Sciences and Exploration Directorate

Keith M Jahoda

((AST, FIELDS & PARTICLES))

Keith M Jahoda's Contact Card & Information.
Email: keith.m.jahoda@nasa.gov
Phone: 301.286.3527
Org Code: 662
Address:
NASA/GSFC
Mail Code 662.1
Greenbelt, MD 20771
Employer:
NASA

Missions & Projects

Current Projects


Polarimeter for Relativistic Astrophysical X-ray Sources (PRAXyS)

PI of the PRAXyS mission, selected in August 2015 for a Phase A study.    PRAXyS is a Small Explorer mission that will provide the first sensitive survey of the X-ray polarization of black hole and neutron star sources.   Polarization is expected to yield clues to the geometry and emission mechanisms not available via other observational channels.    PRAXyS exploits the polarization sensitivity of photoelectric absorption


HaloSat

Co-Investigator.    HaloSat is an APRA funded CubeSat mission that will search for evidence of a hot galactic halo of the Milyway Galaxy.    Oxygen line emission will trace the distribution of the halo, which could account for up to half of all normal matter associated with the Galaxy.  The HaloSat collaboration is led by Prof. P. Kaaret at the U. of Iowa.

Education


Doctor of Philosophy,  University of Wisconsin, Madison, 1986
    Thesis: "H I Structure and the Soft X-ray Background",  Advisor: Professor Dan McCammon
Bachelor of Arts,  Swarthmore College, 1979

Publications


Refereed

2021. "HaloSat Observations of Heliospheric Solar Wind Charge Exchange." The Astrophysical Journal 918 (2): 41 [10.3847/1538-4357/ac0e33] [Journal Article/Letter]

2021. "A Search for the 3.5 keV Line from the Milky Way’s Dark Matter Halo with HaloSat." The Astrophysical Journal 916 (1): 2 [10.3847/1538-4357/ac043b] [Journal Article/Letter]

2021. "Total X-Ray Emission from the LMC Observed with HaloSat." The Astronomical Journal 161 (2): 57 [10.3847/1538-3881/abccd0] [Journal Article/Letter]

2020. "On-ground calibration of the HaloSat science instrument." Journal of Astronomical Telescopes, Instruments, and Systems 6 (04): [10.1117/1.jatis.6.4.044005] [Journal Article/Letter]

2020. "A HaloSat Analysis of the Cygnus Superbubble." The Astrophysical Journal 905 (2): 91 [10.3847/1538-4357/abc41b] [Journal Article/Letter]

2020. "An Analysis of the North Polar Spur Using HaloSat." The Astrophysical Journal 904 (1): 54 [10.3847/1538-4357/abbdfd] [Journal Article/Letter]

2020. "A disk-dominated and clumpy circumgalactic medium of the Milky Way seen in X-ray emission." Nature Astronomy 4 (11): 1072-1077 [10.1038/s41550-020-01215-w] [Journal Article/Letter]

2020. "Global X-Ray Properties of the Vela and Puppis A Supernova Remnants." The Astronomical Journal 160 (1): 20 [10.3847/1538-3881/ab93d3] [Journal Article/Letter]

2020. "Design and construction of the x-ray instrumentation onboard the HaloSat CubeSat." Journal of Astronomical Telescopes, Instruments, and Systems 6 (01): 1 [10.1117/1.jatis.6.1.014003] [Journal Article/Letter]

2019. "HaloSat: A CubeSat to Study the Hot Galactic Halo." The Astrophysical Journal 884 (2): 162 [10.3847/1538-4357/ab4193] [Journal Article/Letter]

2019. "The X-ray Polarization Probe mission concept." arXiv e-prints arXiv:1907.10190 [Proceedings]

2019. "Astro2020 Science White Paper: Using X-Ray Polarimetry to Probe the Physics of Black Holes and Neutron Stars." arXiv e-prints arXiv:1904.09313 [Proceedings]

2018. "An optimized photoelectron track reconstruction method for photoelectric X-ray polarimeters." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 880 188-193 [10.1016/j.nima.2017.10.070] [Journal Article/Letter]

2016. "Performance of the PRAXyS X-ray polarimeter." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 838 89-95 [10.1016/j.nima.2016.09.024] [Journal Article/Letter]

