Deep imaging of rich clusters in W5

Details Deep imaging of rich clusters in W5 Deep imaging of rich clusters in W5

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40448f&link_type=abstract

Spitzer Proposal ID #40448

Computer Science

Scientific paper

W5 is part of the well-known chain of large HII regions in the Perseus arm, W3/W4/W5; however it is well segregated from W3/W4. At a distance of 2 kpc, W5 is comprised of multiple overlapping bubbles of ionized gas, extending over 2 x 1.5 degrees on the sky. We have recently uncovered previously unknown dense clusters surrounding massive O stars in the interior of the W5 star forming region with IRAC and MIPS observations. We propose to obtain deep images of these clusters with IRAC in an effort to improve both the signal to noise of the stars we detect in these clusters, and the spatial resolution of our observations. This will help us to compare more directly with our near-IR and optical data for the same dense clusters, and better understand their mass functions and ages. This in turn will enable us to measure more accurately the age sequence of star clusters across all of W5 and understand if triggering is a possible mechanism to explain this sequence. The proposed observations will improve the sensitivity of our existing IRAC observations by a factor of 4.

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