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All Outputs (8)

NuSTAR Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration? (2020)
Journal Article
Zappacosta, L., Stern, D., Ricci, C., Nardini, E., Masini, A., Marchesi, S., …Annuar, A. (2020). NuSTAR Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration?. Monthly Notices of the Royal Astronomical Society, 497(1), 229-245. https://doi.org/10.1093/mnras/staa1820

We present NuSTAR observations of four active galactic nuclei (AGN) located within 15 Mpc. These AGN, namely ESO 121-G6, NGC 660, NGC 3486 and NGC 5195, have observed X-ray luminosities of L2-10 keV, obs ≲ 1039 erg s−1, classifying them as low lumino... Read More about NuSTAR Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration?.

The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV (2017)
Journal Article
Lansbury, G., Alexander, D., Aird, J., Gandhi, P., Stern, D., Koss, M., …Zappacosta, L. (2017). The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV. Astrophysical Journal, 846(1), Article 20. https://doi.org/10.3847/1538-4357/aa8176

We identify sources with extremely hard X-ray spectra (i.e., with photon indices of ${\rm{\Gamma }}\lesssim 0.6$) in the 13 deg2 NuSTAR serendipitous survey, to search for the most highly obscured active galactic nuclei (AGNs) detected at $\gt 10\,\m... Read More about The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV.

A New Compton-thick AGN in our Cosmic Backyard: Unveiling the Buried Nucleus in NGC 1448 with NuSTAR (2017)
Journal Article
Annuar, A., Alexander, D., Gandhi, P., Lansbury, G., Asmus, D., Ballantyne, D., …Zhang, W. (2017). A New Compton-thick AGN in our Cosmic Backyard: Unveiling the Buried Nucleus in NGC 1448 with NuSTAR. Astrophysical Journal, 836(2), Article 165. https://doi.org/10.3847/1538-4357/836/2/165

NGC 1448 is one of the nearest luminous galaxies (L8−1000μm> 109L⊙) to ours (z = 0.00390), and yet the active galactic nucleus (AGN) it hosts was only recently discovered, in 2009. In this paper, we present an analysis of the nuclear source across th... Read More about A New Compton-thick AGN in our Cosmic Backyard: Unveiling the Buried Nucleus in NGC 1448 with NuSTAR.

The NuSTAR Serendipitous Survey: The 40-month Catalog and the Properties of the Distant High-Energy X-ray Source Population (2017)
Journal Article
Lansbury, G., Stern, D., Aird, J., Alexander, D., Fuentes, C., Harrison, F., …Zhang, W. (2017). The NuSTAR Serendipitous Survey: The 40-month Catalog and the Properties of the Distant High-Energy X-ray Source Population. Astrophysical Journal, 836(1), Article 99. https://doi.org/10.3847/1538-4357/836/1/99

We present the first full catalog and science results for the NuSTAR serendipitous survey. The catalog incorporates data taken during the first 40 months of NuSTAR operation, which provide ~20Ms of effective exposure time over 331 fields, with an are... Read More about The NuSTAR Serendipitous Survey: The 40-month Catalog and the Properties of the Distant High-Energy X-ray Source Population.

IC 3639 - A new bona fide Compton-thick AGN unveiled by NuSTAR (2016)
Journal Article
Boorman, P., Gandhi, P., Alexander, D., Annuar, A., Ballantyne, D., Bauer, F., …Zhang, W. (2016). IC 3639 - A new bona fide Compton-thick AGN unveiled by NuSTAR. Astrophysical Journal, 833(2), 245-262. https://doi.org/10.3847/1538-4357/833/2/245

We analyze high-quality NuSTAR observations of the local (z = 0.011) Seyfert 2 active galactic nucleus (AGN) IC 3639, in conjunction with archival Suzaku and Chandra data. This provides the first broadband X-ray spectral analysis of the source, spann... Read More about IC 3639 - A new bona fide Compton-thick AGN unveiled by NuSTAR.

Hard X-ray emission of the luminous infrared galaxy NGC 6240 as observed by NuSTAR (2016)
Journal Article
Puccetti, S., Comastri, A., Bauer, F., Brandt, W., Fiore, F., Harrison, F., …Zhang, W. (2016). Hard X-ray emission of the luminous infrared galaxy NGC 6240 as observed by NuSTAR. Astronomy & Astrophysics, 585, Article A157. https://doi.org/10.1051/0004-6361/201527189

We present a broadband (~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 BeppoSAX data. NGC 6240 is a galaxy in a relatively early merger state... Read More about Hard X-ray emission of the luminous infrared galaxy NGC 6240 as observed by NuSTAR.

NuSTAR Observations of the Compton-thick Active Galactic Nucleus and Ultraluminous X-Ray Source Candidate in NGC 5643 (2015)
Journal Article
Annuar, A., Gandhi, P., Alexander, D., Lansbury, G., Arevalo, P., Ballantyne, D., …Zhang, W. (2015). NuSTAR Observations of the Compton-thick Active Galactic Nucleus and Ultraluminous X-Ray Source Candidate in NGC 5643. Astrophysical Journal, 815(1), Article 36. https://doi.org/10.1088/0004-637x/815/1/36

We present two Nuclear Spectroscopic Telescope Array (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 from Chandra, XMM-Newton, and S... Read More about NuSTAR Observations of the Compton-thick Active Galactic Nucleus and Ultraluminous X-Ray Source Candidate in NGC 5643.

NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars (2015)
Journal Article
Lansbury, G., Gandhi, P., Alexander, D., Assef, R., Aird, J., Annuar, A., …Zhang, W. (2015). NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars. Astrophysical Journal, 809(2), Article 115. https://doi.org/10.1088/0004-637x/809/2/115

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 reliably characterized using broad-band measurements which extend to... Read More about NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars.