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Spatially resolved Lyman-α emission around radio bright quasars

Abstract : We use Southern African Large Telescope (SALT) to perform long-slit spectroscopic observations of 23 newly discovered radio-loud quasars (RLQs) at 2.7 < z < 3.3. The sample consists of powerful AGN brighter than 200 mJy at 1.4 GHz and is selected on the basis of mid-infrared colors i.e., unbiased to the presence of dust. We report 7 confirmed and 5 tentative detections of diffuse Lyα emission in the sample. We present the properties of diffuse Lyα emission and discuss in detail its relationship to different quasar properties. We find strong dependence of Lyα halo detection rate on the extent of radio source, spectral luminosity of RLQ at 420 MHz (L 420MHz), presence of associated C IV absorption and nuclear He II emission line equivalent width. As seen in previous surveys, the FWHM of diffuse Lyα emission in the case of confirmed detections are much higher (i.e.>1000 km/s in all, except one). Using the samples of high-z radio-loud quasars and galaxies from literature, we confirm the correlation between the Lyα halo luminosity and its size with L 420MHz. The same quantities are found to be correlating weakly with the projected linear size of the radio emission. Our sample is the second largest sample of RLQs being studied for the presence of diffuse Lyα emission and fills in a redshift gap between previous such studies. Integral Field Spectroscopy is required to fully understand the relationship between the large scale radio emission and the overall distribution, kinematics and over density of Lyα emission in the field of these RLQs.
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Submitted on : Friday, January 14, 2022 - 11:59:57 AM
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Gitika Shukla, Raghunathan Srianand, Neeraj Gupta, Patrick Petitjean, Andrew Baker, et al.. Spatially resolved Lyman-α emission around radio bright quasars. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2021, 510 (1), pp.786-806. ⟨10.1093/mnras/stab3467⟩. ⟨hal-03526143⟩

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