The ngVLA Memo Series

A series of technical and scientific memos related to the ngVLA are continually being published in the ngVLA memo series. 

Memos may be submitted by anyone in the community and represent the opinions of the author(s). While many ideas expressed in the memo series are subsequently adopted into the design, publication of a memo does not constitute project concurrence with the findings. For the approved and evolving project baseline, please reference the Project Design documentation.

General Memos
Technical Memos (Antenna)
Technical Memos (Electronic)
Computing Memo
ngVLA-J Memos (ngVLA-Japan Memo Series)


General Memos

Memo Number Title Author(s) Date
1 Fast Switching Phase Calibration At 3mm at the VLA Site C. L. Carilli 06/01/15
2 Calibration Strategies for the Next Generation VLA B. Clark 07/16/15
3 Possible Configurations for the ngVLA B. Clark, W. Brisken 07/31/15
4 The Concept of a Reference Array for ngVLA F. Owen 09/03/15
5 Science Working Groups Project Overview C. L. Carilli, et al. 10/23/15
6 Science Working Group 1: The Cradle of Life A. Isella, et al. 10/23/15
7 Science Working Group 2: "Galaxy Ecosystems" : The Matter Cycle in and Around Galaxies A. K. Leroy, et al. 10/23/15
8 Science Working Group 3: Galaxy Assembly through Cosmic Time C. M. Casey, et al. 10/23/15
9 Science Working Group 4: Time Domain, Fundamental Physics, and Cosmology G. C. Bower, et al. 10/23/15
10 Considerations for a Water Vapor Radiometer System B. Clark 12/08/15
11 Imaging Capabilites: Protoplanetary Disks Comparison of ngVLA, JVLA, ALMA C. L. Carilli, L. Ricci, P. Barge, B. Clark 04/08/16
12 The Strength of the Core C. L. Carilli 10/14/16
13 Image Capabilities: High Redshift CO C. L. Carilli, Y. Shao 03/13/17
14 Short Spacing Considerations for the ngVLA D. T. Frayer 06/08/17
15 Galaxies into the Dark Ages C. L. Carilli, E.J. Murphy, A. Ferrara, P. Dayal 06/08/17
16 More on Synthesized Beams and Sensitivity C. L. Carilli 06/19/17
17 ngVLA Reference Design Development & Performance Estimates R. Selina, E. Murphy 07/18/17
18 Summary of the Science Use Case Analysis R. Selina, E. Murphy, A. Erickson 07/26/17
19 Key Science Goals for the Next Generation Very Large Array (ngVLA): Report from the ngVLA Science Advisory Council ngVLA Science Advisory Council 08/02/17
20 Next Generation Low Band Observatory: A Community Study Exploring Low Frequency Options for ngVLA G. Taylor, et al. 08/11/17
21 ngVLA Sensitivity B. Butler, W. Grammer, R. Selina, E. Murphy, C. Carilli 06/26/19
22 Sub-Nanosecond Time Accuracy and Frequency Distribution through White Rabbit Ethernet C. van Tour, J. C. J. Koelemeij 09/04/17
23 Smart Energy Cryo-Refrigerator Technology for the Next Generation Very Large Array J. Gardiner, et al. 09/01/17
24 Advanced Cryocoolers For Next Generation VLA L. R. D'Addario 09/29/17
25 Exploration of Suitable Mounts for a 15m Offset Antenna Next Generation Very Large Array NRC 15m Mount M. Fleming 10/23/17
26 ngVLA Technical Study Offset Gregorian Antenna D. Chalmers, G. Lacey, M. Islam, M. Fleming, L. Baker 10/23/17
27 Various Suitable Mounts for an 18m Antenna M. Fleming, R. Schultz, D. Enterline 10/30/17
28 Host Galaxies and Relativistic Ejecta of Compact Binary Mergers in the ngVLA Era A. Corsi, et al. 10/31/17
29 An Integrated Receiver Concept for the ngVLA M. Morgan, S. Wunduke 11/06/17
30 ngVLA Dynamic Range W. D. Cotton, J. J. Condon 11/07/17
31 Quantifying the ngVLA's Contribution to Exo-Space Weather: Results of a Community Studies Report R. A. Osten, M. K. Crosley 11/13/17
32 ngVLA Community Studies Report: Feed and Receiver Development at NRC Herzberg L. Locke, L. B. G. Knee, F. Jiang, V. Reshetov, L. A. Baker 11/14/17
