JWST Observations of Starbursts: Cold Clouds and Plumes Launching in the M82 Outflow
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2024
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| author | Fisher, Deanne B. Bolatto, Alberto D. Chisholm, John Fielding, Drummond Levy, Rebecca C. Tarantino, Elizabeth Boyer, Martha L. Cronin, Serena A. Lopez, Laura A. Smith, J. D. Berg, Danielle A. Lopez, Sebastian Veilleux, Sylvain van der Werf, Paul P. Böker, Torsten Boogaard, Leindert A. Lenkić, Laura Glover, Simon C. O. Villanueva, Vicente Mayya, Divakara Lai, Thomas S. -Y. Dale, Daniel A. Emig, Kimberly L. Walter, Fabian Relaño, Monica De Looze, Ilse Mills, Elisabeth A. C. Leroy, Adam K. Meier, David S. Herrera-Camus, Rodrigo Klessen, Ralf S. |
| author_facet | Fisher, Deanne B. Bolatto, Alberto D. Chisholm, John Fielding, Drummond Levy, Rebecca C. Tarantino, Elizabeth Boyer, Martha L. Cronin, Serena A. Lopez, Laura A. Smith, J. D. Berg, Danielle A. Lopez, Sebastian Veilleux, Sylvain van der Werf, Paul P. Böker, Torsten Boogaard, Leindert A. Lenkić, Laura Glover, Simon C. O. Villanueva, Vicente Mayya, Divakara Lai, Thomas S. -Y. Dale, Daniel A. Emig, Kimberly L. Walter, Fabian Relaño, Monica De Looze, Ilse Mills, Elisabeth A. C. Leroy, Adam K. Meier, David S. Herrera-Camus, Rodrigo Klessen, Ralf S. |
| contents | In this paper we study the filamentary substructure of 3.3 $μ$m PAH emission from JWST/NIRCam observations in the base of the M82 star-burst driven wind. We identify plume-like substructure within the PAH emission with widths of $\sim$50 pc. Several of the plumes extend to the edge of the field-of-view, and thus are at least 200-300 pc in length. In this region of the outflow, the vast majority ($\sim$70\%) of PAH emission is associated with the plumes. We show that those structures contain smaller scale "clouds" with widths that are $\sim$5-15 pc, and they are morphologically similar to the results of "cloud-crushing" simulations. We estimate the cloud-crushing time-scales of $\sim$0.5-3 Myr, depending on assumptions. We show this time scale is consistent with a picture in which these observed PAH clouds survived break-out from the disk rather than being destroyed by the hot wind. The PAH emission in both the midplane and the outflow is shown to tightly correlate with that of Pa$α$ emission (from HST/NICMOS data), at the scale of both plumes and clouds, though the ratio of PAH-to-Pa$α$ increases at further distances from the midplane. Finally, we show that the outflow PAH emission is suppressed in regions of the M82 wind that are bright in X-ray emission. Overall, our results are broadly consistent with a picture in which cold gas in galactic outflows is launched via hierarchically structured plumes, and those small scale clouds are more likely to survive the wind environment when collected into the larger plume structure. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_03686 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | JWST Observations of Starbursts: Cold Clouds and Plumes Launching in the M82 Outflow Fisher, Deanne B. Bolatto, Alberto D. Chisholm, John Fielding, Drummond Levy, Rebecca C. Tarantino, Elizabeth Boyer, Martha L. Cronin, Serena A. Lopez, Laura A. Smith, J. D. Berg, Danielle A. Lopez, Sebastian Veilleux, Sylvain van der Werf, Paul P. Böker, Torsten Boogaard, Leindert A. Lenkić, Laura Glover, Simon C. O. Villanueva, Vicente Mayya, Divakara Lai, Thomas S. -Y. Dale, Daniel A. Emig, Kimberly L. Walter, Fabian Relaño, Monica De Looze, Ilse Mills, Elisabeth A. C. Leroy, Adam K. Meier, David S. Herrera-Camus, Rodrigo Klessen, Ralf S. Astrophysics of Galaxies In this paper we study the filamentary substructure of 3.3 $μ$m PAH emission from JWST/NIRCam observations in the base of the M82 star-burst driven wind. We identify plume-like substructure within the PAH emission with widths of $\sim$50 pc. Several of the plumes extend to the edge of the field-of-view, and thus are at least 200-300 pc in length. In this region of the outflow, the vast majority ($\sim$70\%) of PAH emission is associated with the plumes. We show that those structures contain smaller scale "clouds" with widths that are $\sim$5-15 pc, and they are morphologically similar to the results of "cloud-crushing" simulations. We estimate the cloud-crushing time-scales of $\sim$0.5-3 Myr, depending on assumptions. We show this time scale is consistent with a picture in which these observed PAH clouds survived break-out from the disk rather than being destroyed by the hot wind. The PAH emission in both the midplane and the outflow is shown to tightly correlate with that of Pa$α$ emission (from HST/NICMOS data), at the scale of both plumes and clouds, though the ratio of PAH-to-Pa$α$ increases at further distances from the midplane. Finally, we show that the outflow PAH emission is suppressed in regions of the M82 wind that are bright in X-ray emission. Overall, our results are broadly consistent with a picture in which cold gas in galactic outflows is launched via hierarchically structured plumes, and those small scale clouds are more likely to survive the wind environment when collected into the larger plume structure. |
| title | JWST Observations of Starbursts: Cold Clouds and Plumes Launching in the M82 Outflow |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.03686 |