VizieR Online Data Catalog: Properties and X-rays of RLQs and RQQs quasars (Zhu+, 2021)

First, we construct a sample of RLQs based on Zhu et al. (2020MNRAS.496..245Z, Cat. J/MNRAS/496/245). Archival Chandra, XMM-Newton, and ROSAT observations are used to calculate the X-ray luminosities of these optically selected quasars with the help of SDSS. Only a small fraction of the RLQ sample is targeted by these X-ray observations, therefore this sample is not significantly biased by the target selection of these X-ray observations (e.g. Gibson & Brandt 2012ApJ...746...54G, Cat. J/ApJ/746/54). This RLQ sample also has large fractions of X-ray detections and spectroscopic confirmations by SDSS as tabulated in table1.dat.

Secondly, in order to investigate the X-ray temporal properties of RLQs using multiple-epoch observations, we match the RLQ list with the observation catalogues of Chandra and XMM-Newton. The matching results is used for X-ray spectral studies and to investigate the X-ray variability properties of RLQs. We apply data reduction processus on Chandra and XMM-Newton science images (see section 2.2) giving us Chandra/ACIS and XMM-Newton/EPIC spectra on which we can compute X-ray energy fluxes and detection flux limit (see section 2.3) and thus performing X-ray spectral fitting to get access to the power spectrum spectral indices (see section 3). The X-ray properties results are summarized in the table2.dat for RLQs quasars.

Hereafter, we construct same tables for RQQs in order to compare them to our previous RLQs samples. We therefore extended the analysis of Timlin et al. (2020MNRAS.498.4033T, Cat. J/MNRAS/498/4033) with the help of the SDSS DR14Q (Paris et al. 2018A&A...613A..51P, Cat. VII/286) following the selection method seen before, the tablea1.dat contains the properties of the 606 RQQs optically selected. Note that all observations data are consistently analysed in the same way as described above (see section 2.2, 2.3 and 3). In total, we obtain 2341 serendipitous Chandra observations of the RQQs listed in the tablea2.dat.

(4 data files).