Optically Selected Radio-Intermediate and Loud Quasars X-ray Emission Catalog
Updated 2mo ago
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Description
NASA's HEASARC table contains the primary sample from a 2012 study investigating X-ray properties of quasars. The catalog includes 654 optically selected radio-intermediate and radio-loud quasars with observations from SDSS, FIRST, and archival X-ray data from Chandra, XMM-Newton, and ROSAT. It provides broad coverage of the luminosity-redshift plane, with 22% of objects at high redshifts (z=2-5) and an 84% X-ray detection rate.
Use Cases
Modeling X-ray luminosity as a function of optical/UV and radio luminosity based on the parametrization described.
Analyzing the 'excess' X-ray brightness of radio-loud quasars relative to radio-quiet quasars as a function of radio loudness.
Studying the distribution of quasars across the luminosity-redshift plane, including high-redshift objects.
Comparing X-ray detection rates and properties across different observatories (Chandra, XMM-Newton, ROSAT).
Strengths
High X-ray detection rate of 84% for the primary sample of 654 quasars.
Broad coverage of the luminosity-redshift plane, including 22% of objects at high redshifts (z=2-5).
Combines data from multiple modern optical (SDSS), radio (FIRST), and X-ray (Chandra, XMM-Newton, ROSAT) surveys.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count is unknown, which may limit suitability assessment.
Data is based on a 2012 study; freshness should be verified for current research.
Provenance
Source
National Aeronautics and Space Administration (NASA), HEASARC
Collection Method
Combined large optical (SDSS) and radio (FIRST) surveys with archival X-ray data from Chandra, XMM-Newton, and ROSAT.
Time Range
Based on archival data; specific observation dates are not provided.
Freshness
Last updated 2026-03-13 19:04:48.611112; freshness should be verified.
Geography
Astronomical observations; not geographically bound.
License is listed as 'other-license-specified'; specific terms must be checked. File formats are BIN and HTML.