The long term X-ray time lags of NGC 4051
The long term X-ray time lags of NGC 4051
We present the long term, frequency-dependent, X-ray time lags of the Seyfert galaxy NGC 4051. We used Rossi X-ray Timing Explorer(RXTE) light curves in the 2–4, 4–7, and 7–10 keV bands and we measured the time lags at 10−7–10−6 Hz. This is the lowest frequency range that active galactic nuclei time lags have ever been measured. The variations in the higher energy bands are delayed with respect to the variations we observe at 2–4 keV, in agreement with the time lags at high frequencies. When we combine our results with those from the model fitting of the time lags at higher frequencies we find that that the X-ray hard lags in NGC 4051 follow a power law of slope ∼−1 over a broad frequency range, from ∼10−7 to ∼10−3 Hz. This is consistent with the time lags of Cyg X–1, a result which further supports the analogy between active galaxies and Galactic X-ray black hole binaries.
black hole physics – galaxies: active – X-rays: galaxies.
1454-1459
Papadakis, I.E.
687d9f55-f0f8-4ec4-b347-03b812c49432
Rigas, A
03fdb101-eb5b-4382-b912-4a0130028480
Markowitz, A
30976cf7-276f-4beb-9346-0646f14e4ce6
McHardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e
Papadakis, I.E.
687d9f55-f0f8-4ec4-b347-03b812c49432
Rigas, A
03fdb101-eb5b-4382-b912-4a0130028480
Markowitz, A
30976cf7-276f-4beb-9346-0646f14e4ce6
McHardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e
Papadakis, I.E., Rigas, A, Markowitz, A and McHardy, Ian
(2019)
The long term X-ray time lags of NGC 4051.
Monthly Notices of the Royal Astronomical Society, .
(doi:10.1093/mnras/stz489).
Abstract
We present the long term, frequency-dependent, X-ray time lags of the Seyfert galaxy NGC 4051. We used Rossi X-ray Timing Explorer(RXTE) light curves in the 2–4, 4–7, and 7–10 keV bands and we measured the time lags at 10−7–10−6 Hz. This is the lowest frequency range that active galactic nuclei time lags have ever been measured. The variations in the higher energy bands are delayed with respect to the variations we observe at 2–4 keV, in agreement with the time lags at high frequencies. When we combine our results with those from the model fitting of the time lags at higher frequencies we find that that the X-ray hard lags in NGC 4051 follow a power law of slope ∼−1 over a broad frequency range, from ∼10−7 to ∼10−3 Hz. This is consistent with the time lags of Cyg X–1, a result which further supports the analogy between active galaxies and Galactic X-ray black hole binaries.
Text
The long term X-ray time-lags of NGC 4051
- Accepted Manuscript
More information
Accepted/In Press date: 12 February 2019
e-pub ahead of print date: 17 February 2019
Keywords:
black hole physics – galaxies: active – X-rays: galaxies.
Identifiers
Local EPrints ID: 432024
URI: http://eprints.soton.ac.uk/id/eprint/432024
ISSN: 1365-2966
PURE UUID: e3e19b33-175a-439a-9d4e-1c75340e66d7
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Date deposited: 26 Jun 2019 16:30
Last modified: 16 Mar 2024 02:17
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Contributors
Author:
I.E. Papadakis
Author:
A Rigas
Author:
A Markowitz
Author:
Ian McHardy
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