SIMBAD references

2012ApJ...755L..30A - Astrophys. J., 755, L30 (2012/August-3)

Ultracompact embedded clusters in the galactic plane.


Abstract (from CDS):

We have identified a previously unrecognized population of very compact, embedded low-mass Galactic stellar clusters. These tight (r ~ 0.14 pc) groupings appear as bright singular objects at the few arcsecond resolution of the Spitzer Space Telescope at 8 and 24 µm but become resolved in the sub-arcsecond UKIDSS images. They average six stars per cluster surrounded by diffuse infrared emission and coincide with 100-300 Mclumps of molecular material within a larger molecular cloud. The magnitudes of the brightest stars are consistent with mid- to early-B stars anchoring ∼80 M star clusters. Their evolutionary descendants are likely to be Herbig Ae/Be pre-main-sequence clusters. These ultracompact embedded clusters (UCECs) may fill part of the low-mass void in the embedded cluster mass function. We provide an initial catalog of 18 UCECs drawn from infrared Galactic plane surveys.

Abstract Copyright:

Journal keyword(s): infrared: stars - open clusters and associations: general - stars: pre-main sequence

Nomenclature: Table 1: [AK2012] NN (Nos 1-18).

Simbad objects: 19

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