Interstellar Weather Vanes: GLIMPSE Mid-Infrared Stellar-Wind Bowshocks in M17 and RCW49
arXiv:0808.2168 · doi:10.1086/592565
Abstract
We report the discovery of six infrared stellar-wind bowshocks in the Galactic massive star formation regions M17 and RCW49 from Spitzer GLIMPSE (Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) images. The InfraRed Array Camera (IRAC) on the Spitzer Space Telescope clearly resolves the arc-shaped emission produced by the bowshocks. We combine Two Micron All-Sky Survey (2MASS), Spitzer, MSX, and IRAS observations to obtain the spectral energy distributions (SEDs) of the bowshocks and their individual driving stars. We use the stellar SEDs to estimate the spectral types of the three newly-identified O stars in RCW49 and one previously undiscovered O star in M17. One of the bowshocks in RCW49 reveals the presence of a large-scale flow of gas escaping the H II region at a few 10^2 km/s. Radiation-transfer modeling of the steep rise in the SED of this bowshock toward longer mid-infrared wavelengths indicates that the emission is coming principally from dust heated by the star driving the shock. The other 5 bowshocks occur where the stellar winds of O stars sweep up dust in the expanding H II regions.
17 pages, 3 figure, accepted for publication in ApJ
References in corpus (23)
- The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
- Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
- Mass-loss predictions for O and B stars as a function of metallicity
- GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
- Interpreting Spectral Energy Distributions from Young Stellar Objects. II. Fitting observed SEDs using a large grid of pre-computed models
- The Evolution and Structure of Pulsar Wind Nebulae
- 2-D Radiative Transfer in Protostellar Envelopes: I. Effects of Geometry on Class I Sources
- The Discordance of Mass-Loss Estimates for Galactic O-Type Stars
- Ten Million Degree Gas in M 17 and the Rosette Nebula: X-ray Flows in Galactic H II Regions
- IR Dust Bubbles: Probing the Detailed Structure and Young Massive Stellar Populations of Galactic HII Regions
- A Magnetically-Supported Photodissociation Region in M17
- Hydrodynamics of Cometary Compact HII Regions
- Early-type stars in the core of the young open cluster Westerlund2
- Discovery of a bow shock around Vela X-1
- A very massive runaway star from Cygnus OB2
- On the absence of wind bow-shocks around OB-runaway stars: probing the physical conditions of the interstellar medium
- Emission from Very Small Grains and PAH Molecules in Monte Carlo Radiation Transfer Codes: Application to the Edge-On Disk of Gomez's Hamburger
- Modeling the Infrared Bow Shock at delta Velorum: Implications for Studies of Debris Disks and lambda Bootis Stars
- On the Distance and Molecular Environment of Westerlund 2 and HESS J1023-575
- To see or not to see a Bow Shock: Identifying Bow Shocks with H-Alpha Allsky Surveys
- The K-band Spectrum of The Hot Star in IRS~8: An Outsider in the Galactic Center?
- A Cometary Bow Shock and Mid-Infrared Emission Variations Revealed in Spitzer Observations of HD 34078 and IC 405
- Identification of Main Sequence Stars with Mid-Infrared Excesses Using GLIMPSE: Beta-Pictoris Analogs?
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- Toward a Unification of Star Formation Rate Determinations in the Milky Way and Other Galaxies
- Feedback from Winds and Supernovae in Massive Stellar Clusters. I: Hydrodynamics
- Triggered star formation on the borders of the Galactic HII region RCW 120
- The Extended Environment of M17: A Star Formation History
- The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies. III. The Reddest Extended Sources in WISE
- E-BOSS: an Extensive stellar BOw Shock Survey. I: Methods and First Catalogue
- One Dimensional Dynamical Models of the Carina Nebula Bubble
- MN48: a new Galactic bona fide luminous blue variable revealed by Spitzer and SALT
- A comprehensive search for stellar bowshock nebulae in the Milky Way: a catalog of 709 mid-infrared selected candidates
- E-BOSS: An Extensive stellar BOw Shock Survey. II. Catalogue second release
- Search for OB stars running away from young star clusters. II. The NGC 6357 star-forming region
- Cometary shaped sources at the Galactic Center - Evidence for a wind from the central 0.2 pc
- OB Stars & Stellar Bowshocks in Cygnus-X: A Novel Laboratory Estimating Stellar Mass Loss Rates
- Spitzer Space Telescope observations of the Carina Nebula: The steady march of feedback-driven star formation
- Double bow shocks around young, runaway red supergiants: application to Betelgeuse
- IRC-10414: a bow-shock-producing red supergiant star
- Bow shock nebulae of hot massive stars in a magnetized medium
- IR Dust Bubbles II: Probing the Detailed Structure and Young Massive Stellar Populations of Galactic HII Regions
- The Milky Way Project Second Data Release: Bubbles and Bow Shocks
- Candidate X-ray-Emitting OB Stars in the Carina Nebula Identified Via Infrared Spectral Energy Distributions
- Detecting stellar-wind bubbles through infrared arcs in HII regions
- Reddening, Distance, and Stellar Content of the Young Open Cluster Westerlund 2
- Infrared Photometric Properties of 709 Candidate Stellar Bowshock Nebulae
- Massive pre-main sequence stars in M17
- 3D MHD astrospheres: applications to IRC-10414 and Betelgeuse
- Bow shocks, bow waves, and dust waves. I. Strong coupling limit
- Shock structures of astrospheres
- Massive Stars in the W33 Giant Molecular Complex
- Runaway massive stars as variable gamma-ray sources
- IR nebulae around bright massive stars as indicators for binary interactions
- Demonstration of a novel method for measuring mass-loss rates for massive stars
- Modelling multi-wavelength observational characteristics of bow shocks from runaway early type stars
- Bow shocks, bow waves, and dust waves. II. Beyond the rip point
- FOREST Unbiased Galactic Plane Imaging Survey with the Nobeyama 45-m Telescope (FUGIN) IV: Galactic Shock Wave and Molecular Bow Shock in the 4-kpc Arm of the Galaxy
- Bow shocks, bow waves, and dust waves. III. Diagnostics
- IRAS03063+5735: A Bowshock Nebula Powered by an Early B Star
- Candidate X-ray-Emitting OB Stars in the MYStIX Massive Star-Forming Regions
- Probing the massive star forming environment - a multiwavelength investigation of the filamentary IRDC G333.73+0.37
- High resolution radio emission from RCW 49/Westerlund 2
- Extended Red Objects and Stellar Wind Bow Shocks in the Carina Nebula
- Cold gas in hot star clusters: the wind from the red supergiant W26 in Westerlund 1
- Spitzer observations of Bow Shocks and Outflows in RCW 38
- Radio detections of IR-selected runaway stellar bow shocks
- Spatial distributions and kinematics of shocked and ionized gas in M17
- Modelling O-star astrospheres with different relative speeds between the ISM and the star: 2D and 3D MHD model comparison
- Proper motions of five OB stars with candidate dusty bow shocks in the Carina Nebula
- Detections of massive stars in the cluster MCM2005b77, in the star-forming regions GRS G331.3400.36 (S62) and GRS G337.9200.48 (S36)
- Mass loading of outflows from evolving Young Massive Clusters
- Concerning the occurrence of bow shocks around high-mass X-ray binaries
- Kinematics of the Central Stars Powering Bowshock Nebulae and the Large Multiplicity Fraction of Runaway OB Stars