Zobrazeno 1 - 10
of 7 660
pro vyhledávání: '"Zoghbi, A."'
Autor:
Xiang, Xin, Miller, Jon M., Zoghbi, Abderahmen, Reynolds, Mark T., Bogensberger, David, Dai, Lixin, Draghis, Paul A., Drake, Jeremy J., Godet, Olivier, Irwin, Jimmy A., Miller, Michael C., Mockler, Brenna E., Saxton, Richard, Webb, Natalie
Tidal disruption events (TDEs) can potentially probe low-mass black holes in host galaxies that might not adhere to bulge or stellar-dispersion relationships. At least initially, TDEs can also reveal super-Eddington accretion. X-ray spectroscopy can
Externí odkaz:
http://arxiv.org/abs/2407.04684
Autor:
Gediman, B., Miller, J. M., Zoghbi, A., Draghis, P., Arzoumanian, Z., Brandt, W. N ., Gendreau, K.
We report on a study of the narrow Fe K$\alpha$ line and reflection spectrum in the well-known Seyfert-2 AGN, NGC 4388. X-ray spectra summed from two extensive NICER monitoring campaigns, separated by years, show strong evidence of variation in the d
Externí odkaz:
http://arxiv.org/abs/2403.00926
Iron K$\alpha$ (Fe K$\alpha$) emission is observed ubiquitously in AGN, and it is a powerful probe of their circumnuclear environment. Examinations of the emission line play a pivotal role in understanding the disk geometry surrounding the black hole
Externí odkaz:
http://arxiv.org/abs/2312.16354
Autor:
Bollemeijer, Niek, Uttley, Phil, Basak, Arkadip, Ingram, Adam, Eijnden, Jakob van den, Alabarta, Kevin, Altamirano, Diego, Arzoumanian, Zaven, Buisson, Douglas J. K., Fabian, Andrew C., Ferrara, Elizabeth, Gendreau, Keith, Homan, Jeroen, Kara, Erin, Markwardt, Craig, Remillard, Ronald A., Sanna, Andrea, Steiner, James F., Tombesi, Francesco, Wang, Jingyi, Wang, Yanan, Zoghbi, Abderahmen
In X-ray observations of hard state black hole X-ray binaries, rapid variations in accretion disc and coronal power-law emission are correlated and show Fourier-frequency-dependent time lags. On short (~0.1 s) time-scales, these lags are thought to b
Externí odkaz:
http://arxiv.org/abs/2312.09835
Autor:
Zak, Miranda K., Miller, Jon M., Behar, Ehud, Brandt, William N., Brenneman, Laura, Draghis, Paul A., Kammoun, Elias, Koss, Michael J., Reynolds, Mark T., Zoghbi, Abderahmen
Markarian 817 is a bright and variable Seyfert-1.2 active galactic nucleus (AGN). X-ray monitoring of Mrk 817 with the Neil Gehrels Swift Observatory in 2022 revealed that the source flux had declined to a lower level than recorded at any prior point
Externí odkaz:
http://arxiv.org/abs/2312.06487
Autor:
Draghis, Paul A., Miller, Jon M., Costantini, Elisa, Gallo, Luigi C., Reynolds, Mark, Tomsick, John A., Zoghbi, Abderahmen
Publikováno v:
The Astrophysical Journal, 969:40 (20pp), 2024 July 1
We extend our recent work on black hole spin in X-ray binary systems to include an analysis of 189 archival NuSTAR observations from 24 sources. Using self-consistent data reduction pipelines, spectral models, and statistical techniques, we report an
Externí odkaz:
http://arxiv.org/abs/2311.16225
Autor:
Kammoun, E., Lohfink, A. M., Masterson, M., Wilkins, D. R., Zhao, X., Baloković, M., Boorman, P. G., Connors, R. M. T., Coppi, P., Fabian, A. C., García, J. A., Madsen, K. K., Cavero, N. Rodriguez, Sridhar, N., Stern, D., Tomsick, J., Wevers, T., Walton, D. J., Bianchi, S., Buchner, J., Civano, F., Lanzuisi, G., Mallick, L., Matt, G., Merloni, A., Nardini, E., Piotrowska, J. M., Ricci, C., Wong, K. -W., Zoghbi, A., Collaboration, the HEX-P
The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission, commonly described by a power law with a high-energy cutoff, is sugg
Externí odkaz:
http://arxiv.org/abs/2311.04679
Autor:
Zoghbi, A., Miller, J. M.
The soft excess is a significant emission component in the Soft (<1 keV) X-ray spectra of many AGN. It has been explained by disk reflection, a warm corona and other models. Understanding its origin is crucial for the energy budget of AGN emission, a
Externí odkaz:
http://arxiv.org/abs/2309.10247
Autor:
Miller, J. M., Mockler, B., Ramirez-Ruiz, E., Draghis, P. A., Drake, J. J., Raymond, J., Reynolds, M. T., Xiang, X., Yun, S. -B., Zoghbi, A.
The proximity and duration of the tidal disruption event (TDE) ASASSN-14li led to the discovery of narrow, blue-shifted absorption lines in X-rays and UV. The gas seen in X-ray absorption is consistent with bound material close to the apocenter of el
Externí odkaz:
http://arxiv.org/abs/2308.10964
Autor:
Draghis, Paul A., Miller, Jon M., Brumback, McKinley C., Fabian, Andrew C., Tomsick, John A., Zoghbi, Abderahmen
The black hole candidate XTE J2012+381 underwent an outburst at the end of 2022. We analyzed 105 NICER observations and 2 NuSTAR observations of the source during the outburst. The NuSTAR observations of the $M \sim10M_\odot$ black hole indicate clea
Externí odkaz:
http://arxiv.org/abs/2307.06988