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Demonstration of Science Observing Modes

This document outlines a comprehensive plan for demonstrating laser guide star adaptive optics (LGS-AO) observing modes during the December 5, 2003, AOWG meeting, led by D. Le Mignant and A. Bouchez of the Keck AO team. The goal is to share accurate performance data and highlight the risks associated with different observing modes. It includes classifications of low, moderate, and high-risk modes, as well as proposed strategies for 2004A. The document emphasizes collaboration with the astronomy community and ensuring a balanced approach to shared-risk science, along with performance commitments by February 2004.

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Demonstration of Science Observing Modes

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  1. Demonstration of Science Observing Modes AOWG meetingDec. 5, 2003D. Le Mignant,A. Bouchez for the Keck AO team

  2. Purpose: to demonstrate LGS-AO observing modes and disseminate accurate information on the performance of the system. We are • Proposing a plan to demonstrate LGS-AO observing modes • Proposing a path to shared risk science observations in 2004B. • Soliciting and welcoming suggestions and ideas

  3. Science observing mode demonstration plan • Define most important observing modes • Focus on the observing modes for which the functionalities are in place • For these modes, engineering targets will be chosen by AO team. • Analysis of these engineering data may be done through collaborations, but tools and results should be made available to community. • Technical and performance results, techniques, and tools to be distributed to community.

  4. Risk levels • Demonstrating LGS-AO observing modes is closely related to • LGS-AO development priorities • LGS-AO characterization and performance effort Assign risk levels to various observing modes by Feb. deadline: • Low risk: demonstrated, some inefficiency. • Moderate risk: Functionalities in place, not yet demonstrated. • High risk: Functionalities not yet in place or pushing performance limits.

  5. Main criteriaand risk levels expected in Feb. 2004 • Low risk • TT star V < 16 • Dither with laser on optical axis • TT star < 30” from center of NIRC2 FOV • Integration up to 10 min. • Vertical Angle mode • Moderate risk • TT star V < 18 • laser kept on target during dither, throw <8” • Integration up to 20 min. • High pointing accuracy (~5-10milli-arcsec) • Position Angle mode • Elevation variation > 20deg. or fast rotating pupil • High risk • TT star V > 18 • Moving TT stars • Differential atmospheric refraction correction

  6. Example: AGN imaging and spectroscopy AGN mag. = 18.2; TT star = 16.4 @ 10 arcsec Many potential ways to observe this target.. Possible path to demonstrate both the feasibility and the performance: • closing loop on V= 16.4 star • off-axis observing with high accuracy TSS dither • PA mode with TSS dither • performance for 10min integration • TSS dither with LGS kept on target  then demonstrate the feasibility of observing an AGN using such setup and in parallel: • TT performance on extended/faint objects • on-axis observations with TSS dither while laser is kept on target

  7. Proposed strategy for 2004A (11 eng. nights) • Some fraction of each night reserved for subsystem testing, e.g. • Laser pointing. • Low-bandwidth wavefront sensor & tip-tilt sensor optimization. • LGS-AO characterization and performance • to be presented and discussed today • Observing mode demonstration • comes after sub-system testing and validation • Need backup programs for weather/laser contingency. • Could carry out observatory staff research programs. • Or, could call for NGS mini-proposals. • Web-based proposal, with very detailed list of observing parms • Service observing < 3 hours for each project • Which proposal is activated depends on conditions.

  8. LGS observing modes in 2004 B • LGS-AO engineering will continue in 04B • more functionalities/automation fed into the system • more characterization/performance • more demonstration of observing mode • Shared-risk science • We must commit to performance criteria in Feb. 2004. • Led by outside PIs, possible collaboration with LGS-AO team. • If something breaks, engineering is first priority. • How to optimize the return from shared-risk science? • Shall we decline high-risk science projects? • Shall we have NGS weather contingency proposals ranked by UC/CIT/UH TACs? • Shall we suggest a limit on the number of observing nights for both NGS and LGS in 2004B?

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