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of 38
pro vyhledávání: '"Mhaskey, Mukul"'
We report our ongoing search for extremely inverted spectrum compact radio galaxies, for which the defining feature in the radio spectrum is not the spectral peak, but instead the slope of the spectrum (alpha) in the high-opacity (i.e., lower frequen
Externí odkaz:
http://arxiv.org/abs/2110.00355
Publikováno v:
A&A 643, A174 (2020)
We report the detection of HI 21-cm absorption in a member of the rare and recently discovered class of compact radio sources, 'Extremely Inverted Spectrum Extragalactic Radio Sources (EISERS)'. EISERS conceivably form a special sub-class of the inve
Externí odkaz:
http://arxiv.org/abs/2009.12592
Autor:
Mhaskey, Mukul, Gopal-Krishna, Paul, Surajit, Dabhade, Pratik, Salunkhe, Sameer, Bhagat, Shubham, Bendre, Abhijit
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 2019, Volume 489, Issue 3: pp. 3506
We present an extension of our search for Extremely Inverted Spectrum Extragalactic Radio Sources (EISERS) to the northern celestial hemisphere. With an inverted radio spectrum of slope $\alpha$ > +2.5, these rare sources would either require a non-s
Externí odkaz:
http://arxiv.org/abs/1908.08883
Autor:
Mhaskey, Mukul, Gopal-Krishna, Dabhade, Pratik, Paul, Surajit, Salunkhe, Sameer, Sirothia, S. K.
We report quasi-simultaneous GMRT observations of seven extragalactic radio sources at 150, 325, 610 and 1400 MHz, in an attempt to accurately define their radio continuum spectra, particularly at frequencies below the observed spectral turnover. We
Externí odkaz:
http://arxiv.org/abs/1901.11217
We present here an extension of our search for EISERS (Extremely Inverted Spectrum Extragalactic Radio Sources) to the northern hemisphere. With an inverted radio spectrum of slope $\alpha$ $>$ + 2.5, these rare sources would either require a non-sta
Externí odkaz:
http://arxiv.org/abs/1807.05441
Autor:
Gopal-Krishna, Sirothia, S. K., Mhaskey, Mukul, Ranadive, Pritesh, Wiita, Paul J., Goyal, A., Kantharia, N. G., Ishwara-Chandra, C. H.
We present the first results of a systematic search for the rare extragalactic radio sources showing an inverted (integrated) spectrum, with spectral index $\alpha \ge +2.0$, a previously unexplored spectral domain. The search is expected to yield st
Externí odkaz:
http://arxiv.org/abs/1407.4255
It is important to quantify the underestimation of rms photometric errors returned by the commonly used $\emph APPHOT$ algorithm in the $\emph IRAF$ software, in the context of differential photometry of point-like AGN, because of the crucial role it
Externí odkaz:
http://arxiv.org/abs/1306.5437
Autor:
Gopal-Krishna, Mhaskey, Mukul, Wiita, Paul J., Sirothia, S. K., Kantharia, N. G., Ishwara-Chandra, C. H.
We discuss the nature of the multi-component radio continuum and HI emission associated with the nearby galaxy group comprised of two dominant ellipticals, NGC 5898 and NGC 5903, and a dwarf lenticular ESO514-G003. Striking new details of radio emiss
Externí odkaz:
http://arxiv.org/abs/1203.3424
We point out that the remarkable linearity of the ultra-steep radio spectra of high redshift radio galaxies reflects a previously reported general trend for powerful radio galaxies, according to which the spectral curvature is lesser for sources havi
Externí odkaz:
http://arxiv.org/abs/1110.3884
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