Abstract Details
| Name: Mukul Mhaskey Affiliation: University of Pune Conference ID: ASI2018_879 Title : GMRT quasi-simultaneous simultaneous observations of 25 Inverted Spectrum Extragalactic Radio Sources Authors and Co-Authors : Gopal-Krishna (CEBS, Mumbai), Pratik Dabhade(IUCAA, Pune), Surajit Paul (Department of Physics, University of Pune) Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : Even for a perfectly homogeneous radio source, inverted spectrum at low frequencies (~100MHz) with a slope α greater than +2.5 cannot arise from self-absorption in synchrotron plasma with the standard (power-law) energy distribution of relativistic electrons. Therefore, any such extreme spectra, if found, would require invoking either a non-standard electron energy distribution (e.g., Maxwellian) or,alternatively, thermal free-free absorption in external medium. As a first step towards examining if such sources exist, we have started a systematic search for extragalactic radio sources having integrated spectrum with α > +2. We present here new GMRT quasi-simultaneous observations of ~25 steeply inverted spectrum sources to define their continuum spectra at sub-GHz frequencies (0.15 to 1.4 GHz). |