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: http://www.naic.edu/alfa/ealfa/meeting1/minutes/palfa.html
Дата изменения: Mon May 8 23:01:36 2006 Дата индексирования: Sun Dec 23 01:45:21 2007 Кодировка: Поисковые слова: m 87 jet |
The pulsar consortium met on 1-2 November 2002 in Arecibo. A report is available on the web as is a summary of the talks presented at the meeting. At the meeting, we appointed a coordination committee with 8 members which I chair. The Point of Contact (POC) at AO is Paulo Freire.
Preliminary parameters for the pulsar surveys will produce on the order of 1 Pbyte of raw data over the course of 3-5 years. Long term archiving is an immediate challenge.Study of such objects are of interest for numerous applications:
"search" vs. "confirmation": Historically, these are two different phases. Parkes spent as much time confirming as they did in the initial survey.
At our meeting, the pulsar consortium developed a final formal structure organizational chart with organization, coordinating committee and tasks assigned to each subcommittee.
Chair selection: JMC was elected temporarily, 2 week period afterwards process for election but no one volunteered. Further process needs to be specified; one idea is for rotating committee chairs.
Murray L. | Could you make your survey observations during the daytime? |
Jim | Probably. It largely depends on RFI. |
Don C. | Could you reduce integration time/pass? |
Jim | Yes. But at a cost of course. |
Steve S. | Could you offset half a beam? |
Jim | Yes. |
Chris S. | What the draft guidelines said was that 18 months is the current proprietary period. It was stated then that the issue needed to be discussed. |
Riccardo G. | The proprietary period at other national observatories is zero for large projects. |
Jim | The proprietary period for GRO was one year. |
Lister | Would you consider a scanning survey with telescope slowly moving. |
Jim | It depends on how slow. Is that for sampling issues? |
Lister | Yes. |
Jim | If it were slow enough. It would add more complexity to processing but we can deal with motion. |
Phil P. | 1PByte costs about 1 dollar per GB, so your archiving needs cost at least 1 million dollars. |
Jim | True. We don't need it all at once. |
Desh | The typical pipeline delay with regular proposals is 6 months from submitting proposal to getting on telescope. |
Jim | One of the issues we discussed is what happens, in the case that the raw data were available immediately, if a rogue pulsar group comes along and downloads all the data. |
Phil P. | How long would it take to download that amount of data? |
Jim | What if it could be stored locally. |
Murray | Could you expand a bit on the thinking on protection of student projects? |
Jim | Say we acquire a certain block of data and a PhD student will do follow up. We would like to insure some protection so that no other consortium member could do that project. |
Murray | But not protection of data. |
Jim | Right. |
Desh | So protection is really for the follow-up rather than for the raw data. |
Jim | In a sense yes. |
Riccardo | What is mimumum acceptable integration time for the high latitude survey? |
Jim | People have done drift scans (12 sec/beam), but they have not been all that successful. However, another very interesting option might be to look for transients even for a few seconds, especially if there were multiple passes of the same region. |