- "NGC 2655: From inner polar ring to outer shells and tails"
Sparke LS, van Moorsel G, Erwin P, et al., Astronomical Journal 135 (1): 99-111 2008. NGC 2655, a nearby bright S0/a galaxy in a loose group, has strongly asymmetric central dust lanes and an extended disk of neutral hydrogen gas. Here we present deep optical images showing tidal arms and regions of diffuse starlight well beyond the main galaxy, suggestive of a recent merger.
- Galaxies in the Universe: an Introduction
(Book) L.S. Sparke & J.S. Gallagher, III, Cambridge University Press 2000; second edition 2007. This book is a `with-calculus' introduction, aimed primarily at third- and fourth-year undergraduate students of astronomy or physics, who have taken the first year or two of university-level physics.
- "The photometric and kinematic structure of face-on disk galaxies. I. Sample definition, H alpha integral field spectroscopy, and HI line widths"
Andersen DR, Bershady MA, Sparke LS, et al., Astrophysical Journal Supplement Series 166 (2): 505-525 Oct 2006. We find H I and H alpha line profiles to be similar in width but different in shape, indicating that we are observing different spatial distributions of ionized and neutral gas in largely axisymmetric systems with flat outer rotation curves.
- "Stellar kinematics for the central spheroid in the polar disk galaxy NGC 4650A"
Iodice E, Arnaboldi M, Saglia RP, et al., Astrophysical Journal 643 (1): 200-209 Part 1May 2006. The new high-resolution kinematic data suggest that the stellar component in NGC 4650A resembles a nearly exponential oblate spheroid supported by rotation.