279 citations · 1.7k across the 51 of their papers we have counts for
11 papers · 1 filter
Pulse profile variations in the accreting X-ray pulsar Vela X-1
V. Madurga-Favieres, A. Martin-Carrillo, C. M. Diez +7
Vela X-1 is a well-studied accreting X-ray pulsar, with a distinctive pulse profile that has been found to be very similar in different observations spread out over decades. On the…
NGC 4388: A Test Case for Relativistic Disk Reflection and Fe K Fluorescence Features
Tahir Yaqoob, P. Tzanavaris, S. LaMassa
We present a new analysis of the Suzaku X-ray spectrum of the Compton-thin Seyfert 2 galaxy NGC 4388. The spectrum above 2 keV can be described by a remarkably simple and rat…
The Complex X-ray Obscuration Environment in the Radio Loud Type 2 Quasar 3C 223
Stephanie M. LaMassa, Tahir Yaqoob, Panayiotis Tzanavaris +4
3C 223 is a radio loud, Type 2 quasar at with an intriguing XMM-Newton spectrum that implicated it as a rare, Compton-thick ( cm$^…
Are Compton-thin AGNs Globally Compton Thin?
P. Tzanavaris, T. Yaqoob, S. LaMassa +2
We select eight nearby AGNs which, based on previous work, appear to be Compton-thin in the line of sight. We model with MYTORUS their broadband X-ray spectra from 20 individual ob…
NuSTAR Uncovers an Extremely Local Compton-thick AGN in NGC 4968
Stephanie M. LaMassa, Tahir Yaqoob, Peter G. Boorman +5
We present the analysis of Chandra and NuSTAR spectra of NGC 4968, a local (D44 Mpc) 12m-selected Seyfert 2 galaxy, enshrouded within Compton-thick layers of obscuring gas…
Broad Band X-ray Constraints on the Accreting Black Hole in Quasar 4C 74.26
P. Tzanavaris, T. Yaqoob, S. LaMassa +2
X-ray data for quasar 4C 74.26 have previously been modeled with a broad Fe K emission line and reflection continuum originating in the inner part of the accretion disk around t…
High-Energy Photon and Particle Effects onExoplanet Atmospheres and Habitability
Jeremy J. Drake, Julián D. Alvarado-Gómez, Vladimir Airapetian +41
It is now recognized that energetic stellar photon and particle radiation evaporates and erodes planetary atmospheres and controls upper atmospheric chemistry. Key exoplanet host s…
Astro 2020 Science White Paper: Time Domain Studies of Neutron Star and Black Hole Populations: X-ray Identification of Compact Object Types
N. Vulic, A. E. Hornschemeier, V. Antoniou +16
What are the most important conditions and processes governing the growth of stellar-origin compact objects? The identification of compact object type as either black hole (BH) or…
Supermassive Black Hole Spin and Reverberation
A. Zoghbi, D. R. Wilkins, L. Brenneman +7
X-ray reverberation mapping has emerged as a powerful probe of microparsec scales around AGN, and with high sensitivity detectors, its full potential in echo-mapping the otherwise…
Some Like It Hot: Linking Diffuse X-ray Luminosity, Baryonic Mass, and Star Formation Rate in Compact Groups of Galaxies
Tyler D. Desjardins, Sarah C. Gallagher, Ann E. Hornschemeier +6
We present an analysis of the diffuse X-ray emission in 19 compact groups of galaxies (CGs) observed with Chandra. The hottest, most X-ray luminous CGs agree well with the galaxy c…
X-ray Binary Evolution Across Cosmic Time
Tassos Fragos, Bret Lehmer, Michael Tremmel +8
High redshift galaxies permit the study of the formation and evolution of X-ray binary populations on cosmological timescales, probing a wide range of metallicities and star-format…