Active Galactic Nuclei (AGN) studies have mainly been limited to the local Universe, but more sensitive observations in recent years allow us to unveil new population of AGN at distant Universe. Using our
deep radio continuum surveys combined with auxiliary optical, IR surveys we discover a new population of AGN called--Infrared-Faint Radio Sources
(IFRSs). These AGN are at the redshift of (z) ~ 2 – 4 and exhibit diverse properties in terms of their radio luminosities, sizes and spectra, indicating them to be radio-loud AGN at different evolutionary phases. The
optical-to-MIR colors and their non-detection in the X-ray band suggest them to be AGN hosted in dusty-obscured-galaxies. The discovery of IFRSs
has important implication on the models of galaxy evolution and in explaining the missing unresolved AGN population predicted by the Cosmic X-ray Background model. In this talk I shall also discuss the role of
deeper surveys from telescopes operating at radio, optical, IR and X-ray wavelengths.
Dr. Veeresh Singh is faculty in Astronomy and Astrophysics Division of Physical Research Laboratory Ahmedabad. His research interest involves: (i) Multiwavelength study of Active Galactic Nuclei (AGN)
(ii) Formation and evolution of AGN and their host galaxies (iii) Population of AGN at high-redshifts and their environments and (iv) Deep radio and ancillary surveys of extragalactic fields.