The MYStIX InfraRed-Excess Source Catalog

Abstract

The MYStIX project (Massive Young Star-Forming Complex Study in Infrared and X-rays) provides a comparative study of 20 Galactic massive star-forming complexes (d = 0.4 to 3.6 kpc). Probable stellar members in each target complex are identified using X-ray and/or infrared data via two pathways: (1) X-ray detections of young/massive stars with coronal activity/strong winds; or (2) infrared excess (IRE) selection of young stellar objects (YSOs) with circumstellar disks and/or protostellar envelopes. We present the methodology for the second pathway, using Spitzer/IRAC, 2MASS, and UKIRT imaging and photometry. Although IRE selection of YSOs is welltrodden territory, MYStIX presents unique challenges. We combine IR spectral energy distribution (SED) fitting with IR color cuts and spatial clustering analysis to identify IRE sources and isolate probable YSO members in each MYStIX target field from the myriad types of contaminating sources that can resemble YSOs: extragalactic sources, evolved stars, nebular knots, and even unassociated foreground/background YSOs. Applying our methodology consistently across 18 of the target complexes, we produce the MYStIX IRE Source (MIRES) Catalog comprising 20,719 sources, including 8686 probable stellar members of the MYStIX target complexes. We also classify the SEDs of 9365 IR counterparts to MYStIX X-ray sources to assist the first pathway, the identification of X-ray detected stellar members. The MIRES catalog provides a foundation for follow-up studies of diverse phenomena related to massive star cluster formation, including protostellar outflows, circumstellar disks, and sequential star formation triggered by massive star feedback processes.

67 pages, 11 figures. Accepted for publication in Astrophysical Journal Supplements (with 6 other MYStIX papers). Complete versions of all MYStIX papers are available at http://www.astro.psu.edu/mystix

References in corpus (18)

• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)
• X-Ray Spectroscopy of Stars
• Intrinsically Red Sources observed by Spitzer in the Galactic Mid-Plane
• X-ray Emission from T Tauri Stars and the Role of Accretion: Inferences from the XMM-Newton Extended Survey of the Taurus Molecular Cloud
• Overview of the Massive Young Star-Forming Complex Study in Infrared and X-ray (MYStIX) Project
• Identifying Young Stars in Massive Star-Forming Regions for the MYStIX Project
• X-ray properties of protostars in the Orion Nebula
• Embedded Star Formation in the Eagle Nebula with Spitzer/GLIMPSE
• The Diverse Stellar Populations of the W3 Star Forming Complex
• An X-ray Census of Young Stars in the Massive Southern Star-Forming Complex NGC 6357
• Spectacular Spitzer images of the Trifid Nebula: Protostars in a young, massive-star-forming region
• Bayesian Matching for X-ray and Infrared Sources in the MYStIX Project
• A Massive Young Star-Forming Complex Study in Infrared and X-ray: Mid-Infrared Observations and Catalogs
• The Wide-Field Near Infrared Data: Optimal Photometry in Crowded Fields
• The Progression of Star Formation in the Rosette Molecular Cloud
• Circumstellar Disks in the Outer Galaxy: the Star-Forming Region NGC 1893

Cited by in corpus (64)

