The First Candidate Colliding-Wind Binary in M33

Abstract

We present the detection of the first candidate colliding-wind binary (CWB) in M33, located in the giant H II region NGC 604. The source was first identified in archival {\it Chandra} imaging as a relatively soft X-ray point source, with the likely primary star determined from precise astrometric alignment between archival {\it Hubble Space Telescope} and {\it Chandra} imaging. The candidate primary star in the CWB is classified for the first time in this work as a carbon-rich Wolf-Rayet star with a likely O star companion based on spectroscopy obtained from Gemini-North. We model the X-ray spectrum using {\it Chandra} and {\it XMM-Newton} observations, and find the CWB is well-fit as a $\sim$ 1 keV thermal plasma with a median unabsorbed luminosity in the 0.5--2.0 keV band of $L_{\mathrm{X}}$ $\sim$ 3 $\times$ 10${}^{35}$ erg s${}^{-1}$, making this source among the brightest of CWBs observed to date. We present a long term light curve for the candidate CWB from archival {\it Chandra} and {\it XMM-Newton} observations, and discuss the constraints placed on the binary by this light curve, as well as the X-ray luminosity at maximum. Finally, we compare this candidate CWB in M33 to other well-studied, bright CWBs in the Galaxy and Magellanic Clouds, such as $\eta$ Car.

21 pages, 8 figures, 4 tables, Accepted for publication in ApJ

References in corpus (81)

