R.V.U. - Research

My research interests include numerical techniques and algorithm development for image reconstruction and calibration of synthetic-aperture imaging systems, interactive data visualization, computational physics, parallel and high-performance computing.

Curriculum Vita (pdf)

GitHub

LinkedIn

ADS Publications

Journal Publications

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A Joint Deconvolution Algorithm to Combine Single-dish and Interferometer Data for Wideband Multiterm and Mosaic Imaging , Rau, U. ; Naik, N. ; Braun, T. Astronomical Journal, Volume 158, Number 1, June 2019
Direction-dependent Corrections in Polarimetric Radio Imaging. I. Characterizing the Effects of the Primary Beam on Full-Stokes Imaging , Jagannathan, P.; Bhatnagar, S.; Rau, U.; Taylor, A. R. The Astronomical Journal, Volume 154, Issue 2, article id. 56, 8 pp., August 2017
Understanding Systematic Errors Through Modeling of ALMA Primary Beams, K.Kundert,U.Rau, S.Bhatnagar, E.J.Bergin, IEEE Transactions on Antennas and Propagation, Vol 65 issue 2, pp. 644-653,Feb 2017
Automated Tuning of RFI Identification and Flagging Algorithms, Bruno J.Martins, U.Rau, Proceedings of the IEEE, Coexisting with Radio Frequency Interference, October 2016 [Refereed Proceeding Article]
"VLA and ALMA Imaging of Intense Galaxy-wide Star Formation in z 2 Galaxies" , Rujopakarn, W. Dunlop, J. S.; Rieke, G. H.; Ivison, R. J.; Cibinel, A.; Nyland, K.; Jagannathan, P.; Silverman, J. D.; Alexander, D. M.; Biggs, A. D.; Bhatnagar, S.; Ballantyne, D. R.; Dickinson, M.; Elbaz, D.; Geach, J. E.; Hayward, C. C.; Kirkpatrick, A.; McLure, R. J.; Michaowski, M. J.; Miller, N. A. Narayanan, D.; Owen, F. N.; Pannella, M.; Papovich, C.; Pope, A.; Rau, U.; Robertson, B. E.; Scott, D.; Swinbank, A. M.; van der Werf, P.; van Kampen, E.; Weiner, B. J.; Windhorst, R. A., The Astrophysical Journal, Vol 833, Issue 1, article id. 12, 11 pp., December 2016
"Deep wideband single pointings and mosaics in radio interferometry : How accurately do we reconstruct intensities and spectral indices of faint sources ?" , U.Rau, S.Bhatnagar, F.N.Owen, Astronomical Journal, Volume 152, No. 5, October 2016
"Efficient implementation of the adaptive scale pixel decomposition algorithm" , L.Zhang, S.Bhatnagar, U.Rau, M.Zhang, Astronomy and Astrophysics, Volume 592, August 2016
"The non-thermal superbubble in IC 10: the generation of cosmic ray electrons caught in the act" "VizieR Online Data Catalog", Volker Heesen, Elias Brinks , Martin G. H. Krause , Jeremy J. Harwood ,Urvashi Rau , Michael P. Rupen , Deidre A. Hunter , Krzysztof T. Chyzy , Ged Kitchener, MNRAS Volume 447,No. 1, L1-L5, February 2015
"Wideband Very Large Array Observations of A2256. I. Continuum, Rotation Measure, and Spectral Imaging", Owen, Frazer N.; Rudnick, Lawrence; Eilek, Jean; Rau, Urvashi; Bhatnagar, Sanjay; Kogan, Leonid, The Astrophysical Journal, Volume 794, Issue 1, article id. 24, 14 pp., October 2014.
Wide-field wide-band interferometric imaging: The WB-A-Projection and hybrid algorithms, S.Bhatnagar, U.Rau, K.Golap, Astrophysical Journal, volume 770, issue 2, id 91, pp.9, June 2013.
A Group Sparsity Imaging Algorithm for Transient Radio Sources , Wenger, S., Rau,U, Magnor,M., Astronomy and Computing, Volume 1, pp 40-45, February,2013.
A multi-scale multi-frequency deconvolution algorithm for synthesis imaging in radio-interferometry, U.Rau, T.J.Cornwell, Astronomy and Astrophysics, Volume 532, August 2011.
EVLA Observations of Galactic Supernova Remnants: Wide-field Continuum and Spectral-index Imaging, S. Bhatnagar, U. Rau, D. A. Green, M. P. Rupen .The Astrophysical Journal Letters, Volume 739, Issue 1, L20, September 2011
Deep Radio Continuum Imaging of the Dwarf Irregular Galaxy IC 10: Tracing Star Formation and Magnetic Fields,V.Heesen, U.Rau, M.P.Rupen, E.Brinks,D.Hunter, The Astrophysical Journal Letters, Volume 739, Issue 1, L23, September 2011.
SparseRI: A Compressed Sensing Framework for Aperture Synthesis Imaging in Radio Astronomy, Wenger, S.; Magnor, M.; Pihlström, Y.; Bhatnagar, S.; Rau, U., PASP, Volume 122, issue 897, pp.1367-1374, November, 2010
Advances in Calibration and Imaging Techniques in Radio Interferometry, U.Rau, S.Bhatnagar, M.A.Voronkov,T.J.Cornwell, Proceedings of the IEEE, Vol.97, No.8, p-1472, August 2009

