11 to 20 of 55 Results
Nov 27, 2023
Daniel Stern, 2023, "The High Energy X-ray Probe (HEX-P): Supernova remnants, pulsar wind nebulae, and nuclear astrophysics", https://doi.org/10.48577/jpl.Q2LZA6, Frontiers of Astronomy and Space Sciences, JPL Open Repository
HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging and broad spectral coverage (0.2--80 keV) with a sensitivity area far superior to current facilities (including XMM-Newton and NuSTAR) to enable revolutionary new insights into a variet... |
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... |
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... |
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 16, 2020
Daniel Stern, 2020, "A deep X-ray view of the bare AGN Ark120. IV. XMM-Newton and NuSTAR spectra dominated by two temperature (warm, hot) Comptonization processes.", https://doi.org/10.48577/jpl.JBJOUJ, Astronomy & Astrophysics, JPL Open Repository
Context. The physical characteristics of the material closest to supermassive black holes (SMBHs) are primarily studied through X-ray observations. However, the origins of the main X-ray components such as the soft X-ray excess, the FeK line complex, and the hard X-ray excess ar... |
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 1014 erg s1 cm2 in the multi-tiered NuSTAR Extragalactic Survey program. The sources span a redshift range z = 02:1, and have a median redshif... |
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... |
