An extended cold gas absorber in a central cluster galaxy

Abstract

We present the serendipitous discovery of an extended cold gas structure projected close to the brightest cluster galaxy (BCG) of the z=0.045 cluster Abell 3716, from archival integral field spectroscopy. The gas is revealed through narrow Na D line absorption, seen against the stellar light of the BCG, which can be traced for $\sim$25 kpc, with a width of 2-4 kpc. The gas is offset to higher velocity than the BCG (by $\sim$100 km/s), showing that it is infalling rather than outflowing; the intrinsic linewidth is $\sim$80 km/s (FWHM). Very weak H$\alpha$ line emission is detected from the structure, and a weak dust absorption feature is suggested from optical imaging, but no stellar counterpart has been identified. We discuss some possible interpretations for the absorber: as a projected low-surface-brightness galaxy, as a stream of gas that was stripped from an infalling cluster galaxy, or as a "retired" cool-core nebula filament.

arXiv commentMNRAS Letters, accepted

References in corpus (25)

• The MUSE second-generation VLT instrument
• An Empirical Relation between Sodium Absorption and Dust Extinction
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. I. Science goals, survey design and instrumentation
• Virgo Galaxies with Long One-Sided HI Tails
• A large HI cloud near the centre of the Virgo cluster
• Ultraviolet tails and trails in cluster galaxies: A sample of candidate gaseous stripping events in Coma
• A dozen new galaxies caught in the act: Gas stripping and extended emission line regions in the Coma cluster
• Cold, clumpy accretion onto an active supermassive black hole
• A Mechanism for Stimulating AGN Feedback by Lifting Gas in Massive Galaxies
• Hubble Space Telescope Imaging of Brightest Cluster Galaxies
• Abundant molecular gas and inefficient star formation in intracluster regions: Ram pressure stripped tail of the Norma galaxy ESO137-001
• A 70 kpc X-ray tail in the cluster A3627
• On the origin and excitation of the extended nebula surrounding NGC 1275
• The Tail of the Stripped Gas that Cooled: HI, Halpha and X-ray Observational Signatures of Ram Pressure Stripping
• Optical Emission Line Nebulae in Galaxy Cluster Cores 1: The Morphological, Kinematic and Spectral Properties of the Sample
• A Comprehensive Study of the Radio Properties of Brightest Cluster Galaxies
• WINGS Data Release: a database of galaxies in nearby clusters
• Star formation and UV colors of the brightest Cluster Galaxies in the representative XMM-Newton Cluster Structure Survey
• The giant H-alpha/X-ray filament in the cluster of galaxies A1795
• The local Tully-Fisher relation for dwarf galaxies
• HST imaging of the dusty filaments and nucleus swirl in NGC4696 at the centre of the Centaurus Cluster
• HST Imaging of Dust Structures and Stars in the Ram Pressure Stripped Virgo Spirals NGC 4402 and NGC 4522: Stripped from the Outside In with Dense Cloud Decoupling
• An X-ray absorption analysis of the high-velocity system in NGC 1275
• Cold Molecular Gas Along the Cooling X-ray Filament in Abell 1795
• Chandra and XMM-Newton Observations of the Bimodal Planck SZ-detected Cluster PLCKG345.40-39.34 (A3716) with High and Low Entropy Subcluster Cores

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