The [NII] 205 $μ$m line emission from high-z SMGs and QSOs
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2025
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| author | Kolupuri, Saimurali Decarli, Roberto Neri, Roberto Cox, Pierre Ferkinhoff, Carl Bertoldi, Frank Weiss, Axel Venemans, Bram P. Riechers, Dominik A. Farina, Emanuele Paolo Walter, Fabian |
| author_facet | Kolupuri, Saimurali Decarli, Roberto Neri, Roberto Cox, Pierre Ferkinhoff, Carl Bertoldi, Frank Weiss, Axel Venemans, Bram P. Riechers, Dominik A. Farina, Emanuele Paolo Walter, Fabian |
| contents | We present [NII] 205 $μ$m fine structure line observations of three submillimeter galaxies (SMGs) and three quasar host galaxies at 4$\lesssim$z$\lesssim$6 using the Institut de radioastronomie millimétrique (IRAM) interferometer. The [NII] emission is detected in three sources, and we report detections of the underlying dust continuum emission in all sources. The observed [NII]-to-infrared luminosity ratio spans at least 0.5 dex for our sources. Comparing our estimates with sources detected in the [NII] 205 $μ$m at similar redshifts shows that the overall [NII]-to-IR luminosity ratio spans over a dex in magnitude from L$_{[NII]}$/L$_{IR}$ ~ 10$^{-4}$ - 10$^{-5}$ and follows the trend of the so-called [NII] fine structure line deficit observed in (ultra)-luminous infrared galaxies in the local Universe. The [CII]-to-[NII] luminosity ratio is >10 for most of our sources, indicating that the bulk of the [CII] 158 $μ$m line emission (f([CII]$^{PDR}$)>75%) arises from the neutral medium. From our analysis, we do not find significant differences in the [NII] 205 $μ$m emission and the respective ratios between SMGs and QSOs, suggesting a negligible contribution to the boosting of [NII] 205 $μ$m emission due to the active galactic nucleus (AGN) photoionization. Future investigations involving other fine structure lines and optical diagnostics will provide further insight into a suite of ionized medium properties and reveal the diversity between AGN and non-AGN environments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_08984 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The [NII] 205 $μ$m line emission from high-z SMGs and QSOs Kolupuri, Saimurali Decarli, Roberto Neri, Roberto Cox, Pierre Ferkinhoff, Carl Bertoldi, Frank Weiss, Axel Venemans, Bram P. Riechers, Dominik A. Farina, Emanuele Paolo Walter, Fabian Astrophysics of Galaxies We present [NII] 205 $μ$m fine structure line observations of three submillimeter galaxies (SMGs) and three quasar host galaxies at 4$\lesssim$z$\lesssim$6 using the Institut de radioastronomie millimétrique (IRAM) interferometer. The [NII] emission is detected in three sources, and we report detections of the underlying dust continuum emission in all sources. The observed [NII]-to-infrared luminosity ratio spans at least 0.5 dex for our sources. Comparing our estimates with sources detected in the [NII] 205 $μ$m at similar redshifts shows that the overall [NII]-to-IR luminosity ratio spans over a dex in magnitude from L$_{[NII]}$/L$_{IR}$ ~ 10$^{-4}$ - 10$^{-5}$ and follows the trend of the so-called [NII] fine structure line deficit observed in (ultra)-luminous infrared galaxies in the local Universe. The [CII]-to-[NII] luminosity ratio is >10 for most of our sources, indicating that the bulk of the [CII] 158 $μ$m line emission (f([CII]$^{PDR}$)>75%) arises from the neutral medium. From our analysis, we do not find significant differences in the [NII] 205 $μ$m emission and the respective ratios between SMGs and QSOs, suggesting a negligible contribution to the boosting of [NII] 205 $μ$m emission due to the active galactic nucleus (AGN) photoionization. Future investigations involving other fine structure lines and optical diagnostics will provide further insight into a suite of ionized medium properties and reveal the diversity between AGN and non-AGN environments. |
| title | The [NII] 205 $μ$m line emission from high-z SMGs and QSOs |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.08984 |