Active galaxy 4U1344-60: Did the relativistic line disappear?

3Citations
Citations of this article
7Readers
Mendeley users who have this article in their library.

Abstract

Context. X-ray bright active galactic nuclei represent a unique astrophysical laboratory for studying accretion physics around super-massive black holes. Aims. 4U 1344-60 is a bright Seyfert galaxy which revealed relativistic reflection features in the archival XMM-Newton observation. Methods. We present the spectroscopic results of new data obtained with the Suzaku satellite and compare them with the previous XMM-Newton observation. Results. The X-ray continuum of 4U 1344-60 can be well described by a power-law component with the photon index 1.7 modified by a fully and a partially covering local absorbers. We measured a substantial decrease of the fraction of the partially absorbed radiation from around 45% in the XMM-Newton observation to less than 10% in the Suzaku observation while the power-law slope remains constant within uncertainties. The iron line in the Suzaku spectrum is relatively narrow, σ = (0.08 ± 0.02) keV, without any suggestion for relativistic broadening. Regarding this, we interpret the iron line in the archival XMM-Newton spectrum as a narrow line of the same width plus an additional red-shifted emission around 6.1keV. Conclusions. No evidence of the relativistic reflection is present in the Suzaku spectra. The detected red-shifted iron line during the XMM-Newton observation could be a temporary feature either due to locally enhanced emission or decreased ionisation in the innermost accretion flow. © 2012 ESO.

Cite

CITATION STYLE

APA

Svoboda, J., Bianchi, S., Guainazzi, M., Matt, G., Piconcelli, E., Karas, V., & Dovčiak, M. (2012). Active galaxy 4U1344-60: Did the relativistic line disappear? Astronomy and Astrophysics, 545. https://doi.org/10.1051/0004-6361/201219500

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free