X-ray and ultraviolet observations of the Seyfert galaxy MCG 8-11-11

1990 ◽  
Vol 359 ◽  
pp. 98 ◽  
Author(s):  
A. Treves ◽  
G. Bonelli ◽  
L. Chiappetti ◽  
R. Falomo ◽  
L. Maraschi ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
X Ray ◽  
Ultraviolet Observations

Fractal X-ray time variability and spectral invariance of the Seyfert galaxy NGC5506

Nature ◽  
1987 ◽  
Vol 325 (6106) ◽  
pp. 696-698 ◽  
Author(s):  
Ian McHardy ◽  
Bozena Czerny
Keyword(s):  
Seyfert Galaxy ◽  
Time Variability ◽  
Spectral Invariance ◽  
X Ray

scholarly journals INTEGRAL observations of the GeV blazar PKS 1502+106 and the hard X-ray bright Seyfert galaxy Mkn 841

2011 ◽  
Vol 526 ◽  
pp. A125 ◽  
Author(s):  
E. Pian ◽  
P. Ubertini ◽  
A. Bazzano ◽  
V. Beckmann ◽  
D. Eckert ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
X Ray

scholarly journals NGC 4593 - a bright Seyfert galaxy with variable X-ray emission

1979 ◽  
Vol 188 (1) ◽  
pp. 1P-3P ◽  
Author(s):  
S. J. B. Burnell ◽  
J. L. Culhane
Keyword(s):  
Seyfert Galaxy ◽  
X Ray

scholarly journals X-ray and ultraviolet observations of the dwarf nova VW Hyi in quiescence

2003 ◽  
Vol 346 (4) ◽  
pp. 1231-1241 ◽  
Author(s):  
Dirk Pandel ◽  
France A. Córdova ◽  
Steve B. Howell
Keyword(s):  
X Ray ◽  
Dwarf Nova ◽  
Ultraviolet Observations

scholarly journals Early Science with the Large Millimeter Telescope: An Energy-driven Wind Revealed by Massive Molecular and Fast X-Ray Outflows in the Seyfert Galaxy IRAS 17020+4544

2018 ◽  
Vol 867 (1) ◽  
pp. L11 ◽  
Author(s):  
A. L. Longinotti ◽  
O. Vega ◽  
Y. Krongold ◽  
I. Aretxaga ◽  
M. Yun ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
X Ray

scholarly journals The XMM-Newton/HST View of the Obscuring Outflow in the Seyfert Galaxy Mrk 335 Observed at Extremely Low X-Ray Flux

2019 ◽  
Vol 875 (2) ◽  
pp. 150 ◽  
Author(s):  
Anna Lia Longinotti ◽  
Gerard Kriss ◽  
Yair Krongold ◽  
Karla Z. Arellano-Cordova ◽  
S. Komossa ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
X Ray ◽  
Low X

scholarly journals Regulation of accretion by its outflow in a symbiotic star: the 2016 outflow fast state of MWC 560

2020 ◽  
Vol 492 (3) ◽  
pp. 3107-3127 ◽  
Author(s):  
Adrian B Lucy ◽  
J L Sokoloski ◽  
U Munari ◽  
Nirupam Roy ◽  
N Paul M Kuin ◽  
...  
Keyword(s):  
Symbiotic Star ◽  
Fast State ◽  
Low Velocity ◽  
X Ray ◽  
Broad Absorption Line ◽  
Multi Wavelength ◽  
Order Of Magnitude ◽  
The Stability ◽  
Ultraviolet Observations ◽  
Optical Flux

ABSTRACT How are accretion discs affected by their outflows? To address this question for white dwarfs accreting from cool giants, we performed optical, radio, X-ray, and ultraviolet observations of the outflow-driving symbiotic star MWC 560 (≡V694 Mon) during its 2016 optical high state. We tracked multi-wavelength changes that signalled an abrupt increase in outflow power at the initiation of a months-long outflow fast state, just as the optical flux peaked: (1) an abrupt doubling of Balmer absorption velocities; (2) the onset of a 20 μJy per month increase in radio flux; and (3) an order-of-magnitude increase in soft X-ray flux. Juxtaposing to prior X-ray observations and their coeval optical spectra, we infer that both high-velocity and low-velocity optical outflow components must be simultaneously present to yield a large soft X-ray flux, which may originate in shocks where these fast and slow absorbers collide. Our optical and ultraviolet spectra indicate that the broad absorption-line gas was fast, stable, and dense (≳106.5  cm−3) throughout the 2016 outflow fast state, steadily feeding a lower density (≲105.5 cm−3) region of radio-emitting gas. Persistent optical and ultraviolet flickering indicate that the accretion disc remained intact. The stability of these properties in 2016 contrasts to their instability during MWC 560’s 1990 outburst, even though the disc reached a similar accretion rate. We propose that the self-regulatory effect of a steady fast outflow from the disc in 2016 prevented a catastrophic ejection of the inner disc. This behaviour in a symbiotic binary resembles disc/outflow relationships governing accretion state changes in X-ray binaries.

scholarly journals Modeling time delays in the X-ray spectrum of the Seyfert galaxy MCG-6-30-15

2007 ◽  
Vol 466 (3) ◽  
pp. 865-873 ◽  
Author(s):  
R. W. Goosmann ◽  
B. Czerny ◽  
V. Karas ◽  
G. Ponti
Keyword(s):  
Time Delays ◽  
Seyfert Galaxy ◽  
X Ray

scholarly journals Soft X-ray and ultraviolet observations of MRK 841: implications for the blue bump

1995 ◽  
Vol 273 (1) ◽  
pp. 85-92 ◽  
Author(s):  
K. Nandra ◽  
T. J. Turner ◽  
I. M. George ◽  
A. C. Fabian ◽  
C. Shrader ◽  
...  
Keyword(s):  
X Ray ◽  
Ultraviolet Observations
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