33 Investigating the Early Evolution of Planetary Systems with ALMA and the Next Generation Very Large Array L. Ricci, S.-F. Liu, A. Isella, H. Li 1/5/18
34 A Dedicated Pulsar Timing Array Telescope (a.k.a. "Pulsar Town") Robert Selina, Paul Demorest, Wes Grammer 05/15/18
35 Deep Fields at 8GHz C. L. Carilli, G. C. Jones, P. Sims 2/16/18
36 High-Power, High-Speed Photodiodes Joe C. Campbell 3/5/18
37 Intermediate-Mass Black Holes in Globular Cluster Systems J. M. Wrobel, J. C. A. Miller-Jones, K. E. Nyland, T. J. Maccarone 3/9/18
38 Subarray Processing for Projection-Based RFI Mitigation in Radio Astronomical Interferometers M. C. Burnett, B. D. Jeffs, R. A. Black, K. F. Warnick 3/12/18
39 Thoughts on Transient Discovery Vikram Ravi 3/15/18
40 Revolutionizing Our Understanding of AGN Feedback and its Importance to Galaxy Evolution in the Era of the Next Generation Very Large Array K. Nyland, et al.  3/15/18
41 Initial Imaging Tests of the Spiral Configuration C. L. Carilli, A. Erickson 3/21/18
42 Pulsar Timing Array Requirements for the ngVLA S. Chatterjee, NANOGrav Collaboration 04/02/18
43 The ngVLA Short Baseline Array  B. S. Mason, R. Selina, A. Erickson, E. Murphy 04/18/18
44 Confusion Limited Surveys with the ngVLA Spiral W. D. Cotton, J. J. Condon 04/13/18
45 Polarization Calibration with Linearly Polarized Feeds Barry Clark 04/19/18
46 Ionized Gas in Globular Cluster Systems J. M. Wrobel, K. E. Johnson 05/01/18
47 Resolution and Sensitivity of ngVLA-RevB C. L. Carilli 05/23/18
48 ngVLA Radio Frequency Interference Forecast A. Erickson 07/01/18
49 Snapshot UV Coverage of the ngVLA: An Alternate Configuration R. Craig Walker 07/05/18
50 Imaging Cold Gas to 1 kpc Scales in High-Redshift Galaxies with the ngVLA Caitlin M. Casey, Desika Narayanan, Chris Carilli, Jaclyn Champagne, Chao-Ling Hung, Romeel Davé, Roberto Decarli, Eric J. Murphy, Gergo Popping, Dominik Riechers, Rachel S. Somerville, Fabian Walter 08/24/18
51 Taking a Census of Supermassive Binary Black Holes Karishma Bansal & Greg Taylor 10/05/18
52 The 2018 Eruption of Nova V392 Per: A Case Study of the Need for ngVLA Justin D. Linford, Joe S. Bright, Laura Chomiuk, Alexander J. van der Horst, & Rob P. Fender 11/20/18
53 Revealing the Galactic Population of Black Holes with the ngVLA Thomas J. Maccarone, Laura Chomiuk, Jay Strader, James Miller-Jones, Greg Sivakoff 11/26/18
54 Short Spacing Issues for Mapping Extended Emission: Milky Way Case Study J. A. Turner, P. Teuben, D. A. Dale 01/09/19
55 Taperability Study for the ngVLA and Performance Estimates Viviana Rosero 01/31/19
56 Radio Frequency Interference Cancellation, Appraisal, Detection, and Correction M. J. Lambert, B. Jeffs 02/01/19
57 Imaging the Distribution of Solids in Planet-Forming Disks Undergoing Hydrodynamical Instabilities with the Next Generation Very Large Array L. Ricci, M. Flock, D. Blanco, W. Lyra 02/05/19
58 μas Astrometry with the ngVLA Carl Melis 03/01/19
59 QAC: Quick Array Combinations with CASA P. Teuben 03/25/19
60 Image Dynamic Range Limits Arising from Visibility Errors C. A. Hales 02/21/19
61 Temporal and Spatial Tropospheric Phase Fluctuations at the VLA (and Beyond) and Implications for Phase Calibration C. A. Hales 03/07/19
62 Reserved    
63 Reserved    
64 High Dynamic Range Imaging C. L. Carilli 04/29/19
65 Sculpting of the Synthesized Beam and Image Fidelity Study of KSG 1: Imaging of Protoplanetary Disks V. Rosero 05/17/19
66 Exploring Regularized Maximum Likelihood Reconstruction for Stellar Imaging with the ngVLA   (Supplemental Material)  K. Akiyama & L. D. Matthews 09/30/19
67 Demonstration & Analysis of ngVLA core + Short Baseline Array Extended Structure Imaging (V2) B. Mason 1/08/21
