Star Formation In Nearby Clouds (SFiNCs): X-Ray and Infrared Source Catalogs and Membership

Abstract

The Star Formation in Nearby Clouds (SFiNCs) project is aimed at providing a detailed study of the young stellar populations and of star cluster formation in thenearby 22 star-forming regions (SFRs) for comparison with our earlier MYStIX survey of richer, more distant clusters. As a foundation for the SFiNCs science studies, here, homogeneous data analyses of the Chandra X-ray and Spitzer mid-infrared archival SFiNCs data are described, and the resulting catalogs of over 15,300 X-ray and over 1,630,000 mid-infrared point sources are presented. On the basis of their X-ray/infrared properties and spatial distributions, nearly 8500 point sources have been identified as probable young stellar members of the SFiNCs regions. Compared to the existing X-ray/mid-infrared publications, the SFiNCs member list increases the census of YSO members by 6%-200% for individual SFRs and by 40% for the merged sample of all 22 SFiNCs SFRs.

Gaia stellar kinematics in the head of the Orion A cloud: runaway stellar groups and gravitational infall

“…Column 2 indicates if the Gaia source is part of one of the aforementioned six optical/IR/X-ray catalogues of young stars. Among the 1487 Gaia stars, 528, 532, 633, 357, 1185, and 568 are in MYStIX/SFiNCs (Broos et al 2013;Getman et al 2017 2016) and our AgeJX estimate based on X-ray and near-IR photometry (Getman et al 2014a(Getman et al , 2017; the latter is only applicable to low-mass stars. Both types of ages are corrected for individual Gaia parallaxes and calibrated to isochrones by Siess et al (2000).…”

“…To produce a rich sample of Gaia young stars in the Orion A region we combine data from several different young stellar catalogues. We utilize X-ray/IR data from the Star Formation in Nearby Clouds project (SFiNCs; Getman et al 2017) and the Chandra Orion Ultradeep Project (COUP; Getman et al 2005); the latter is part of the Massive Young Star-Forming Complex Study in Infrared and X-ray (MYS-tIX; Feigelson et al 2013;Broos et al 2013). The COUP-MYStIX observations, centered on the Trapezium core of the ONC cluster, cover about 17 × 17 arcmin 2 area on the sky (Getman et al 2005, their Figure 2).…”

“…The COUP-MYStIX observations, centered on the Trapezium core of the ONC cluster, cover about 17 × 17 arcmin 2 area on the sky (Getman et al 2005, their Figure 2). The SFiNCs observations encompass the NGC 1977, OMC-2/3, and OMC-4 regions (Getman et al 2017, their Figure Set 1), covering three 17×17 arcmin 2 and three roughly 20×30 arcmin 2 areas with Chandra and Spitzer, respectively. We add optical/IR young stars from Fűrész et al (2008) and Tobin et al (2009) that were selected on the basis of their 2MASS, Spitzer-IRAC, radial velocity, and Hα emission properties.…”

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

“…Three of these objects have spectral types later than M4 spectral type and evidence of youth from peaky H-band pseudo-continuum spectral morphology. All four objects have IR excess emission, indicating the likely presence of circumstellar disks around them (Getman et al 2017;Dunham et al 2015). One of the four candidate low-mass members in our list, SERP182918-020245, exhibits P aβ and Brγ emission which confirms its youth and ongoing magnetospheric accretion.…”

“…The presence of circumstellar disks provides additional evidence of the youth and membership of those objects. Additionally, the above four targets, ie., SERP183044-020918, SERP182918-020245, SERP183038-021419 and SERP182917-020340 are listed as young stellar objects in the SFiNCs Xray-Infrared catalog by Getman et al (2017) as well as in Gould Belt Survey by Dunham et al (2015). The IR excess confirm the youth and likely membership of these candidate low mass targets in Serpens-South.…”