Conference Papers

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Synergy between radio and optical interferometry: image reconstruction, calibration and data analysis , Rau.U. , Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107011C, 9 July 2018
Direction-Dependent Effects In Wide-Field Wideband Full-Stokes Radio Imaging , Jagannathan, P.; Bhatanagar, S.; Rau, U.; Taylor, R., Astronomical Data Analysis Software an Systems XXIV (ADASS XXIV), Astronomical Society of the Pacific, p379, September 2015.
Wideband Mosaic Imaging with the VLA - quantifying faint source imaging accuracy , Rau,U., Bhatnagar, S., Owen, F.N., Bulletin of the Astrophysical Society of India, 2014.
Radio interferometric imaging of spatial structure that varies with time and frequency, (SPIE link), U.Rau, Proc. SPIE 8500, Image Reconstruction from Incomplete Data VII, 85000N, October 15, 2012
Monte-Carlo Image analysis in Radio Interferometry, Urvashi R.V., T.J.Cornwell, Astronomical Data Analysis Software and Systems XIV ASP Conference Series,Vol. 347,p-168, 2004
Solving for Polarization Leakage in Radio Interferometers Using Unpolarized Sources, Bhatnagar S., Urvashi R.V., Nityananda R.,Astronomical Data Analysis Software and Systems XII ASP Conference Series, Vol. 295, p-469, 2003

Theses

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[Ph.D. Thesis] Parameterized Deconvolution for Wide-Band Radio Synthesis Imaging, Department of Physics, New Mexico Institude of Mining and Technology, Socorro, NM, USA (May 2010).

[M.S. Thesis] A performance model and load balancer for a Parallel Monte-Carlo Cellular microphysiology simulator, Department of Computer Science and Engineering, University of California, San Diego, CA, USA (June 2004). [MCell-K]

Memos/Technical-Reports

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ngVLA Memo 71 : RFI Mitigation in the ngVLA System Architecture Rob Selina, UAlan Erickson, Feb 2020
ngVLA Memo 70 : RFI Mitigation for the ngVLA : A Cost-Benefit Analysis Urvashi Rau, Rob Selina, Alan Erickson, Dec 2019
Radio Interferometric Imaging Algorithms - Summer 2018 , U.Rau, ARDG Note, July 2018.
ARDG Test Report on VLASS Wideband Mosaic Imaging , U.Rau \& S.Bhatnagar, ARDG Memo, Sept 2018.
Convention for UVW calculations in CASA , U.Rau, CASA Memo, 8 Feb 2013
Automatic RFI identification and flagging in CASA , U.Rau, ARDG/CASA Note, 26 June 2011
Imaging Algorithms in CASA , U.Rau, ARDG/CASA Note, 19 November 2010
Casapy Flag tool and casa::Flagger , U.Rau, CASA Programmers Note, 23 August 2007
Design of casa::TablePlot for Casapy , U.Rau, CASA Programmers Note, 18 August 2007
Multi Frequency Synthesis Imaging for the EVLA : An initial investigation , Urvashi R.V., T.J.Cornwell, S.T.Myers, EVLA Memo 101, April 2006
Monte Carlo Methods for Bayesian Image Reconstruction and Analysis in Radio Astronomy , , Urvashi R.V., T.J.Cornwell, EVLA Memo 102. February 2006
Automatic RFI identification and flagging, Urvashi R.V., Rao, A. Pramesh, NCRA Technical Report No. R00202, October 1 2003

