Physical constraints on the extended interstellar medium of the z=6.42 quasar J1148+5251: [CII] 158um, [NII] 205um and [OI] 146um observations

Abstract

We report new Northern Extended Millimeter Array (NOEMA) observations of the [CII], [NII] and [OI] atomic fine structure lines and dust continuum emission of J1148+5251, a z=6.42 quasar, that probe the physical properties of its interstellar medium (ISM). The radially-averaged [CII] and dust continuum emission have similar extensions (up to $\theta =2.51_{-0.25}^{+0.46}\mathrm{arcsec}$, corresponding to $r=9.8_{-2.1}^{+3.3}\mathrm{kpc}$ accounting for beam-convolution), confirming that J1148+5251 is the quasar with the largest [CII]-emitting has reservoir known at these epochs.Moreover, if the [CII] emission is examined only along its NE-SW axis, a significant excess ($>5.8\sigma$) of [CII] emission (with respect to the dust) is detected. The new wide--bandwidth observations enable us to accurately constrain the continuum emission, and do not statistically require the presence of broad [CII] line wings that were reported in previous studies. We also report the first detection of the [OI] and (tentatively) [NII] emission lines in J1148+5251. Using Fine Structure Lines (FSL) ratios of the [CII], [NII], [OI] and previously measured [CI] emission lines, we show that J1148+5251 has similar ISM conditions compared to lower--redshift (ultra)-luminous infrared galaxies. CLOUDY modelling of the FSL ratios exclude X--ray dominated regions (XDR) and favours photodissociation regions (PDR) as the origin of the FSL emission. We find that a high radiation field ($10^{3.5-4.5}{G}_0$), high gas density ($n\simeq 10^{3.5-4.5}{\mathrm{cm}}^{-3}$) and HI column density of $10^{23}\mathrm{c}{\mathrm{m}}^{-2}$ reproduce the observed FSL ratios well.

arXiv commentAccepted for publication in The Astrophysical Journal

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