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Title: SOFT TIME LAGS IN THE X-RAY EMISSION OF Mrk 1040

Abstract

Temporal analysis of X-ray binaries and active galactic nuclei (AGNs) have shown that hard X-rays react to variation of soft ones after a time delay. The opposite trend, or soft lag, has only been seen in a few rare quasi-periodic oscillations in X-ray binaries and recently for the AGN 1H 0707-495, on short timescales of {approx}10{sup 3} s. Here, we report analysis of an XMM-Newton observation of Mrk 1040, which reveals that on the dominant variability timescale of {approx}10{sup 4} s, the source seems to exhibit soft lags. If the lags are frequency independent, they could be due to reverberation effects of a relativistically blurred reflection component responding to a varying continuum. Alternatively, they could be due to Comptonization delays in the case when high-energy photons impinge back on the soft photon source. Both models can be verified and their parameters tightly constrained, because they will need to predict the photon spectrum, rms variability, and time lag as a function of energy. A successful application of either model will provide unprecedented information on the radiative process, geometry, and more importantly the size of the system, which in turn may provide a stringent test of strong general relativistic effects.

Authors:
;  [1]; ;  [2]
  1. Department of Physics, DDU Gorakhpur University, Gorakhpur 273009 (India)
  2. Inter-University Centre for Astronomy and Astrophysics, Pune 411007 (India)
Publication Date:
OSTI Identifier:
21562503
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 736; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/736/2/L37; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXIES; GALAXY NUCLEI; HARD X RADIATION; OSCILLATIONS; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; RADIATIONS; X RADIATION

Citation Formats

Tripathi, Shruti, Rastogi, Shantanu, Misra, Ranjeev, and Dewangan, Gulab, E-mail: stripathi@iucaa.ernet.in, E-mail: rmisra@iucaa.ernet.in. SOFT TIME LAGS IN THE X-RAY EMISSION OF Mrk 1040. United States: N. p., 2011. Web. doi:10.1088/2041-8205/736/2/L37.
Tripathi, Shruti, Rastogi, Shantanu, Misra, Ranjeev, & Dewangan, Gulab, E-mail: stripathi@iucaa.ernet.in, E-mail: rmisra@iucaa.ernet.in. SOFT TIME LAGS IN THE X-RAY EMISSION OF Mrk 1040. United States. doi:10.1088/2041-8205/736/2/L37.
Tripathi, Shruti, Rastogi, Shantanu, Misra, Ranjeev, and Dewangan, Gulab, E-mail: stripathi@iucaa.ernet.in, E-mail: rmisra@iucaa.ernet.in. Mon . "SOFT TIME LAGS IN THE X-RAY EMISSION OF Mrk 1040". United States. doi:10.1088/2041-8205/736/2/L37.
@article{osti_21562503,
title = {SOFT TIME LAGS IN THE X-RAY EMISSION OF Mrk 1040},
author = {Tripathi, Shruti and Rastogi, Shantanu and Misra, Ranjeev and Dewangan, Gulab, E-mail: stripathi@iucaa.ernet.in, E-mail: rmisra@iucaa.ernet.in},
abstractNote = {Temporal analysis of X-ray binaries and active galactic nuclei (AGNs) have shown that hard X-rays react to variation of soft ones after a time delay. The opposite trend, or soft lag, has only been seen in a few rare quasi-periodic oscillations in X-ray binaries and recently for the AGN 1H 0707-495, on short timescales of {approx}10{sup 3} s. Here, we report analysis of an XMM-Newton observation of Mrk 1040, which reveals that on the dominant variability timescale of {approx}10{sup 4} s, the source seems to exhibit soft lags. If the lags are frequency independent, they could be due to reverberation effects of a relativistically blurred reflection component responding to a varying continuum. Alternatively, they could be due to Comptonization delays in the case when high-energy photons impinge back on the soft photon source. Both models can be verified and their parameters tightly constrained, because they will need to predict the photon spectrum, rms variability, and time lag as a function of energy. A successful application of either model will provide unprecedented information on the radiative process, geometry, and more importantly the size of the system, which in turn may provide a stringent test of strong general relativistic effects.},
doi = {10.1088/2041-8205/736/2/L37},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 736,
place = {United States},
year = {2011},
month = {8}
}