ALMA-Taiwan Status Report Yu-Nung Su (ASIAA) on behalf of ALMA-Taiwan ALMA/45m/ASTE Users Meeting December 26 - 27, 2018 Photo Credit: Wei-Hao Wang
Engineering and Developmental Projects - completed - • East-Asia Front End Integration Center 22 (out of 69) Front End Assemblies delivered by EA-FEIC • • Two Front End Service Vehicles delivered in 2011 • Nutator Development, 5 units in 2013 •
Engineering and Developmental Projects - in progress - • Band 1 Receivers (30 - 50 (52) GHz) Main contribution to ALMA-EA • in collaboration with NAOJ, NRAO, HIA, and Univ. of Chile. • Approved officially by ALMA board in mid 2016 • currently 15 receiver units assembled, integrated and tested in • Taiwan (3 prototypes, 12 pre-production units)
Band 1 Receivers Cold Cartridges Warm Cartridges
Band 1 Next Milestones • MRR (Manufacturing Readiness Review) 2019 go-ahead for full production • total: 73 units and spare parts for another 7 • • On-site AIV (assembly-integration-verification) activities with a small number of receivers / antennas • • Band-1 Science Workshop: towards end of 2019 / early 2020 science cases • CSV activities • community participation • Manufacturing: ~ 10-15 units per year, completion 2022 • [slide from PM Koch]
ALMA synergy: The GreenLand Telescope (GLT) • GLT project Main contribution to ALMA-NA • First Radio Observatory in the Arctic • GLT science • (sub-)millimeter VLBI • black-hole shadow imaging / AGNs • single-dish operation • THz science • lower frequency bands • • array phase-up • Band 10 / 11 and single-dish THz science [slide from PM Koch] July 2017, GLT assembled in Thule
VLBI with the GLT: uv-coverage uv coverage for M 87 with Greenland station, SMA, ALMA, SMT, LMT and IRAM 30m. The Baseline with GL is red. GLT: 9,000 km baseline, corresponding to 20 µas at 345 GHz (expected size of BH shadow for M87: 40 µas) [slide from Keiichi Asada]
GLT 2017/2018 Milestones commissioning started on December 1, 2017 • first astronomical light (moon continuum @ 90 GHz): Dec 25, 2017 • first spectrum, CO (2-1) on Orion KL with 230 GHz rx: Jan 10, 2018 • EHT 230 GHz VLBI dress rehearsal Jan 28, 2018 • longest ever VLBI baseline : SPT - GLT on 3C279 • GLT - ALMA baseline with fringe detection on 3C279 • April 2018: GLT successfully joins EHT 230 GHz VLBI obs. campaign • September 1, 2018: first light with 345 GHz rx (moon continuum) • Orion KL spectrum EHT VLBI rehearsal [slide from PM Koch]
High-Frequency THz Development • 1.5 THz rx development: 1-pixel rx tested, 4-pixel receiver under development, Trx • ~ 1000K (Si lens, no anti-reflecting coating) with IF bandwidth ~ 4.5 GHz • NbN superconducting ultra-thin layers and HEB mixers: focus on fabrication process and repeatability • Application: GLT, high-frequency development for ALMA and future THz facilities [slide from PM Koch]
ASIAA CASA Development Center • ASIAA CASA Development Center (ACDC) • established on 2016 August 1st. • one of main contributions to ALMA NA • in collaboration with NRAO, with the funds of the Ministry of Science and Technology (MoST) • Chin-Fei Lee is the ACDC manager Currently 5 full time staffs work for ACDC, including one software engineer • lead, two software engineers, one system manager, and one support scientist. • More information can be found from http://alma.asiaa.sinica.edu.tw/acdc_intro.php
ASIAA CASA Development Center • Technical Work Areas Development at the ACDC will be fully integrated and coordinated • with the CASA team. For the initial year, the ACDC team will augment the effort of NRAO • on the next generation CASA image viewer; CARTA (Cube Analysis and Rendering Tool for Astronomy). The new CARTA will be released soon. • The goal is to replace CASA viewer in CASA. • Kuo-Song Wang (our CARTA project scientist) is going to give a • presentation on CARTA later on
Taiwan ARC Node • established in November 2009, connecting to EA ARC and NA ARC • currently 9 ARC members • organizing workshops / tutorials on-island in Taiwan, together with universities in Taiwan • working with EA ARC for user support core functions (i.e., P2G, QA2, CS, Helpdesk, TA, AoD) • Promotion of ALMA science in East Asia EA ALMA Science Workshop 2016, March 10-12, 2017 @ • Hsinchu, Taiwan NEXT: - EA ALMA Science Workshop, 2019 in Taiwan •
Taiwan ARC Node • working with NA for enhanced functions The 2nd ALMA NA-Taiwan joint workshop in NTHU, Hsin-Chu, • Taiwan in 2018 Feb Magnetic Fields • or Turbulence — which is the critical factor for the formation of stars and planetary disks?
