On the compact nature of the most luminous ULX in the Cartwheel ring

Abstract

We report the first detection of flux variability in the most luminous X-ray source in the southern ring of the Cartwheel galaxy. XMM--Newton data show that the luminosity has varied over a timescale of six months from L[0.5-10] keV \~1.3 10^{41} erg/s, consistent with the previous Chandra observation, to L[0.5-10] keV < 6.4 x10^{40} erg/s. This fact provides the first evidence that the source is compact in nature and is not a collection of individual fainter sources, such as supernova remnants. The source has been repeatedly observed at the very high luminosity level of L[0.5-10] keV ~1.3 x 10^{41} erg/s, for a period of at least 4 years before dimming at the current level. It represents then the first example of an accreting object revealed in a long lived state of extremely high luminosity.

arXiv comment6 pages; 3 figure; accepted for publication in MNRAS

References in corpus (34)

• Sources of Relativistic Jets in the Galaxy
• Ultraluminous X-Ray Sources in External Galaxies
• The runaway growth of intermediate-mass black holes in dense star clusters
• High Mass X-ray Binaries as a Star Formation Rate Indicator in Distant Galaxies
• The Nature of Accreting Black Holes in Nearby Galaxy Nuclei
• The Nature of Ultra-Luminous Compact X-Ray Sources in Nearby Spiral Galaxies
• Super-Eddington Fluxes from Thin Accretion Disks?
• Intermediate-Mass Black Holes
• Formation of Massive Black Holes in Dense Star Clusters. I. Mass Segregation and Core Collapse
• X-ray source populations in galaxies
• Chandra High-Resolution Camera Observations of the Luminous X-Ray Source in the Starburst Galaxy M82
• Discovery of X-ray QPOs from an Ultra-luminous X-ray Source in M82: Evidence Against Beaming
• Discovery of a Luminous, Variable, Off-Center Source in the Nucleus of M82 with the Chandra HRC
• Population X: Are the super-Eddington X-ray sources beamed jets in microblazars or intermediate mass black holes?
• 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
• Displacement of X-Ray Sources from Star Clusters in Starburst Galaxies
• Blunting the Spike: the CV Minimum Period
• Hard X-ray Variability in M82: Evidence for a Nascent AGN?
• Ultraluminous X-ray Sources and Star Formation
• The Time-Variable Ultra-Luminous X-ray Sources of "The Antennae"
• Hierarchical Merging, Ultraluminous and Hyperluminous X-ray Sources
• The Brightest Black Holes
• Chandra X-Ray Imaging of the Interacting Starburst Galaxy System NGC 7714/5: Tidal ULXs, Emergent Wind, and Resolved HII Regions
• A thorough study of the intriguing X-ray emission from the Cartwheel ring
• Tidal Capture of Stars by Intermediate-Mass Black Holes
• Models of Ultraluminous X-Ray Sources with Intermediate-Mass Black Holes
• Close Binary Interactions of Intermediate-Mass Black Holes: Possible Ultra-Luminous X-ray Sources?
• XMM Observations of an IXO in NGC 2276
• Radio pulsars around intermediate mass black holes in super stellar clusters
• The detection of non-thermal radio continuum spokes and the study of star formation in the Cartwheel
• A variable ultra-luminous X-ray source in the colliding galaxy NGC 7714
• Young Crab-like pulsars and luminous X-ray sources in starbursts and optically dull galaxies
• Have we detected the most luminous ULX so far?

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• Spatially Offset Active Galactic Nuclei III: Discovery of Late-Stage Galaxy Mergers with The Hubble Space Telescope
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• XMMSL1J063045.9-603110: a tidal disruption event fallen into the back burner
• Key results from an XMM-Newton and Chandra study of a new sample of extreme ULXs from the 2XMM catalogue
• The largest bright ULX population in a galaxy: X-ray variability and Luminosity Function in the Cartwheel ring Galaxy
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