Talks/Presentations

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2023

"Introduction to Radio Astronomy for Medical Imagers" "[PPTX]" i2i Workshop, Center for Advanced Imaging Innovation and Research, 19 October 2023, NYU Langone, New York.
"Radio Interferometry - Imaging" Summer Student Lecture, 7th June 2023, Socorro.
"Wide-band and wide-field imaging - 1" "Wide-band and wide-field imaging - 2" Radio Astronomy School (13-24 March 2023), National Centre for Radio Astrophysics/TIFR, Pune, India (remote).
"Imaging in Radio Interferometry" VLTI and ALMA Synthesis Imaging workshop, January 9-12, Garching (remote).

2022

"Radio Interferometry - Imaging" Summer Student Lecture, June 2022, Socorro.
"Wideband and Widefield Imaging : Concepts" 18th NRAO synthesis Imaging Workshop, 20 May 2022, Socorro (Virtual).
"Overview : Radio Interferometry Data Analysis and Compute Needs" HPC Workshop on Radio Astronomy Data Analysis in the SKA Era, 40th Meeting of the Astronomical Society of India, 25 Mar 2022, IIT Roorkee (Virtual)
"RFI Mitigation Options (ngVLA) - SHORT VERSION" NRAO RFI Workshop, Mar 2022. Socorro
"Modeling the Interferometer Response to Satellite RFI" Algorithm R\&D Group Discussion Forum, 11 Feb 2022. Socorro

2021

"Quantifying Scientific Correctness in Radio Interferometric Imaging" ADASS XXXI (Astronomical Data Analysis Software and Systems), 28 October 2021. Cape Town (Virtually).
"CASA and its Evolution" NRAO NM-Update, Oct 2021, NRAO, Socorro.
"Introduction to Radio Astronomy (for Medical Imaging Professionals)" Cells To Galaxies Speaker Series, Oct 2021, NRAO, Socorro.
"Radio Interferometry - Imaging" Summer Student Lectures I and II, June 2021, NRAO, Socorro.

2020

"RFI Mitigation for the ngVLA - A cost benefit analysis" CalTech Radio Camera Imager (and DSA) Seminar series, 25 Sept 2020, (Virtual Talk series)
"Wideband Imaging of Multiscale structure" CHANG-ES ( Continuum Halos in Nearby Galaxies - an EVLA Survey ) Annual Meeting, 23 July 2020, (Virtual Conference)
"RFI Mitigation for the ngVLA - a cost benefit analysis" APS-URSI 2020, 10 July 2020, (Virtual Conference)
"WideBand and WideField Imaging - I", "WideBand and WideField Imaging - II", (Virtual) 17th NRAO Synthesis Imaging Workshop, July 2020, Socorro, NM, USA
"Radio Interferometry - Imaging" Summer Student Lectures I and II, June 2020, NRAO, Socorro.

2019

"Peering Through The Reeds - Radio Astronomy versus Commercial Spectrum Use" New Mexico Tech Physics Dept Colloquium, 7 Nov 2019, Socorro
"Imaging Fundamentals" [ODP file] 7th VLA Data Reduction Workshop, 8 Oct 2019, Socorro
"RFI Mitigation Options in Radio Interferometry" Presentation to the Committee on Radio Frequencies, National Academies of Sciences, Engineering, Medicine, 17 September 2019, Socorro.
"Introduction to Radio Interferometry - Algorithms and Computing" Presentation at the CHTC-NRAO Meeting, 26 August 2019, Socorro.
"Wide Band and Wide Field Imaging - II" Lecture at the 2019 NCRA Radio Astronomy School, 23 August 2019, Pune, India (remote from Socorro).
"Wide Band and Wide Field Imaging - I" Lecture at the 2019 NCRA Radio Astronomy School, 22 August 2019, Pune, India (remote from Socorro).
"Overview of Data Combination Methods - II" Lecture at the 'Improving Image Fidelity on Astronomical Data : Interferometer and Single Dish Data Combination' Workshop, 12 August 2019, Leiden, Netherlands (remote from Socorro).
"Introduction to Radio Interferometry" [ODP file] , Summer Student lecture at the NRAO/SOC, June 2019, Socorro, NM, USA.
"Radio Interferometry - Image Reconstruction, Calibration and Data Analysis", Cells To Galaxies Workshop, 17 Apr 2019, Charlottesville, Virginia, USA

