A Major X-ray Outburst from an Ultraluminous X-Ray Source in M82

Abstract

We detected a major X-ray outburst from M82 with a duration of 79 days, an average flux of 5E-11 erg cm^-2 s^-1 in the 2-10 keV band, and strong variability. The X-ray spectrum remained hard throughout the outburst. We obtained a Chandra observation during the outburst that shows that the emission arises from the ultraluminous X-ray source X41.4+60. This source has an unabsorbed flux of (5.4 +/- 0.2)E-11 erg cm^-2 s^-1 in the 0.3-8 keV band, equivalent to an isotropic luminosity of 8.5E40 erg/s. The spectrum is adequately fitted with an absorbed power-law with a photon index of 1.55 +/- 0.05. This photon index is very similar to the value of 1.61 +/- 0.06 measured previously while the flux was (2.64 +/- 0.14)E-11 erg cm^-2 s^-1. Thus, the source appears to remain in the hard state even at the highest flux levels observed. The X-ray spectral and timing data available for X41.4+60 are consistent with the source being in a luminous hard state and a black hole mass in the range of one to a few thousand solar masses.

arXiv commentto appear in ApJ, 7 pages

References in corpus (34)

• X-ray Properties of Black-Hole Binaries
• A fundamental plane of black hole activity
• An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
• The formation of massive black holes through collision runaway in dense young star clusters
• The Nature of Accreting Black Holes in Nearby Galaxy Nuclei
• The Nature of Ultra-Luminous Compact X-Ray Sources in Nearby Spiral Galaxies
• The evolution of the timing properties of the black-hole transient GX 339-4 during its 2002/2003 outburst
• XMM-Newton observations of the brightest Ultraluminous X-ray sources
• GX 339-4: the distance, state transitions, hysteresis and spectral correlations
• Chandra High-Resolution Camera Observations of the Luminous X-Ray Source in the Starburst Galaxy M82
• The Hard X-ray Spectrum as a Probe for Black-Hole Growth in Radio-Quiet Active Galactic Nuclei
• Discovery of X-ray QPOs from an Ultra-luminous X-ray Source in M82: Evidence Against Beaming
• Kinematic Masses of Super Star Clusters in M82 from High-Resolution Near-Infrared Spectroscopy
• Non-Nuclear Hyper/Ultraluminous X-Ray Sources in the Starbursting Cartwheel Ring Galaxy
• Black Hole Mass of the Ultraluminous X-ray source M82 X-1
• Spectral evolution of the microquasar XTE J1550-564 over its entire 2000 outburst
• A 62 Day X-Ray Periodicity and an X-Ray Flare from the Ultraluminous X-Ray Source in M82
• Displacement of X-Ray Sources from Star Clusters in Starburst Galaxies
• XMM-Newton Observations of Ultraluminous X-Ray Sources in Nearby Galaxies
• A variable Quasi-Periodic Ocillation in M82 X-1. Timing and spectral analysis of XMM-Newton and RossiXTE observations
• Modeling the hard states of XTE J1550--564 during its 2000 outburst
• Testing the Paradigm that Ultraluminous X-ray Sources as a Class Represent Accreting Intermediate-Mass Black Holes
• Origin of the X-ray Quasi-Periodic Oscillations and Identification of a Transient Ultraluminous X-Ray Source in M82
• Is M82 X-1 Really An Intermediate-Mass Black Hole? X-ray Spectral and Timing Evidence
• Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40
• Luminosity dependence of the electron temperature in the bright hard state of the black hole candidate GX 339--4
• Weighing the black holes in ultraluminous X-ray sources through timing
• Confirmation of the 62 Day X-Ray Periodicity from M82
• On the compact nature of the most luminous ULX in the Cartwheel ring
• The Orbital Period of the Ultraluminous X-ray Source in M82
• A Stellar-mass Black Hole in the Ultra-luminous X-ray Source M82 X-1?
• New flaring of an ultraluminous X-ray source in NGC 1365
• A Comparison of Ultraluminous X-ray Sources in NGC 1399 and the Antennae Galaxies (NGC 4038/4039)
• RXTE View of the Starburst Galaxies M82 and NGC 253

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• NuSTAR and XMM-Newton observations of the extreme ultraluminous X-ray source NGC 5907 ULX1: A Vanishing Act
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• Formation of Massive Black Holes in Dense Star Clusters. II. IMF and Primordial Mass Segregation
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• Resolving the X-ray emission from the Lyman continuum emitting galaxy Tol 1247-232
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