SIMBAD references

2009ApJS..184...18G - Astrophys. J., Suppl. Ser., 184, 18-83 (2009/September-0)

A Spitzer survey of young stellar clusters within one kiloparsec of the Sun: cluster core extraction and basic structural analysis.


Abstract (from CDS):

We present a uniform mid-infrared imaging and photometric survey of 36 young, nearby, star-forming clusters and groups using Spitzer IRAC and MIPS. We have confidently identified and classified 2548 young stellar objects (YSOs) using recently established mid-infrared color-based methods. We have devised and applied a new algorithm for the isolation of local surface density enhancements from point source distributions, enabling us to extract the overdense cores of the observed star-forming regions for further analysis. We have compiled several basic structural measurements of these cluster cores from the data, such as mean surface densities of sources, cluster core radii, and aspect ratios, in order to characterize the ranges for these quantities. We find that a typical cluster core is 0.39 pc in radius, has 26 members with infrared excess in a ratio of Class II to Class I sources of 3.7, is embedded in a AK= 0.8 mag cloud clump, and has a surface density of 60 pc–2. We examine the nearest neighbor distances among the YSOs in several ways, demonstrating similarity in the spacings between Class II and Class I sources but large member clusters appear more dense than smaller clusters. We demonstrate that near-uniform source spacings in cluster cores are common, suggesting that simple Jeans fragmentation of parsec-scale cloud clumps may be the dominant process governing star formation in nearby clusters and groups. Finally, we compare our results to other similar surveys in the literature and discuss potential biases in the data to guide further interpretation.

Abstract Copyright:

Journal keyword(s): infrared: stars - stars: formation - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/ApJS/184/18): table2.dat table4.dat>

Nomenclature: Table 4: [GMM2009] AFGL490 NNN (Nos 1-161), [GMM2009] BD+40 4124 NN (Nos 1-34), [GMM2009] CB34 NN (Nos 1-23), [GMM2009] Cep A NNN (Nos Cep A 1 to Cep A 96, Cep C 1 to Cep C 114), [GMM2009] Cha I NN (Nos 1-38), [GMM2009] CrA NN (Nos 1-35), [GMM2009] GGD NN NN (Nos GGD 4 1 to GGD 4 31, GGD 17 1 to GGD 17 53), [GMM2009] GGD 12-15 NNN (Nos 1-119), [GMM2009] ICNNNN NNN (Nos IC348 1 to 160, IC 5146 1 to 149), [GMM2009] IRAS HHMMm+DDMM NNN (Nos IRAS 06046-0603 1 to 26, IRAS 20050+2720 1 to 177), [GMM2009] LNNNN NN (Nos L1206 1 to 25, L1211 1 to 64), [GMM2009] L988-e NN (Nos 1-80), [GMM2009] LkHA 101 NNN (Nos 1-103), [GMM2009] Lupus III NN (Nos 1-39), [GMM2009] Mon R2 NNN (Nos 1-235), [GMM2009] MWC 297 NN (Nos 1-23), [GMM2009]NGC NNNN NNN (Nos NGC 1333 1 to 133, NGC 7129 1 to 58), [GMM2009] Oph LNNNN NNN (Nos Oph L1688 1 to 147, Oph L1689 1 to 5, Oph L1709 1 to 3), [GMM2009] SNNN NN (Nos S106 1 to 79, S131 1 to 13, S140 1 to 48, S171 1 to 48), [GMM2009] S140-North NN (Nos 1-24), [GMM2009] Serpens NN (Nos 1-97), [GMM2009] Tau LNNNN NN (Nos Tau L1495 1 to 39, Tau L1551 1 to 13), [GMM2009] VY Mon NN (Nos 1-49), [GMM2009] XY Per N (Nos 1-7).

Errata: erratum vol. 189, p. 352 (2010)

Simbad objects: 2602

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