1 to 10 of 14 Results
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, "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 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 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... |
Sep 14, 2020
Daniel Stern, 2020, "The Chandra Deep Wide-Field Survey: A New Chandra Legacy Survey in the Boo ̈tes Field I. X-ray Point Source Catalog, Number Counts and Multi-Wavelength Counterparts", https://doi.org/10.48577/jpl.CUEEOT, Astrophysical Journal, JPL Open Repository
We present a new, ambitious survey performed with the Chandra X-ray Observatory of the 9.3 deg2 Bo¨otes field of the NOAO Deep Wide-Field Survey. The wide field probes a statistically representative volume of the Universe at high redshift. The Chandra Deep Wide-Field Survey explo... |
Sep 14, 2020
Daniel Stern, 2020, "SWIFT MONITORING OF M51: A 38-DAY SUPER-ORBITAL PERIOD FOR THE PULSAR ULX7 AND A NEW TRANSIENT ULX", https://doi.org/10.48577/jpl.SPIQJR, Astrophysical Journal, JPL Open Repository
We present the results from a monitoring campaign made with the Neil Gehrels Swift Observatory of the M51 galaxies, which contain several variable ultraluminous X-ray sources (ULXs). The ongoing campaign started in May 2018, and we report here on ∼ 1.5 years of observations. The... |
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... |
