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Minutes of SOC Meeting for Futures Workshop, Friday, 1st June 2007 -----------------------------------------------------------------Present: Murray Lewis (Chair), Chris Salter (Secretary), Lynn Carter, Jim Cordes, Colin Lonsdale, Snezana Stanimirovic, Ira Wasserman. Apologies: Lee Mundy, Russ Taylor. Meeting Program --------------Murray reviewed the ideas for topics received so far. Chris Carilli had noted that nothing is presently included in the white papers in respect of Arecibo's role as an SKA precursor. Jim mentioned that this topic has been well discussed in the past, and certainly in terms of pulsar and HI science the case is clear. Re-Arecibo's role in respect of collaboration with GLAST, he suggested Dave Thompson or Roger Romani be invited. After some discussion, it was agreed that Chris would write to Dave and invite him to participate. Murray noted that while NRAO's "Frontiers of Astrophysics" meeting this month has three speakers on pulsar topics, we still have no specific names. Jim replied that we need to cover gravitational wave detection using pulsar timing arrays. Good names here could be Don Backer or Scott Ransom. Also needing to be covered are transient detection, including RRATs. Maura McLaughlin would be excellent, but she will be having a second child in July and may not feel like attending. Ingrid Stairs would also be a good speaker, with a range of topics possible. Jim will follow up these possibilities. Murray wondered how "extreme systems" could be covered? Jim replied that he did not like this as a category. However, topics such as neutron star equations of state, high magnetic fields, aspects of precession, magnetars, etc. need to be in the program. He suggested Chris Thompson of CITA. Ira will approach Chris Thompson. Murray asked Ira if he felt we were missing anything? Ira replied that the question to ask here was, "What things are missing that Arecibo can impact?" Something on black hole binaries would be good, as it would be "Arecibo appropriate". Jim wondered what was happening about solar system radar? Lynn replied that in terms of asteroids it would be good to include a couple of dynamicists. Possible names that would be supportive of Arecibo could be Bill Bottke of SRI, and Derek Richardson of Maryland. Arecibo asteroid work will remain forefront for 10+ years. She enquired how many people in planetary radar would be appropriate to attend the workshop? Murray replied that 5-6 might be a good number. He will now talk with Don Campbell and come up with further names. There will be one or two white papers on this topic and Don has offered to prepare one of these. Lynn said that she would also talk to Don in respect of which other planetary radar topics would be appropriate. Murray said that a mail message from Snezana had been circulated, but probably too late to be be read by most SOC members. Snez said that she felt that Mordecai MacLow of AMNH, and Bruce Elmergreen of IBM would be good contributors. Ira suggested including some people who, while not obviously related to Arecibo observations, could get people thinking. Eanna Flannagan of Cornell talking on the gravitational-wave background would be a good example. What limits can be expected from the different approaches to this problem? In respect of cosmic strings, Joe Polchinski of Santa Barbara, or Henry Tye or Cornell would be good choices. Such speakers could stir up interest and stimulate discussion and ideas. This would be more like brainstorming, but could be useful. Ira agreed to follow up on these suggestions.


Jim felt that it would be productive to have pairs of talks on a subject. First one to give "the big picture" and review the theory of the subject, then a "nuts and bolts" talk on where Arecibo can fit in. Returning to the equation of state problem, Ira suggested Jim Lattimer of SUNY, Bennett Link of Montana, etc. (Chris did not catch the other two names given). These could address the question, "What are we trying to learn re-the equation of state of neutron star matter, and how?" They could also cover the condensed matter aspects. Snezana remarked that after each pair of talks that Jim had suggested, it would be great to have (say) 20 min for discussion. We need lots of discussion.

Murray mentioned that a document received from Carl Heiles discusses measuring magnetic fields for small beam-sized objects, likely to be shells. Carl did not say, however, what the big picture might be from this. Hence, it would be good to couple such a contribution with one from a theorist. Snezana felt that Ellen Zweibel would be the perfect person, but not Jim suggested getting somebody to attend from the Chinese FAST project. There is a huge overlap with Arecibo and hence huge benefits in such a presence. Murray thought this a good idea. Chris suggested that Di Li was the perfect person here. As well as being a long-time Arecibo user and Cornell graduate, Di is now the Project Scientist for FAST. He is presently based at JPL, so travel would be much easier. Chris offered to approach Di. Snez asked about contributed talks. Would there be an open call for these? As instructed by AUSAC, Murray has contacted the Arecibo user base in this respect. He has received three positive responses to date. Chris enquired about molecular cloud astronomy, and the associated development of future C-band arrays, etc.? Murray replied that Lee Mundy was dealing with this aspect. Murray asked Colin if he had any feedback for the meeting on VLBI? Colin said that he would like to catch up on the VLBI situation at Arecibo. Chris mentioned that Tapasi will be writing to Colin to bring him up to date on the VLBI state of play at Arecibo. Murray noted that the meeting should include a presentation on German Cortes's designs for a wideband low-frequency feed, and for a C-band array. Colin came back to the concept of noted that were an ultra-wideband Arecibo-GBT baseline would be the system. It would be sensitive to detecting photospheres in stars. down to the 1 microJy level. Arecibo as an SKA pathfinder. He VLBI system available, the world's best weak-source-detection brightness temperatures capable of It should also be able to detect AGNs

Jim wondered how we could get all this into a program, and still have ample discussion time? We need to block out the program in terms of science goals. Much of the discussion could take place in the 2nd half of the second day. Panel discussions were also a possibility. Ira felt that the program should be blocked out into pairs of talks for the different topics. These could fill the morning and afternoon of the first day, and the morning of the second day, with the final afternoon for discussions. Ira said that he liked panel discussions with provocative panelists, but knew that other people did not. Murray said that he would take a first cut at a framework program, and circulate this to the SOC. Other Issues -----------No web site yet exists, but Emmanuel Momjian returns to Arecibo this


weekend, and Murray will ask him to set up a web page. Lynn asked where the workshop would take place? Murray replied that it would be in the same location as Chicago III. This is in Cornell premises in Washington D.C. It was asked how many people were expected to attend? Murray said that provisional plans were for 40-50. Chris noted that this number had been decided on when the workshop was to be in Arecibo. We need to find out what the Washington premises will accommodate. Jim returned to the question of response from users. Murray said that positive replies had been received from Jessica Rosenberg, Joanna Rankin and Dan Stinebring. He added that Rich Barvainis of the NSF would be attending. Snez stressed the need for strong, interesting moderators for the sessions, who could "prime" the discussion. Murray noted that the white papers would be available before the workshop. Chris remembered that the Arecibo Upgrade workshop in 1986 had its proceedings published in a low-cost edition (by Cornell?) This volume still got disted down and used from time to time today! He wondered if something similar would be appropriate for the present workshop? Murray replied that this could certainly be done. Date of Next Meeting -------------------Thursday, June 14th at 3 p.m. EDT. Colin noted that he would be in Italy, but would try to call in.