2018

"Wideband Mosaic Imaging for VLASS", Report at a VLASS Meeting, 29 Aug 2018, Socorro, NM, USA.
"Astronomy and Telescopes", Lecture at the NRAO Radio Astronomy and Physics Summer Camp, 6 June 2018, Socorro, NM, USA.
"RFI Mitigation Options for the ngVLA", ngVLA Meeting presentation/discussion, 2 Feb 2018, Socorro, NM, USA.
"Combining single dish and interferometer data for joint wideband multiterm deconvolution", Wednesday Lunch Talk, 11 July 2018, Socorro, NM, USA.
"Imaging and Deconvolution", Summer Student lecture at the NRAO/SOC, 26 June 2018, Socorro, NM, USA.
"Synergy between Radio and Optical Interferometry - Image Reconstruction, Calibration and Data Analysis", SPIE Optical and Infrared Interferometry and Imaging, 13 June 2018, Austin, TX, USA.
"WideBand and WideField Imaging - II", 16th NRAO Synthesis Imaging Workshop, 21 May 2018, Socorro, NM, USA
"WideBand and WideField Imaging - I", 16th NRAO Synthesis Imaging Workshop, 21 May 2018, Socorro, NM, USA
"Computing and Algorithms in Radio Interferometry", Computer Science Department, New Mexico Tech, 20 April 2018, Socorro, NM, USA
"Automated Tuning of RFI Identification and Flagging Algorithms", URSI 2018 - National Radio Science Meeting, 6 January 2018, Boulder, CO, USA
"Combining single dish and interferometer data for joint wideband multi-term deconvolution", URSI 2018 - National Radio Science Meeting, 4 January 2018, Boulder, CO, USA

2017

"Imaging / Image Analysis", Lecture at the 6th VLA Data Reduction Workshop, 23 October, 2017
"Wide-band, wide-field and multi-scale imaging", Lecture at the NCRA-GMRT Radio Astronomy School, 7 September 2017 (remote talk from Socorro)
"Imaging and Deconvolution", Summer Student lecture at the NRAO/SOC, June 2017, Socorro, NM, USA.

2016

"Automated Tuning of RFI Identification and Flagging Algorithms", Talk at RFI2016 : Coexisting with Radio Frequency Interference , 20 October 2016, Socorro, NM, USA.
"Radio Interferometric imaging of spatial structure that varies with time and frequency", Talk at the 9th SKA Calibration and Imaging Workshop , 11 October 2016, Socorro, NM, USA.
"Understanding imaging limits due to approximatioms in ALMA primary beam models" , Talk at the ALMA Future Science Development Program Workshop, 25 August 2016, Charlottesville, Virginia, USA.
"How accurately do our imaging algorithms reconstruct intensities and spectral indices of weak sources ?" , Tuna Lunch talk at NRAO Charlottesville, 23 August 2016, Charlottesville, Virginia, USA.
"Imaging and Deconvolution", Summer Student lecture at the NRAO/SOC, 15 June 2016, Socorro, NM, USA.
"Wide Band and Full Beam Imaging", Lecture at the Fifteenth NRAO Synthesis-Imaging Workshop, 6 June 2014, Socorro, NM, USA.
"RFI Identification and Automatic Flagging" , Lecture at the VLA Data Reduction Workshop, 15 March 2016, Socorro, NM, USA

2015

"Imaging and Deconvolution", Summer Student lecture at the NRAO/SOC, 17 June 2015, Socorro, NM, USA.
"How the CASA Imager uses the parallelization infrastructure", Presentation to the CASA HPC Team, 24 March 2015, Socorro, NM, USA.