2016. "The Polarimeter for Relativistic Astrophysical X-ray Sources." Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray [10.1117/12.2234220] [Proceedings]

2012. "ADVANCES IN THE RXTE PROPORTIONAL COUNTER ARRAY CALIBRATION: NEARING THE STATISTICAL LIMIT." Astrophysical Journal 757 159 [10.1088/0004-637X/757/2/159] [Journal Article/Letter]

2011. "When a Standard Candle Flickers." The Astrophysical Journal Letters [10.1088/2041-8205/727/2/L40] [Journal Article/Letter]

2010. "On Calibrations Using the Crab Nebula and Models of the Nebular X-Ray Emission." The Astrophysical Journal 713 912 [Full Text] [10.1088/0004-637X/713/2/912] [Journal Article/Letter]

2007. "Does the Blazar Gamma-Ray Spectrum Harden with Increasing Flux? Analysis of 9 Years of EGRET Data." The Astrophysical Journal 657 706 [Full Text] [10.1086/510795] [Journal Article/Letter]

2006. "Calibration of the Rossi X-Ray Timing Explorer Proportional Counter Array." The Astrophysical Journal Supplement Series 163 401 [Full Text] [10.1086/500659] [Journal Article/Letter]

2005. "Intensity of the cosmic X-ray backgound from HEAO1/A2 experiment." Astronomy and Astrophysics 444 381 [Full Text] [10.1051/0004-6361:20042526] [Journal Article/Letter]

2004. "Absolute Timing of the Crab Pulsar with the Rossi X-Ray Timing Explorer." The Astrophysical Journal 605 L129 [Full Text] [10.1086/420842] [Journal Article/Letter]

2004. "RXTE all-sky slew survey Catalog of X-ray sources at |b|>10o." Astronomy and Astrophysics, v418, p927-936 (2004) 418 927 [Full Text] [10.1051/0004-6361:20035798] [Journal Article/Letter]

2003. "DUET - The Dark Universe Exploration Telescope." Astronomische Nachrichten, Vol 324, No 1-2, p 132-135 324 132 [Full Text] [Journal Article/Letter]

2003. "X-ray spectral variability of the Seyfert galaxy NGC 4051." Monthly Notice of the Royal Astronomical Society 338 323 [Full Text] [10.1046/j.1365-8711.2003.06005.x] [Journal Article/Letter]

2003. "The imaging X-ray detector for Lobster-ISS." Nuclear Instruments and Methods in Physics Research Section A 513 123 [Full Text] [10.1016/j.nima.2003.08.015] [Journal Article/Letter]

2003. "The spectrum of the cosmic X-ray background observed by RTXE/PCA." Astronomy and Astrophysics, v411, p329-334 (2003) 411 329 [Full Text] [10.1051/0004-6361:20031386] [Journal Article/Letter]

2002. "X-ray and γ-ray spectra and variability of the black hole candidate GX 339-4." Monthly Notice of the Royal Astronomical Society 337 829 [Full Text] [10.1046/j.1365-8711.2002.05914.x] [Journal Article/Letter]

2002. "Large-area imaging micro-well detectors for high-energy astrophysics." Nuclear Instruments and Methods in Physics Research Section A 478 130 [Full Text] [10.1016/S0168-9002(01)01732-6] [Journal Article/Letter]

2000. "The 2-10 keV X-Ray Background Dipole and Its Cosmological Implications." The Astrophysical Journal 544 49 [Full Text] [10.1086/317174] [Journal Article/Letter]

1993. "Resolving the iron K line in Cygnus X-2; an observation with BBXRT." ApJ 410 796. [Journal Article/Letter]

1986. "The structure of galactic HI in directions of low total column density." The Astrophysical Journal 302 432 [10.1086/164002] [Journal Article/Letter]

Non-Refereed

2018. "The Segmented Aperture Interferometric Nulling Testbed (SAINT) III: control systems analysis and preliminary results." Proc. SPIE, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave 10698 [10.1117/12.2318756] [Proceedings]

2016. "The x-ray polarimeter instrument on board the Polarimeter for Relativistic Astrophysical X-ray Sources (PRAXyS) mission." Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray 99051B [10.1117/12.2233322] [Proceedings]