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101. Minutes of the First EALFA Consortium Workshop
... The minutes reflect as closely as possible what actually happened, but because they have been produced from written notes of the proceedings, they are intended to provide a summary, not a transcript. ... German Cortes (on telecon from Ithaca) and Desh Desphande (NAIC) . PDF . ... HTML PDF PPT . ... Galactic ALFA Surveys: What might Happen in a Week . ... First results from a Pilot Fast Mapping Survey . ... HTML PDF . General Introduction and Consortium Guidelines . ... PDF PPT . ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/ealfa.html -- 8.1 Кб -- 08.05.2006
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102. Galactic ALFA Surveys
Next: Survey Simulations Up: Minutes of the 1st Previous: RFI at Arecibo . GALFA is really a consortium of 3 separate sub-consortia centered around different science topics: Galactic HI, Continuum and Recombination lines. ... Continuum survey . ... Recombination lines . 12 H lines are found in the ALFA band, from n=163 to 174. ... At the same time, you could make an L-band map of SNR in OTF mode, basketweaving scans in RA and in Dec (the HI map would require more time than the continuum data). ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/galfa.html -- 10.0 Кб -- 08.05.2006
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103. GOLDMiNe: Virgo cluster optical and HI databases
... The idea of an ALFA Virgo Survey is very excited. We should go for full coverage of the Virgo cluster, that is 800 square degrees. ... To interpret and understand the results of such a survey will require a lot of complimentary data. In Milano, we have developed the Galaxy On Line Database Milano Network or GOLDMiNe . ... This site provides on line selection of multiwavelength data for galaxies in both the Virgo cluster and the Coma supercluster. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/goldmine.html -- 5.6 Кб -- 08.05.2006
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104. General Introduction and Consortium Guidelines
... Hole in ground saved a lot of work but still huge amount of excavation. ... During the '80's, design work was done on a Gregorian feed system. ... new pointing system . ... improvements to 430 MHz system The upgrading project also required infrastructure improvement because of increased load, in particular the additiona of new cables and new cement archor blocks. ... NAIC is supported by National Center for research in Astronomy and Atmospheric Science. ... Proprietary rights Proposed Guidelines: . ...
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105. HIDEEP and HIJASS Results
Next: HIMF Up: Minutes of the 1st Previous: HIPASS . ... HIDEEP is a deep, blind survey with Parkes over a small patch of sky. ... 9000 sec per beam . ... HIDEEP optical follow up: . ... HIDEEP galaxy properties: . ... HI column densities: . ... To figure out the actual HIDEEP sensitivity, you have to decide how to derive the limits on the column density when the beam is large (unresolved sources). ... In terms of your column density, you are assuming filled beam and then adopting an optical size. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/hideep.html -- 8.4 Кб -- 08.05.2006
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106. HI Mass Function
... I note that "Z" plays an important role in what the ALFA surveys will look for: . ... low Z . nearby low mass . ... Arecibo . ... ADBS (Arecibo Dual Beam Survey): Rosenberg & Schneider 2002. ... A few sources with unobvious optical counterparts. ... Coverage wins for volume, but if you do a shallow survey you are sampling only the nearby volume at low masses. ... So need artificial test sources to find completeness. ... Total volume within survey in which source could have been detected. ...
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107. HIPASS Results and Lessons
... HIPASS results . ... Of the BGC galaxies, 138 have redshifts for the first time. ... We really need ALFA to address that faint end. ... This estimate accounts for the smaller beam size, the number of pixels, and the available solid angle. ... HIPASS (with an integration time of 250 sec per pixel) was complete only for M * galaxies at cz ALFA (with the same intergration time) would be complete to 15,000 km/s . ... The integration time would be only 1 sec per beam for a total time of about 2.6 hours. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/hipass.html -- 12.0 Кб -- 08.05.2006
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108. Using the Parkes Multibeam to search for HVC Analogs
Next: Sunday pm #1 Up: Minutes of the 1st Previous: HVCs . ... Blitz et al. (1999) and Braun Burton (1999) have suggested that some HVCs have median distances of 500 kpc to 1 Mpc and HI masses of 10 6 - 7 solar masses. ... Simulations of galaxy formation, e.g. Klypin et al. (1999), predict large numbers of satellites in Local Group analogs. ... Detections were identified by searching by eye cuts through the cubes. ... Consider a comparison of the Parkes Multibeam with ALFA: . ... Parkes MB . ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/hvcanalog.html -- 7.8 Кб -- 08.05.2006
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109. The Search for HVCs in Other Galaxies
... Are HVCs a common feature of star forming galaxies? ... Consider the typical properties of the smallest HVCs (compact HVCs) found in HIPASS: . Distance . HI Mass . ... At 5 kpc . meager objects ~116 solar masses . ... 1.15 x 10 4 solar masses . ... Putman et al. (2003) found none to 10 7 solar masses. 2% of Sculptor to 3 x 10 6 solar masses by de Blok et al. (2001) found none. ... High velocity gas around other galaxies can be identified from maps and dynamics: . ... 2003) . ...
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110. ALFA IF/LO System
... This talk will cover everything inside the dewar and everything downstairs to the backend. ... Standard 300 MHz centered at 1.275 GHz. ... 14 couplers provide calibration . ... There will be a RFI out-of-band bandpass filter. ... Approximate for backends: -10 to -5 dBm over 300 MH, 150-450 MHz. Bob B. To deal with narrow band RFI from, e.g., radars, what possibilities are there for using notched filters? ... What about putting in a filter to block the range below 1300 MHz. ...
