Resolved ALMA [CII] 158 micron Observations at Cosmic Noon: ISM Structure and Dynamics of Starbursting QSO SDSSJ1000
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| Format: | Preprint |
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2025
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| _version_ | 1866912380604121088 |
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| author | Rooney, Christopher Peng, Bo Vishwas, Amit Stacey, Gordon Nikola, Thomas Lamarche, Cody Ball, Catie Ferkinhoff, Carl Brisbin, Drew Hailey-Dunsheath, Steven |
| author_facet | Rooney, Christopher Peng, Bo Vishwas, Amit Stacey, Gordon Nikola, Thomas Lamarche, Cody Ball, Catie Ferkinhoff, Carl Brisbin, Drew Hailey-Dunsheath, Steven |
| contents | We present spatially resolved Alma Band-9 observations of the [CII] 158 $μ$m fine structure line from an optically selected quasar, SDSS J100038.01+020822.4 (J1000), at z=1.8275. By utilizing [OI] 63 $μ$m line observations from Herschel/PACS and constructing a detailed dust SED using Herschel and Spitzer archival imaging data, we show that the [CII] line emission is well explained by a photodissociation region (PDR) model, in which the emission arises from the surfaces of molecular clouds exposed to far-UV radiation fields $\sim 5\cdot10^3$ times the local interstellar radiation field (G$_0$). We find a factor of 30 variation in spatially resolved [CII]/Far-IR continuum across the source which is explained by the reduced fraction of cooling via [CII] line emission at such high far-UV field strengths. By matching derived PDR parameters to the observed far-IR line and continuum intensities we derive cloud size-scales and find that typical cloud radii in J1000 are $\sim$3.5 pc perhaps indicating an ISM that is highly fractured due to intense star formation activity. We model the galaxy dynamically and find that the [CII] emission is contained within a compact, dynamically cold disk with v/$σ$=6.2, consistent with cosmological simulations. We also report the discovery of a companion galaxy to j1000 confirmed by the detection of [CII] and use recently obtained JWST/NirCAM imaging of the system to argue for J1000 being an interacting system. With total stellar mass $\sim 1.5 \times 10^{10}$ M$_\odot$ and main-component dynamical mass $\gtrsim 10^{11}$ M$_\odot$, the J1000 system is a progenitor to the most massive galaxies seen in the local Universe. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_07325 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Resolved ALMA [CII] 158 micron Observations at Cosmic Noon: ISM Structure and Dynamics of Starbursting QSO SDSSJ1000 Rooney, Christopher Peng, Bo Vishwas, Amit Stacey, Gordon Nikola, Thomas Lamarche, Cody Ball, Catie Ferkinhoff, Carl Brisbin, Drew Hailey-Dunsheath, Steven Astrophysics of Galaxies We present spatially resolved Alma Band-9 observations of the [CII] 158 $μ$m fine structure line from an optically selected quasar, SDSS J100038.01+020822.4 (J1000), at z=1.8275. By utilizing [OI] 63 $μ$m line observations from Herschel/PACS and constructing a detailed dust SED using Herschel and Spitzer archival imaging data, we show that the [CII] line emission is well explained by a photodissociation region (PDR) model, in which the emission arises from the surfaces of molecular clouds exposed to far-UV radiation fields $\sim 5\cdot10^3$ times the local interstellar radiation field (G$_0$). We find a factor of 30 variation in spatially resolved [CII]/Far-IR continuum across the source which is explained by the reduced fraction of cooling via [CII] line emission at such high far-UV field strengths. By matching derived PDR parameters to the observed far-IR line and continuum intensities we derive cloud size-scales and find that typical cloud radii in J1000 are $\sim$3.5 pc perhaps indicating an ISM that is highly fractured due to intense star formation activity. We model the galaxy dynamically and find that the [CII] emission is contained within a compact, dynamically cold disk with v/$σ$=6.2, consistent with cosmological simulations. We also report the discovery of a companion galaxy to j1000 confirmed by the detection of [CII] and use recently obtained JWST/NirCAM imaging of the system to argue for J1000 being an interacting system. With total stellar mass $\sim 1.5 \times 10^{10}$ M$_\odot$ and main-component dynamical mass $\gtrsim 10^{11}$ M$_\odot$, the J1000 system is a progenitor to the most massive galaxies seen in the local Universe. |
| title | Resolved ALMA [CII] 158 micron Observations at Cosmic Noon: ISM Structure and Dynamics of Starbursting QSO SDSSJ1000 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.07325 |