TY - JOUR
T1 - Dark matter halos and scaling relations of extremely massive spiral galaxies from extended H I rotation curves
AU - Di Teodoro, E. M.
AU - Posti, L.
AU - Fall, S. M.
AU - Ogle, P. M.
AU - Jarrett, Thomas
AU - Appleton, P. N.
AU - Cluver, M. E.
AU - Haynes, M. P.
AU - Lisenfeld, U.
PY - 2023/2/1
Y1 - 2023/2/1
N2 - We present new and archival atomic hydrogen (H i) observations of 15 of the most massive spiral galaxies in the local Universe (M > 1011 M⊙). From 3D kinematic modeling of the datacubes, we derive extended H i rotation curves, and from these, we estimate masses of the dark matter halos and specific angular momenta of the discs. We confirm that massive spiral galaxies lie at the upper ends of the Tully-Fisher relation (mass vs velocity, M V4) and Fall relation (specific angular momentum vs mass, j ≈ M0.6), in both stellar and baryonic forms, with no significant deviations from single power laws. We study the connections between baryons and dark matter through the stellar (and baryon)-to-halo ratios of mass fM M*/Mh and specific angular momentum fj j/jh and fj, bar jbar/jh. Combining our sample with others from the literature for less massive disc-dominated galaxies, we find that fM rises monotonically with M* and Mh (instead of the inverted-U shaped fM for spheroid-dominated galaxies), while fj and fj, bar are essentially constant near unity over four decades in mass. Our results indicate that disc galaxies constitute a self-similar population of objects closely linked to the self-similarity of their dark halos. This picture is reminiscent of early analytical models of galaxy formation wherein discs grow by relatively smooth and gradual inflow, isolated from disruptive events such as major mergers and strong active galactic nuclei feedback, in contrast to the more chaotic growth of spheroids.
AB - We present new and archival atomic hydrogen (H i) observations of 15 of the most massive spiral galaxies in the local Universe (M > 1011 M⊙). From 3D kinematic modeling of the datacubes, we derive extended H i rotation curves, and from these, we estimate masses of the dark matter halos and specific angular momenta of the discs. We confirm that massive spiral galaxies lie at the upper ends of the Tully-Fisher relation (mass vs velocity, M V4) and Fall relation (specific angular momentum vs mass, j ≈ M0.6), in both stellar and baryonic forms, with no significant deviations from single power laws. We study the connections between baryons and dark matter through the stellar (and baryon)-to-halo ratios of mass fM M*/Mh and specific angular momentum fj j/jh and fj, bar jbar/jh. Combining our sample with others from the literature for less massive disc-dominated galaxies, we find that fM rises monotonically with M* and Mh (instead of the inverted-U shaped fM for spheroid-dominated galaxies), while fj and fj, bar are essentially constant near unity over four decades in mass. Our results indicate that disc galaxies constitute a self-similar population of objects closely linked to the self-similarity of their dark halos. This picture is reminiscent of early analytical models of galaxy formation wherein discs grow by relatively smooth and gradual inflow, isolated from disruptive events such as major mergers and strong active galactic nuclei feedback, in contrast to the more chaotic growth of spheroids.
UR - https://hdl.handle.net/1959.7/uws:73936
U2 - 10.1093/mnras/stac3424
DO - 10.1093/mnras/stac3424
M3 - Article
SN - 0035-8711
VL - 518
SP - 6340
EP - 6354
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -