CO(1--0) imaging reveals 10-kiloparsec molecular gas reservoirs around star-forming galaxies at high redshift
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| author | Rybak, Matus Jansen, J. T. Castillo, M. Frias Hodge, J. A. van der Werf, P. P. Smail, I. Rivera, G. Calistro Chapman, S. Chen, C. -C. da Cunha, E. Dannerbauer, H. Jiménez-Andrade, E. F. Lagos, C. Liao, C. -L. Murphy, E. J. Scott, D. Swinbank, A. M. Walter, F. |
| author_facet | Rybak, Matus Jansen, J. T. Castillo, M. Frias Hodge, J. A. van der Werf, P. P. Smail, I. Rivera, G. Calistro Chapman, S. Chen, C. -C. da Cunha, E. Dannerbauer, H. Jiménez-Andrade, E. F. Lagos, C. Liao, C. -L. Murphy, E. J. Scott, D. Swinbank, A. M. Walter, F. |
| contents | Massive, intensely star-forming galaxies at high redshift require a supply of molecular gas from their gas reservoirs, replenished by infall from the surrounding circumgalactic medium, to sustain their immense star-formation rates. However, our knowledge of the extent and morphology of their cold-gas reservoirs is still in its infancy.
We present the results of stacking 80 hours of JVLA observations of CO(1--0) emission -- which traces the cold molecular gas -- in nineteen $z=2.0-4.5$ dusty, star-forming galaxies from the AS2VLA survey. The visibility-plane stack reveals extended emission with a half-light radius of $3.8\pm0.5$~kpc, 2--3$\times$ more extended than the dust-obscured star formation and $1.4\pm0.2\times$ more extended than the stellar emission revealed by JWST. Stacking the [CI](1--0) observations for ten galaxies from our parent sample yields a half-light radius $\leq$2.6~kpc, marginally smaller than CO(1--0). The CO(1--0) size is also comparable to the [CII] halos detected around high-redshift star-forming galaxies, suggesting these arise from molecular gas. Photo-dissociation region modelling indicates that the extended CO(1--0) emission arises from clumpy, dense clouds rather than smooth, diffuse gas.
Our results show that the bulk (up to 80\%) of molecular gas resides outside the star-forming region; with only a small part directly contributing to their current star formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_06474 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | CO(1--0) imaging reveals 10-kiloparsec molecular gas reservoirs around star-forming galaxies at high redshift Rybak, Matus Jansen, J. T. Castillo, M. Frias Hodge, J. A. van der Werf, P. P. Smail, I. Rivera, G. Calistro Chapman, S. Chen, C. -C. da Cunha, E. Dannerbauer, H. Jiménez-Andrade, E. F. Lagos, C. Liao, C. -L. Murphy, E. J. Scott, D. Swinbank, A. M. Walter, F. Astrophysics of Galaxies Massive, intensely star-forming galaxies at high redshift require a supply of molecular gas from their gas reservoirs, replenished by infall from the surrounding circumgalactic medium, to sustain their immense star-formation rates. However, our knowledge of the extent and morphology of their cold-gas reservoirs is still in its infancy. We present the results of stacking 80 hours of JVLA observations of CO(1--0) emission -- which traces the cold molecular gas -- in nineteen $z=2.0-4.5$ dusty, star-forming galaxies from the AS2VLA survey. The visibility-plane stack reveals extended emission with a half-light radius of $3.8\pm0.5$~kpc, 2--3$\times$ more extended than the dust-obscured star formation and $1.4\pm0.2\times$ more extended than the stellar emission revealed by JWST. Stacking the [CI](1--0) observations for ten galaxies from our parent sample yields a half-light radius $\leq$2.6~kpc, marginally smaller than CO(1--0). The CO(1--0) size is also comparable to the [CII] halos detected around high-redshift star-forming galaxies, suggesting these arise from molecular gas. Photo-dissociation region modelling indicates that the extended CO(1--0) emission arises from clumpy, dense clouds rather than smooth, diffuse gas. Our results show that the bulk (up to 80\%) of molecular gas resides outside the star-forming region; with only a small part directly contributing to their current star formation. |
| title | CO(1--0) imaging reveals 10-kiloparsec molecular gas reservoirs around star-forming galaxies at high redshift |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.06474 |