EDGE – Dark matter or astrophysics? Breaking dark matter heating degeneracies with H i rotation in faint dwarf galaxies
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2024)
Abstract:
EDGE – Dark matter or astrophysics? Breaking dark matter heating degeneracies with H i rotation in faint dwarf galaxies
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2024) stae718
MIGHTEE-H i : H i galaxy properties in the large scale structure environment at z ∼ 0.37 from a stacking experiment
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2024)
Abstract:
<jats:title>Abstract</jats:title> <jats:p>We present the first measurement of HI mass of star-forming galaxies in different large scale structure environments from a blind survey at z ∼ 0.37. In particular, we carry out a spectral line stacking analysis considering 2875 spectra of colour-selected star-forming galaxies undetected in HI at 0.23 &lt; z &lt; 0.49 in the COSMOS field, extracted from the MIGHTEE-HI Early Science datacubes, acquired with the MeerKAT radio telescope. We stack galaxies belonging to different subsamples depending on three different definitions of large scale structure environment: local galaxy overdensity, position inside the host dark matter halo (central, satellite, or isolated), and cosmic web type (field, filament, or knot). We first stack the full star-forming galaxy sample and find a robust HI detection yielding an average galaxy HI mass of MHI = (8.12 ± 0.75) × 109 M⊙ at ∼11.8σ. Next, we investigate the different subsamples finding a negligible difference in MHI as a function of the galaxy overdensity. We report an HI excess compared to the full sample in satellite galaxies (MHI = (11.31 ± 1.22) × 109, at ∼10.2σ) and in filaments (MHI = (11.62 ± 0.90) × 109. Conversely, we report non-detections for the central and knot galaxies subsamples, which appear to be HI-deficient. We find the same qualitative results also when stacking in units of HI fraction (fHI). We conclude that the HI amount in star-forming galaxies at the studied redshifts correlates with the large scale structure environment.</jats:p>Deconvolution of JWST/MIRI Images: Applications to an Active Galactic Nucleus Model and GATOS Observations of NGC 5728
The Astronomical Journal American Astronomical Society 167:3 (2024) 96
On the Significance of the Thick Disks of Disk Galaxies
The Astrophysical Journal Supplement Series American Astronomical Society 271:1 (2024) 1