Hubble Space Telescope NICMOS Imaging of W3 IRS 5: A Trapezium in the Making?

Details Hubble Space Telescope NICMOS Imaging of W3 IRS 5: A Trapezium in the Making? Hubble Space Telescope NICMOS Imaging of W3 IRS 5: A Trapezium in the Making?

2005-02-17

arxiv.org/abs/astro-ph/0502358v2

Astrophys.J. 622 (2005) L141-L144

Astronomy and Astrophysics

Astrophysics

accepted to ApJ letters

Scientific paper

10.1086/429720

We present Hubble Space Telescope NICMOS imaging of W3 IRS 5, a binary high-mass protostar. In addition to the two protostars, NICMOS images taken in the F222M and F160W filters show three new 2.22 micron sources with very red colors; these sources fall within a region 5600 AU in diameter, and are coincident with a 100 solar mass dense molecular clump. Two additional point sources are found within 0.4'' (800 AU) of one of the high-mass protostars; these may be stellar companions or unresolved emission knots from an outflow. We propose that these sources constitute a nascent Trapezium system in the center of the W3 IRS 5 cluster containing as many as five proto OB stars. This would be the first identification of a Trapezium still deeply embedded in its natal gas.

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