2.3k citations · 22.2k across the 115 of their papers we have counts for
20 papers · 1 filter
Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013
M. Baloković, D. Paneque, G. Madejski +305
We present coordinated multiwavelength observations of the bright, nearby BL Lac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, V…
Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +246
The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5 σ using the MAGIC telescopes. Together with the…
The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South
J. R. Mullaney, A. Del-Moro, J. Aird +33
We present initial results and the source catalog from the NuSTAR survey of the Extended Chandra Deep Field South (hereafter, ECDFS) - currently the deepest contiguous component of…
The NuSTAR Extragalactic Surveys: First Direct Measurements of the >10 keV X-Ray Luminosity Function for Active Galactic Nuclei at z>0.1
J. Aird, D. M. Alexander, D. R. Ballantyne +34
We present the first direct measurements of the rest-frame 10-40 keV X-ray luminosity function (XLF) of Active Galactic Nuclei (AGNs) based on a sample of 94 sources at 0.1 < z <3,…
NuSTAR catches the unveiling nucleus of NGC 1068
A. Marinucci, S. Bianchi, G. Matt +15
We present a NuSTAR and XMM-Newton monitoring campaign in 2014/2015 of the Compton-thick Seyfert 2 galaxy, NGC 1068. During the August 2014 observation, we detect with NuSTAR a flu…
Locating the gamma-ray emission site in Fermi/LAT blazars. II Multifrequency correlations
V. Ramakrishnan, T. Hovatta, M. Tornikoski +6
In an attempt to constrain and understand the emission mechanism of gamma rays, we perform a cross-correlation analysis of 15 blazars using light curves in millimetre, optical and…
The NuSTAR view of reflection and absorption in NGC 7582
E. Rivers, M. Baloković, P. Arévalo +14
NGC 7582 is a well-studied X-ray bright Seyfert 2 with moderately heavy (~cm), highly variable absorption and strong reflection spectral fea…
The NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background
F. A. Harrison, J. Aird, F. Civano +41
We present the 3-8 keV and 8-24 keV number counts of active galactic nuclei (AGN) identified in the NuSTAR extragalactic surveys. NuSTAR has now resolved 33-39% of the X-ray backgr…
NuSTAR and XMM-Newton Observations of the Hard X-Ray Spectrum of Centaurus A
F. Fuerst, C. Mueller, K. K. Madsen +28
We present simultaneous XMM-Newton and NuSTAR observations spanning 3-78 keV of the nearest radio galaxy, Centaurus A (Cen A). The accretion geometry around the central engine in C…
The hard X-ray emission of the luminous infrared galaxy NGC 6240 as observed by NuSTAR
S. Puccetti, A. Comastri, F. E. Bauer +23
We present a broad-band (~0.3-70 keV) spectral and temporal analysis of NuSTAR observations of the luminous infrared galaxy NGC 6240, combined with archival Chandra, XMM-Newton and…
The Corona of the Broad-Line Radio Galaxy 3C 390.3
Anne Lohfink, Patrick Ogle, Francesco Tombesi +17
We present the results from a joint Suzaku/NuSTAR broad-band spectral analysis of 3C 390.3. The high quality data enables us to clearly separate the primary continuum from the repr…
BAT AGN Spectroscopic Survey II: X-ray Emission and High Ionization Optical Emission Lines
Simon Berney, Michael Koss, Benny Trakhtenbrot +17
We investigate the relationship between X-ray and optical line emission in 340 nearby AGN selected above 10 keV using Swift BAT. We find a weak correlation between the extinction c…
NuSTAR Observations of the Compton-thick Active Galactic Nucleus and Ultraluminous X-ray Source Candidate in NGC 5643
A. Annuar, P. Gandhi, D. M. Alexander +22
We present two NuSTAR observations of the local Seyfert 2 active galactic nucleus (AGN) and an ultraluminous X-ray source (ULX) candidate in NGC 5643. Together with archival data f…
NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars
G. B. Lansbury, P. Gandhi, D. M. Alexander +27
The intrinsic column density (NH) distribution of quasars is poorly known. At the high obscuration end of the quasar population and for redshifts z<1, the X-ray spectra can only be…
Broadband Observations of the Compton-thick Nucleus of NGC 3393
Michael J. Koss, C. Romero-Canizales, L. Baronchelli +16
We present new NuSTAR and Chandra observations of NGC 3393, a galaxy reported to host the smallest separation dual AGN resolved in the X-rays. While past results suggested a 150 pc…
RoboPol: First season rotations of optical polarization plane in blazars
D. Blinov, V. Pavlidou, I. Papadakis +25
We present first results on polarization swings in optical emission of blazars obtained by RoboPol, a monitoring program of an unbiased sample of gamma-ray bright blazars specially…
NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-306
G. Tagliaferri, G. Ghisellini, M. Perri +15
The most powerful blazars are the flat spectrum radio quasars whose emission is dominated by a Compton component peaking between a few hundred keV and a few hundred MeV. We selecte…
Optical polarization map of the Polaris Flare with RoboPol
G. V. Panopoulou, K. Tassis, D. Blinov +26
The stages before the formation of stars in molecular clouds are poorly understood. Insights can be gained by studying the properties of quiescent clouds, such as their magnetic fi…
Determining the covering factor of Compton-thick active galactic nuclei with NuSTAR
M. Brightman, M. Balokovic, D. Stern +19
The covering factor of Compton-thick obscuring material associated with the torus in active galactic nuclei (AGN) is at present best understood through the fraction of sources exhi…
A combined radio and GeV gamma-ray view of the 2012 and 2013 flares of Mrk 421
T. Hovatta, M. Petropoulou, J. L. Richards +8
In 2012 Markarian 421 underwent the largest flare ever observed in this blazar at radio frequencies. In the present study, we start exploring this unique event and compare it to a…