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111. Ionization and the Detection of Low HI Mass Galaxies
... In this talk, I will discuss a study of the effect of ionization on the low end of HI mass function. The existence of a large population of low mass galaxies follows from CDM theory. ... HIDEEP found no low HI column density galaxies. One possible explanation is that the disks are "frozen". ... We assume that galaxies are exposed to an ionizing background radiation, from a uniform quasar distribution. ... We find a gap in the average column densities around N H which drops to 10 17 cm -2 . ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/ioniz.html -- 6.2 Кб -- 08.05.2006
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112. Searching the Environment around LyAlpha Absorbers
... This talk focuses on exploring the connection between Ly absorbers and galaxies. The theorist view of gas in the low z universe is based on the filamentary structures that are evident in simulations based on the CDM paradigm. ... The observer's view of gas in the low-z universe is based on the Ly absorbers which have column densities as low as 10 cm , while galaxies are at column densities of 10 cm . ... The absorber has N cm . ... Can examine LSS defined by gas-rich galaxies around absorbers. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/lyalpha.html -- 9.9 Кб -- 08.05.2006
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113. Monday Afternoon Discussion
Up: Minutes of the 1st Previous: Monday am . Karen O. Let's start by going on with what Bob Brown suggested this morning. ... Meeting minutes . ... possibly add representatives to parallel surveys to science strategies . ... Martha . ... Riccardo . ... Steve . ... Martha, Steve, Jon, Erwin . ... Karen O., Martha & Alison . ... Steve In the end, it was noted that Karen O., Riccardo and Steve were all close to NAIC, so there should be no distinction among them for the 2 US candidates. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/monaft.html -- 14.2 Кб -- 08.05.2006
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114. Monday Morning Discussion
... We all agree there are a number of very exciting EALFA surveys: . ... ZOA We agree on various ones, but they have different needs and may not be of equal interest to everyone. ... Perhaps ALFALFA doesn't need to survey below 1350. ... Individuals were proposed to lead the discussion of survey needs in 5 categories: . ... NAIC needs to understand how the surveys will function, but also the community needs to understand what they are committing themselves to and what NAIC expects of the teams. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/monmorn.html -- 38.5 Кб -- 08.05.2006
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115. ALFA Front End Optics
Next: Front End Construction Up: Minutes of the 1st Previous: Minutes of the 1st . ... Calculated system temperature: 25-26K at 1525 MHz, 29-30K at 1375 MHz and 34-25K at 1225 MHz. ... Calculated G/T - again, center pixel better . ... Multi Beam Sky Footprint: Separation 2 beam widths between individual beams . ... Calculated Beam Comatic Level about 8 dB . ... German . ... Slide 1.9 shows calculated T sys with 2 points for each frequency; one is for the center beam and other is for the outside. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/optics.html -- 9.7 Кб -- 08.05.2006
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116. Pulsar ALFA Surveys
... The pulsar consortium met on 1-2 November 2002 in Arecibo. ... Preliminary parameters for the pulsar surveys will produce on the order of 1 Pbyte of raw data over the course of 3-5 years. ... Young canonical pulsars (galactic plane) . ... The Parkes Multibeam Pulsar Survey adopted an integration time of 2100 sec. Surveys with ALFA need only 20 sec to match this sensitivity, but we want 300 sec to go much deeper. ... For pulsar surveys, we require the following in a spectrometer: . ... Jim . ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/palfa.html -- 15.0 Кб -- 08.05.2006
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117. RFI Issues at AO
... See also the NAIC spectrum management page. Note that the full ALFA band covers 1225 to 1525 MHz. ... An example was shown of the OH spectrum of an OH/IR star obtained with 3-level sampling using the present autocorrelator showing lots of ringing. ... But also, we need simple RFI removal software. ... This also relates to the issue of maximum BW: 100 or 200 MHz bandwidth? From my experience, the spectrum seems to be pretty clean out to 1225 MHz, and so there is a case for 200 MHz bandwidth. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/rfi.html -- 10.4 Кб -- 08.05.2006
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118. Simulations of 3 ALFA Surveys
Next: Pilot Survey Up: Minutes of the 1st Previous: GALFA Surveys . ... The minimum integration time required to achieve a given mass sensitivity scales as distance to 4th power so the depth of survey increases only as t int to the 1/4. ... To predict what ALFA might see for several surveys, I have performed a set of simulations governed by the following: . ... ZOA survey: Assuming integration time of 300 sec, covering 10 (more than pulsar survey suggested), within the AO limits . ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/simulations.html -- 9.5 Кб -- 08.05.2006
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119. The SMUDGES Survey
... This survey will using the 3.5 and 0.9m telescopes of the WIYN Observatory to conduct an unbiased survey for dwarf galaxies. ... What percentage of low mass galaxies experience starburst (SB) episodes? ... There are two kinds of galaxies, those that SB and those that don't. Need a survey that identifies both kinds? ... Therefore, you need to survey a large area to have a sufficient volume to find enough dwarfs. ... Low mass galaxies are very rare, so we need to cover a lot of area. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/smudges.html -- 7.8 Кб -- 08.05.2006
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120. Sunday Afternoon Discussion
Next: Sunday pm. ... If you can expand the WAPPs to 200 MHz, you get same thing . ... Riccardo . ... And, we need to define the data products that will make ALFA surveys a major legacy for the Arecibo Observatory. ... Rather, these surveys constitute a major telecope time investment. ... Once you start integrating for a long time per point, the total survey time per given sampled volume becomes large. ... OK, there seems to be consensus on the need for both a shallow survey and a deep survey. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/alfa/ealfa/meeting1/minutes/sunaft1.html -- 21.7 Кб -- 08.05.2006
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