Evolution of the spectral curvature in the ULX Holmberg II X-1
arXiv:1202.1102 · doi:10.1111/j.1365-2966.2012.20671.x
Abstract
Ultraluminous X-ray sources (ULXs) are interesting systems as they can host intermediate mass black holes. Alternatively, ULXs can represent stellar-mass black holes accreting at super-Eddington rates. Recently spectral curvature or breaks at energies above a few keV have been detected in high quality ULX spectra. These spectral features have been taken as evidence against the intermediate-mass black hole case. In this paper, we report on a new XMM-Newton observation of the ULX Holmberg II X-1 that also shows a clear spectral break at approximately 4 keV. This observation was performed during a low luminosity state of the system and by comparing this new data to a high luminosity state XMM-Newton observation, we can conclude that the spectral break energy increases with luminosity. This behaviour is different to a ULX in the Holmberg IX galaxy,where an opposite trend between the luminosity and the spectral break energy has been claimed. We discuss mechanisms that could explain this complex behaviour.
arXiv comment7 pages, 3 figures and 2 tables. Accepted for publication in MNRAS
References in corpus (52)
- On the Absorption of X-rays in the Interstellar Medium
- Supermassive Black Holes in Galactic Nuclei: Past, Present and Future Research
- The formation of massive black holes through collision runaway in dense young 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
- X-ray emission from star-forming galaxies - I. High-mass X-ray binaries
- Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
- An Intermediate-mass Black Hole of Over 500 Solar Masses in the Galaxy ESO 243-49
- The Nature of Ultra-Luminous Compact X-Ray Sources in Nearby Spiral Galaxies
- Radiation mechanisms and geometry of Cygnus X-1 in the soft state
- The Ultraluminous State
- Global Structure of Three Distinct Accretion Flows and Outflows around Black Holes through Two-Dimensional Radiation-Magnetohydrodynamic Simulations
- The Ultra-Luminous X-ray Source Population from the Chandra Archive of Galaxies
- Ultraluminous X-ray Sources in the Chandra and XMM-Newton Era
- Missing Link Found? --- The ``runaway'' path to supermassive black holes
- X-ray Spectroscopic Evidence for Intermediate Mass Black Holes: Cool Accretion Disks in Two Ultra--Luminous X-ray Sources
- XMM-Newton observations of the brightest Ultraluminous X-ray sources
- Chandra High-Resolution Camera Observations of the Luminous X-Ray Source in the Starburst Galaxy M82
- Slim Disk Model for Ultra-Luminous X-Ray Sources
- High Resolution Imaging of the HeII lambda 4686 Emission Line Nebula Associated with the Ultraluminous X-Ray Source in Holmberg II
- Radio Emission from an Ultraluminous X-Ray Source
- Spectral variability of ultraluminous X-ray sources
- X-ray Variability and Hardness of ESO 243-49 HLX-1: Clear Evidence for Spectral State Transitions
- XMM-Newton Archival Study of the ULX Population in Nearby Galaxies
- Super-Eddington accretion disc around a Kerr black hole
- A Systematic Study of Variability in a Sample of Ultraluminous X-ray Sources
- Displacement of X-Ray Sources from Star Clusters in Starburst Galaxies
- Spectral States and Evolution of Ultraluminous X-ray Sources
- Ultraluminous X-ray Source Correlations with Star-Forming Regions
- First evidence for spectral state transitions in the ESO243-49 hyper luminous X-ray source HLX-1
- On the weakness of disc models in bright ULXs
- Ultraluminous X-ray Sources and Star Formation
- A transition to a low/soft state in the ultra-luminous compact X-ray source Holmberg II X-1
- A Young Massive Stellar Population Around the Intermediate Mass Black Hole ESO 243-49 HLX-1
- A deep XMM-Newton observation of the ultraluminous X-ray source HoII X-1 : the case against a 1000 solar mass black hole
- Identification of the X-Ray Thermal Dominant State in an Ultraluminous X-Ray Source in M82
- Radio Emission Associated with the ULX in Holmberg II
- X-ray spectral evolution in M33 X-8
- Bridging the gap between stellar-mass black holes and ultraluminous X-ray sources
- X-Ray Monitoring of Ultraluminous X-Ray Sources
- Feedback from supercritical disk accretion flows; Two-dimensional radiation-hydrodynamic simulations of stable and unstable disks with radiatively driven outflows
- X-ray spectral variability in the ultraluminous X-ray source Holmberg IX X-1
- (No) dynamical constraints on the mass of the black hole in two ULXs
- Discovery of a 115 Day Orbital Period in the Ultraluminous X-ray Source NGC 5408 X-1
- Spectral Evolution of NGC 1313 X-2: Evidence Against The Cool Disk Model
- X-ray spectral state is not correlated with luminosity in Holmberg II X-1
- The Ultraluminous X-ray Sources near the Center of M82
- The First Detection of [O IV] from an Ultraluminous X-ray Source with Spitzer. II. Evidence for High Luminosity in Holmberg II ULX
- Multiple Components of the Luminous Compact X-ray Source at the Edge of Holmberg II observed by ASCA and ROSAT
- Detailed spectral study of an ultra-luminous compact X-ray source M81 X-9 in the disk dominated state
- Dynamics of massive stellar black holes in young star clusters and the displacement of ultra-luminous X-ray sources
- Swift observations of the ultraluminous X-ray source Holmberg IX X-1
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- Ultraluminous X-Ray Sources
- The ultraluminous state revisited: fractional variability and spectral shape as diagnostics of super-Eddington accretion
- ULX spectra revisited: Accreting, highly magnetized neutron stars as the engines of ultraluminous X-ray sources
- NuSTAR, XMM-Newton and Suzaku Observations of the Ultraluminous X-ray Source Holmberg II X-1
- Ultra Luminous X-ray Sources: a deeper insight into their spectral evolution
- The X-ray spectral evolution of the ultraluminous X-ray source Holmberg IX X-1
- A bright ultraluminous X-ray source in NGC 5907
- Irradiated, colour-temperature-corrected accretion discs in ultraluminous X-ray sources
- Ultra-luminous X-ray Sources as Supercritical Accretion Disks: Spectral Energy Distributions
- A deficit of ultraluminous X-ray sources in luminous infrared galaxies
- A State Transition of the Luminous X-ray Binary in the Low-Metallicity Blue Compact Dwarf Galaxy I Zw 18
- Patchy Accretion Disks in Ultraluminous X-ray Sources
- The ultraluminous X-ray source NGC 5643 ULX1: a large stellar mass black hole accreting at super-Eddington rates?
- NGC 7793 P9: An Ultraluminous X-Ray Source Evolved from a Canonical Black Hole X-Ray Binary
- A New Possible Accretion Scenario for Ultra-Luminous X-ray Sources
- Revealing the nature of the ULX and X-ray population of the spiral galaxy NGC 4088
- Modelling multiwavelength emission of Ultra-luminous X-ray Sources accreting above the Eddington limit
- An extreme Ultraluminous X-ray source X-1 in NGC 5055
- Multi-wavelength spectroscopic analysis of the ULX Holmberg II X-1 and its nebula suggests the presence of a heavy black hole accreting from a B-type donor
- Observational limits on the X-ray emission from the bubble nebula surrounding Ho IX X-1
- Simultaneous X-ray/UV observations of ultraluminous X-ray source Holmberg II X-1 with Indian space mission AstroSat