68 Imaging the Dusty Substructures Due to Terrestrial Planets in Planet-forming Disks with the Next Generation Very Large Array S. K. Harter, L. Ricci, S. Zhang, Z. Zhu 11/12/19
69 Remote Service Station Study K. Renda, M. Luce, A. Erickson 12/06/19
70 RFI Mitigation for the ngVLA : A Cost-Benefit Analysis Urvashi Rau, Rob Selina, Alan Erickson 12/10/19
71 RFI Mitigation in the ngVLA System Architecture Rob Selina, Urvashi Rau, Rafael Hiriart, Alan Erickson 02/06/20
72 A Study of ngVLA Subarray Efficiency: Plains + Fractions of the Core V. Rosero 01/15/20
73 Preliminary ngVLA Observing Band Availability Estimate Bryan J. Butler 01/31/20
74 Channel Weights for the VLA CWVRs Bryan J. Butler 04/20/20
75 Image Corruption From Antenna Pointing Errors: Simulation Results (and Useful Teaching Tool) Christopher A. Hales 04/24/20
76 Subarray Selection for the Reference Observing Program Viviana Rosero 06/01/20
77 Fast Transients with the ngVLA C.L. Carilli, K. P. Mooley, E. Jiménez-Andrade, E. Murphy 06/09/20
78 High Resolution, Wide Field, Narrow Band, Snapshot Imaging C. L. Carilli, E. Murphy, V. Rosero, K. Mooley, E. Jiménez-Andrade, K. Golap, B. Butler 06/15/20
79 Synthesis of Optimal Estimators for Water Vapor Radiometry N. Towne 06/17/20
80 Quasar Wind SZ imaging with the ngVLA C. L. Carilli, M. Lacy. B. Mason, A. Chakraborty, S. Chatterjee 07/08/20
81 VLA Limits on Intermediate-Mass Black Holes in 19 Massive Globular Clusters J. M. Wrobel, K. E. Nyland 07/23/20
82 Configuration: Reference Design RevC.01 Description C. Carilli, J. Carilli, A. Erickson, E. Murphy, B. Mason, V. Rosero, B. Butler 08/28/20
83 Imaging Cold Gas in High-Redshift Galaxies with the ngVLA Desika Narayanan, Eric F. Jiménez-Andrade, Eric Murphy, Qi Li, Viviana Rosero 09/17/20
84 The NGVLA Long Baseline Array: Configuration Suggestions R. Craig Walker 10/04/20
85 Comparison of Alternative Configurations for the ngVLA Plains Subarray  Addendum V. Rosero, J. Carilli, C. Carilli, B. Mason 10/20/20
86 Imaging Evaluation of Two Mid Configurations C. L. Carilli, R. C. Walker, B. S. Mason, J. P. Carilli 02/19/21
87 Accessing Intermediate-Mass Black Holes in 728 Globular Star Clusters in NGC4472  J. M. Wrobel, T. J. Maccarone, J. C. A. Miller-Jones, and K. E. Nyland 05/04/21
88 Testing Photoevaporation and MHD Disk Wind Models Through Future High-Angular Resolution Radio Observations: the Case of TW Hydrae Luca Ricci, Sarah K. Harter, Barbara 04/09/21
89 Image Fidelity Study of KSG 3 (NGA8): Imaging Molecular Gas in Nearby Galaxies  Viviana Rosero 06/24/21
90 Astrometric Constraints on a Massive Black Hole Binary in NGC4472 J. M. Wrobel, T. J. W. Lazio 06/15/21
91 Status of the VLA CWVRs Bryan J. Butler 07/19/21
92 Configuration: Reference Design Rev D Description C. Carilli, B. Mason, V. Rosero, B. Butler, J. Carilli, E. Murphy, R.C. Walker 10/28/21
93 Reserved    
94 Reserved    
95 Evaluation of the Revision D array configuration for stellar imaging Catherine Petretti, Kazunori Akiyama, and Lynn D. Matthews 10/04/21
96 ngVLA Antenna Noise Temperature Calculation Bryan J. Butler, Wes Grammer, Robert Lehmensiek 10/18/21

Computing Memos

Title Author(s) Date
1 Efficient Software Testing and Deployment for the ngVLA P. Brandt 03/27/20
2 Computing M&C Protocol Trade Study P. Brandt, R. Hiriart, R. Amestica 08/04/21
3 Software Requirements for RFI Management R. Amestica, R. Hiriart, P. Brandt 08/04/21
4 Size-of-Computing Estimates for ngVLA Synthesis Imaging S. Bhatnagar, R. Hiriart, M. Pokorny 08/10/21
5 High Performance Gridding M. Pokorny 08/31/21
6 Designing an ngVLA Dynamic Scheduler P. Brandt 09/13/21