The hidden circumgalactic medium

Cicone, C.; Breuck, C. De; Chen, Chian-Chou; Kampen, Eelco van; Narayanan, Desika; Mroczkowski, Tony; Andreani, P.; Klaassen, Pamela; Weiß, A.; Kohno, Kotaro; Kauffmann, Jens; Wagg, Jeff; Riechers, Dominik A.; Gullberg, B.; Shen, Sijing; Hill, J. Colin; Brownson, Simcha

doi:10.48550/arxiv.1903.04531

Cited by 2 publications

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“…On the other hand, a new facility such as the Atacama Large Aperture Submillimeter Telescope (AtLAST; see e.g. Bertoldi 2018;Cicone et al 2019) with a large (> 1 • ) field of view capable of surveying the entire cluster field in reasonable integration times at a resolution sufficient to resolve the member galaxies (≈ 5. 4 at 230 GHz) would present a transformative leap for studies such as that presented here.…”

Section: Discussionmentioning

confidence: 99%

Large Molecular Gas Reservoirs in Star-forming Cluster Galaxies

Cairns

Stroe

Breuck

et al. 2019

ApJ

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We present CO(2-1) observations of 72 galaxies in the nearby, disturbed Antlia galaxy cluster with the Atacama Pathfinder Experiment (APEX) telescope. The galaxies in our sample are selected to span a wide range of stellar masses (10 8 M M 10 10 M ) and star formation rates (0.0005 M yr −1 < SFR < 0.3 M yr −1 ). Reaching a depth of 23 mJy in 50 km s −1 channels, we report a total CO detection rate of 37.5% and a CO detection rate of 86% for sources within 1 dex of the main sequence. We compare our sample with a similar sample of galaxies in the field, finding that, for a fixed stellar mass and SFR, galaxies in the Antlia cluster have comparable molecular gas reservoirs to field galaxies. We find that ∼ 41% (11/27) of our CO detections display non-Gaussian CO(2-1) emission line profiles, and a number of these sources display evidence of quenching in their optical images. We also find that the majority of our sample lie either just below, or far below the main sequence of field galaxies, further hinting at potential ongoing quenching. We conclude that the Antlia cluster represents an intermediate environment between fields and dense clusters, where the gentler intracluster medium (ICM) allows the cluster members to retain their reservoirs of molecular gas, but in which the disturbed ICM is just beginning to influence the member galaxies, resulting in high SFRs and possible ongoing quenching.

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Section: Discussionmentioning

confidence: 99%

Large Molecular Gas Reservoirs in Star-forming Cluster Galaxies

Cairns

Stroe

Breuck

et al. 2019

ApJ

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“…Complementary ALMA observations of the high-J CO transitions at higher frequencies can easily over-resolve or resolve out emission from widespread gas reservoirs. A large millimeter single-dish telescope, such as the Atacama Large Aperture Submillimeter Telescope (At-LAST; Bertoldi 2018;Cicone et al 2019;Klaassen et al 2020), can recover all the flux of the high-J CO lines.…”

Section: Gas Excitation: Ism or Cgm?mentioning

confidence: 99%

CO Survey of High-z Radio Galaxies, Revisited with the Atacama Large Millimeter/submillimeter Array: Jet–Cloud Alignments and Synchrotron Brightening by Molecular Gas in the Circumgalactic Environment

Emonts

Lehnert

Lebowitz

et al. 2023

ApJ

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Powerful radio sources associated with supermassive black holes are among the most luminous objects in the universe, and are frequently recognized both as cosmological probes and active constituents in the evolution of galaxies. We present alignments between radio jets and cold molecular gas in the environment of distant radio galaxies, and show that the brightness of the radio synchrotron source can be enhanced by its interplay with the molecular gas. Our work is based on CO J > 1 observations with the Atacama Large Millimeter/submillimeter Array (ALMA) of three radio galaxies with redshifts in the range 1.4 < z < 2.1, namely MRC 0114-211 (z = 1.41), MRC 0156-252 (z = 2.02), and MRC 2048-272 (z = 2.05). These ALMA observations support previous work that found molecular gas out to 50 kpc in the circumgalactic environment, based on a CO(1–0) survey performed with the Australia Telescope Compact Array. The CO emission is found along the radio axes but beyond the main radio lobes. When compared to a large sample of high-z radio galaxies from the literature, we find that the presence of this cold molecular medium correlates with an increased flux-density ratio of the main versus counter-lobe. This suggest that the radio lobe brightens when encountering cold molecular gas in the environment. While part of the molecular gas is likely related to the interstellar medium from either the host or a companion galaxy, a significant fraction of the molecular gas in these systems shows very low excitation, with r 2−1/1−0 and r 3−2/1−0 values ≲0.2. This could be part of the circumgalactic medium.

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The hidden circumgalactic medium

Cited by 2 publications

References 0 publications

Large Molecular Gas Reservoirs in Star-forming Cluster Galaxies

Large Molecular Gas Reservoirs in Star-forming Cluster Galaxies

CO Survey of High-z Radio Galaxies, Revisited with the Atacama Large Millimeter/submillimeter Array: Jet–Cloud Alignments and Synchrotron Brightening by Molecular Gas in the Circumgalactic Environment

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