• Astropy: A Community Python Package for Astronomy
• The chemical composition of the Sun
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• Binary interaction dominates the evolution of massive stars
• Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
• Mass-loss predictions for O and B stars as a function of metallicity
• Modelling the behaviour of accretion flows in X-ray binaries
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• Mass Loss: Its Effect on the Evolution and Fate of High-Mass Stars
• WFPC2 Stellar Photometry with HSTphot
• The ACS Nearby Galaxy Survey Treasury
• Sherpa: a Mission-Independent Data Analysis Application
• A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
• The Discordance of Mass-Loss Estimates for Galactic O-Type Stars
• The Panchromatic Hubble Andromeda Treasury
• Bayesian Estimation of Hardness Ratios: Modeling and Computations
• X-Ray Spectroscopy of Stars
• The Panchromatic Hubble Andromeda Treasury X. Ultraviolet to Infrared Photometry of 117 Million Equidistant Stars
• In Hot Pursuit of the Hidden Companion of Eta Carinae: An X-ray Determination of the Wind Parameters
• The Galactic WC stars: Stellar parameters from spectral analyses indicate a new evolutionary sequence
• Forming short-period Wolf-Rayet X-ray binaries and double black holes through stable mass transfer
• A multi-wavelength view on the dusty Wolf-Rayet star WR 48a
• Neglecting the porosity of hot-star winds can lead to underestimating mass-loss rates
• Puzzling accretion onto a black hole in the ultraluminous X-ray source M101 ULX-1
• Properties of Galactic early-type O-supergiants: A combined FUV-UV and optical analysis
• An XMM-Newton view of the young open cluster NGC 6231 -- II. The OB star population
• On IC 10 X-1, the Most Massive Known Stellar-Mass Black Hole
• WR 20a is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System
• The Orbital Period of the Wolf-Rayet Binary IC 10 X-1; Dynamic Evidence that the Compact Object is a Black Hole
• Radio, X-ray, and gamma-ray Emission Models of the Colliding Winds Binary WR 140
• Mass loss from inhomogeneous hot star winds II. Constraints from a combined optical/UV study
• The metallicity gradient of M 33: chemical abundances of HII regions
• Global X-ray properties of the O and B stars in Carina
• The Chandra ACIS Survey of M33: X-ray, Optical and Radio Properties of the Supernova Remnants
• Chandra/ACIS Subpixel Event Repositioning. II. Further Refinements and Comparison between Backside and Front-side Illuminated X-ray CCDs
• WR20a: a massive cornerstone binary system comprising two extreme early-type stars
• Neon and Oxygen Abundances in M33
• NGC 300 X-1 is a Wolf-Rayet/Black-Hole binary
• Measuring mass-loss rates and constraining shock physics using X-ray line profiles of O stars from the Chandra archive
• A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds: First Results
• The Wolf-Rayet Content of M33
• The massive stellar content in NGC604 and its evolutionary state
• The Conspicuous Absence of X-ray Emission from Carbon-Enriched Wolf-Rayet Stars
• X-ray emission from interacting massive binaries: a review of 15 years of progress
• A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds. IV. A Final Census
• X-ray emission lines from inhomogeneous stellar winds
• The Supernova Progenitor Mass Distributions of M31 and M33: Further Evidence for an Upper Mass Limit
• A Spectroscopic Survey of Massive Stars in M31 and M33
• NGC 604, the Scaled OB Association (SOBA) Prototype. I: Spatial Distribution of the Different Gas Phases and Attenuation by Dust
• A detailed X-ray investigation of zeta Puppis - The variability on short and long timescales
• A Clumping Independent Diagnostic of Stellar Mass-loss Rates: Rapid Clump Destruction in Adiabatic Colliding Winds
• A New Comprehensive 2-D Model of the Point Spread Functions of the XMM-Newton EPIC Telescopes : Spurious Source Suppression and Improved Positional Accuracy
• X-ray emission from massive stars in Cyg OB2
• An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. I. The Chandra ACIS Dataset
• Chandra X-ray spectroscopy of the very early O supergiant HD 93129A: constraints on wind shocks and the mass-loss rate
• The first orbital solution for the massive colliding-wind binary HD93162 (=WR25)
• The Chandra ACIS Survey of M33 (ChASeM33): The final source catalog
• Weighing Melnick 34: the most massive binary system known
• The Close Binary Frequency of Wolf-Rayet Stars as a Function of Metallicity in M31 and M33
• The dominant X-ray wind in massive star binaries
• Properties of Optically Selected Supernova Remnant Candidates in M33
• The red supergiants & Wolf-Rayet stars of NGC 604
• Recurrent dust formation by WR 48a on a 30-year timescale
• STIS Spectral Imagery of the OB Stars in NGC 604: The Most Luminous Stars
• V444 Cyg X-ray and polarimetric variability: Radiative and Coriolis forces shape the wind collision region
• X-ray, UV and optical analysis of supergiants: $\epsilon$ Ori
• Wolf-Rayet Stars in M33 II: Optical Spectroscopy of emission-line stars in Giant Hii Regions
• Supernova Remnants in M33: X-ray Properties as Observed by XMM-Newton
• Formation Timescales for High-Mass X-ray Binaries in M33
• The 155-day X-ray cycle of the very massive Wolf-Rayet star Melnick 34 in the Large Magellanic Cloud
• Suzaku monitoring of the Wolf-Rayet binary WR140 around periastron passage: An approach for quantifying the wind parameters
• MARXS: A modular software to ray-trace X-ray instrumention
• XMM-Newton Observations Reveal Very High X-ray Luminosity from the Carbon-rich Wolf-Rayet Star WR 48a
• Interstellar abundances in the neutral and ionized gas of NGC604
• The Chandra ACIS Survey of M33 (ChASeM33): Investigating the Hot Ionized Medium in NGC604
• A new candidate Wolf-Rayet X-ray binary in NGC 253
• A Deep XMM-Newton Survey of M33: Point Source Catalog, Source Detection and Characterization of Overlapping Fields
• On the Nature of the X-ray Emission from the Ultraluminous X-ray Source, M33 X-8: New Constraints from NuSTAR and XMM-Newton
• Unveiling the new generation of stars in NGC 604 with Gemini-NIRI

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• Accretion in massive colliding wind binaries and the effect of wind momentum ratio