Dr. Jack Singal

Associate Professor of Physics

Profile

My research connects several important topics in the emerging era of big data astrophysics. We carry out population studies of active galaxies and explore questions such as how they have changed over the history of the Universe, utilizing observational data from ground and satellite-based surveys in visible light, radio waves, gamma rays, and other kinds of light. I am involved in several projects with external collaborators, including at NASA and the National Radio Astronomy Observatory, to explore the mystery of the diffuse radio background. We are also involved in exploring photometric redshift strategies for large-scale surveys, and have a laboratory program to make precision measurements of subtle distortion effects on telescope images, which are an increasing challenge for coming astronomical surveys. 

Presentations

Public Talk: The Light Our Eyes Can't See
University of Richmond Downtown, June 6, 2017

Presentation: CMB@50 Conference
Princeton University, June 10, 2015

Colloquium: Harvard Smithsonian Center for Astrophysics
Harvard University, February 11, 2016

Professional Experience

Postdoctoral Scientist, Stanford University and SLAC National Accelerator Laboratory (2007-2013)

Postdoctoral Resesarcher, NASA Goddard Space Flight Center (2007)

Selected Publications

Articles

 “The Radio Synchrotron Background: Conference Summary and Report.” J. Singal,  J. Haider, M. Ajello, D. R. Ballantyne, E. Bunn, J. Condon, J. Dowell, D. Fixsen, N. Fornengo, B. Harms, G. Holder, E. Jones, K. Kellermann, A. Kogut, T. Linden, R. Monsalve, P. Mertsch, E. Murphy, E. Orlando, M. Regis, D. Scott, T. Vernstrom, & L. Xu, 2018, PASP, 130, 985

Analysis of a Custom Support Vector Machine for Photometric Redshift Estimation and the Inclusion of Galaxy Shape Information.  E. Jones & J. Singal, 2017, A&A, 600, A113.

The Mid-Infrared Luminosity Evolution and Luminosity Function of Quasars with SDSS and WISE.  J. Singal, J. George, and A. Gerber, 2016, ApJ, 831, 60

A Determination of the Gamma-ray Flux and Photon Spectral Index Distributions of Blazars from the Fermi-LAT 3LAC.  J. Singal, 2015, MNRAS, 115, 122

Axial Ratio of Edge-On Spiral Galaxies as a Test For Bright Radio Halos.  J. Singal, A. Kogut, E. Jones, and H. Dunlap, 2015, ApJL, 799, L10

Gamma-ray Luminosity and Photon Index Evolution of FSRQ Blazars and Contribution to the Gamma-ray Background. J. Singal, A. Ko, and V. Petrosian, 2014, ApJ, 786, 109

Geant4 Applications for Modeling Molecular Transport in Complex Vacuum Geometries. J. Singal, J. Langton, and R. Schindler, 2014, IJMSSC, 5, 2

Determination of the intrinsic Luminosity Time Correlation in the X-ray Afterglows of GRBs. M. Dainotti, V. Petrosian, J. Singal, and M. Ostrowski, 2013, ApJ, 774, 157

The Radio and Optical Luminosity Evolution of Quasars II – The SDSS Sample.” J. Singal, V. Petrosian, L. Stawarz, and A. Lawrence, 2013, ApJ, 764, 43

Flux and Photon Spectral Index Distributions of Fermi-LAT Blazars and Contribution to the Extragalactic Gamma-ray Background.” J. Singal, V. Petrosian, and M. Ajello, 2012, ApJ, 753, 45

On The Radio and Optical Luminosity Evolution of Quasars.” J. Singal, V. Petrosian, A. Lawrence, and L. Stawarz, 2011, ApJ, 743, 104

The Efficacy of Galaxy Shape Parameters in Photometric Redshift Estimation: A Neural Network Approach.” J. Singal, M. Shmakova, B. Gerke, and J. Lotz, 2011, PASP, 615, 621

The ARCADE 2 Instrument.” J. Singal, D. Fixsen, A. Kogut, S. Levin, M. Limon, P. Lubin, P. Mirel, M. Seiffert, T. Villela, E. Wollack, and C.A. Wuensche, 2011, ApJ, 730, 138

ARCADE 2 Measurement of the Absolute Sky Brightness at 3-90 GHz.” D. Fixsen, A. Kogut, S. Levin, M. Limon, P. Lubin, P. Mirel, M. Seiffert, J. Singal, T. Villela, E. Wollack, and C.A. Wuensche, 2011, ApJ, 734, 5

ARCADE 2 Observations of Galactic Radio Emission.” A. Kogut, D. Fixsen, S. Levin, M. Limon, P. Lubin, P. Mirel, M. Seiffert, J. Singal, T. Villela, E. Wollack, and C.A. Wuensche, 2011, ApJ, 734, 4

Interpretation of the ARCADE 2 Absolute Sky Brightness Measurement.” M. Seiffert, D. Fixsen, A. Kogut, S. Levin, M. Limon, P. Lubin, P. Mirel, J. Singal, T. Villela, E. Wollack, and C.A. Wuensche, 2011, ApJ, 734, 6

Sources of the Radio Background Considered.” J. Singal, L. Stawarz, A. Lawrence, and V. Petrosian, 2010, MNRAS, 409, 1172

“The Cosmic Radio Background and AGN Connection.” J. Singal, L. Stawarz, A. Lawrence, and V. Petrosian, 2010, IJMPD, 19, 965

“A Multi-Chamber System for Analyzing the Outgassing, Deposition, and Associated Optical Degradation Properties of Materials in a Vacuum.” J. Singal, R. Schindler, C. Chang, P. Czodrowski, and P. Kim, 2010, Rev Sci Instrum, 81, 025101

“PHAT: Photo-z Accuracy Testing.” H. Hildebrandt, S. Arnouts, P. Capak, L. Moustakas, C. Wolf, F. Abdalla, R. Assef, M. Banerj, G. Brammer, S. Carliles, D. Coe, T. Dahlen, R. Feldmann, D. Gerdes, B. Gillis, R. Kotulla, I. Li, J.-M. Miralles, N. Purger, S. Schmidt, and J. Singal, 2010, A&A, 523, A31

Education

Ph.D., University of California, Santa Barbara
Physics

B.S., New York University
Physics

Contact Information

(804) 287-6537
(Mobile)

Areas of Expertise

Multiwavelength astrophysics analysis
Data challenges in large survey astrophysics
Studies of the diffuse radio background
Instrumentation methods in visible and radio wavelengths