Abstract Details
| Name: Vaidehi S. Paliya Affiliation: Indian Institute of Astrophysics Conference ID: ASI2015_716 Title : Blazars in the Early Universe Authors and Co-Authors : C. S. Stalin, Indian Institute of Astrophysics Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : Blazars are radio-loud active galactic nuclei with powerful relativistic jets oriented at small angles to the observer. As as result, the radiation from blazars is strongly Doppler boosted and they are therefore expected to be visible to very high redshifts (z > 4). Such high redshift blazars are found to be hosted by more than a billion solar mass black holes (BH). Searches for high redshift blazars is extremely important as every new detection of a high redshift blazar implies the existence of hundreds of such high BH mass systems with jet pointing elsewhere. This has major implications on BH formation models. We have carried out a systematic search for high redshift radio-loud quasars (RLQs) from SDSS-DR10. The sample thus obtained is carefully analysed using all available archival observations from low-frequency radio waves to high-frequency X-rays. In the analysis, we have concentrated on two properties of the RLQs, namely high radio-loudness and high X-ray flux with a hard spectrum. The RLQs found with large radio-loudness and hard X-ray spectrum were then subjected to multi-band SED modeling to identify candidate high redshift blazars. This effort has led to the identification of about half-a-dozen potential high redshift blazar candidates. The details of the findings will be presented. |