The formation channels of multiphase gas in nearby early-type galaxies

Abstract

The processes responsible for the assembly of cold and warm gas in early-type galaxies (ETGs) are not well-understood. We report on the multiwavelength properties of 15 non-central, nearby ($z\le$ 0.00889) ETGs primarily through Multi-Unit Spectroscopic Explorer (MUSE) and Chandra X-ray observations, to address the origin of their multiphase gas. The MUSE data reveals 8/15 sources contain warm ionized gas traced by the H$\alpha$ emission line. The morphology of this gas is found to be filamentary in 3/8 sources: NGC 1266, NGC 4374, and NGC 4684 which is similar to that observed in many group and cluster-centered galaxies. All H$\alpha$ filamentary sources have X-ray luminosities exceeding the expected emission from the stellar population, suggesting the presence of diffuse hot gas which likely cooled to form the cooler phases. The morphology of the remaining 5/8 sources are rotating gas disks, not as commonly observed in higher mass systems. Chandra X-ray observations (when available) of the ETGs with rotating H$\alpha$ disks indicate that they are nearly void of hot gas. A mixture of stellar mass loss and external accretion was likely the dominant channel for the cool gas in NGC 4526 and NGC 4710. These ETGs show full kinematic alignment between their stars and gas, and are fast rotators. The H$\alpha$ features within NGC 4191 (clumpy, potentially star-forming ring), NGC 4643 and NGC 5507 (extended structures) along with loosely overlapping stellar and gas populations allow us to attribute external accretion to be the primary formation channel of the cool gas in these systems.

16 pages, 7 figures, accepted for publication in MNRAS

References in corpus (21)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Heating Hot Atmospheres with Active Galactic Nuclei
• The Data Processing Pipeline for the MUSE Instrument
• The Regulation of Cooling and Star Formation in Luminous Galaxies by AGN Feedback and the Cooling-Time/Entropy Threshold for the Onset of Star Formation
• An Entropy Threshold for Strong H-alpha and Radio Emission in the Cores of Galaxy Clusters
• Galaxy And Mass Assembly (GAMA): autoz spectral redshift measurements, confidence and errors
• Cooling Time, Freefall Time, and Precipitation in the Cores of ACCEPT Galaxy Clusters
• Suppression of Star Formation in NGC 1266
• The Complete Local Volume Groups Sample - I. Sample Selection and X-ray Properties of the High-Richness Subsample
• The origin of the atomic and molecular gas contents of early-type galaxies. II. Misaligned gas accretion
• Building gas rings and rejuvenating S0 galaxies through minor mergers
• Cold gas in group-dominant elliptical galaxies
• The effects of galaxy shape and rotation on the X-ray haloes of early-type galaxies - II. Numerical simulations
• Gas condensation in Brightest Group Galaxies unveiled with MUSE
• Mass Loss From Planetary Nebulae in Elliptical Galaxies
• Probing multiphase gas in local massive elliptical galaxies via multiwavelength observations
• Merger histories of brightest group galaxies from MUSE stellar kinematics
• The Complete Local Volume Groups Sample -- IV. Star formation and gas content in group-dominant galaxies
• AGN feedback duty cycle in Planck SZ selected clusters using Chandra observations
• X-ray Constraints on the Hot Gas Content of Early-type Galaxies in Virgo

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