The Dust and Molecular Gas in the Brightest Cluster Galaxy in MACS 1931.8-2635

Abstract

We present new ALMA observations of the molecular gas and far-infrared continuum around the brightest cluster galaxy (BCG) in the cool-core cluster MACS 1931.8-2635. Our observations reveal $1.9\pm 0.3\times 10^{10}$ M${}_{\odot }$ of molecular gas, on par with the largest known reservoirs of cold gas in a cluster core. We detect CO(1-0), CO(3-2), and CO(4-3) emission from both diffuse and compact molecular gas components that extend from the BCG center out to $\sim 30$ kpc to the northwest, tracing the UV knots and H$\alpha$ filaments observed by HST. Due to the lack of morphological symmetry, we hypothesize that the $\sim 300$ km s${}^{-1}$ velocity of the CO in the tail is not due to concurrent uplift by AGN jets, rather we may be observing the aftermath of a recent AGN outburst. The CO spectral line energy distribution suggests that molecular gas excitation is influenced by processes related to both star formation and recent AGN feedback. Continuum emission in Bands 6 and 7 arises from dust and is spatially coincident with young stars and nebular emission observed in the UV and optical. We constrain the temperature of several dust clumps to be $\lesssim 10$ K, which is too cold to be directly interacting with the surrounding $\sim 4.8$ keV intracluster medium (ICM). The cold dust population extends beyond the observed CO emission and must either be protected from interacting with the ICM or be surrounded by local volumes of ICM that are several keV colder than observed by Chandra.

Accepted for Publication in ApJ, 19 pages, 11 figures. Minor revisions to the discussion and accompanying figure

References in corpus (25)

• Heating Hot Atmospheres with Active Galactic Nuclei
• Diffuse Radio Emission from Galaxy Clusters
• Distant Radio Galaxies and their Environments
• CO excitation of normal star forming galaxies out to z=1.5 as regulated by the properties of their interstellar medium
• An Infrared Survey of Brightest Cluster Galaxies. II: Why are Some Brightest Cluster Galaxies Forming Stars?
• Regulation of star formation in giant galaxies by precipitation, feedback, and conduction
• Raining on black holes and massive galaxies: the top-down multiphase condensation model
• The Herschel Comprehensive (U)LIRG Emission Survey (HerCULES): CO Ladders, fine structure lines, and neutral gas cooling
• Magnetic support of the optical emission line filaments in NGC 1275
• Chaotic cold accretion on to black holes in rotating atmospheres
• Molecular Gas in the Halo Fuels the Growth of a Massive Cluster Galaxy at High Redshift
• ALMA observations of massive molecular gas filaments encasing radio bubbles in the Phoenix cluster
• Ultraviolet Morphologies and Star-Formation Rates of CLASH Brightest Cluster Galaxies
• Cold gas in the Perseus cluster core: Excitation of molecular gas in filaments
• Close entrainment of massive molecular gas flows by radio bubbles in the central galaxy of Abell 1795
• Filamentary Star Formation in NGC 1275
• Nonthermal Emission Associated with Strong AGN Outbursts at the Centers of Galaxy Clusters
• Ultraviolet-to-Far-Infrared Properties of Local Star-Forming Galaxies
• Molecular Gas Along a Bright H-alpha Filament in 2A 0335+096 Revealed by ALMA
• Deep and narrow CO absorption revealing molecular clouds in the Hydra-A brightest cluster galaxy
• ALMA observation of the disruption of molecular gas in M87
• A ${}^{13}$CO Detection in a Brightest Cluster Galaxy
• JVLA 1.5GHz continuum observation of CLASH clusters I: radio properties of the BCGs
• The challenging task of determining star formation rates: the case of a massive stellar burst in the brightest cluster galaxy of Phoenix galaxy cluster
• Role of Electon Excitation and Nature of Molecular Gas in Cluster Central Elliptical Galaxies

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• Hidden Cooling Flows in Clusters of Galaxies II: A Wider Sample
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• Physical properties of more than one thousand brightest cluster galaxies detected in the Canada France Hawaii Telescope Legacy Survey
• A CO Survey of SpARCS Star-Forming Brightest Cluster Galaxies: Evidence for Uniformity in BCG Molecular Gas Processing Across Cosmic Time
• Star forming and gas rich brightest cluster galaxies at $z\sim 0.4$ in the Kilo-Degree Survey
• The correlation between the 500 pc scale molecular gas masses and AGN powers for massive elliptical galaxies
• Star forming brightest cluster galaxies at $z\sim 0.4$ in KiDS. Further studies of cold gas and stellar properties
• The Evolution of Brightest Cluster Galaxies in the Nearby Universe II: The star-formation activity and the Stellar Mass from Spectral Energy Distribution
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