Spatial distribution of Galactic Wolf-Rayet stars and implications for the global population

Abstract

We construct revised near-infrared absolute magnitude calibrations for 126 Galactic Wolf-Rayet (WR) stars at known distances, based in part upon recent large scale spectroscopic surveys. Application to 246 WR stars located in the field, permits us to map their galactic distribution. As anticipated, WR stars generally lie in the thin disk (~40pc half width at half maximum) between galactocentric radii 3.5-10kpc, in accordance with other star formation tracers. We highlight 12 WR stars located at vertical distances of >300pc from the midplane. Analysis of the radial variation in WR subtypes exposes a ubiquitously higher N_{WC}/N_{WN} ratio than predicted by stellar evolutionary models accounting for rotation. Models for non-rotating stars or accounting for close binary evolution are more consistent with observations. We consolidate information acquired about the known WR content of the Milky Way to build a simple model of the complete population. We derive observable quantities over a range of wavelengths, allowing us to estimate a total number of 1200(+300,-100) Galactic WR stars, implying an average duration of ~0.25Myr for the WR phase at the current Milky Way star formation rate. Of relevance to future spectroscopic surveys, we use this model WR population to predict follow-up spectroscopy to K_S ~ 13 mag will be necessary to identify 95% of Galactic WR stars. We anticipate that ESA's Gaia mission will make few additional WR star discoveries via low-resolution spectroscopy, though will significantly refine existing distance determinations. Appendix A provides a complete inventory of 322 Galactic WR stars discovered since the VIIth catalogue (313 including Annex), including a revised nomenclature scheme.

arXiv comment43 pages, 13 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society. Amended as outlined in a published Erratum (2015MNRAS.449.2436R). Galactic WR star catalogue: http://pacrowther.staff.shef.ac.uk/WRcat/

