alma cycle 2 capability
DESCRIPTION
ALMA Cycle 2 Capability. Jongsoo Kim ALMA EA Korea node. Locations of ALMA and GMT. ALMA. GMT. Antennas. 50x12m-Array + 12x7m-Array + 4 12m-TP Array Longest baseline: 16 km Current: 66 delivered Completed in 2013(?). Resolution and Sensitivity Comparison. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/1.jpg)
ALMA Cycle 2 Capability
Jongsoo KimALMA EA Korea node
![Page 2: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/2.jpg)
Locations of ALMA and GMT
ALMA
GMT
![Page 3: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/3.jpg)
Antennas50x12m-Array + 12x7m-Array + 4 12m-TP ArrayLongest baseline: 16 kmCurrent: 66 deliveredCompleted in 2013(?)
![Page 4: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/4.jpg)
Resolution and Sensitivity Comparison
![Page 5: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/5.jpg)
ALMAAtacama Large Millimeter/Submillimeter Array
![Page 6: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/6.jpg)
C2: Antennas
• 34 12m-Array• ACA Array: complement to 12m-Array
– 9 7m-Array• Shorter baselines• No WVR (Water Vapor Radiometer)
– 2 12-m TP Array• Single dish observations• Spectral line (no continuum) observations in Band 3-8
(no 9)
![Page 7: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/7.jpg)
Atmospheric Transparency
![Page 8: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/8.jpg)
C2: Receivers
• B2,4,6,7: 1.5km, B8,9: 1km• B2,4,6,7,8,9: dual pol, XX,YY
![Page 9: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/9.jpg)
7-m, 12-m Array Configurations
7 configurations Most compact confi. with
max baseline 160m Most extended conf. with
max baselines, 1.5km for B3,4,6,7, 1.0km for B8,9
![Page 10: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/10.jpg)
12-m Array configurations
min22.1LMRS
mCAR 166
2 km) (1.0 km 5.1 FAR
![Page 11: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/11.jpg)
7-m Array Configuration, TPLow elevation
mHFBW 12
6241
1813
27
7-m TP
![Page 12: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/12.jpg)
Time Estimates for mult-conf.
• Rule of thumb– estimate dt_ex, for 12-m extended configuration
(C34-4,5,6,7)– 4*dt_ex for TP– 2*dt_ex for 7-m Array– 0.5*dt_ex for 12-m compact configuration (C34-
1,2,3)• Use OT• Total time (12-m+ACA) < 100 hours
![Page 13: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/13.jpg)
Spectral Capability
Number of BBs in 2SB in each sideband: 0, 1, 2, 4Number of BBs in DSB (B9): no restric-tion
Spw in each BB: up to 4, share correlator resource among themShould have same correlator mode with a BB
Binning of data of power 2 mainly due to limitation of data rate, maximum 60MB/s, average 6MB/s
![Page 14: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/14.jpg)
Correlator mode
![Page 15: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/15.jpg)
Polarization • Single Polarization, XX: more bandwidth or more spectral
resolution• Dual Polarization XX, YY: improve sensitivity of sqrt(2)
compared with single pol case• Full polarization XX, XY, YX, YY:
– continuum obs in Band 3,6,7– LAS < 1/3 12-m primary beam, single field– Fixed frequencies
![Page 16: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/16.jpg)
Source restrictions
• “SG(Science Goal): single angular resolution, sensitivity, LAS, receiver band
• No restriction on number of SG per proposal• Total # of positions with 10 deg < 150 per SG
per array• One mosaic observing mode < 150 positions
per SG
![Page 17: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/17.jpg)
Calibration
• Absolute Amplitude calibration– Better than 5% in B 3,4– Better than 10% in B 6,7– Better than 20% in B 8,9 due to high opacity and
DSB of B9
![Page 18: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/18.jpg)
ToO
• Only 12-m array• < 2 weeks monitoring projects are unlikely
fully observed• within 2 weeks contact can not be guaranteed
![Page 19: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/19.jpg)
ALMA Partnership The Atacama Large Millimeter/submillimeter Array
(ALMA), an international astronomy facility, is a partnership of Europe, North America and East Asia in cooperation with the Republic of Chile. ALMA is funded in Europe by the Eu-ropean Organization for Astronomical Research in the Southern Hemisphere (ESO), in North America by the U.S. National Science Foundation (NSF) in cooperation with the National Research Council of Canada (NRC) and the Na-tional Science Council of Taiwan (NSC) and in East Asia by the National Institutes of Natural Sciences (NINS) of Japan in cooperation with the Academia Sinica (AS) in Taiwan.
![Page 20: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/20.jpg)
Maercker+ 2012 (Oct-11), NatureCyclo 0December 2011, data deliveredCO(J=3- 2) 345GHz1.3’’x10’’ beam50’’x50’’ map, 45-point mosaicCASA
Large Mass Loss from R Sculptoris, an AGB Star
![Page 21: ALMA Cycle 2 Capability](https://reader035.vdocument.in/reader035/viewer/2022062410/56816631550346895dd99a8c/html5/thumbnails/21.jpg)
ALMA survey of SMGs in ECDFS (Extended Chandra Deep Field South)
Hodge+ 2013, ApJ, Cycle 0ALMA band 7 (344GHz, 870mm)Primary beam: 17.3 arcsecAngular resolution: 1.5 arcsec (125m)Observed 126 subm sources detected in LESS (LABOCA ECDFS Submillimeter Survey) by 12m APEX2 minutes integration time for each source3x sensitivity 200x resolution
Resolve previously blended sources Main 99 SMGs+ supplementary 32
SMGs