An emission map of the disk-circumgalactic medium transition in starburst IRAS 08339+6517

Abstract

Most of a galaxy's mass is located out to hundreds of kiloparsecs beyond its stellar component. This diffuse reservoir of gas, the circumgalactic medium (CGM), acts as the interface between a galaxy and the cosmic web that connects galaxies. We present kiloparsec-scale resolution integral field spectroscopy of emission lines that trace cool ionized gas from the center of a nearby galaxy to 30 kpc into its CGM. We find a smooth surface brightness profile with a break in slope at twice the 90% stellar radius. The gas also transitions from being photoionized by HII star-forming regions in the disk to being ionized by shocks or the extragalactic UV background at larger distances. These changes represent the boundary between the interstellar medium (ISM) and the CGM, revealing how the dominant reservoir of baryonic matter directly connects to its galaxy.

20 pages, 3 figures, 2 extended data figures, 2 tables. Authors' version. Accepted: 14 Aug 2024. Published in Nature Astronomy 6 Sep 2024

References in corpus (21)

• The Circumgalactic Medium
• The MAPPINGS III Library of Fast Radiative Shock Models
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• Understanding Galaxy Evolution through Emission Lines
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy
• Resolving small-scale cold circumgalactic gas in TNG50
• Evolution of the Cool Gas in the Circumgalactic Medium (CGM) of Massive Halos -- A Keck Cosmic Web Imager (KCWI) Survey of Ly$\alpha$ Emission around QSOs at $z\approx 2$
• A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
• MusE GAs FLOw and Wind (MEGAFLOW) VIII. Discovery of a MgII emission halo probed by a quasar sightline
• Empirically Constrained Predictions for Metal-Line Emission from the Circumgalactic Medium
• The DUVET Survey: Resolved Maps of Star Formation Driven Outflows in a Compact, Starbursting Disk Galaxy
• Metal line emission from galaxy haloes at z~1
• In search of cool flow accretion onto galaxies $-$ where does the disk gas end?
• Hydrogen Emission from the Ionized Gaseous Halos of Low Redshift Galaxies
• A Complex Multiphase DLA Associated with a Compact Group at z=2.431 Traces Accretion, Outflows, and Tidal Streams
• Extreme Variation in Star Formation Efficiency Across a Compact, Starbursting Disk Galaxy
• DUVET: Spatially Resolved Observations of Star Formation Regulation via Galactic Outflows in a Starbursting Disk Galaxy
• The Ionization and Dynamics of the Makani Galactic Wind
• Physical properties and evolutionary state of the Lyman alpha emitting starburst galaxy IRAS 08339+6517
• Absorption-based Circumgalactic Medium Line Emission Estimates

Cited by in corpus (5)

• Direct high-resolution observation of feedback and chemical enrichment in the circumgalactic medium at redshift z ~ 2.8
• Misty, patchy, and turbulent: constraining the cool circumgalactic medium with mCC
• Ultra-strong MgII absorbers trace both inflowing and outflowing gas: insights from dual down-the-barrel and quasar sightlines
• A z$\sim$1 galactic-scale outflow transversally mapped to $\sim$50 kpc through gravitational-arc tomography
• Modeling Emission-Line Surface Brightness in a Multiphase Galactic Wind: An O VI Case Study