We present a preliminary study of using the template of an ensemble of evolving shells we developed for M 82 (Yao 2009). we apply the model to represent various stages of starburst evolution in a well known sample of nearby luminous infrared galaxies (LIRGs). In this way, we attempt to interpret the relationship between the degree of molecular excitation and ratio of far-infrared (FIR) to CO lu...

We present a mark correlation analysis of the galaxies in the Sloan Digital Sky Survey using weights provided by MOPED. The large size of the sample permits statistically significant statements about how galaxies with different metallicities and star formation histories are spatially correlated. Massive objects formed a larger fraction of their stars at higher redshifts and over shorter timesca...

We derive deep luminosity functions (to Mz = −15) for galaxies in Abell 1835 (z = 0.25) and AC 114 (z = 0.31) and compare these with the local z luminosity function for 69 clusters. The data show that the faint-end upturn, the excess of galaxies above a single Schechter function at Mz < −17, does not exist in the higher redshift clusters. This suggests that the faint-end upturn galaxies have be...

In the lenticular galaxy NGC 1023 a new population of star clusters (" faint fuzzies ") was recently discovered by Larsen & Brodie. These clusters are found inside the disc and are faint (23 ≤ V ≤ 24 mag) and extended with effective radii of r eff ≈ 7 to 15 pc. We present here N-body calculations of a likely formation-scenario through merging star clusters in clusters of star clusters (super-cl...

We have scanned the fields of six radio-loud quasars using the Taurus Tunable Filter to detect redshifted [O ii]λ3727 line-emitting galaxies at redshifts 0.8 < z < 1.3. Forty-seven new emission-line galaxy (ELG) candidates are found. This number corresponds to an average space density about 100 times that found locally and, at L([O ii]) < 10 erg s cm, is 2 − 5 times greater than the field ELG d...

The nature of the starburst phenomenon in galaxies is investigated using a narrow band color system designed to study color evolution in distant clusters. Work on zero redshift, luminous far-IR galaxies, calibrated by starburst models, demonstrates the usefulness of this color system in isolating starburst from normal star-forming colors, and also demonstrates a strong correlation with far-IR c...

We present a principal component analysis of galaxy spectra from the CNOC sample of rich X-ray luminous clusters at 0.18 < z < 0.55. Composite radial distributions of different stellar populations show strong gradients as a function of cluster-centric redshift. The composite population is dominated by evolved populations in the core, and gradually changes to one which is similar to coeval field...

We present the results of a wide-field survey for H -emitting galaxies in the cluster AC 114 at z = 0:32. Spectra centred on H at the cluster redshift have been obtained for 586 galaxies to Itot 22 out to a radius of 2 h−1 50 Mpc. At most, only 10% of these were found to be H –emitting cluster members. These objects are predominantly blue and of late-type spiral morphology, consistent with them...

We present optical spectroscopy of 16 star clusters in the merging galaxies NGC 4038/39 (”The Antennae”) and supplement this dataset with HST imaging. The age and metallicity of each cluster is derived through a comparison between the observed Balmer and metal line strengths with simple stellar population models. We then estimate extinctions and masses using the photometry. We find that all but...

The building blocks of galaxies are star clusters. These form with low-star formation efficiencies and, consequently, loose a large part of their stars that expand outwards once the residual gas is expelled by the action of the massive stars. Massive star clusters may thus add kinematically hot components to galactic field populations. This kinematical imprint on the stellar distribution functi...