2024/10/07 by Zhang, Huanian, Zaritsky, Dennis
#Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences
paper · doi:10.48550/arxiv.2410.05392
The recent detection of optical emission lines from the circumgalactic medium (CGM) in combined, large samples of low-redshift, normal galaxy spectra hints at the potential to map the cool (∼ 104 K) CGM in individual, representative galaxies. Using archival data from a forefront instrument (MUSE) on the VLT, we present a source-blind, wide-redshift-range (z ∼ 0-5) narrow-band imaging survey for CGM emission. Our detected, resolved emission line sources are cataloged and include a 30 kpc wide Hα source likely tracing the CGM of a low-mass galaxy (stellar mass ∼ 108.78±0.42 M_\odot) at z=0.1723, a 60 kpc wide Ly α structure associated with a galaxy at z=3.9076, and a 130 kpc (∼ r\rm vir) wide [O II] feature revealing an interaction between a galaxy pair at z=1.2480. The Hα velocity field for the low-mass galaxy suggests that the CGM is more chaotic or turbulent than the galaxy disk, while that for the interacting galaxies shows large-scale (∼ 50 kpc) coherent motions.