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RAS Home :: Customer Testimonials University of Tasmania, Australia A NOTE OF PRAISE FOR THE OPERATION FROM WELL RESPECTED AUSTRALIAN RESEARCHERS! 14m Radio Telescope and 64m at Parkes "Hi Carl [RAS Lead Design Engineer], I have some good news for you. We recently took the receiver you built for us and the rest of our gear to Hobart, Tasmania, Australia. We installed our complete system on the University of Tasmania 14m Radio Telescope. We attempted interferometry between the 14m and a 26m system they have on the same site some 150m away. We were successful!. Our first target was Taurus (Crab nebula) which is very bright at approx. 900 Jy. We then tried 15 and finally 5 Jy sources and acheived fringes in both cases, admittedly very weak in the case of the 5 Jy source. This is excellent news. Our next step is to try between a 6m dish back here in Auckland NZ and the 64m at Parkes in Australia. The combined area of these is approx. same as the 14 and 26m dishes at Hobart so we are hopeful of a positive result. I had a chance to test the receiver for coherence / freq. stability against the Hobart Hydrogen maser, it performed impeccably when fed from our Rubidium freq. standard. Your circuitry is very stable." IUCAA, India Dear Mr. Lichtman, Greetings! So far I have interacted with you only as a `customer'. But, here is something different; I am enclosing for you and friends at RAS a few observations and plots that we have obtained with `SPECTRA-CYBER'. These were done with a 4-mt dish antenna located at the GMRT (Giant Meter Wave Radio Telescope) observatory near Pune. The first plot is for the Sun (easy!) and the next two are 21cm observations for the Orion and the Casssiopia region of Milky Way. You can see the feedhorn mounted on the 4-mt dish in the next picture. Some engineering and science students did these observations as part of their project work. Some or other students are always working with the 21cm receiver and the dish. These observations were very nice indeed. We are quite impressed with the superb performance of the RAS equipment and in particular with the 1420 MHz LNAs. We tested these in our radio lab and got quite impressive response. Congratulations to you and the talented electronics team of RAS!. We are going to use all these equipment for a radio-astronomy lab that we are setting up in IUCAA. This lab will be used to train and motivate bright students and teachers, conveying the beauty and excitment of radio astronomy and creating talented radio astronomers in India who will use GMRT to its full capability. OK, bye for now and with warm regards. Awaiting your valued equipment. Best wishes, Joydeep Bagchi VLA/NRAO Jeff, I am going to replace all of the NRAO designed P-Band amplifiers in the antennas with your amplifiers. Sincerely, Chuck Kutz, VLA/NRAO Research Proposal for Dark Matter Detection WITH THE RAS SPECTRACYBER™ by Rodney Howe ( ahowe@frii.com ) Professional astronomers do not have time to do drift scans at 1420.405 MHz (with perhaps the exception of Arecibo). It may also be that highly focused beam widths done by VLA and Arecibo at this frequency cause astronomers to overlook large quantities of HI clouds that inhabit the outer arms of our galaxy. There have been galactic surveys at 1420.405MHz of the HI clouds at narrow beam widths, but perhaps there needs to be a large beam width (0.7 to 1 degree) spectral Doppler survey of the HI clouds. The spectrometer shows velocities of these clouds in the outer arms to vary considerably with respect to the Local Standard of Rest for our solar system. Spiral arms in the direction of Cygnus are coming toward us (and/or we're going toward them) at velocities in excess of 150km per second. Clouds at the galactic center move very little either toward or away from us. It is likely that toward the center there is much less HI gas and more visible matter (stars) but toward the extremities of the Milky Way there is much more HI (dark matter) and fewer visible stars. If there were 'dark matter' in the outer arms of our Milky Way, it might satisfy professional astronomer's reasoning why stars in the outer arms have not flown off into intergalactic space. It seems the only way the outer arms can be moving as fast as they are, and still remain part of the galaxy, is if there is dark matter (non visible mass) holding everything together. There are more HI clouds looking toward the outer arms than looking toward the galactic center (spectral line broadening). The hypothesis might be that because we are located in the second/third spiral arm, and given that there are more HI clouds toward the galactic extremities, it may be that the HI clouds represent a form of 'dark matter' in the Milky Way. One way we might test this hypothesis is to measure the area under the 'spectral curve' as we do drift scans of the inner and outer galactic arms. Data from the center of the galaxy show a narrow peak of unmoving HI clouds. This may represent less dark matter toward the center of the galaxy as well as our general motion neither toward nor away from the center. Whereas data from the outer arms show a relative motion toward us, as well as a broader spectral curve, since we're looking through multiple galactic arms. http://www.anzwers.org/free/universe/galaxy.html Rodney Howe, DSES MICHAEL SIMPSON OF WEBER UNIVERSITY 8 May 2007 Attn: Jeffrey M. Lichtman, Good Afternoon Jeff, I apologize for not getting back with you in a timely manner. I just completed a grueling spring semester with many outstanding outcomes. I made you a disk about the WSU (Weber State University) RA system. Because of you, I received a lot great kudos, a scholarship, a chance to be nominated in the McNair Program and the National Radio Astronomy Observatory. I really appreciate the outstanding professionalism and dedication you and Carl Lyster have bestowed on me. Thank you once again! Sincerely, Michael Simpson Weber University, Ogden, UT

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