PMAS Observing Campaign at the Calar Alto 3.5m Telescope: Kinematical feedback as origen of unusual Ly_ profiles in 4 ULIRGs

该观测计划将测量超发光红外星系(ULIRGs)样本中Halpha、Hbeta和[OIII]5007的发射线。尽管它们的尘埃含量和柱状密度极高，但它们释放出具有特殊线形的Ly-Alpha(与P-天鹅座相比)。它们的Ly-Alpha谱线轮廓显示出强烈的蓝移翅膀，速度高达-1000公里/S。可能是外流的激波气体导致了观察到的蓝移翅膀。利用PMAS观测，我们将追踪电离气体的速度场、消光和电离图。从Halpha出发，将使用膨胀气体壳层的辐射传输代码来推断固有的Ly-Alpha谱线。然后，通过与观测结果的比较，可以确定激波导致Ly-Alpha产量增加的区域。

The observing program will measure the emission lines of Halpha, Hbeta and [OIII] 5007 in a sample of ultra-luminous infrared galaxies (ULIRGs). Despite their extreme dust content and column densities, they emit Ly-alpha with peculiar line shapes (compared to P-Cygni). Their Ly-alpha line profiles exhibit strong blueshifted wings, with velocities up to -1000 km/s. Possibly outflowing, shocked gas is responsible for the observed blueshifted wings. With the PMAS observations, we will trace the velocity fields of the ionized gas, the extinction and ionization map. From Halpha, an intrinsic Ly-alpha line will be inferred using radiative transport codes of an expanding gas shell. A comparison with the observation will then allow to locate regions where shocks lead to an enhanced Ly-alpha production.