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17 papers · 1 filter
NuSTAR Survey of Obscured Swift/BAT-selected Active Galactic Nuclei: II. Median High-energy Cutoff in Seyfert II Hard X-ray Spectra
M. Baloković, F. A. Harrison, G. Madejski +16
Broadband X-ray spectroscopy of the X-ray emission produced in the coronae of active galactic nuclei (AGN) can provide important insights into the physical conditions very close to…
X-ray redshifts for obscured AGN: a case study in the J1030 deep field
Alessandro Peca, Cristian Vignali, Roberto Gilli +9
We present a procedure to constrain the redshifts of obscured ( cm) Active Galactic Nuclei (AGN) based on low-count statistics X-ray spectra, which can be ado…
The properties of the AGN torus as revealed from a set of unbiased NuSTAR observations
X. Zhao, S. Marchesi, M. Ajello +4
The obscuration observed in active galactic nuclei (AGN) is mainly caused by dust and gas distributed in a torus-like structure surrounding the supermassive black hole (SMBH). Howe…
Investigating the Effect of Galaxy Interactions on AGN Enhancement at
Ekta A. Shah, Jeyhan S. Kartaltepe, Christina T. Magagnoli +30
Galaxy interactions and mergers are thought to play an important role in the evolution of galaxies. Studies in the nearby universe show a higher AGN fraction in interacting and mer…
Accretion History of AGN III: Radiative Efficiency and AGN Contribution to Reionization
Tonima Tasnim Ananna, C. Megan Urry, Ezequiel Treister +6
The cosmic history of supermassive black hole (SMBH) growth is important for understanding galaxy evolution, reionization and the physics of accretion. Recent NuSTAR, Swift-BAT and…
Identifying the 3FHL Catalog. IV. Swift Observations of Unassociated Fermi-LAT 3FHL Sources
Ross Silver, Stefano Marchesi, Lea Marcotulli +3
The Fermi Large Area Telescope (Fermi-LAT) 3FHL catalog is the latest catalog of >10 GeV sources and will remain an important resource for the high-energy community for the foresee…
The web of the Giant: spectroscopic confirmation of a Large Scale Structure around the z=6.31 quasar SDSS J1030+0524
Marco Mignoli, Roberto Gilli, Roberto Decarli +14
We report on the spectroscopic confirmation of a large scale structure around the luminous, z=6.31 QSO SDSS~J1030+0524, that is powered by a billion solar mass black hole. The stru…
Mock catalogs for the extragalactic X-ray sky: simulating AGN surveys with Athena and with the AXIS probe
Stefano Marchesi, Roberto Gilli, Giorgio Lanzuisi +8
We present a series of new, publicly available mock catalogs of X-ray selected active galactic nuclei (AGNs), non-active galaxies, and clusters of galaxies. They are based on up-to…
Measuring Supermassive Black Hole Spin in the Chandra COSMOS-Legacy Survey
Mackenzie Jones, Laura Brenneman, Francesca Civano +2
Spin measurements of supermassive black holes (SMBHs) provide crucial constraints on the accretion processes that power active galactic nuclei (AGN), fuel outflows, and trigger bla…
Co-evolution of black hole accretion and star formation in galaxies up to z=3.5
R. Carraro, G. Rodighiero, P. Cassata +15
We study the co-evolution between the black hole accretion rate (BHAR) and the star formation rate (SFR) in different galaxy life phases: main sequence star-forming galaxies, quies…
Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration?
A. Annuar, D. M. Alexander, P. Gandhi +20
We present 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 lumin…
Gamma-ray emission revealed at the western edge of SNR G344.7-0.1
J. Eagle, S. Marchesi, M. Ajello +2
We report on the investigation of a very high energy (VHE), Galactic gamma-ray source recently discovered at >50GeV using the Large Area Telescope (LAT) on board the Fermi Gamma-Ra…
Morphological and spectral study of 4FGL J1115.1-6118 in the region of the young massive stellar cluster NGC 3603
L. Saha, A. Domínguez, L. Tibaldo +4
We report a detailed study of an unidentified gamma-ray source located in the region of the compact stellar cluster NGC 3603. This is a star-forming region (SFR) powered by a massi…
A broadband X-ray study of a sample of AGNs with [OIII] measured inclinations
X. Zhao, S. Marchesi, M. Ajello +2
In modeling the X-ray spectra of active galactic nuclei (AGNs), the inclination angle is a parameter that can play an important role in analyzing the X-ray spectra of AGN, but it h…
TXS 2116077: A Gamma-ray Emitting Relativistic Jet Hosted in a Galaxy Merger
Vaidehi S. Paliya, Enrique Pérez, Rubén García-Benito +10
What triggers collimated relativistic outflows or jets, from the centers of galaxies remains a fundamental question in astrophysics. The merging of two galaxies has been proposed t…
The deep Chandra survey in the SDSS J1030+0524 field
R. Nanni, R. Gilli, C. Vignali +18
We present the X-ray source catalog for the 479 ks Chandra exposure of the SDSS J1030+0524 field, that is centered on a region that shows the best evidence to date of an overdensit…
NuSTAR perspective on high-redshift MeV blazars
L. Marcotulli, V. Paliya, M. Ajello +7
With bolometric luminosities exceeding erg s, powerful jets and supermassive black holes at their center, MeV blazars are some of the most extreme sources in the U…