2014

"Imaging: status priorities, issues", Presentation to CASA Users Committee, 23 September 2014, Socorro, NM, USA.
"Imaging and Deconvolution", Summer Student lecture at the NRAO/SOC, 20 June 2014, Socorro, NM, USA.
"Wide Bandwidth Imaging", Fourteenth NRAO Synthesis-Imaging Workshop, 19 May 2014, Socorro, NM, USA.
"How accurately do our imaging algorithms reconstruct intensities and spectral indices of weak sources ?" , Talk at the 8th SKA Calibration and Imaging Workshop, 6 March 2014, Kiama, NSW, Australia (via Skype from Socorro).
"How accurately do our imaging algorithms reconstruct intensities and spectral indices of weak sources ?" , Talk at the 29th Annual New Mexico Symposium, 17 January 2014, Socorro, NM, USA.

2013

"Wideband Mosaics - Accuracy of deep imaging surveys" , Talk at the Meter Wavelength Sky conference, 12 Dec 2013, GMRT/NCRA, Pune, India
"How accurately do our imaging algorithms reconstruct intensities and spectral indices of weak sources ?" , Wednesday Lunch talk at the NRAO/SOC, 13 Nov 2013, Socorro, NM, USA.
"Imaging and Deconvolution", Summer Student lecture at the NRAO/SOC, 20 June 2013, Socorro, NM, USA.
"Wideband Wide Field Imaging (Sky Domain)" , Lecture at the VLA Data Reduction Workshop, 9 April 2013, Socorro
"RFI Identification" , Lecture at the VLA Data Reduction Workshop, 9 April 2013, Socorro
"Deconvolution and wideband Imaging" , Lecture at the 3GC3 Interferometry School, 13 February 2013, Port Alfred, South Africa (via Skype from Socorro)

2012

"Wideband mosaics", Talk at the Seventh SKA Calibration and Imaging workshop, 5 December 2012, Cape Town, South Africa
"Wideband Imaging", Lecture at the CSIRO Astronomy and Space Sciences Radio Astronomy School, 27 September 2012, Narrabri, NSW, Australia.
"Imaging and Deconvolution", Lecture at the CSIRO Astronomy and Space Sciences Radio Astronomy School, 25 September 2012, Narrabri, NSW, Australia.
"Radio Interferometric Imaging of spatial structure that varies with time and frequency", SPIE Optical Engineering+Applications, 15 August 2012, San Diego, CA, USA; ----- NRAO Wednesday-Lunch, 29 August 2012, Socorro, NM, USA; ----- Talk at the CASS,CSIRO, 18 September 2012, Sydney,Australia.
"Sky-domain algorithms to reconstruct spatial, spectral and time-variable structure of the sky-brightness distribution", National Centre for Radio Astrophysics, TIFR, 2 July 2012, Pune, India.
"Wide Bandwidth Imaging", Thirteenth NRAO Synthesis-Imaging Workshop, 31 May 2012, Socorro, NM, USA.
"Correcting for wide-band primary-beam effects during imaging and deconvolution", [OpenOffice version], Wednesday Lunch talk at the NRAO/SOC, 28 March 2012, Socorro, NM, USA.
Flagging Capabilities in CASA 3.4, Presentation for EVLA CASA commissioning meeting, 6 Mar 2012, Socorro, NM, USA.
"Wide-band (wide-field) imaging + Flagging/RFI", [OpenOffice version], EVLA Data Reduction Workshop, 24 Feb 2012, Socorro, NM, USA.

2011

"Wide-field Wide-band Imaging with the EVLA - II", EVLA Data Reduction Workshop, 15 September 2011, Socorro, NM, USA.
"Synthesis Imaging in Radio Astronomy - Reconstructing spatial and spectral structure of an astronomical source", BASP (Biomedical and Astronomical Signal Processing) Frontiers Workshop, 06 September 2011, Villars, Switzerland.
"Multi-frequency synthesis and wide-field imaging with the EVLA", URSI General Assembly, 17 August 2011, Istanbul, Turkey,
"Recent Imaging Results with EVLA data, and lessons learnt so far", Sixth SKA Calibration and Imaging Workshop, 26 July 2011, Manchester, UK (via Skype).
"Wideband imaging with the EVLA", NRAO Algorithm R&D Group Lecture-series, 21 July 2011, Socorro, USA.

