IRAC imaging of Protocluster AFGL 5157 (NH3)

Details IRAC imaging of Protocluster AFGL 5157 (NH3) IRAC imaging of Protocluster AFGL 5157 (NH3)

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50244f&link_type=abstract

Spitzer Proposal ID #50244

Physics

Scientific paper

Formation of star in groups and/or clusters is one of the most important but unanswered questions in the study of galactic star formation. AFGL 5157 (NH3) is a unique case undergoing present cluster formation, as proved by the following key facts: (1), There is no detectable NIR point source within the loci of dense NH3 core, known from recent ground-base NIR imaging but a radio continuum source and some H2O masers were found within the core. (2) Within the NH3 core, multiple H2 jets have been found and about 10 protostellar objects are responsible for the jets; (3), NMA and SMA detected 14 dust continuum point sources at 3sigma level of 2 mJy/beam. (4) High-resolution CO imaging at NMA found a collimated CO jet well matching one of the major NIR H2 jet. In this study, we propose to observe AFGL 5157 (NH3) by IRAC deep Imaging, Our major purposes are as following: (1), To detect the cluster by IRAC and to conduct photometry and to establish the SED of Class 0/1 objects. (2) To build the luminosity function of the cluster, which, combined with the ground-base observations on the distribution of protostellar members, should be able to provide, the first of its kind, luminosity function of a cluster under formation. (3), To make deep imaging for the jets and outflows within the region. The results will provide crucial information to locate the evolutionary status of each cluster member.

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