论文标题
处女座的环境调查追踪离子气体排放（versige）.vi。 HII区域量表上的环境淬火
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).VI. Environmental quenching on HII region scales
论文作者
论文摘要
处女座的环境调查追踪离子气体排放（versige）是对加拿大 - 弗伦奇 - 霍瓦伊望远镜（CFHT）的Megacam进行的处女座群集的盲窄带HALPHA+[NII]成像调查。我们使用从遗迹提取的一组新数据来研究敌对群集环境对恒星形成过程的影响，直到HII区域（〜50 PC）。确定了HII区域，并使用HIIPHOT代码在114个晚期星系中测量其参数，跨越形态类型（SA-SD，IM，BCD），恒星质量（10^6.5 <= M_Star <= 10^11 MO）和星形形成活性（10^-3 <-3 -3 <= sfr <= 10 mo yr yr^-1）。由于痕迹数据（0.65 arcsec）的精美平均分辨率，我们检测出具有HALPHA光度L（HALPHA）> = 10^37 ERG S^-1的11302 HII区域。我们表明，气体分裂物体中典型的HII区域数量明显低于相似恒星质量的健康晚期。我们还表明，在这些气体分裂的星系中，HII区域的数量显着下降了有效半径，这表明淬火过程发生在外部，与其他多频观察一致。这些新结果始终如一地证实，在集群星系中观察到的恒星形成活性减少的主要机制是RAM压力，这使我们能够丢弃其他温和的过程，例如饥饿或无法再现观察到的辐射截短的轮廓。
The Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) is a blind narrow-band Halpha+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the Canada-French-Hawaii telescope (CFHT). We use a new set of data extracted from VESTIGE to study the impact of the hostile cluster environment on the star formation process down to the scale of HII regions (~ 50 pc). HII regions are identified and their parameters measured using the HIIphot code on a sample of 114 late-type galaxies spanning a wide range in morphological type (Sa-Sd, Im, BCD), stellar mass (10^6.5 <= M_star <= 10^11 Mo), and star formation activity (10^-3 <= SFR <= 10 Mo yr^-1). Owing to the exquisite average resolution of the VESTIGE data (0.65 arcsec), we detect 11302 HII regions with an Halpha luminosity L(Halpha) >= 10^37 erg s^-1. We show that the typical number of HII regions in gas-stripped objects is significantly lower than in healthy late-types of similar stellar mass. We also show that in these gas-stripped galaxies the number of HII regions significantly drops outside the effective radius, suggesting that the quenching process occurs outside-in, in agreement with other multifrequency observations. These new results consistently confirm that the main mechanism responsible for the decrease of the star formation activity observed in cluster galaxies is ram pressure, allowing us to discard other milder processes such as starvation or strangulation unable to reproduce the observed radially truncated profiles.
