Zobrazeno 1 - 10
of 24
pro vyhledávání: '"R. V. Vasudevan"'
Autor:
David R. Ballantyne, Michael Parker, Andrew C. Fabian, Fiona A. Harrison, Ciro Pinto, Douglas J. K. Buisson, Finn Erland Christensen, Daniel Stern, S. E. Boggs, Erin Kara, C. J. Hailey, Duncan Farrah, W. W. Zhang, W. W. Craig, R. V. Vasudevan, Claudio Ricci, Anne M. Lohfink, Dom Walton
Publikováno v:
Buisson, D J K, Parker, M L, Kara, E, Vasudevan, R V, Lohfink, A M, Pinto, C, Fabian, A C, Ballantyne, D R, Boggs, S E, Christensen, F E, Craig, W W, Farrah, D, Hailey, C J, Harrison, F A, Ricci, C, Stern, D, Walton, D J & Zhang, W W 2018, ' NuSTAR observations of Mrk 766: distinguishing reflection from absorption ', Monthly Notices of the Royal Astronomical Society, vol. 480, no. 3, pp. 3689-3701 . https://doi.org/10.1093/mnras/sty2081
We present two new NuSTAR observations of the narrow line Seyfert 1 (NLS1) galaxy Mrk 766 and give constraints on the two scenarios previously proposed to explain its spectrum and that of other NLS1s: relativistic reflection and partial covering. The
Autor:
Andrew C. Fabian, Erin Kara, Dan R. Wilkins, Abderahmen Zoghbi, Chia-Ying Chiang, Giovanni Miniutti, Luigi C. Gallo, Anne M. Lohfink, Matthew J. Middleton, Michael Parker, Javier A. García, Jon M. Miller, Ciro Pinto, R. V. Vasudevan, Thomas Dauser, Christopher S. Reynolds, A. L. King, Phil Uttley, Edward M. Cackett, Barbara De Marco, Douglas J. K. Buisson, Dominic J. Walton, Fiona A. Harrison, William Alston
Publikováno v:
Nature, 543(7643), 83-86. Nature Publishing Group
Active galactic nucleus (AGN) feedback is the process by which supermassive black holes in the centres of galaxies may moderate the growth of their hosts. Gas outflows from supermassive black holes release huge quantities of energy into the interstel
Autor:
Thomas Dauser, Andrew C. Fabian, Luigi C. Gallo, Christopher S. Reynolds, R. V. Vasudevan, James Aird
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 458:2012-2023
The Cosmic X-ray Background (CXB) is the total emission from past accretion activity onto supermassive black holes in active galactic nuclei (AGN) and peaks in the hard X-ray band (30 keV). In this paper, we identify a significant selection effect op
Autor:
Anne M. Lohfink, Erin Kara, R. V. Vasudevan, Michael Parker, Christopher S. Reynolds, Andrew C. Fabian
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 451:4375-4383
The focusing optics of NuSTAR have enabled high signal-to-noise ratio spectra to be obtained from many X-ray bright active galactic nuclei (AGN) and galactic black hole binaries (BHB). Spectral modelling then allows robust characterization of the spe
Autor:
C. MacMackin, A. C. Fabian, R. V. Vasudevan, Francesca Panessa, Edward M. Cackett, Luigi C. Gallo
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 433:421-433
1ES 1927+654 is an active galactic nucleus (AGN) that appears to defy the unification model. It exhibits a type-2 optical spectrum, but possesses little X-ray obscuration. XMM-Newton and Suzaku observations obtained in 2011 are used to study the X-ra
Autor:
Margaret Trippe, Lisa M. Winter, Richard F. Mushotzky, A. C. Fabian, R. V. Vasudevan, Marcio Melendez
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 431:3127-3138
The Effective Eddington Limit for dusty gas surrounding AGN is lower than the canonical Eddington limit for hydrogen gas. Previous results from the Swift/BAT 9-month catalogue suggested that in the overwhelming majority of local AGN, the dusty absorb
Autor:
Dominic J. Walton, R. V. Vasudevan, Michael Parker, Wolfram Kollatschny, Maria Santos-Lleo, Fiona A. Harrison, Dirk Grupe, M. Zetzl, S. Komossa, N. Schartel, P. M. Rodriguez-Pascual, Andrew C. Fabian
We report the detection of high-amplitude X-ray flaring of the AGN HE 1136-2304, which is accompanied by a strong increase in the flux of the broad Balmer lines, changing its Seyfert type from almost type 2 in 1993 down to 1.5 in 2014. HE 1136-2304 w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24bb4463269edb3ef4f55bbec41aa71f
http://arxiv.org/abs/1606.04955
http://arxiv.org/abs/1606.04955
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 419:2529-2544
The accretion efficiency for individual black holes is very difficult to determine accurately. There are many factors that can influence each step of the calculation, such as the dust and host galaxy contribution to the observed luminosity, the black
Autor:
Franz E. Bauer, W. N. Brandt, Yongquan Xue, S. I. Raimundo, Bin Luo, David M. Alexander, Andrew C. Fabian, R. V. Vasudevan
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 408:1714-1720
The presence of absorbing gas around the central engine of active galactic nuclei (AGN) is a common feature of these objects. Recent work has looked at the effect of the dust component of the gas, and how it enhances radiation pressure such that dust
Autor:
Giovanni Miniutti, R. V. Vasudevan, Randy R. Ross, Phil Uttley, Yasuo Tanaka, Abderahmen Zoghbi, Andrew C. Fabian, Gabriele Ponti, Luigi C. Gallo, W. N. Brandt
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 406:2591-2604
We present a spectral variability study of the XMM-Newton and Suzaku observations of one of the most extreme Narrow Line Seyfert 1 galaxies, IRAS13224-3809. The X-ray spectrum is characterized by two main peculiar features, i) a strong soft excess wi