ALMA-Taiwan Proposal Statistics For ALMA Cycle 6, Taiwan users submitted a total of 72 proposals, of which 1 received grade A, 11 grade B, and 11 grade C. We have to improve the quality of our proposals in order to increase our competitiveness worldwide
ALMA-Taiwan Publication Statistics As of 2018 Dec 20th, the number of the ALMA papers led by researchers in Taiwan is 54. That means to date, 4.4% of ALMA publications is led by Taiwan-based/-affiliated researchers. 400 ALL ALMA Papers TW 1st Author Papers 341 335 300 236 200 147 100 97 65 19 5 6 8 18 15 1 1 0 2012 2013 2014 2015 2016 2017 2018
ALMA-Taiwan Publication Statistics 11 in ISM, Star Formation / Disks, Solar System • Comprehensive Analysis of HD 105, A Young Solar System Analog — Marshall et al. 2018, ApJ, 869, 10 • Unveiling a magnetized jet from a low-mass protostar — Lee et al. 2018, Nature Co., 9, 4636 • A Submillimeter Burst of S255IR SMA1: The Rise and Fall of Its Luminosity — Liu et al. 2018, 863, L12 • ALMA Observations of the Very Young Class 0 Protostellar System HH211-mms: A 30 au Dusty Disk with a Disk Wind Traced by SO? — Lee et al. 2018, ApJ, 863, 94 • The Distinct Evolutionary Nature of Two Class 0 Protostars in Serpens Main SMM4 — Aso et al. 2018, 863, 19 • The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk — Dong et al. 2018, ApJ, 860, 124 • A 100 au Wide Bipolar Rotating Shell Emanating from the HH 212 Protostellar Disk: A Disk Wind? — Lee et al. 2018, ApJ, 856, 14 • Polarization Properties and Magnetic Field Structures in the High-mass Star-forming Region W51 Observed with ALMA — Koch et al. 2018, ApJ, 855, 39 • ALMA Dust Polarization Observations of Two Young Edge-on Protostellar Disks — Lee et al. 2018, ApJ, 854, 56 • Probing Episodic Accretion in Very Low Luminosity Objects — Hsieh et al., 2018, ApJ, 854, 15 • ALMA Reveals Molecular Cloud N55 in the Large Magellanic Cloud as a Site of Massive Star Formation — Naslim et al. 2018, ApJ, 853, 175 Star Formation
ALMA-Taiwan Publication Statistics 4 belong to Galaxies / Cosmology • ALMA Polarimetry of Sgr A*: Probing the Accretion Flow from the Event Horizon to the Bondi Radius — Bower et al. 2018, ApJ, 868, 101 • A Cool Core Disturbed: Observational Evidence for the Coexistence of Subsonic Sloshing Gas and Stripped Shock-heated Gas around the Core of RX J1347.5–1145 — Ueda et al. 2018, 866, 48 • ALMA Astrochemical Observations of the Infrared-luminous Merger NGC 3256 — Harada et al. 2018, ApJ, 855, 49 • An ALMA view of star formation efficiency suppression in early-type galaxies after gas-rich minor mergers — van de Voort et al. 2018, MNRAS, 476, 122 •
Science Highlights A Submillimeter Burst of S255IR SMA1: The Rise and Fall of Its Luminosity Fl ux varia(on at a factor of ∼ 2 seen at the submm con(nuum and methanol maser line within a rela(vely short 2 years dura(on Chin-Fie Lee, 2017, Science Advances Liu et al. 2018
Science Highlights Unveiling a magneHzed jet from a low-mass protostar ALMA detecHon of SiO line polarizaHon in the HH 211 jet. Yellow line segments show the orientaHons of the SiO line polarizaHon in the jet, indicaHng possible helical magneHc fields in the HH 211 jet. Lee et al. 2018 https://www.almaobservatory.org/en/press-release/ magnetic-fields-found-in-a-jet-from-a-baby-star/
Science Highlights PolarizaHon ProperHes and MagneHc Field Structures in W51 B fields orientation The measurable angle ω between a B-field orienta(on and local gravity can be used to jus(fy whether B field help or hinder star forma(on Narrow channels where the B fi eld is very ineffec(ve in slowing down gravity are iden(fied. -> These magne(c channels may funnel gas toward the dense cores in free-fall (me scale. Koch et al. 2018 https://aasnova.org/2018/04/06/magnetic-fields-versus- gravity/
Science Highlights First direct observa(onal evidence for the subsonic nature of the sloshing mo(on around a cool core Chandra ALMA With analysis of Chandra X- ray and ALMA SZE images and solving the equa(on of state, a subsonic mo(on of the sloshing gas in the galaxy cluster RXJ 1347.5-1145 is es(mated Ueda et al. 2018
Outreach Activities Two ALMA related press conferences in 2018 (visit http://www.asiaa.sinica.edu.tw/news/newspaper.php)
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