References in corpus (122)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Validation of the new Hipparcos reduction
• Embedded Clusters in Molecular Clouds
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• A new calibration of stellar parameters of Galactic O stars
• Physical Properties of Wolf-Rayet Stars
• The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data
• The evolution of rotating stars
• Mass loss from hot massive stars
• Database of Geneva stellar evolution tracks and isochrones for UBVRIJHKLL'M, HST-WFPC2, Geneva and Washington photometric systems
• Galactic-Field IMFs of Massive Stars
• Stellar evolution with rotation XI: Wolf-Rayet star populations at different metallicities
• The effect of massive binaries on stellar populations and supernova progenitors
• Self-Regulated Star Formation in Galaxies via Momentum Input from Massive Stars
• Gaia broad band photometry
• New Models for Wolf-Rayet and O Star Populations in Young Starbursts
• Variations in the Galactic star formation rate and density thresholds for star formation
• Massive Stars in the Quintuplet Cluster
• Interstellar Extinction Law toward the Galactic Center III: J, H, Ks bands in the 2MASS and the MKO systems, and 3.6, 4.5, 5.8, 8.0 micron in the Spitzer/IRAC system
• The Aao/Ukst Supercosmos H-alpha Survey (SHS)
• Toward a Unification of Star Formation Rate Determinations in the Milky Way and Other Galaxies
• The Spatial Distribution of Star Formation in the Solar Neighbourhood: Do all stars form in clusters?
• Parallaxes and proper motions of interstellar masers toward the Cygnus X star-forming complex. I. Membership of the Cygnus X region
• The Galactic WN stars: Spectral analyses with line-blanketed model atmospheres versus stellar evolution models with and without rotation
• UBVJHK synthetic photometry of Galactic O stars
• The death of massive stars - II. Observational constraints on the progenitors of type Ibc supernovae
• On the massive stellar population of the Super Star Cluster Westerlund 1
• Grids of stellar models with rotation II. WR populations and supernovae/GRB progenitors at Z = 0.014
• Line derived infrared extinction towards the Galactic Center
• The Structure of the Homunculus: I. Shape and Latitude Dependence from H2 and [Fe II] Velocity Maps of Eta Carinae
• Evolution and fate of very massive stars
• Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: II. The Molecular Gas Disk
• Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: I. The HI Disk
• A Trigonometric Parallax of Sgr B2
• A census of the Wolf-Rayet content in Westerlund 1 from near-infrared imaging and spectroscopy
• The most massive stars in the Arches cluster
• The Galactic WC stars: Stellar parameters from spectral analyses indicate a new evolutionary sequence
• The Trigonometric Parallax of Cygnus X-1
• HII Region Metallicity Distribution in the Milky Way Disk
• The Origin of OB Runaway Stars
• Luminous Blue Variables are Antisocial: Their Isolation Implies that they are Kicked Mass Gainers in Binary Evolution
• The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turn-offs. II. Results from 12 Galactic Clusters and OB Associations
• The Initial Mass Function of the Massive Star-forming Region NGC 3603 from Near-Infrared Adaptive Optics observations
• Stellar and Wind Properties of LMC WC4 stars - A metallicity dependence for Wolf-Rayet mass-loss rates
• The evolution of massive stars and their spectra I. A non-rotating 60 Msun star from the zero-age main sequence to the pre-supernova stage
• Implications of the metallicity dependence of Wolf-Rayet winds
• The massive star initial mass function of the Arches cluster
• A downward revision to the distance of the 1806-20 cluster and associated magnetar from Gemini near-Infrared spectroscopy
• Quantitative Spectroscopy of BA-type Supergiants
• Spectral Classification of O2-3.5If*/WN5-7 stars
• A Hidden Population of Massive Stars with Circumstellar Shells Discovered with the Spitzer Space Telescope
• Spatial distribution of Galactic HII regions
• Evolution of X-ray emission from young massive star clusters
• The Milky Way Project: A statistical study of massive star formation associated with infrared bubbles
• The prototype colliding-wind pinwheel WR 104
• The Slope of the Near Infrared Extinction Law
• Kinematics of OB-associations and the new reduction of the Hipparcos data
• The very massive binary NGC3603-A1
• Star formation and disk properties in Pismis 24
• Near-infrared counterparts to Chandra X-ray sources toward the Galactic Center. II. Discovery of Wolf-Rayet stars and O supergiants
• The Massive Star Content of NGC 3603
• Early-type stars in the core of the young open cluster Westerlund2
• Isolated Wolf-Rayet Stars and O Supergiants in the Galactic Center Region Identified via Paschen-alpha Excess
• A Search for Wolf-Rayet Stars in the Small Magellanic Cloud
• A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds: First Results
• Distance and the Initial Mass Function of Young Open Clusters In The Eta Carina Nebula: Tr 14 and Tr 16
• The distance and neutral environment of the massive stellar cluster Westerlund 1
• Cloud and Star Formation in Disk Galaxy Models with Feedback
• The G305 star-forming complex: the central star clusters Danks 1 and Danks 2
• A FUSE Survey of the Rotation Rates of Very Massive Stars in the Small and Large Magellanic Clouds
• Red Eyes on Wolf-Rayet Stars: 60 New Discoveries via Infrared Color Selection
• A newly-discovered young massive star cluster at the end of the Galactic Bar
• Pismis 24-1: The Stellar Upper Mass Limit Preserved
• The Quintuplet Cluster I. A K-band spectral catalog of stellar sources
• A Near-Infrared Survey of the Inner Galactic Plane for Wolf-Rayet Stars I. Methods and First Results: 41 New WR Stars
• IPHAS and the symbiotic stars. II. New discoveries and a sample of the most common mimics
• Searching for hidden Wolf-Rayet stars in the Galactic Plane - 15 new Wolf-Rayet stars
• First visual orbit for the prototypical colliding-wind binary WR 140
• Infrared Observations of the Candidate LBV 1806-20 & Nearby Cluster Stars
• Near-infrared spectra of Galactic stellar clusters detected on Spitzer/GLIMPSE images
• A search for Ejecta Nebulae around Wolf-Rayet Stars using the SHS H$\alpha$ survey
• An Ultraviolet to Mid-Infrared Study of the Physical and Wind Properties of HD 164270 (WC9) and Comparison to BD+30 3639 ([WC9])
• The first orbital solution for the massive colliding-wind binary HD93162 (=WR25)
• The Discovery of a Twelfth Wolf-Rayet Star in the Small Magellanic Cloud
• Wolf-Rayet and O Star Runaway Populations from Supernovae
• The formation of stars in groups
• Results from a Near Infrared Search for Emission-line Stars in the Inner Galaxy: Spectra of New Wolf-Rayet Stars
• Newly Discovered Wolf-Rayet and Weak Emission-Line Central Stars of Planetary Nebulae
• Massive open star clusters using the VVV survey II. Discovery of six clusters with Wolf-Rayet stars
• Discovery of a new Wolf-Rayet star and its ring nebula in Cygnus
• Massive stars in the Cl 1813-178 Cluster. An episode of massive star formation in the W33 complex
• The X-ray source content of the XMM-Newton Galactic Plane Survey
• A Near-Infrared Survey of the Inner Galactic Plane for Wolf-Rayet Stars II. Going Fainter: 71 More New WR Stars
• A Multiwavelength Study of Evolved Massive Stars in the Galactic Center
• A spectroscopic investigation of early-type stars in the young open cluster Westerlund 2
• Obscured clusters.I. GLIMPSE30 - Young Milky Way Star Cluster Hosting Wolf-Rayet Stars
• An XMM-Newton view of the young open cluster NGC 6231 -- I. The catalogue
• Abell 48 - a rare WN-type central star of a planetary nebula
• Fundamental Parameters of four Massive Eclipsing Binaries in Westerlund 1
• The Fundamental Parameters of Four Massive Eclipsing Binaries in Westerlund 1
• Spatially resolved STIS spectra of WR+OB binaries with colliding winds
• 12 New Galactic Wolf-Rayet Stars Identified via 2MASS+Spitzer/GLIMPSE
• IC 4663: The first unambiguous [WN] Wolf-Rayet central star of a planetary nebula
• Identification of the Infrared Counterpart to a Newly Discovered X-ray Source in the Galactic Center
• New Wolf-Rayet star and its circumstellar nebula in Aquila
• Identification of a Population of X-ray Emitting Massive Stars in the Galactic Plane
• The Discovery of a Rare WO-type Wolf-Rayet Star in the Large Magellanic Cloud
• Obscured clusters.IV. The most massive stars in [DBS2003]179
• Characterizing Wolf-Rayet Stars in the Near and Mid Infrared
• Suzaku X-Ray Spectroscopy of a Peculiar Hot Star in the Galactic Center Region
• Dust formation by the colliding-wind WC5+O9 binary WR19 at periastron passage
• Discovery of Twin Wolf-Rayet Stars Powering Double Ring Nebulae
• A Galactic O2 If*/WN6 star possibly ejected from its birthplace in NGC3603
• Population I Wolf-Rayet Runaway Stars: the Case of WR124 and its Expanding Nebula M1-67
• Spectroscopic Confirmation of the Dragonfish Association: The Galaxy's Most Luminosity OB Association
• A New Wolf-Rayet Star and its Ring Nebula: PCG11
• An O2If*/WN6 Star Catch in the Act in a Compact Hii region in the Starburst Cluster NGC 3603
• WR 120bb and WR 120bc: a pair of WN9h stars with possibly interacting circumstellar shells
• The radio and IR counterparts of the ring nebula around HD211564
• WR 143: A Wolf-Rayet Binary
• Discovery of two Galactic Wolf-Rayet stars in Circinus
• Discovery of a Wolf-Rayet Star Through Detection of its Photometric Variability

