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JWST MIRI/MRS observations of hot molecular gas in an AGN host galaxy at Cosmic Noon

Fuente: arXiv

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Auteurs principaux:	Kakkad, D., Mainieri, V., Tanaka, Takumi S., Silverman, John D., Law, D., Riffel, Rogemar A., Circosta, C., Bertola, E., Bianchin, M., Bischetti, M., Rivera, G. Calistro, Carniani, S., Cicone, C., Cresci, G., Costa, T., Harrison, C. M., Lamperti, I., Kalita, B., Koekemoer, Anton M., Marconi, A., Perna, M., Piconcelli, E., Puglisi, A., Ilha, Gabriele S., Tozzi, G., Vietri, G., Vignali, C., Ward, S., Zamorani, G., Zappacosta, L.
Format:	Preprint
Publié:	2025
Sujets:	Astrophysics of Galaxies High Energy Astrophysical Phenomena
Accès en ligne:	Acceder al recurso
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_version_	1866909678704787456
author	Kakkad, D. Mainieri, V. Tanaka, Takumi S. Silverman, John D. Law, D. Riffel, Rogemar A. Circosta, C. Bertola, E. Bianchin, M. Bischetti, M. Rivera, G. Calistro Carniani, S. Cicone, C. Cresci, G. Costa, T. Harrison, C. M. Lamperti, I. Kalita, B. Koekemoer, Anton M. Marconi, A. Perna, M. Piconcelli, E. Puglisi, A. Ilha, Gabriele S. Tozzi, G. Vietri, G. Vignali, C. Ward, S. Zamorani, G. Zappacosta, L.
author_facet	Kakkad, D. Mainieri, V. Tanaka, Takumi S. Silverman, John D. Law, D. Riffel, Rogemar A. Circosta, C. Bertola, E. Bianchin, M. Bischetti, M. Rivera, G. Calistro Carniani, S. Cicone, C. Cresci, G. Costa, T. Harrison, C. M. Lamperti, I. Kalita, B. Koekemoer, Anton M. Marconi, A. Perna, M. Piconcelli, E. Puglisi, A. Ilha, Gabriele S. Tozzi, G. Vietri, G. Vignali, C. Ward, S. Zamorani, G. Zappacosta, L.
contents	Active Galactic Nuclei (AGN) are believed to play a central role in quenching star formation by removing or destroying molecular gas from host galaxies via radiation-pressure driven outflows and/or radio jets. Some studies of cold molecular gas in galaxies at Cosmic Noon ($z\sim2$) show that AGN have less cold gas ($<$100 K) compared to mass-matched star-forming galaxies. However, cold gas could also be shock-heated to warmer phases, detectable via H$_{2}$ transitions in the rest-frame near- and mid-infrared spectra. The Medium Resolution Spectrograph (MRS) of the Mid-infrared Instrument (MIRI) aboard JWST has opened a unique window to observe these emission lines in galaxies at Cosmic Noon. We present the first detection of hot molecular gas in cid_346, an X-ray AGN at $z\sim2.2$, via the H$_{2}$ ro-vibrational transition at 2.12 $μ$m. We measure a hot molecular gas mass of $\sim 8.0 \times 10^{5}$ M$_{\odot}$, which is $\sim 10^{5}-10^{6}$ times lower than the cold molecular gas mass. cid_346 is located in an environment with extended gas structures and satellite galaxies. This is supported by detection of hot and cold molecular gas out to distances $>$10 kpc in MIRI/MRS and ALMA data, respectively and ancillary NIRCam imaging that reveals two satellite galaxies at distances of $\sim$0.4 arcsec (3.3 kpc) and $\sim$0.9 arcsec (7.4 kpc) from the AGN. Our results tentatively indicate that while the CO(3-2)-based cold gas phase dominates the molecular gas mass at Cosmic Noon, H$_{2}$ ro-vibrational transitions are effective in tracing hot molecular gas locally in regions that may lack CO emission.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_05354
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	JWST MIRI/MRS observations of hot molecular gas in an AGN host galaxy at Cosmic Noon Kakkad, D. Mainieri, V. Tanaka, Takumi S. Silverman, John D. Law, D. Riffel, Rogemar A. Circosta, C. Bertola, E. Bianchin, M. Bischetti, M. Rivera, G. Calistro Carniani, S. Cicone, C. Cresci, G. Costa, T. Harrison, C. M. Lamperti, I. Kalita, B. Koekemoer, Anton M. Marconi, A. Perna, M. Piconcelli, E. Puglisi, A. Ilha, Gabriele S. Tozzi, G. Vietri, G. Vignali, C. Ward, S. Zamorani, G. Zappacosta, L. Astrophysics of Galaxies High Energy Astrophysical Phenomena Active Galactic Nuclei (AGN) are believed to play a central role in quenching star formation by removing or destroying molecular gas from host galaxies via radiation-pressure driven outflows and/or radio jets. Some studies of cold molecular gas in galaxies at Cosmic Noon ($z\sim2$) show that AGN have less cold gas ($<$100 K) compared to mass-matched star-forming galaxies. However, cold gas could also be shock-heated to warmer phases, detectable via H$_{2}$ transitions in the rest-frame near- and mid-infrared spectra. The Medium Resolution Spectrograph (MRS) of the Mid-infrared Instrument (MIRI) aboard JWST has opened a unique window to observe these emission lines in galaxies at Cosmic Noon. We present the first detection of hot molecular gas in cid_346, an X-ray AGN at $z\sim2.2$, via the H$_{2}$ ro-vibrational transition at 2.12 $μ$m. We measure a hot molecular gas mass of $\sim 8.0 \times 10^{5}$ M$_{\odot}$, which is $\sim 10^{5}-10^{6}$ times lower than the cold molecular gas mass. cid_346 is located in an environment with extended gas structures and satellite galaxies. This is supported by detection of hot and cold molecular gas out to distances $>$10 kpc in MIRI/MRS and ALMA data, respectively and ancillary NIRCam imaging that reveals two satellite galaxies at distances of $\sim$0.4 arcsec (3.3 kpc) and $\sim$0.9 arcsec (7.4 kpc) from the AGN. Our results tentatively indicate that while the CO(3-2)-based cold gas phase dominates the molecular gas mass at Cosmic Noon, H$_{2}$ ro-vibrational transitions are effective in tracing hot molecular gas locally in regions that may lack CO emission.
title	JWST MIRI/MRS observations of hot molecular gas in an AGN host galaxy at Cosmic Noon
topic	Astrophysics of Galaxies High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2507.05354