Spectroscopic FIR mapping of the disk and galactic wind of M82 with Herschel-PACS

Understand

[Abridged] We present maps of the main cooling lines of the neutral atomic gas ([OI] at 63 and 145 micron and [CII] at 158 micron) and in the [OIII] 88 micron line of the starburst galaxy M82, carried out with the PACS spectrometer on board the Herschel satellite.

• By applying PDR modeling we derive maps of the main ISM physical parameters, including the [CII] optical depth, at unprecedented spatial resolution (~300 pc).
• We can clearly kinematically separate the disk from the outflow in all lines.
• The [CII] and [OI] distributions are consistent with PDR emission both in the disk and in the outflow.