Measuring the diffuse ionized gas in galaxies

测量星系中的扩散电离气体

• 批准号: 395587141
• 负责人: Professor Dr. Martin Matthias Roth
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/395587141?language=en
• 关键词: Measuring; diffuse; ionized; gas; galaxies

The goal of this project is to perform deep PMAS observations of low Halpha surface brightness regions in nearby galaxies to shed light on the nature of the diffuse ionized gas (DIG) component that has often been attributed to Lyman continuum radiation leaking from HII regions. Recent evidence obtained with the MUSE instrument at the VLT is suspiciously pointing to a possible shock excitation origin of the DIG rather than photoionization. We shall utilize the high efficiency of PMAS for low intensity emission to map out regions close to and farther away from luminous HII regions in several nearby galaxies in order to constrain the likely cause for ionization as observable in Halpha, Hbeta, [OI],[OII][OIII],[NII],[SII].

该项目的目标是对邻近星系的低半星表面亮度区域进行深入的PMAS观测，以阐明漫射电离气体（DIG）成分的性质，这种成分通常被归因于从HII区域泄漏的莱曼连续辐射。最近用VLT上的MUSE仪器获得的证据令人怀疑地指向了DIG可能的激波激发起源，而不是光电离。我们将利用PMAS对低强度发射的高效率来绘制几个附近星系中离发光的HII区域近和远的区域，以便约束在Halpha， Hbeta, [OI],[OII],[OIII],[NII]，[SII]中观测到的电离的可能原因。