we found significant evidence for large-scale overdensities of LBG candidates around early quasars. Results are presented in Morselli et al. (2014, A&A 568, A1).

The Data:

This web page provides, for each of the four fields, a tri-color image of the full FoV, the FITS image of the r, i, z mosaics, the z-band selected photometric catalog with associated r- and i-band magnitudes, and cutouts of the i-dropouts selected as candidate high-z galaxies in the field. Each FITS image is about 200 MB in size, and the catalogs are 4-5 MB. For the J1030 field we also provide the FITS image of the Y, J mosaic, along with the corresponding near-infrared detected catalogs. This is the README file providing additional information about the photometric catalogs.