PMAS observations at the Calar Alto 3.5m Teleskop: Measuring the diffuse ionized gas in galaxies

Calar Alto 3.5m 望远镜的 PMAS 观测：测量星系中的扩散电离气体

• 批准号: 418526966
• 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: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/418526966?language=en
• 关键词: PMAS; observations; Calar; Alto; 3.5m

The project intends 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 Ha, Hb, [OI],[OII][OIII],[NII],[SII].

该项目打算对附近星系的低Halpha表面亮度区域进行深PMAS观测，以揭示通常归因于HII区域泄漏的莱曼连续辐射的扩散电离气体成分的性质。最近在VLT用MUSE仪器获得的证据可疑地指向DIG的可能的冲击激发起源，而不是光电离。我们将利用PMAS对低强度发射的高效率，在几个邻近星系中绘制出接近和远离发光HII区的区域，以限制在Ha，Hb，[OI]，[OII][OIII]，[NII]，[SII]中可观察到的电离的可能原因。