Lyα haloes around low-luminosity LAEs at z≥6 have exponential scale lengths ~3× smaller than at z~3 under matched intrinsic surface-brightness sensitivity, with stacks of non-detections showing no extended emission at high-z.
An emission map of the disk-circumgalactic medium transition in starburst IRAS 08339+6517
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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.
fields
astro-ph.GA 1years
2026 1verdicts
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Lyman-alpha haloes in the aftermath of reionisation
Lyα haloes around low-luminosity LAEs at z≥6 have exponential scale lengths ~3× smaller than at z~3 under matched intrinsic surface-brightness sensitivity, with stacks of non-detections showing no extended emission at high-z.