Measurements of the dependence of stellar specific angular momentum (jββ)
on stellar mass (Mββ) are presented for large samples of ALFALFA galaxies
spanning the stellar mass range βΌ108-1011 Mββ. Accurate
estimates of jββ are generated using measurements of I-band effective
radius and velocity width of the HI line profile. While the full sample
(N=3Β 607) of galaxies yields a jββ-Mββ relation with power-law index
Ξ±=0.404Β±0.03, it is shown that various sub-samples have indices
that are very similar to the best literature results, yet with comparatively
lower intrinsic scatters. A galaxy's mean I-band surface brightness within
its effective radius () is shown to significantly correlate
with $j_*$-$M_*$ scatter. A 3D plane fit to all $N=3~607$ galaxies in
$\log_{10}j_*$-$\log_{10}M_*$- space yields j_*\propto
M_*^{0.589\pm 0.002}^{0.193\pm 0.002} with scatter
Ο=0.089 dex. -selected sub-samples of size up to
N=1Β 450 yield power-law jββ-Mββ relations mostly consistent with
Ξ±=0.55Β±0.02 from the literature and with intrinsic scatter ranging
from 0.083 to 0.129 dex. Thus, this paper presents new, highly accurate
measurements of the jββ-Mββ relation that can be used to better understand
the important roles played by angular momentum in the formation and evolution
of galaxies.Comment: 12 pages, 7 figures. Accepted for publication in MNRA