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. For this we utilize observational data from ground and satellite-based surveys in visible light, radio waves, gamma rays, and other kinds of light. We also have a laboratory program to make precision measurements of subtle distortion effects on telescope images, which are an increasing challenge for coming astronomical surveys. Additionally, we are involved in exploring survey issues such as photometric redshifts, and in ongoing projects characterizing the diffuse radio and microwave light from the cosmos.
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
“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
