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

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

Atmospheric transmission near 183 GHz

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”

Science Verification Targets

Chosen partly on the basis of existingAPEX SEPIA Band 5 observations

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

Arp 220CH3OH ?H2OHNCCS

Moment 0

Moment 1

Moment 2

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”

First ALMA Band 5 Arp 220 Paper

Konig et al. (2016, astroph)

Water masers at 22, 183 and 325 GHz

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

183 GHz Water in Sgr B2(N)

Time on Target forWater Tuning ~ 24 min

Comparison Dataset

APEX SEPIA Band 5Immer et al. (2016) –talk by Katharina Immer

Complete (Almost) Spectral Scan Black: ALMAGrey: APEX

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

Polarization: SiO Masers Near 172.5 GHz

Comparison Data

VY CMa“J”-shapedContinuum

HSTSW-clump

Richards et al. (2014);O’Gormann et al. (2015)

Comparison Data

Humphreys et al., in prep

Comparison

Richards

Talks by Anita Richards andWouter Vlemmings

Band 5 SV Data Release

ALMA Band 5 “First Light”

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