Hien D. Tran

TL;DR: The morphology-density relation (MDR) and morphology-radius relation (MRR) for galaxies in seven z ~ 1 clusters that have been observed with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope were measured in this article.

TL;DR: SN 1991T was a peculiar object whose premaximum optical spectrum did not resemble that of any known supernova; it appears to have been dominated by lines of iron-group elements.

TL;DR: In this paper, the results of an extensive imaging and spectroscopic survey in the GOODS-North field completed using DEIMOS on the Keck II telescope are reported, including photometric and astrometric measurements for all targets detected in the R-band imaging survey of the GOODS-north region.

TL;DR: In this article, a flexible light deflection field was constructed to predict the appearance and positions of counterimages of the largest known gravitational lens, A1689, and the model was refined as new counterimages were identified and incorporated to improve the model, yielding a total of 106 images of 30 multiply lensed background galaxies.

TL;DR: In this paper, the authors presented high-resolution R-band images of the central regions of 67 early-type galaxies obtained with the Wide Field and Planetary Camera 2 (WFPC2) aboard the Hubble Space Telescope (HST).