alma band 5 science verification - eso · alma band 5 science verification liz humphreys, andy...
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ALMA Band 5 Science VerificationLiz Humphreys, Andy Biggs, Katharina Immer, Robert Laing, Baobab Liu, Gianni Marconi, Tony Mroczkowski, Leonardo Testi, Pavel Yagoubov, Tobia Carozzi, Simon Casey, Sabine König, Ana Lopez-Sepulcre, Matthias Maercker, Iván Martí-Vidal, Lydia Moser, Sebastien Muller, Anita Richards, Daniel Tafoya, Wouter Vlemmings, JAO EOC Team
ESO Band 5 APEX-ALMA Workshop, 1-3 February, 2017
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Overview
• Goal: verify the scientific performance of ALMA Band 5 for different target types and observing modes
• Star-formation, stars, local galaxies
• Line and continuum full polarization, response of receivers across the frequency range (spectral scan)
• In particular assess the calibration needs for observations taken close to the 183.3 GHz atmospheric absorption due to water
• Provide inputs to commission the ALMA Observing Tool and the ALMA Pipeline for Band 5 in time for Cycle 5 development
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Atmospheric transmission near 183 GHz
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Science Verification Timeline (2016)
June • Announcement of possible SV targets on the ALMA Science Portal
July to October • Data acquisition• Initial data examination, calibration and imaging at ESO
October • Band 5 Busy Week, Onsala Space Observatory, Chalmers University
• Participants from across the EU ARC Network • Intensive work on finalized data calibration & imaging
December • Finalized inputs to the OT and Pipeline• Public release of calibrated and imaged data• ESO Press Release, ALMA Band 5 “First Light”
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Science Verification Targets
Chosen partly on the basis of existingAPEX SEPIA Band 5 observations
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ALMA Band 5 Observations of Arp 220• Observations were made on 26 July 2016, during pwv ~ 0.3 mm
• 12 antennas, baseline lengths ~30 to 480 metres, beam 0.7 x 0.6"
• Data calibrated both manually and using the ALMA Pipeline
183 GHz H2O - redshifted out of worst transmission
Total Intensity Velocity Field Velocity Dispersion
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Arp 220CH3OH ?H2OHNCCS
Moment 0
Moment 1
Moment 2
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Comparison DatasetsAPEX SEPIA Band 5Galametz et al. (2016) -talk by Zhi-Yu Zhang
Scoville et al. (2015)ALMA Band 7 0.4 x 0.6”
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First ALMA Band 5 Arp 220 Paper
Konig et al. (2016, astroph)
Water masers at 22, 183 and 325 GHz
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Sgr B2 (Almost Complete) Spectral Scan
• Observed using 13 tunings across almost the whole receiver range
• Frequency resolution is 0.488 MHz
• 8 - 12 12m antennas with baselines up to 1.6 km, + 4 7m antennas for some tunings
Sgr B2N Comparison with APEX: Water Line
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183 GHz Water in Sgr B2(N)
Time on Target forWater Tuning ~ 24 min
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Comparison Dataset
APEX SEPIA Band 5Immer et al. (2016) –talk by Katharina Immer
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Complete (Almost) Spectral Scan Black: ALMAGrey: APEX
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VY CMa: Full Polarization (Spectral Line + Continuum)
• Data were taken on 26 October 2016, 15 antennas, 3 execution blocks
• Full polarization at high spectral resolution, H2O and SiO lines
Data release memo – Marti-Vidal, Vlemmings & Carozzi
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Polarization: SiO Masers Near 172.5 GHz
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Comparison Data
VY CMa“J”-shapedContinuum
HSTSW-clump
Richards et al. (2014);O’Gormann et al. (2015)
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Comparison Data
Humphreys et al., in prep
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Comparison
Richards
Talks by Anita Richards andWouter Vlemmings
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Band 5 SV Data Release
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ALMA Band 5 “First Light”
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ALMA Band 5 at Cycle 5
• See announcement on the ALMA Science Portal this week
• Band 5 proposers should use the regular Cycle 5 proposal deadline (April)
• Band 5 observations will be scheduled from 2018 March 1 onwards
• Users should verify which configurations/angular resolutions are available after this date
• The ALMA Observing Tool will not check this scheduling constraint
• According to the current configuration schedule, the longest baseline length configuration available at Cycle 5 for Band 5 is 1.1 km
• Please check the Cycle 5 Proposers Guide carefully for additional Band 5 observing constraints and information