CAJ | 학술논문

恒星形成星系的恒星形成率与其恒星质量的相关关系被称为恒星形成星系主序关系，是描述星系演化的基本关系之一。准确测定不同红移处主序关系的斜率、弥散和零点能够对理解星系恒星形成活动的演化及其物理过程提供关键的观测限制。已有的研究揭示，恒星形成星系的整体恒星形成率从z ’2到z ’0下降为原值的1/30，气体消耗时标却由5亿年增至15亿年；主序关系的斜率在大质量和小质量星系段有变化，反映出决定恒星形成活动的物理过程有系统差别；而星系可能经历多个阵发性的恒星形成爆发活动，有助于更好地解释主序关系的弥散。随着观测能力的提升，对高红移宇宙(z ’1～3)的恒星形成星系的研究也更加深入。恒星形成星系主序关系的特征随红移的变化规律为理解星系演化提供关键的观测约束。
항성형성성계적항성형성솔여기항성질량적상관관계피칭위항성형성성계주서관계，시묘술성계연화적기본관계지일。준학측정불동홍이처주서관계적사솔、미산화영점능구대리해성계항성형성활동적연화급기물리과정제공관건적관측한제。이유적연구게시，항성형성성계적정체항성형성솔종z ’2도z ’0하강위원치적1/30，기체소모시표각유5억년증지15억년；주서관계적사솔재대질량화소질량성계단유변화，반영출결정항성형성활동적물리과정유계통차별；이성계가능경력다개진발성적항성형성폭발활동，유조우경호지해석주서관계적미산。수착관측능력적제승，대고홍이우주(z ’1～3)적항성형성성계적연구야경가심입。항성형성성계주서관계적특정수홍이적변화규률위리해성계연화제공관건적관측약속。
The tight correlation between star formation rates (SFRs) and stellar mass among star-forming galaxies (SFGs) is often referred to as the main sequence of SFGs, which is one of the fundamental relations involved in galaxy evolution. Characterizing the slope, normalization and scatter of the main sequence provides key constraints on our un-derstanding of the physical processes regulating star formation in galaxies. The global SFR drops by about a factor of 30 from z ’2 to z ’0, while the timescale of gas consumption increases from 0.5 × 109 to 1.5 × 109 years. The slope of the main sequence changes from the low-mass end to the high-mass end, indicating that the physical processes governing star formation are of dependence on galaxy stellar mass. The scenario of staged galaxy formation offers reasonable explanations for the scatter in specific SFR (SSFR). Starburst galaxies lying <br> off the main sequence with high SSFR contribute merely part of the cosmic star formation density, but probably play an important role in quenching star formation. Investigations of the main sequence of high-z SFGs requires much efforts with next generation observing facilities. The studies of the main sequence of SFGs thus provide key insights into galaxy formation and evolution.