ALMA 50-parsec resolution imaging of jet-ISM interaction in the lensed quasar MGJ0414+0534

Abstract

We report our high-resolution (0.03 arcsec to 0.07 arcsec) ALMA imaging of the quadruply lensed radio-loud quasar MG\,J0414+0534 at redshift $z=2.639$ in the continuum and the broad CO(11-10) line at $\sim 340$GHz. With the help of strong lensing magnification and ALMA's high-resolution, we succeeded in resolving the jet/dust and CO gas in the quasar host galaxy both extending up to $\sim 1$kpc, with a resolution of $\sim 50$pc for the first time. Both the continuum emission and the CO(11-10) line have a similar bimodal structure aligned with the quasar jets ($\sim 200$pc) observed by Very Long Baseline Interferometry (VLBI) at $5$GHz and $8.4$GHz. The CO gas in the vicinity of both the eastern and western jet components at the location of $\sim 80$pc from the quasar core are moving at high velocities up to $\pm 600$$\text{km}{\text{s}}^{-1}$ relative to the core. The observed features show clear evidence of strong interaction between the jets and interstellar medium (ISM). High temperature and high density environments in the ISM of the quasar host galaxy, as suggested from CO line ratios, also support this result. The small scale of the jets, the jet-ISM interaction, and the continuum spectral energy distribution of this source indicate that we are watching the infancy stage of quasar radio activity.

arXiv comment7 pages, 4 figures, typos corrected

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