The slow heartbeats of an ultra-luminous X-ray source in NGC 3621

Abstract

We report on the results of X-ray observations of 4XMM J111816.0-324910, a transient ultra-luminous X-ray source located in the galaxy NGC 3621. This system is characterised by a transient nature and marked variability with characteristic time-scale of ~3500 s, differently from other ULXs, which in the vast majority show limited intra-observation variability. Such a behaviour is very reminiscent of the so-called heartbeats sometimes observed in the Galactic black hole binary GRS 1915+105, where the variability time-scale is ~10-1000 s. We study the spectral and timing properties of this object and find that overall, once the differences in the variability time-scales are taken into account, they match quite closely those of both GRS 1915+105, and of a number of objects showing heartbeats in their light-curves, including a confirmed neutron star and a super-massive black hole powering an active galactic nucleus. We investigate the nature of the compact object in 4XMM J111816.0-324910 by searching for typical neutron star signatures and by attempting a mass estimate based on different methods and assumptions. Based on the current available data, we are not able to unambiguously determine the nature of the accreting compact object responsible for the observed phenomenology.

arXiv commentAccepted for publication in ApJ. 13 pages, 6 figures

References in corpus (30)

• On the Absorption of X-rays in the Interstellar Medium
• Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry
• The Black Hole Mass Distribution in the Galaxy
• Cosmicflows-2: The Data
• Ultraluminous X-Ray Sources
• An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907
• The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
• Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
• A Parallax Distance to the Microquasar GRS 1915+105 and a Revised Estimate of its Black Hole Mass
• The ultraluminous state revisited: fractional variability and spectral shape as diagnostics of super-Eddington accretion
• A spectral-timing model for ULXs in the super-critical regime
• The faint "heartbeats" of IGR J17091-3624: an exceptional black-hole candidate
• The Physics of the 'Heartbeat' State of GRS 1915+105
• The Discovery of an Active Galactic Nucleus in the Late-type Galaxy NGC 3621: Spitzer Spectroscopic Observations
• A new technique for the detection of periodic signals in ``coloured'' power spectra
• Dynamical Constraints on The Masses of the Nuclear Star Cluster and Black Hole in the Late-Type Spiral Galaxy NGC 3621
• Lense-Thirring precession in ULXs as a possible means to constrain the neutron star equation-of-state
• Links between quasi-periodic oscillations and accretion states in neutron star low mass X-ray binaries
• On the turbulent $\alpha$-disks and the intermittent activity in AGN
• A Chandra view of NGC 3621: a bulgeless galaxy hosting an AGN in its early phase?
• Interplay between heartbeat oscillations and wind outflow in microquasar IGR J17091-3624
• An Atlas of Exotic Variability in IGR J17091-3624: A Comparison with GRS 1915+105
• A population study of type II bursts in the Rapid Burster
• Discovery of GRS 1915+105 variability patterns in the Rapid Burster
• Soft Extragalactic X-Ray Binaries at the Eddington Threshold
• Science with the EXTraS Project: Exploring the X-ray Transient and variable Sky
• The Ultraluminous X-ray sources population of the galaxy NGC 7456
• A non-linear mathematical model for the X-ray variability classes of the microquasar GRS 1915+105 -- II: transition and swaying classes
• A statistical analysis of the "heartbeat" behaviour of GRS 1915+105
• A non-linear mathematical model for the X-ray variability classes of the microquasar GRS 1915+105 -- I: quiescent, spiking states and QPOs

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