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MYStIX (Massive Young Star-Forming Complex Study in Infrared and X-ray) is a project to synthesize multi-wavelength (mostly archival) photometric data on 20 young clusters within d<4 kpc to obtain new censuses of cluster stars and images of nebular emission. SFiNCs (Star Formation in Nearby Clouds) in an extension of the project to 22 smaller star forming regions within d<1kpc. The science goals are to improve our understanding of clustered star formation, early cluster dynamics, OB star feedback processes, triggered star formation, star formation histories, survivability of protoplanetary disks, and related topics. The central datasets are from Chandra ACIS, UKIRT/UKIDSS WFCAM & 2MASS, and Spitzer IRAC surveys. By combining infrared- and X-ray selected cluster members, both disk-bearing (Class I and II) and disk-free (Class III) young stars are identified, as well as OB stars. Samples of 31,784 MYStIX Probable Complex Members (MPCMs) and 8,492 SFiNCs Probable Members (SPCM) are obtained. By removal of X-ray sources, diffuse X-ray emission suffusing HII regions is revealed. This Web site provides to the public papers, electronic sources tables, and selected presentations from the MYStIX & SFiNCx projects.

Members of the MYStIX & SFiNCs team:

    • Leaders:  Eric Feigelson, Leisa Townsley & Konstantin Getman.   MYStIX contact:  SFiNCs contact: 
    • Penn State:  Patrick Broos, Heather Busk, Eric Feigelson, Konstantin Getman, Kevin Luhman, Alexander Richert, Leisa Townsley
    • University of Valparaiso: Michael Kuhn
    • Cal State Pomona:  Matthew Povich
    • University of Exeter:  Matthes Bate, Robert King, Mark McCaughrean, Tim Naylor
    • McMaster University:  Ralph Pudritz, Alison Sills, James Wadsley

MTYStIX science papers:

The Spatial Structure of Young Stellar Clusters. I. Subclusters Astrophys. J., 787:107 (Kuhn, Getman, Feigelson, Baddeley, Townsley, Broos, Sills, Bate, Povich, Luhman, Busk, Naylor, King, Song)

Subcluster membership electronic table: Table 3

R scripts and associated files:  sourcecode.tar

Age Gradients in Stellar Populations of Massive Star Forming Regions Based on a New Stellar Chronometer Astrophys. J., 787:108, 2014 (Getman, Feigelson, Kuhn, Broos, Townsley, Naylor, Povich, Luhman, Garmire)

Individual star age estimates:  Table 1

Core-Halo Age Gradients and Star Formation in the Orion Nebula and NGC 2024 Young Star Clusters Astrophys. J., 787:109, 2014 (Getman, Feigelson, Kuhn)

Core-halo gradients electronic table: Table 1

Press release (May 2014)

The Spatial Structure of Young Stellar Clusters. II. Total Young Stellar Populations Astrophys. J., 802, #60, 2015 (Kuhn, Getman, Feigelson)

Total population electronic table: Table 2

 FITS files for spatial distribution maps:  Figure 3  Figure 5

The Spatial Structure of Young Stellar Clusters. III. Physical Properties and Evolutionary States Astrophys. J., 812, #131, 2015 (Kuhn, Feigelson, Getman, Sills, Bate, Borissova)
No Evidence for Protoplanetary Disk Destruction by OB Stars in the MYStIX Sample Astrophys. J., 811, #10, 2015 (Richert, Feigelson, Getman, Kuhn)

Young Stellar Populations in MYStIX Star Forming Regions: Candidate Protostars Astrophys. J., 833, #193, 2016 (Romine, Feigelson, Getman, Kuhn, Povich)

MYStIX Candidate Protostars (MCP): Table 2 and Table 3 (footnotes)

Candidate X-ray Emitting OB Stars in the MYStIX Massive Star-Forming Regions Astrophys. J., 838, #61, 2017 (Povich, Busk, Feigelson, Townsley, Kuhn)

MYStIX Candidate OB stars (MOBc): Table 2, Table 3, Table 4


Multiwavelength Studies of Young OB Clusters [MYStIX review article], to appear in The Birth of Star Clusters (Stahler editor), 2017  (Feigelson)


SFiNCs & related articles:

Star Formation in Nearby Clouds (SFiNCs). I. X-ray and Infrared Source Catalogs and MembershipAstrophys. J. Suppl., 229, #28 2017 (Getman, Broos, Kuhn, Feigelson, Richert, Ota, Bate, Garmire)

SFiNCs electronic tables: Table 3, Table 4, Table 5, Table 6, Table 7, Table 8

The Young Star Cluster NGC 6231: Stellar Population, Astrophys. J., 154, #87, 2017 (Kuhn, Medina, Getman, Feigelson, Gromadzki, Borissova, Kurtev)
NGC 6231 CXOVVV sample: Table 1, Table 3, Table 4
The Young Star Cluster NGC 6231: Structure, Formation and Fate, Astrophys. J. in press 2017 (Kuhn, Getman, Feigelson, Sills, Gromadzki, Medina, Borissova, Kurtev)
Star Formation in Nearby Clouds (SFiNCs): II. Sub-clusters and their Properties, Astrophys. J. submitted 2017 (Getman, Kuhn, Feigelson, Broos, Bate, Garmire) 

MYStIX Technical/catalog papers:


Overview of the Massive Young Star-Forming Complex Study in Infrared and X-ray (MYStIX) Project Astrophys. J. Suppl. 209:26, 2013  (Feigelson, Townsley, Broos, Busk, Getman, King, Kuhn, Naylor, Povich, Baddeley, Bate, Indebetouw, Luhman, McCaughrean, Pittard, Pudritz, Sills, Song & Wadsley)

A Massive Young Stellar Complexes Study in the Infrared and X-ray: X-ray Sources in Ten Star Forming Regions Astrophys. J. Suppl. 209:27, 2013  (Kuhn, Getman, Broos, Townsley & Feigelson)

Chandra source electronic table:  mystix_xray_catalog.fits

The Massive Star-Forming Regions Omnibus X-ray Catalog Astrophys. J. Suppl., 213:1, 2014 (Townsley, Broos, Garmire, Bouwman, Povich, Feigelson, Getman, Kuhn)

Chandra source electronic table:  Forthcoming

The MYStIX Wide-Field Near Infrared Data: Optimal Photometry in Crowded Fields Astrophys. J. Suppl. 209:28, 2013   (King, Naylor, Broos, Getman & Feigelson)

UKIRT source electronic table: ApJS485823_table2.fits (1.39 GB)


Massive Young Star-Forming Study in Infrared and X-rays: Mid-Infrared Observations and Catalogs Astrophys. J. Suppl. 209:29, 2013  (Kuhn, Povich, Luhman, Getman, Busk, Feigelson)

Spitzer source electronic tables:  apjs486044t2_mrt.txt and apjs486044t3_mrt.txt (78 MBy)

Bayesian Matching for X-ray and Infrared Sources in the MYStIX Project Astrophys. J. Suppl. 209:30, 2013   (Naylor, Broos & Feigelson)

X-ray/IR source matches electronic table:  ApJS485822table2a.fits and ApJS485822table2b.fits

The MYStIX InfraRed-Excess Source Catalog Astrophys. J. Suppl. 209:31, 2013   (Povich, Kuhn, Getman, Feigelson, Busk, Broos, Townsley, King, Naylor)

MIRES (MYStIX InfraRed-Excess Source) figure set: Fig 9

MIRES electronic tables:  MIRES_table3.fits

Identifying Young Stars in the MYStIX Project Astrophys. J. Suppl. 209:32, 2013  (Broos, Getman, Povich, Feigelson, Townsley, Naylor, Kuhn, King & Busk)

MPCM (MYStIX Probable Complex Member) electronic table: apjs485825_MPCM.fits



A New X-ray/Infrared Age Estimator for Young Stellar Clusters (Getman et al., poster, Protostars & Protoplanets VI, 2013)

Subclusters of Young stars in Massive Star Forming Regions (Kuhn et al., poster, Protostars & Protoplanets VI, 2013)

X-ray insights into the origin of star clusters (Feigelson, Getman & Kuhn, invited talks, AAS High Energy Astrophysics Division meeting, 2014)

MYStIX: New Insights into Clustered Star Formation (Feigelson, slides, 2016)

Intracluster age gradients and disk longevities in MYStIX and SFiNCs young stellar clusters (Getman, slides, 2017)

NGC 6231: Structure, evolution and fate (Kuhn, slides, 2017)