Star Formation and Technology Research In Manchester-1----中国科学院紫金山天文台

Seminar Title	Star Formation and Technology Research In Manchester

Speaker:	Prof. Gary Fuller

Affiliation:	(School of Physics & Astronomy)

When	Monday morning, July 29, 9:30 a.m.

Where:	Room 205 No.5 building , Xianlin campus (PMO, CAS)
	Welcome to Attend

	( PMO Academic Committee & Academic Circulating committee)

Abstract: This presentation will be in two parts. The first part will focus on recent work aimed at understanding the early evolution of massive protostars. High mass stars are primary drivers of galactic ecosystems and understanding their formation and early evolution is essential for building comprehensive models of star formation and galactic evolution. The Methanol MultiBeam (MMB) Survey has surveyed 234 degrees of longitude in galactic plane for 6.7 GHz Class II methanol masers and produced a catalogue of about 900 high mass protostars. A recent analysis of these sources which has for the first time allowed a detailed assessment of the evolutionary status of these objects will be discussed. These results will be explored in the context of the results of our ALMA survey of the chemical composition of the circumstellar environments of a sample of 38 high mass protostars. The goal of this ALMA programme is to establish a framework for using the chemical composition and structure of the circumstellar regions of high mass protostars as a diagnostic of their evolutionary stage.

The MMB survey and the ALMA astrochemical survey were only feasible due to the technical advances which allowed the construction of a multi-pixel receiver (for the MMB) and large spectral grasp receivers (on ALMA). The second part of this presentation will describe the capabilities and recent work of the Advance Radio Instrumentation Group (ARIG). The focus of this work is the production of state of the art low noise amplifiers (LNAs) using a range of commercial and forefront research fabrication processes. We will describe some of our recent advances in producing LNAs operating at frequencies up to 373 GHz and above. We will also describe our planned activities within a newly established collaboration with CETC38.