DINGO/GAMA /WAVES: HI-halo mass relation
Ajay Dev, Martin Meyer, Simon P. Driver, Jonghwan Rhee, Trystan S. Lambert + 15 more
TLDR
This paper investigates the HI-halo mass relation using DINGO/GAMA/WAVES data, revealing a double power-law and satellite HI dominance at high halo masses.
Key contributions
- Investigates the HI-halo mass relation using DINGO/GAMA/WAVES data across a wide mass range.
- Introduces a novel stacking method using WAVES photometric members to extend beyond spectroscopic limits.
- Discovers a double power-law HIHM relation with a turnover at M_h ~ 10^11.2 M_sun.
- Shows satellites dominate halo HI content above M_h ~ 6x10^12 M_sun, increasing measured HI by 1.5-3x.
Why it matters
This study advances understanding of neutral hydrogen distribution within dark matter halos. A novel stacking method, incorporating photometric members, provides more accurate HI content measurements for gas-rich satellites. This clarifies the roles of central and satellite galaxies in the overall HI budget of groups and clusters.
Original Abstract
We investigate the relation between neutral atomic hydrogen (HI) and dark matter halo mass (HIHM) using observations from the Deep Investigation of Neutral Gas Origins (DINGO) pilot survey 100h data, combined with spectroscopic data from the Galaxy and Mass Assembly (GAMA) survey and photometric data from the Wide Area VISTA Extragalactic Survey (WAVES) photometric catalog. We employ a combination of direct detections and spectral stacking to probe the HI content of halos across a wide mass range ($10^{10.5} \lesssim M_\mathrm{h}/M_\odot \lesssim 10^{14.5}$). By incorporating WAVES photometric members on top of the existing GAMA group catalog, we present a novel approach of extending stacking analyses beyond spectroscopic completeness limits, enabling recovery of satellite HI content otherwise missed. We find that the HIHM relation exhibits a double power-law form, with a turnover near $M_\mathrm{h} \sim 10^{11.2} \text{ M}_\odot$. Central galaxies dominate the halo HI budget below $M_\mathrm{h} \sim 6 \times 10^{12} \text{ M}_\odot$, while satellites dominate at higher halo masses. Including photometric members increases the measured HI content in halos above $10^{13} \text{ M}_\odot$ by a factor of 1.5-3, highlighting the importance of gas-rich satellites in the group and cluster regime. Comparison with previous group-stacking studies shows that low-surface brightness galaxies, and intra-group HI structures contribute only a minor fraction to the total HI mass in group and cluster halos, as the summed galaxy HI masses are consistent with the total halo HI content.
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