2010

"Pilot Project for an EVLA wide-band Galactic-plane survey : first results" , 26th Annual New Mexico Symposium, 5 November 2010, Socorro, NM, USA.
"A few imaging results using wide-band EVLA data" , Wednesday Lunch talk at the NRAO/SOC, 3 November 2010, Socorro, NM, USA.
"Wide-field Wide-band image reconstruction with the EVLA", Univ. of New Mexico Physics Dept. Seminar, 30 September 2010, Albuquerque, NM, USA.
"Feasibility of wide-band imaging (using MS-MFS)", Talk at the Fifth SKA Calibration and Imaging workshop, 23 August 2010, Dwingeloo, The Netherlands.
"Wide-Field Wide-Band Imaging in Radio Interferometry", NCRA Colloquium, 12 July 2010, Pune, India
"Parameterized Deconvolution for Wide-Band Radio Synthesis Imaging", PhD Thesis Defense, 17 May 2010, Socorro, NM, USA
"Wide-Field Wide-Band Imaging With the EVLA", 215th AAS meeting, 6 January 2010, Washington, DC, USA

2009

"Feasibility of Multi-Frequency-Synthesis - for non-standard cases", Presentation to the NRAO Algorithm Research and Development Group, 16 July 2009, Socorro, USA
"Wide-Field Wide-Band Imaging in Radio Interferometry", Talk at the ATNF Student Symposium, 16 June 2009, Sydney, AU (via audio link from Socorro)
"Remote Sensing, Image Making and Radio Telescopes ", Colloquium at the New Mexico Tech Physics Department, 09 Apr 2009, Socorro, USA
"Wide-Field Wide-Band Imaging with the EVLA - initial results", Talk at the Fourth SKA Calibration and Imaging Workshop, 31 March 2009, Socorro, USA
"Multi Frequency Synthesis Imaging with Wideband EVLA data",Lunch Talk at the EVLA Advisory Committee Meeting, 19-20 March 2009, Socorro, USA

2008

"Multi-Frequency Synthesis Imaging with Multi-Scale Deconvolution (EVLA, e-MERLIN)", Talk at the Workshop on Imaging and Calibration Algorithms for EVLA, eMERLIN and ALMA, 02 December 2008, Oxford, UK (via video link from Socorro)
"Multi-Frequency Synthesis Imaging with Wide-Band (E)VLA data", Talk at the 24th Annual New Mexico Symposium, 24 October 2008, Socorro, USA
"Multi-Frequency Synthesis Imaging with Multi-Scale Deconvolution", Invited Talk at the XXIX URSI General Assembly, 15 August 2008, Chicago, USA
"Wide-Band Imaging - Algorithms and Errors", Talk at the Third SKA Calibration and Imaging Workshop, 09 April 2008, Perth, AU
"Multi-Frequency Synthesis Imaging with the EVLA - initial results from a test observation of Cygnus-A at L-Band", Wednesday Lunch Talk at the NRAO-AOC, 05 March 2008, Socorro, USA
"Multi-Frequency Synthesis Imaging with the EVLA", Tuna Lunch Talk at NRAO-CV, 29 January 2009, Charlottesville, USA

2006-2007

"Multi-Frequency Synthesis Imaging with Multi-Scale deconvolution", Talk at the Workshop on Radio Surveys Science and Techniques, 18 April 2007, Los Alamos, USA
"Multi-Frequency Synthesis Imaging with Multi-Scale deconvolution", Talk at the National Centre for Radio Astrophysics (TIFR), 17 November 2006, Pune, India
"Multi-Frequency Synthesis Imaging with Multi-Scale deconvolution", Talk at the Second SKA Calibration and Imaging Workshop, 05 December 2006, Cape Town, South Africa
"Multi-Frequency Synthesis Imaging with Multi-Scale deconvolution", Galaxy Lunch Talk at the Aistralia Telescope National Facility(ATNF), 06 June 2006, Marsfield/Sydney, AU
"Wide Bandwidth Imaging: Challenges and prospects for the EVLA and beyond" ,Talk at the URSI National Radio Science Meeting, 06 January 2006, Boulder, USA