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A search for periodicities from a ULX in the LINER galaxy NGC 4736
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Date
2014-07-01
Author
Avdan, Hasan
Avdan, Senay Kayaci
AKYÜZ, AYSUN
Balman, Şölen
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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We report our findings on a new quasi-periodic oscillation (QPO) and a long period from the ultraluminous X-ray source (ULX) X-2 in nearby galaxy NGC 4736 based on the Chandra and XMM-Newton archival data. To examine the timing properties, power density spectra of the source have been obtained using Fast Fourier Transform. Also the spectral parameters of the source have been calculated by obtaining and fitting the energy spectra. Power density spectrum of this source reveals a QPO peak at with an fractional rms variability of 16 % using the Chandra data (in the year 2000-lower state of the source). The XMM-Newton data analysis indicates a peak at with a fractional rms variation of 5 % (in the year 2006-higher state of the source). These recovered QPOs overlap within errors and may be the same oscillation. In addition, we detect a long periodicity or a QPO in the Chandra data of about (5.2 +/- 2.0)x10(-5) Hz (similar to 5.4 h) over 3 sigma confidence level. If this is a QPO, it is the lowest QPO detected from a ULX. The mass of the compact object in ULX X-2 is estimated using the Eddington luminosity and a disk blackbody model in the range (10-80) M-circle dot.
Subject Keywords
Galaxies: individual (NGC 4736)
,
X-rays: binaries
,
Stars: oscillations
,
Black hole physics
URI
https://hdl.handle.net/11511/51805
Journal
ASTROPHYSICS AND SPACE SCIENCE
DOI
https://doi.org/10.1007/s10509-014-1888-9
Collections
Department of Physics, Article