Brad Whitmore

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The integration of passive components into multichip modules (MCM) provides a path for reducing the size and cost of microwave modules while minimizing interconnect parasitics. One passive component which is frequently used in transmit/receive modules of active phased array systems is the circulator. In this paper, an S-band Y-junction circulator was(More)
The Charge Transfer Efficiency (CTE) Working Group at STScI was created as a forum to study and discuss the effects of CTE loss on HST CCDs. This report is the first publication detailing our progress. It represents the Institute’s current (as of early 2001) understanding of the effects of CTE degradation due to radiation damage. We review the causes of CTE(More)
An analysis of WFPC2 observations of Omega Cen and NGC 2419 leads to the following results. 1. The correction formula developed by Whitmore, Heyer, and Casertano (1999; hereafter WHC99) does a reasonable job of correcting for CTE loss down to extremely low count levels (i.e., so faint you cannot actually see the object but only know of its existence from(More)
The throughput of the WFPC2 cameras in the UV is potentially susceptible to significant decreases as a result of contaminants deposited on the cold CCD windows, once the instrument has been cooled down to -88o C. An important part of our SMOV3B checkout involved intensive monitoring of this contamination using the F170W filter, to ensure that the throughput(More)
The distributions of size and luminosity for star-forming regions in the nearby spiral galaxy NGC 628 are studied over a wide range of scales using progressively blurred versions of an image from the Hubble Space Telescope Advanced Camera for Surveys. Four optical filters are considered for the central region, including Hα. Two filters are used for an outer(More)
We describe the Hubble Space Telescope (HST)Wide Field Camera 3 (WFC3) Early Release Science (ERS) observations in the Great Observatories Origins Deep Survey (GOODS) South field. The new WFC3 ERS data provide calibrated, drizzled mosaics in the near-UV filters F225W, F275W, and F336W, as well as in the near-IR filters F098W (Ys), F125W (J), and F160W (H)(More)
We describe here the results from an extensive series of tests and observations that we carried out with WFPC2 as part of the Observatory Verification program during March to April 2002, after SM3B. These tests included UV monitoring of possible contamination, performance checks of the biases, darks and other internal calibrations, as well as PSF and(More)
A check of the photometric throughput of the WFPC2 was performed March 31, 2002 (program ID: 8953). The standard star GRW+70d5824 was observed with a selection of filters and the standard star was centered in each of the four CCDs. The data indicate that any changes in the photometric throughputs due to SM3B are less than 1% in most of the visible(More)
We estimate the dynamical masses of several young (≈ 10 Myr) massive star clusters in two interacting galaxies, NGC 4038/4039 (”The Antennae”) and NGC 1487, under the assumption of virial equilibrium. These are compared with photometric mass estimates from K-band photometry and assuming a standard Kroupa IMF. The clusters were selected to have near-infrared(More)