ALMA-Taiwan Status Report Yu-Nung Su (ASIAA) on behalf of - - PowerPoint PPT Presentation

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ALMA-Taiwan Status Report Yu-Nung Su (ASIAA) on behalf of - - PowerPoint PPT Presentation

Sep 17, 2022 208 likes •448 views

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

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SLIDE 1

ALMA-Taiwan Status Report

Yu-Nung Su (ASIAA)

  • n behalf of ALMA-Taiwan

ALMA/45m/ASTE Users Meeting December 26 - 27, 2018

Photo Credit: Wei-Hao Wang

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SLIDE 2

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
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SLIDE 3

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)

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SLIDE 4

Band 1 Receivers

Warm Cartridges Cold Cartridges

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SLIDE 5

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]

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SLIDE 6

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

ALMA synergy:

  • array phase-up
  • Band 10 / 11 and single-dish THz science

July 2017, GLT assembled in Thule

[slide from PM Koch]

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SLIDE 7

VLBI with the GLT: uv-coverage

[slide from Keiichi Asada]

GLT: 9,000 km baseline, corresponding to 20 µas at 345 GHz (expected size of BH shadow for M87: 40 µas)

uv coverage for M 87 with Greenland station, SMA, ALMA, SMT, LMT and IRAM 30m. The Baseline with

GL is red.

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SLIDE 8

GLT 2017/2018 Milestones

[slide from PM Koch]

Orion KL spectrum EHT VLBI rehearsal

  • 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)
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SLIDE 9

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]

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SLIDE 10

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

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SLIDE 11

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
  • n 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

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SLIDE 12

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
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SLIDE 13

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
  • r Turbulence —

which is the critical factor for the formation of stars and planetary disks?

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SLIDE 14

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

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SLIDE 15

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.

100 200 300 400

2012 2013 2014 2015 2016 2017 2018

15 18 8 6 5 1 1 341 335 236 147 97 65 19

ALL ALMA Papers TW 1st Author Papers

ALMA-Taiwan Publication Statistics

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SLIDE 16

ALMA-Taiwan Publication Statistics

  • 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

11 in ISM, Star Formation / Disks, Solar System

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SLIDE 17

ALMA-Taiwan Publication Statistics

  • 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

  • 4 belong to Galaxies / Cosmology
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SLIDE 18

Science Highlights

Chin-Fie Lee, 2017, Science Advances A Submillimeter Burst of S255IR SMA1: The Rise and Fall of Its Luminosity Flux 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

Liu et al. 2018

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SLIDE 19

Science Highlights

Unveiling a magneHzed jet from a low-mass protostar

Lee et al. 2018

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.

https://www.almaobservatory.org/en/press-release/ magnetic-fields-found-in-a-jet-from-a-baby-star/

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SLIDE 20

Science Highlights

Koch et al. 2018 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 field 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.

https://aasnova.org/2018/04/06/magnetic-fields-versus- gravity/

PolarizaHon ProperHes and MagneHc Field Structures in W51

B fields orientation

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SLIDE 21

Science Highlights

Ueda et al. 2018 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

First direct observa(onal evidence for the subsonic nature of the sloshing mo(on around a cool core Chandra ALMA

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SLIDE 22

Outreach Activities

Two ALMA related press conferences in 2018 (visit http://www.asiaa.sinica.edu.tw/news/newspaper.php)