-------------------------------------------------------------------------------------------------------------------------------------- Minutes PNS meeting - IAU Sydney, 24/07/2003 Taken by Magda and circulated by email 29/8/2003 Participants: Nigel Douglas, Ken Freeman, Konrad Kujken, Mike Merrifield, Ortwin Gerhard, Aaron Romanowsky, Nicola R. Napolitano, Magda Arnaboldi. ** Costs Halpha arm / John Hart's quote ( 24/07) : halpha arm mechanical design 15550 aus$ mechanical construction 36840 aus$ consider - 8300 aus$ for the focusser, and filter mechanism. Red broad filter could be futher up. consider -4000 aus$ for filter mechanism Total quote 40090 aus$ while old quote amounted to 32000. In the budget for the Halpha application we quote 5300 aus$ for the revision of the optical design: do we ask Gabe and Damien Jones to quote for optical design revision of the halpha arm? Ask quote for optical design at the russian company working for OAC and the VST optics. Follow-up on the quote for the dichroic coating. ** Design questions Halpha arm Optical design needs to be reviewed. Optical fabrication - company in Russia is good and quick. Probably not dichroic. In the Halpha arm we need to have 2 filters in, The R band always in while the Halpha filter flips in and out. Need to check for reflections and ghosts. Should be ok in parallel beam. Halpha arm - shutter for the off band must be quick Dimension for the shutter on the halpha arm: KK says we can mount the Marconi EEV (2kx4k) available at the WHT which has a 13 micron pixels and 0.33" pix^-1. These CCDs come with their own shutter, the question is what shutter they have and how fast they can run it without vignetting. Dicroic ==> CSIRO Roger Netterfield ( also potential supplier for [OIII] filter) can provide both the optics and coating. Camera: optics and coating. For the PNS optics, coating was done by Rofin Ask John Hart whether the addition of the halpha camera would cause flexure of the other two arms. Diacroic has priority, emphasys on the anti-reflection coating. When diacroic is put in, pupil is going to move to the left NB: now pupil is a bit shifted to the right... (to be checked!!). TODOs: KCF & MA Optical design. ask quotes to Damien and Gabe NRN: investigate with OAC for quotes about optical design ND & MA: diacroic: ask quotes for design and constructions. (Russian company, R Nettlefield for dichroic - this is time-determining factor) ** Halpha filter characteristics. Lambda_c for the current [OIII] narrow band filters is 5058 5034 5004, v=3060 1640 0 Halpha filter width has to be 15% wider than the [OIII] filter width to match the velocity range. Also with the Halpha arm we want to see HII regions, and then O3 to Halpha flux is 1, so no need to go so faint as to detect Halpha deom PNe ( from 3 to 5 times fainter). So a larger filter is actually a good compromise. Wider also for NII lines (15 A to one side, 20 to the other of Halpha) Diameter 120 - 130 mm, if we can place it further up. best lambda_c for our Halpha filter is 6598 AA with DLambda 100 AA. TODOs: KK check so that it can be made compatible with the ING WFI KCF&MA ask Damien Jones & Gabe where we could place the filter so that its diamater is smaller and can cost less/easier to construct ** Is the halpha arm funded? 9000 euros (already at Stromlo, from Univ Basel) 7000 (Groningen) 15000 euros (Nottingham) 61000 (SNF) 3000 (INAF) total : 95000 ~ 155 k aus$ YES, the halpha arm is funded! For bills: Mike must be sent a bill separately, the rest could be transferred to and paid from Basel. ** TODOS: KCF&MA follow up on the mechanical design al Mt Stromlo; most urgent: dichroic ND & NRN follow-up in groningen for the actual mechanical construction, perhaps better deal because labour cost per hour less than at Stromlo. ND: follow up on the upgrade for the electroninc box for the PNS, based on the new grant he acquired for this purpose (Congratulations!!!) Everybody: think about the specs for filter & the optical design of the halpha camera: 80% total enery in 0.4". who? quotes for lens Do we optimise for another telescope? Access visitor focus of the NTT? TODOS: KK investigate whether PNS will be welcome at the NTT as visitor instrument. Re Nigel's recent letter of intent. ** Improvements on actual PNS: new OIII filter, need to discuss lambda_c and Dlambda for new filter. TODOS: AR to circulate specs for new filter according to scientific goals, to close gap in velocity. KK: at the end of the M31 run, send John Hart instruction for the new filter holder ND: replace electronic box ** Data analysis and interpretation Data reduction pipeline: now it goes from raw data to velocities, all consists of IRAF scripts and some unix executables, mpgplot. Installed in Groningen, Nottingham. ND is nominated PI of the PNS project ( Congratulations!) to -- coordinate and manage data / data quality, -- observing management -- watch deadline for proposals -- find funds for students/travel etc -- coordinate workload across the group Science issues still to be discussed jointly. Should be consensus driven; projects/analysis proposed to the team. TODOS: need to find ways to fund science, postdocts and students. perhaps submit a proposal for an European network?? PHD students: Australia, Nottingham, Leiden, Basel (interpretation) TODOS: KCF, MM, KK get these students! ** Data sets / Papers in progress: NGC 4494, NGC 3379, NGC 4339, NGC 821 ==> round ellipticals NGC 5866 NGC 7339 4339 2549 7332 7013 Edge on S0 How many v's in each of these objects? Data products: selected PNe table of velocities. Highest priority to finalise data reduction of NGC 3379 data (AR, NRN, MA) and carry out modelling ( AR & OG), drafting long paper ( everybody). Final catalogue of sources. Identification. Bit more work on pipeline. Discuss which galaxies to observer in March/April.