The rich galactic environment of a H$_2$-absorption selected quasar
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909285937577984 |
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| author | Urbina, F. Noterdaeme, P. Berg, T. A. M. Balashev, S. López, S. Bian, F. |
| author_facet | Urbina, F. Noterdaeme, P. Berg, T. A. M. Balashev, S. López, S. Bian, F. |
| contents | We present the first VLT/MUSE observations of a quasar featuring a proximate molecular absorption system, SDSS J125917.31+030922.5. The proximate damped Ly$α$ absorption acts as a natural coronagraph, removing the quasar emission over $\sim$40 Å in wavelength, and allows us to detect extended Ly$α$ emission without the necessity of subtracting the quasar emission. This natural coronagraph permits the investigation of the quasar environment down to its inner regions ($r < 20$ kpc), where galaxy interactions or feedback processes should have the most noticeable effects. Our observations reveal a dense environment, with a highly asymmetric Ly$α$ emission within $2"$ ($\sim 15$ kpc), possibly shaped by a companion galaxy, and a southern extension of the nebulae at about 50~kpc, with rotation-like kinematic signature. The width of the Ly$α$ emission is broadest closer to the quasar, indicating perturbed kinematics as expected if interactions and significant gas flows are present. The foreground absorbing system itself is redshifted by $\approx $400 km/s relative to the background quasar, and therefore is likely arising from gas moving towards the quasar. Finally two additional Ly$α$ emitters are detected with $>10\,σ$ significance at 96 and 223 kpc from the quasar, making this field overdense relative to other similar observations of quasars at $z\sim 3$. Our results support the hypothesis that quasars with proximate neutral/molecular absorption trace rich environments where galaxy interactions are at play and motivates further studies of H$_2$-selected quasars to shed light on feeding and feedback processes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_16818 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The rich galactic environment of a H$_2$-absorption selected quasar Urbina, F. Noterdaeme, P. Berg, T. A. M. Balashev, S. López, S. Bian, F. Astrophysics of Galaxies We present the first VLT/MUSE observations of a quasar featuring a proximate molecular absorption system, SDSS J125917.31+030922.5. The proximate damped Ly$α$ absorption acts as a natural coronagraph, removing the quasar emission over $\sim$40 Å in wavelength, and allows us to detect extended Ly$α$ emission without the necessity of subtracting the quasar emission. This natural coronagraph permits the investigation of the quasar environment down to its inner regions ($r < 20$ kpc), where galaxy interactions or feedback processes should have the most noticeable effects. Our observations reveal a dense environment, with a highly asymmetric Ly$α$ emission within $2"$ ($\sim 15$ kpc), possibly shaped by a companion galaxy, and a southern extension of the nebulae at about 50~kpc, with rotation-like kinematic signature. The width of the Ly$α$ emission is broadest closer to the quasar, indicating perturbed kinematics as expected if interactions and significant gas flows are present. The foreground absorbing system itself is redshifted by $\approx $400 km/s relative to the background quasar, and therefore is likely arising from gas moving towards the quasar. Finally two additional Ly$α$ emitters are detected with $>10\,σ$ significance at 96 and 223 kpc from the quasar, making this field overdense relative to other similar observations of quasars at $z\sim 3$. Our results support the hypothesis that quasars with proximate neutral/molecular absorption trace rich environments where galaxy interactions are at play and motivates further studies of H$_2$-selected quasars to shed light on feeding and feedback processes. |
| title | The rich galactic environment of a H$_2$-absorption selected quasar |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2407.16818 |