The Transient Ultra-luminous X-ray Source, ULX-4, in M51
arXiv:2106.14322 · doi:10.1093/mnras/stab3693
Abstract
We present the results of a temporal and spectral analysis of the transient source ULX-4 in the galaxy M51. The data used were drawn from Chandra, XMM-Newton and Swift-XRT archives, spanning the years 2000-2019. The X-ray flux of the source is seen to vary by two orders of magnitudes within a month but a short-term variability was not observed over the time intervals of 100-2000 second in the 0.3-10 keV energy band. We find some evidence for the existence of bi-modality feature in the flux distribution of ULX-4. We identified two optical sources as possible counterparts within an error radius of 0."18 at 95% confidence level for ULX-4 based on the archival HST/ACS and HST/WFC3 data. Blackbody fits of the spectral energy distributions (SEDs) indicate the spectral type to be B-type stars. One of these counterparts exhibits a low-amplitude optical periodicity of 264 days in the F606W filter; if we assume this apparent periodicity is associated with the orbital motion of the donor, then it is more likely that the donor is a red supergiant satisfying the long periodicity and accretion via Roche-lobe overflow. Consequently, the SED would then have to be interpreted as a superposition of emissions from a cold donor and a hot flow component, most likely from an accretion disk. If, on the other hand, the periodicity is super orbital in nature i.e., due to possible interactions of the compact object with a circumstellar disk, the donor could then be a Be/X star hosting a neutron star.
arXiv commentAccepted for publication in MNRAS. 16 pages, 12 figures, 6 tables
References in corpus (65)
- Stellar population synthesis at the resolution of 2003
- PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
- X-ray Properties of Black-Hole Binaries
- Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
- The Photometric Performance and Calibration of the HST Advanced Camera For Surveys
- An Ultraluminous X-ray Source Powered by An Accreting Neutron Star
- The Nature of Accreting Black Holes in Nearby Galaxy Nuclei
- Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
- Ultraluminous X-Ray Sources
- Sonic-Point Model of Kilohertz Quasi-Periodic Brightness Oscillations in Low-Mass X-ray Binaries
- X-ray reverberation around accreting black holes
- An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907
- The Ultraluminous State
- kHz Quasi Periodic Oscillations in Low Mass X-ray Binaries as Probes of General Relativity in the Strong Field Regime
- Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13
- States and transitions in black-hole binaries
- Discovery of pulsations from NGC 300 ULX1 and its fast period evolution
- Stingray: A Modern Python Library For Spectral Timing
- The ultraluminous state revisited: fractional variability and spectral shape as diagnostics of super-Eddington accretion
- A mass of less than 15 solar masses for the black hole in an ultraluminous X-ray source
- A ROSAT HRI survey of bright nearby galaxies
- A Catalog of Candidate Intermediate-luminosity X-ray Objects
- A Complete Sample of ULX Host Galaxies
- The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2
- Propeller effect in action in the ultraluminous accreting magnetar M82 X-2
- Observing the effects of the event horizon in black holes
- The X-ray Luminosity Function of "The Antennae" Galaxies (NGC4038/39) and the Nature of Ultra-Luminous X-ray Sources
- From ultraluminous X-ray sources to ultraluminous supersoft sources: NGC 55 ULX, the missing link
- The star-forming environment of a ULX in NGC 4559: an optical study
- Kilohertz QPOs in Neutron Star Binaries modeled as Keplerian Oscillations in a Rotating Frame of Reference
- XMM-Newton Observations of Ultraluminous X-Ray Sources in Nearby Galaxies
- Optical counterparts of the nearest ultraluminous X-ray sources
- On the Apparent Lack of Be X-ray Binaries with Black Holes
- An Early & Comprehensive Millimeter and Centimeter Wave and X-ray Study of Supernova 2011dh: A Non-Equipartition Blastwave Expanding into A Massive Stellar Wind
- Spectral Changes in the Hyperluminous Pulsar in NGC 5907 as a Function of Super-Orbital Phase
- The missing link: a low mass X-ray binary in M31 seen as an ultraluminous X-ray source
- Pulsing and Non-Pulsing ULXs: the Iceberg Emerges
- The linear rms-flux relation in an Ultraluminous X-ray Source
- M51 ULX-7: super-orbital periodicity and constraints on the neutron star magnetic field
- Searching for propeller-phase ULXs in the XMM-Newton Serendipitous Source Catalogue
- Time lags in the ultraluminous X-ray source NGC 5408 X-1: implications for the black hole mass
- Hubble Space Telescope Identification of the Optical Counterparts of Ultraluminous X-ray Sources in M51
- XMM-Newton view of the ultra-luminous X-ray sources in M51
- X-ray and optical variability of the ultraluminous X-ray source NGC 1313 X-2
- Swift monitoring of M51: A 38-day super-orbital period for the pulsar ULX7 and a new transient ULX
- Time lags of the kilohertz quasi-periodic oscillations in the low-mass X-ray binaries 4U 1608--52 and 4U 1636--53
- The Hunt for Pulsating Ultraluminous X-ray Sources
- Multiband counterparts of two eclipsing ultraluminous X-ray sources in M 51
- X-ray time lags and nonlinear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1
- Orbital and super-orbital periods in ULX pulsars, disc-fed HMXBs, Be/X-ray binaries and double-periodic variables
- Understanding the spectral and timing behavior of a newly discovered transient X-ray pulsar Swift J0243.6+6124
- AstroSat Observations of the first Galactic ULX Pulsar Swift J0243.6+6124
- NIR Counterparts to ULXs (III): Completing the photometric survey and selected spectroscopic results
- Discovery of a soft X-ray lag in the Ultraluminous X-ray Source NGC 1313 X-1
- ESO 243-49 HLX-1: scaling of X-ray spectral properties and black hole mass determination
- Discovery of a transient ultraluminous X-ray source in the elliptical galaxy M86
- Super-Eddington accretion onto a stellar mass ultraluminous X-ray source NGC 4190 ULX1
- The rare X-ray flaring activity of the Ultraluminous X-ray source NGC 4559 X7
- A New Transient Ultraluminous X-ray Source in NGC 7090
- Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2
- Simulating the X-ray luminosity of Be X-ray binaries: the case for black holes versus neutron stars
- Optical Counterparts of an Ultraluminous X-Ray Source X-1 in NGC 2500
- The ULX Source X-3 in NGC 4258: A Search for Its X-ray and Optical Properties
- Identification of a New Ultraluminous X-ray Source in NGC 1316
- Optical Counterparts of ULXs in Two Dwarf Galaxies: NGC 4861 and NGC 4449
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- Detection of 125.5-day Optical Periodic Modulation of the Neutron Star M51 ULX-8
- Optical Counterparts of ULXs in NGC 1672
- New Transient ULX Candidate in NGC 4254: Evidence of Circumbinary Disk?
- Comprehensive X-ray and Multiwavelength Study of ULXs in NGC 1566
- The First Glimpse of ULXs Through the Near-Infrared Images Captured by the James Webb Space Telescope
- Possible optical counterparts of ULXs in NGC 1672