92 citations · 283 across the 8 of their papers we have counts for
8 papers
Demonstrating the Principles of Aperture Synthesis with TableTop Laboratory Exercises
J. M. Marr, A. E. E. Rogers, V. L. Fish +4
Many undergraduate radio astronomy courses are unable to give a detailed treatment of aperture synthesis due to time constraints and limited math backgrounds of students. We have t…
Multi-Frequency Optical-Depth Maps and the Case for Free-Free Absorption in Two Compact Symmetric Radio Sources: the CSO candidate J1324+4048 and the CSO J0029+3457
Jonathan M. Marr, Thomas M. Perry, James Read +2
We obtained dual-polarization VLBI observations at six frequencies of the compact symmetric object J0029+3457 and the CSO candidate J1324+4048. By comparing the three lower-frequen…
Laboratory Exercises Using the Haystack VSRT Interferometer To Teach the Basics of Aperture Synthesis
J. M. Marr, A. Pere, K. Durkota +3
We have developed a set of college level, table-top labs that can be performed with an interferometer using satellite TV electronics and compact fluorescent lamps as microwave sign…
A better presentation of Planck's radiation law
Jonathan M. Marr, Francis P. Wilkin
Introductory physics and astronomy courses commonly use Wien's displacement law to explain the colors of blackbodies, including the Sun and other stars, in terms of their temperatu…
Investigating Systematic Uncertainty and Experimental Design with Projectile Launchers
Chad Orzel, Gary Reich, Jonathan Marr
The proper choice of a measurement technique that minimizes systematic and random uncertainty is an essential part of experimental physics. These issues are difficult to teach in t…
Non-Uniform Free-Free Absorption in the GPS Radio Galaxy 0108+388
J. M. Marr, G. B. Taylor, F. Crawford
We have observed the canonical gigahertz-peaked spectrum source 0108+388 with the VLBA at a range of frequencies above and below the spectral peak. The activity that dominates the…
Kinematic Age Estimates for 4 Compact Symmetric Objects from the Pearson-Readhead Survey
G. B. Taylor, J. M. Marr, T. J. Pearson +1
Based on multi-epoch observations at 15 and 43 GHz with the Very Long Baseline Array (VLBA) we detect significant angular expansions between the two hot spots of 4 Compact Symmetri…
VLA Observations of Ultraluminous IRAS Galaxies: Active Nuclei or Starbursts?
Thomas Crawford, Jon Marr, Bruce Partridge +1
We employed the Very Large Array (VLA) of the National Radio Astronomy Observatory in C configuration to map 39 ultraluminous IRAS galaxies at 6~cm and 20~cm, at resolutions of ~ 4…