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1 to 10 of 24 Results
The High Energy X-ray Probe (HEX-P): The Circum-nuclear Environment of Growing Supermassive Black HolesEmbargoed
Feb 26, 2024
Daniel Stern, 2024, "The High Energy X-ray Probe (HEX-P): The Circum-nuclear Environment of Growing Supermassive Black Holes", https://doi.org/10.48577/jpl.SVQS4M, Frontiers in Astronomy and Space Sciences, JPL Open Repository
Ever since the discovery of the first Active Galactic Nuclei (AGN), substantial observational and theoretical effort has been invested into understanding how massive black holes have evolved across cosmic time. Circum-nuclear obscuration is now established as a crucial component,...
The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into FocusEmbargoed
Feb 26, 2024
Daniel Stern, 2024, "The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into Focus", https://doi.org/10.48577/jpl.BXFC99, Frontiers of Astronomy and Space Sciences, JPL Open Repository
Since the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10--40 keV band. Existing soft X-ray telescopes could study this population up to only 10 keV, and, whil...
The High Energy X-ray Probe (HEX-P): Constraining Supermassive Black Hole Growth with Population Spin MeasurementsEmbargoed
Feb 20, 2024
Daniel Stern, 2024, "The High Energy X-ray Probe (HEX-P): Constraining Supermassive Black Hole Growth with Population Spin Measurements", https://doi.org/10.48577/jpl.WMOYEB, Frontiers in Astronomy and Space Sciences, JPL Open Repository
Constraining the primary growth channel of supermassive black holes (SMBH) remains one the most actively debated questions in the context of cosmological structure formation. Owing to the expected connection between SMBH spin parameter evolution and the accretion and merger histo...
The High Energy X-ray Probe (HEX-P): Magnetars and Other Isolated Neutron StarsEmbargoed
Dec 7, 2023
Daniel Stern, 2023, "The High Energy X-ray Probe (HEX-P): Magnetars and Other Isolated Neutron Stars", https://doi.org/10.48577/jpl.BBLHOG, Frontiers in Astronomy and Space Sciences, JPL Open Repository
The hard X-ray emission from magnetars and other isolated neutron stars remains under- explored. An instrument with higher sensitivity to hard X-rays is critical to understanding the physics of neutron star magnetospheres and also the relationship between magnetars and Fast Radio...
GAIA GRAL: GAIA DR2 GRAVITATIONAL LENS SYSTEMS. VI. SPECTROSCOPIC CONFIRMATION AND MODELING OF QUADRUPLY-IMAGED LENSED QUASARS
Jun 28, 2021
Daniel Stern, 2021, "GAIA GRAL: GAIA DR2 GRAVITATIONAL LENS SYSTEMS. VI. SPECTROSCOPIC CONFIRMATION AND MODELING OF QUADRUPLY-IMAGED LENSED QUASARS", https://doi.org/10.48577/jpl.HLB4SF, Astrophysical Journal, JPL Open Repository
Combining the exquisite angular resolution of Gaia with optical light curves and WISE photometry, the Gaia Gravitational Lenses working group (GraL) uses machine learning techniques to identify candidate strongly lensed quasars, and has confirmed over two dozen new strongly lense...
THE NuSTAR EXTRAGALACTIC SURVEYS: X-RAY SPECTROSCOPIC ANALYSIS OF THE BRIGHT HARD-BAND SELECTED SAMPLE
Sep 16, 2020
Daniel Stern, 2020, "THE NuSTAR EXTRAGALACTIC SURVEYS: X-RAY SPECTROSCOPIC ANALYSIS OF THE BRIGHT HARD-BAND SELECTED SAMPLE", https://doi.org/10.48577/jpl.E56NMC, Astrophysical Journal, JPL Open Repository
We discuss the spectral analysis of a sample of 63 Active Galactic Nuclei (AGN) detected above a limiting ux of S(8 􀀀 24keV) = 7 10􀀀14 erg s􀀀1 cm􀀀2 in the multi-tiered NuSTAR Extragalactic Survey program. The sources span a redshift range z = 0􀀀2:1, and have a median redshif...
A Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational Wave Event GW190521g
Sep 14, 2020
Daniel Stern, 2020, "A Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational Wave Event GW190521g", https://doi.org/10.48577/jpl.QSISM2, Physical Review Letters, JPL Open Repository
We report the first plausible candidate electromagnetic (EM) counterpart to a binary black hole (BBH) merger. The EM flare is consistent with expectations for a kicked BBH merger in the accretion disk of an active galactic nucleus (AGN) [1], and is unlikely (< O(0.01%)) due to in...
The Unusual Broadband X-ray Spectral Variability of NGC 1313 X-1 seen with XMM-Newton, Chandra and NuSTAR
Sep 14, 2020
Daniel Stern, 2020, "The Unusual Broadband X-ray Spectral Variability of NGC 1313 X-1 seen with XMM-Newton, Chandra and NuSTAR", https://doi.org/10.48577/jpl.62MQVH, Monthly Notices of the Royal Astronomical Society, JPL Open Repository
We present results from the major coordinated X-ray observing program on the ULX NGC1313 X-1 performed in 2017, combining XMM-Newton, Chandra and NuSTAR, fo- cusing on the evolution of the broadband (∼0.3–30.0 keV) continuum emission. Clear and unusual spectral variability is obs...
THE NUSTAR SERENDIPITOUS SURVEY: HUNTING FOR THE MOST EXTREME OBSCURED AGN AT > 10 KEV
Jul 24, 2017
Daniel Stern, 2017, "THE NUSTAR SERENDIPITOUS SURVEY: HUNTING FOR THE MOST EXTREME OBSCURED AGN AT > 10 KEV", https://doi.org/10.48577/jpl.IFM0TV, Astrophysical Journal, JPL Open Repository
No abstract available.
THE BROADBAND SPECTRAL VARIABILITY OF HOLMBERGIX X-1
May 30, 2017
Daniel Stern, 2017, "THE BROADBAND SPECTRAL VARIABILITY OF HOLMBERGIX X-1", https://doi.org/10.48577/jpl.AQQERH, Astrophysical Journal, JPL Open Repository
No abstract available.
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