1 to 10 of 24 Results
May 29, 2024
Daniel Stern, 2024, "NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes", https://doi.org/10.48577/jpl.NQJCVA, Astrophysical Journal, JPL Open Repository
We present analysis of NuSTAR X-ray observations of three AGN that were identified as candidate subparsec binary supermassive black hole (SMBH) systems in the Catalina Real-Time Transient Survey based on apparent periodicity in their optical light curves. Simulations predict that... |
Dec 6, 2023
Daniel Stern, 2023, "The High Energy X-ray Probe (HEX-P): resolving the nature of Sgr A* flares, compact object binaries, ultra-relativistic cosmic-rays and particle accelerators in the Galactic Center", https://doi.org/10.48577/jpl.BCST9N, Frontiers in Astronomy and Space Sciences, JPL Open Repository
HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging (< 10′′ FWHM) and broad spectral coverage (0.2–80 keV) with a sensitivity far superior to current facilities (including XMM-Newton and NuSTAR). These capabilities will enable revolution... |
Nov 22, 2023
Daniel Stern, 2023, "The High Energy X-ray Probe (HEX-P): Probing Accretion onto Stellar Mass Black Holes", https://doi.org/10.48577/jpl.BJHZU1, Frontiers in Astronomy and Space Sciences, JPL Open Repository
Accretion is a universal astrophysical process that plays a key role in cosmic history, from the epoch of reionization to galaxy and stellar formation and evolution. Accreting stellar-mass black holes in X-ray binaries are one of the best laboratories to study the accretion proce... |
Oct 30, 2023
Daniel Stern, 2023, "The High Energy X-ray Probe: Resolved X-ray Populations in Extragalactic Environments", https://doi.org/10.48577/jpl.ASQKCD, Frontiers in Astronomy and Space Sciences, JPL Open Repository
The High Energy X-ray Probe (HEX-P) is a probe-class mission concept that will combine high spatial resolution X-ray imaging (<20 arcsec FWHM) and broad spectral coverage (0.2–80 keV) with a sensitivity superior to current facilities (including XMM-Newton and NuSTAR). HEX-P will... |
Oct 30, 2023
Daniel Stern, 2023, "The High Energy X-ray Probe (HEX-P): Studying Extreme Accretion with Ultraluminous X-ray Sources", https://doi.org/10.48577/jpl.3AYAGF, Frontiers in Astronomy and Space Sciences, JPL Open Repository
Ultraluminous X-ray sources (ULXs) represent an extreme class of accreting compact objects: from the identification of some of the accretors as neutron stars to the detection of powerful winds travelling at 0.1-0.2 c, the increasing evidence points towards ULXs harbouring stellar... |
Oct 1, 2020
Daniel Stern, 2020, "SN 1987A: CONSTRAINING THE HARD X-RAY CONTINUUM AND ITS EVOLUTION WITH NUSTAR", https://doi.org/10.48577/jpl.LQN1YG, Astrophysical Journal, JPL Open Repository
NuSTAR observed SN1987A multiple times from July 2012 to August 2014 with a total exposure of 2.7 Ms. These observations allowed the determination of the hard X-ray emission from the remnant up to ∼ 25 keV. The continuum spectrum between 3 and 25 keV can be equally well described... |
Sep 16, 2020
Daniel Stern, 2020, "Chandra Observations of Candidate Sub-Parsec Binary Supermassive Black Holes", https://doi.org/10.48577/jpl.II0DEP, Astrophysical Journal, JPL Open Repository
We present analysis of Chandra X-ray observations of seven quasars that were identified as candi- date sub-parsec binary supermassive black hole (SMBH) systems in the Catalina Real-Time Transient Survey (CRTS) based on apparent periodicity in their optical light curves. Simulatio... |
Sep 15, 2020
Daniel Stern, 2020, "BAT AGN Spectroscopic Survey – XIII. The nature of the most luminous obscured AGN in the low-redshift universe", https://doi.org/10.48577/jpl.GKY0JM, Monthly Notices of the Royal Astronomical Society, JPL Open Repository
We present a multi wavelength analysis of the 28 most luminous low-redshift narrow-line,ultra-hard X-ray selected active galactic nuclei (AGN) within the 70 month Swift/BAT all-skysurvey, with bolometric luminosities of log¹Lbolerg s1º > 45:25. The broad goal of our studyis to... |
Sep 15, 2020
Daniel Stern, 2020, "SAGITTARIUS A⋆ HIGH ENERGY X-RAY FLARE PROPERTIES DURING NuSTAR MONITORING OF THE GALACTIC CENTER FROM 2012 TO 2015", https://doi.org/10.48577/jpl.TRBTIW, Astrophysical Journal, JPL Open Repository
Understanding the origin of the aring activity from the Galactic center supermassive black hole, Sagittarius A?, is a major scientic goal of the NuSTAR Galactic plane survey campaign. We report on the data obtained between July 2012 and April 2015, including 28 observations with... |
Sep 15, 2020
Daniel Stern, 2020, "An Iwasawa-Taniguchi Effect for Compton-thick Active Galactic Nuclei", https://doi.org/10.48577/jpl.9VMAHO, Monthly Notices of the Royal Astronomical Society, JPL Open Repository
Here we present the first study of an Iwasawa-Taniguchi/‘X-ray Baldwin’ e↵ect forCompton-thick active galactic nuclei (AGN). We report a statistically significant anticorrelationbetween the rest-frame equivalent width (EW) of the narrow core of theneutral FeK↵ fluorescence emissi... |
