A MeerKAT view of pre-processing in the Fornax A group

Abstract

We present MeerKAT neutral hydrogen (HI) observations of the Fornax A group, that is likely falling into the Fornax cluster for the first time. Our HI image is sensitive to 1.4 x 10${}^{19}$ cm${}^{-2}$ over 44.1 km s${}^{-1}$, where we detect HI in 10 galaxies and a total of 1.12 x 10${}^9$ Msol of HI in the intra-group medium (IGM). We search for signs of pre-processing in the 12 group galaxies with confirmed optical redshifts that reside within our HI image. There are 9 galaxies that show evidence of pre-processing and we classify the pre-processing status of each galaxy, according to their HI morphology and gas (atomic and molecular) scaling relations. Galaxies yet to experience pre-processing have extended HI disks, a high HI content with a H${}_2$-to-HI ratio an order of magnitude lower than the median for their stellar mass. Galaxies currently being pre-processed display HI tails, truncated HI disks with typical gas ratios. Galaxies in the advanced stages of pre-processing are HI deficient. If there is any HI, they have lost their outer HI disk and efficiently converted their HI to H${}_2$, resulting in H${}_2$-to-HI ratios an order of magnitude higher than the median for their stellar mass. The central, massive galaxy in our group underwent a 10:1 merger 2 Gyr ago, and ejected 6.6 - 11.2 x 10${}^8$ Msol of HI that we detect as clouds and streams in the IGM, some forming coherent structures up to 220 kpc in length. We also detect giant (100 kpc) ionised hydrogen (H$\alpha$) filaments in the IGM, likely from cool gas being removed (and ionised) from an infalling satellite. The H$\alpha$ filaments are situated within the hot halo of NGC 1316 and some regions contain HI. We speculate that the H$\alpha$ and multiphase gas is supported by magnetic pressure (possibly assisted by the AGN), such that the hot gas can condense and form HI that survives in the hot halo for cosmological timescales.

arXiv comment18 pages, 9 figured. Accepted for publication in Astronomy and Astrophysics (A&A)

References in corpus (94)