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• Gaia Data Release 3: Apsis II -- Stellar Parameters
• Multi-messenger signals of long-term core-collapse supernova simulations : synergetic observation strategies
• The Galactic WC and WO stars: The impact of revised distances from Gaia DR2 and their role as massive black hole progenitors
• Cosmic-ray energy spectrum and composition up to the ankle - the case for a second Galactic component
• The Type Icn SN 2021csp: Implications for the Origins of the Fastest Supernovae and the Fates of Wolf-Rayet Stars
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• Unlocking Galactic Wolf-Rayet stars with $\text{Gaia}$ DR2 I: Distances and absolute magnitudes
• Constraining the sources of ultra-high-energy cosmic rays across and above the ankle with the spectrum and composition data measured at the Pierre Auger Observatory
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• Gemini/GNIRS infrared spectroscopy of the Wolf-Rayet stellar wind in Cygnus X-3
• The Villafranca catalog of Galactic OB groups. II. From Gaia DR2 to EDR3 and ten new systems with O stars
• Revisiting the Impact of Dust Production from Carbon-Rich Wolf-Rayet Binaries
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• Analysis of physical processes in eruptive YSOs with near infrared spectra and multi-wavelength light curves
• Unlocking Galactic Wolf-Rayet stars with $\text{Gaia}$ DR2 II: Cluster and Association membership
• X-ray emission from BH+O star binaries expected to descend from the observed galactic WR+O binaries
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• A spectroscopic multiplicity survey of Galactic Wolf-Rayet stars: II. The northern WNE sequence
• Variable dust emission by WC type Wolf-Rayet stars observed in the NEOWISE-R survey
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• The variability of the BRITE-est Wolf-Rayet binary, ${\gamma }^2$ Velorum I. Photometric and spectroscopic evidence for colliding winds
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• The CHARA Array resolves the long-period Wolf-Rayet binaries WR 137 and WR 138
• The First Dynamical Mass Determination of a Nitrogen-rich Wolf-Rayet Star using a Combined Visual and Spectroscopic Orbit
• Stellar Population Diagnostics of the Massive Star Binary Fraction
• Revealing Efficient Dust-Formation at Low Metallicity in Extragalactic Carbon-Rich Wolf-Rayet Binaries
• SOAR optical and near-infrared spectroscopic survey of newly discovered massive stars in the periphery of Galactic Massive star clusters I - NGC3603
• A spectroscopic multiplicity survey of Galactic Wolf-Rayet stars. III. The northern late-type nitrogen-rich sample
• Red Supergiant Candidates for Multimessenger Monitoring of the Next Galactic Supernova
• Impact of main-sequence mass loss on the appearance, structure and evolution of Wolf-Rayet stars
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• On the apparent absence of WR+NS systems: the curious case of WR124
• Binary Fraction Indicators in Resolved Stellar Populations and Supernova Type Ratios
• Investigating 39 Galactic Wolf-Rayet stars with VLTI/GRAVITY: Uncovering A Long Period Binary Desert
• Evolutionary Map of the Universe (EMU):Compact radio sources in the SCORPIO field towards the Galactic plane
• Mass and wind luminosity of young Galactic open clusters in Gaia DR2
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• Estimation of the Radial Scale Length and Vertical Scale Height of the Galactic Thin Disk from Cepheids
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