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ALMA Study of the Lensed Galaxy SDP.81

Zamri Z. Abidin --- Zainab K. Naser Alla --- Sadeem Abbas Fadhil --- Jazeel H. Azeez

Al-Nahrain Journal of Science مجلة النهرين للعلوم
ISSN: (print)26635453,(online)26635461 Year: 2018 Volume: 00 Issue: 1 Pages: 69-71
Publisher: Al-Nahrain University جامعة النهرين

Abstract

In this paper we present high resolution data from Atacama Large Millimeter /sub-millimeter Array (ALMA) of CO (5-4) and CO (8-7) rotational transitions toward the gravitational lensed galaxy (SDP.81). We calculate the molecular gas mass in the clumpy region which is around 1.5109 Mʘ. We overly the CO(8- 7) and CO(5- 4) intensity distributions to calculate the brightness temperature ratio R85 at various region. The CO line ratio was in the range between 0.39 and 0.75 with an average value about 0.48. This line ratio suggests that most sub-millimeter galaxies, SMGs, include a significant proportion of extended, moderate-density, cool gas.

Keywords

Galaxies --- High redshift --- ALMA --- SDP.81.