• The CO-to-H2 Conversion Factor
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Quantifying the bimodal color-magnitude distribution of galaxies
• Nearly 5000 Distant Early-Type Galaxies in COMBO-17: a Red Sequence and its Evolution since z~1
• Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release
• Dust Masses, PAH Abundances, and Starlight Intensities in the SINGS Galaxy Sample
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• Galaxy Star-Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey
• The 2dF Galaxy Redshift Survey: The environmental dependence of galaxy star formation rates near clusters
• The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies
• Properties of Galaxy Groups in the SDSS: I.-- The Dependence of Colour, Star Formation, and Morphology on Halo Mass
• Galaxy And Mass Assembly: Stellar Mass Estimates
• The HIPASS Catalogue - I. Data Presentation
• The 1000 Brightest HIPASS Galaxies: HI Properties
• Galaxy evolution in groups and clusters: star formation rates, red sequence fractions, and the persistent bimodality
• Galaxy ecology: groups and low-density environments in the SDSS and 2dFGRS
• xGASS: Total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local Universe
• Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue
• A morphological algorithm for improving radio-frequency interference detection
• Galaxy and Mass Assembly (GAMA): The GAMA Galaxy Group Catalogue (G3Cv1)
• Virgo Galaxies with Long One-Sided HI Tails
• An optimized algorithm for multi-scale wideband deconvolution of radio astronomical images
• The Herschel Reference Survey
• Pre-Processing of Galaxies before Entering a Cluster
• SoFiA: a flexible source finder for 3D spectral line data
• The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+)
• LoCuSS: The slow quenching of star formation in cluster galaxies and the need for pre-processing
• Dependence of Galaxy Quenching on Halo Mass and Distance from its Centre
• The GALEX Arecibo SDSS Survey. VIII. Final Data Release -- The Effect of Group Environment on the Gas Content of Massive Galaxies
• Cold gas properties of the Herschel Reference Survey. II. Molecular and total gas scaling relations
• Resolving small-scale cold circumgalactic gas in TNG50
• The Fornax Deep Survey with VST. I. The extended and diffuse stellar halo of NGC~1399 out to 192 kpc
• Quenched fractions in the IllustrisTNG simulations: the roles of AGN feedback, environment, and pre-processing
• Witnessing galaxy preprocessing in the local Universe: the case of a star-bursting group falling into Abell 1367
• Simulations of ram-pressure stripping in galaxy-cluster interactions
• Mapping the cold dust temperatures and masses of nearby Kingfish galaxies with Herschel
• Spectacular tails of ionised gas in the Virgo cluster galaxy NGC 4569
• The Void Galaxy Survey: Optical Properties and H I Morphology and Kinematics
• The Different Physical Mechanisms that Drive the Star-Formation Histories of Giant and Dwarf Galaxies
• LoCuSS: The steady decline and slow quenching of star formation in cluster galaxies over the last four billion years
• CubiCal - Fast radio interferometric calibration suite exploiting complex optimisation
• The evolution and star formation of dwarf galaxies in the Fornax Cluster
• The 1.28 GHz MeerKAT DEEP2 Image
• A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).I. Introduction to the Survey
• The Herschel Virgo Cluster Survey: II. Truncated dust disks in HI-deficient spirals
• A Spectacular H$\alpha$ Complex in Virgo: Evidence for a Collision Between M86 and NGC 4438 and Implications for Collisional ISM Heating of Ellipticals
• The star cluster system of the 3 Gyr old merger remnant NGC 1316: Clues from optical and near-infrared photometry
• Galaxy Evolution in Hickson Compact Groups: The Role of Ram Pressure Stripping and Strangulation
• Overview on spectral line source finding and visualisation
• The Fornax Deep Survey with VST. II. Fornax A: a two-phase assembly caught on act
• Gas and dark matter in the Sculptor group: NGC 300
• The Fornax Deep Survey (FDS) with VST. VI. Optical properties of the dwarf galaxies in the Fornax cluster
• Galaxy destruction and diffuse light in clusters
• LoCuSS: Pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2
• Collimated synchrotron threads linking the radio lobes of ESO137-006
• Plunging fireworks: Why do infalling galaxies light up on the outskirts of clusters?
• The galaxy populations from the centers to the infall regions in z~0.25 clusters
• A high-resolution mosaic of the neutral hydrogen in the M81 triplet
• The surface abundances of Red Supergiants at core-collapse
• The high molecular gas content, and the efficient conversion of neutral into molecular gas, in jellyfish galaxies
• Atomic and molecular gas in the merger galaxy NGC 1316 (Fornax A) and its environment
• Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes
• Highly ordered magnetic fields in the tail of the jellyfish galaxy JO206
• Evidence of pre-processing and a dependence on dynamical state for low-mass satellite galaxies
• Extended ionized gas clouds in the Abell 1367 cluster
• Using negative detections to estimate source finder reliability
• GASP. XII. The variety of physical processes occurring in a single galaxy group in formation
• WALLABY Early Science - III. An HI Study of the Spiral Galaxy NGC 1566
• Constraining the Outburst Properties of the SMBH in Fornax A through X-ray, Infrared, and Radio Observations
• The flickering nuclear activity of Fornax A
• Warm Ionized Gas Revealed in the Magellanic Bridge Tidal Remnant: Constraining the Baryon Content and the Escaping Ionizing Photons around Dwarf Galaxies
• A spectroscopic census of the Fornax cluster and beyond: preparing for next generation surveys
• The ACS Fornax Cluster Survey. III. Globular Cluster Specific Frequencies of Early-Type Galaxies
• The Fornax Deep Survey with VST. VII. Evolution and Structure of Late Type Galaxies inside the Virial Radius of the Fornax Cluster
• Update on HI data collection from GBT, Parkes and Arecibo telescopes for the Cosmic Flows project
• The Fornax Deep Survey with VST. X. The assembly history of the bright galaxies and intra-group light in the Fornax A subgroup
• MUSE sneaks a peek at extreme ram-pressure stripping events - IV. Hydrodynamic and gravitational interactions in the Blue Infalling Group
• The Carnegie-Chicago Hubble Program. V. The Distances to NGC 1448 and NGC 1316 via the Tip of the Red Giant Branch
• Hot and Cold Galactic Gas in the NGC 2563 Galaxy Group
• Galaxy and Mass Assembly (GAMA): Demonstrating the power of WISE in the study of Galaxy Groups to $z<0.1$
• The Neutral Hydrogen Content of Fornax Cluster Galaxies
• The distance to NGC1316 (Fornax A): yet another curious case
• Evidence for galaxies being pre-processed before accreted into clusters
• Broadband radio polarimetry of Fornax A, I: Depolarized patches generated by advected thermal material from NGC 1316
• Neutral hydrogen gas within and around NGC 1316
• Impacts of a Supersonic Shock Front on Star Formation in the Bullet Cluster
• WALLABY Early Science -- IV. ASKAP HI imaging of the nearby galaxy IC 5201
• HI in Group Interactions: HCG 44
• The globular cluster system of NGC1316. III. Kinematic complexity
• FCC046: a candidate gaseous polar ring dwarf elliptical galaxy in the Fornax Cluster
• Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by Morita Array of ALMA
• Evolution of galaxies in groups in the Coma Supercluster
• MeerKAT-16 HI observation of the dIrr galaxy WLM
• Blasting away a dwarf galaxy: The "tail" of ESO 324-G024

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• MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group
• VERTICO VI: Cold-gas asymmetries in Virgo cluster galaxies
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• A serendipitous discovery of HI-rich galaxy groups with MeerKAT
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• The S-PLUS Fornax Project (S+FP): Mapping H$\alpha$+[NII] emission in 77 Fornax galaxy members reaching $\sim$4 Rvir
• A MeerKAT study of a neutral hydrogen rich grouping of galaxies with megaparsec-scale filamentary-like structure
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• iDaVIE v1.0: A virtual reality tool for interactive analysis of astronomical data cubes
• The MeerKAT Fornax Survey -- I. Survey description and first evidence of ram pressure in the Fornax galaxy cluster
• Virtual Realities: Is there only one advanced image display that astronomers need?
• Recent Developments on the HI Gas of Low-Redshift Galaxies Seen by the 21cm Emission Lines
• A group of merging galaxies falling onto Abell 2142
• Young, blue, and isolated stellar systems in the Virgo Cluster. II. A new class of stellar system
• Starburst galaxies in the Hydra I cluster
• Galaxy groups in various evolutionary stages