• Kinematics in Young Star Clusters and Associations with Gaia DR2
• The Spatial Structure of Young Stellar Clusters. I. Subclusters
• Overview of the Massive Young Star-Forming Complex Study in Infrared and X-ray (MYStIX) Project
• Circumstellar Disk Lifetimes In Numerous Galactic Young Stellar Clusters
• SPICY: The Spitzer/IRAC Candidate YSO Catalog for the Inner Galactic Midplane
• Identifying Young Stars in Massive Star-Forming Regions for the MYStIX Project
• The Massive Star-forming Regions Omnibus X-ray Catalog
• Age Gradients in the Stellar Populations of Massive Star Forming Regions Based on a New Stellar Chronometer
• OB associations and their origins
• Core-Halo Age Gradients and Star Formation in the Orion Nebula and NGC~2024 Young Stellar Clusters
• The Spatial Structure of Young Stellar Clusters. II. Total Young Stellar Populations
• Protoplanetary disk masses in NGC 2024: Evidence for two populations
• Determining the recurrence timescale of long-lasting YSO outbursts
• Star Formation In Nearby Clouds (SFiNCs): X-ray And Infrared Source Catalogs And Membership
• X-ray Super-Flares From Pre-Main Sequence Stars: Flare Energetics And Frequency
• An initial overview of the extent and structure of recent star formation within the Serpens Molecular Cloud using Gaia Data Release 2
• The Spatial Structure of Young Stellar Clusters. III. Physical Properties and Evolutionary States
• Bayesian Matching for X-ray and Infrared Sources in the MYStIX Project
• Interactions of the Infrared bubble N4 with the surroundings
• FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) 2: Possible evidence for formation of NGC~6618 cluster in M17 by cloud-cloud collision
• Rapid Circumstellar Disk Evolution and an Accelerating Star Formation Rate in the Infrared Dark Cloud M17 SWex
• The Relationship between Mid-Infrared and Sub-Millimetre Variability of Deeply Embedded Protostars
• Star formation in W3 - AFGL333: Young stellar content, properties and roles of external feedback
• No evidence for protoplanetary disk destruction by OB stars in the MYStIX sample
• A Massive Young Star-Forming Complex Study in Infrared and X-ray: Mid-Infrared Observations and Catalogs
• Mass segregation and sequential star formation in NGC 2264 revealed by Herschel
• The Wide-Field Near Infrared Data: Optimal Photometry in Crowded Fields
• Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane
• Extreme infrared variables from UKIDSS - II. an end-of-survey catalogue of eruptive YSOs and unusual stars
• Multicolor Variability of Young Stars in the Lagoon Nebula: Driving Causes and Intrinsic Timescales
• Low-mass young stellar population and star formation history of the cluster IC 1805 in the W4 H{\sc ii} region
• Molecular Cloud Cores with High Deuterium Fraction: Nobeyama Single-Pointing Survey
• The Spatial Evolution of Young Massive Clusters II. Looking for Imprints of Star Formation in NGC 2264 with Gaia DR2
• The VISTA Carina Nebula Survey II. Spatial distribution of the infrared-excess-selected young stellar population
• Low Mass Stars as Tracers of Star and Cluster Formation
• A Novel Survey for Young Substellar Objects with the W-band filter II. The Coolest and Lowest Mass Members of the Serpens-South Star-forming Region
• Candidate X-ray-Emitting OB Stars in the MYStIX Massive Star-Forming Regions
• The Gaia-ESO Survey: dynamics of ionized and neutral gas in the Lagoon nebula (M8)
• The Duration of Star Formation in Galactic Giant Molecular Clouds. I. The Great Nebula in Carina
• Multiband Probabilistic Cataloging: A Joint Fitting Approach to Point Source Detection and Deblending
• Extended Red Objects and Stellar Wind Bow Shocks in the Carina Nebula
• YSO jets in the Galactic Plane from UWISH2: V - Jets and Outflows in M17
• Chandra Detection of An Evolved Population of Young Stars in Serpens South
• Young Stellar Populations in MYStIX Star Forming Regions: Candidate Protostars
• The distance to the Serpens South Cluster from H2O masers
• The JCMT Transient Survey: Single Epoch Transients and Variability of Faint Sources
• Spectroscopic Confirmation of a Population of Isolated, Intermediate-Mass YSOs
• The young stellar content of the giant HII regions M8, G333.6-0.2, and NGC6357 with VLT/KMOS
• FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN): Possible evidence of cloud-cloud collisions triggering high-mass star formation in the giant molecular cloud M16 (Eagle Nebula)
• Benchmarking the IRDC G351.77-0.53: Gaia DR3 distance, mass distribution, and star formation content
• The NEMESIS Catalogue of Young Stellar Objects for the Orion Star Formation Complex. I. General description of data curation
• XUE. JWST spectroscopy of externally irradiated disks around young intermediate-mass stars
• The Effect of Molecular Cloud Properties on the Kinematics of Stars Formed in the Trifid Region
• The extended population associated with W40
• A Novel Survey for Young Substellar Objects with the W-band filter III: Searching for very low mass brown dwarfs in Serpens South and Serpens Core
• The Ages of Optically Bright Sub-Clusters in the Serpens Star-Forming Region
• Circumstellar disk accretion across the Lagoon Nebula: the influence of environment and stellar mass
• IRAS 09002-4732: A Laboratory for the Formation of Rich Stellar Clusters
• Multiwavelength Studies of Young OB Associations
• Discovery of 22 GHz Water Masers in the Serpens South Region
• An X-ray View of Two Infrared Dark Clouds G034.43+00.24 and G035.39-00.33
• Multifrequency study of HH 137 and HH 138: Discovering new knots and molecular outflows with Gemini and APEX
• Evidence of triggered star formation in the Pillars of Creation from JWST observations
• S2D2: Small-scale Significant substructure DBSCAN Detection II. Tracing episodes and gradients of star formation activity