Volume 542, June 2012
GREAT: early science results
|Number of page(s)||4|
|Published online||10 May 2012|
Dynamics and photodissociation region properties in IC 1396A
1 I. Physikalisches Institut der Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
3 Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Straße 2, 37191 Katlenburg-Lindau, Germany
4 Deutsches Zentrum für Luft- und Raumfahrt, Institut für Planetenforschung, Rutherfordstraße 2, 12489 Berlin, Germany
5 Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
Received: 30 January 2012
Accepted: 2 March 2012
Aims. We investigate the gas dynamics and the physical properties of photodissociation regions (PDRs) in IC 1396A, which is an illuminated bright-rimmed globule with internal structures created by young stellar objects.
Methods. Our mapping observations of the [C ii] emission in IC 1396A with GREAT onboard SOFIA revealed the detailed velocity structure of this region. We combined them with observations of the [C i] 3P1−3P0 and CO(4–3) emissions to study the dynamics of the different tracers and physical properties of the PDRs.
Results. The [C ii] emission generally matches the IRAC 8 μm, which traces the polycyclic aromatic hydrocarbon (PAH) emissions. The CO(4–3) emission peaks inside the globule, and the [C i] emission is strong in outer regions, following the 8 μm emission to some degree, but its peak is different from that of [C ii]. The [C ii] emitting gas shows a clear velocity gradient within the globule, which is not significant in the [C i] and CO(4–3) emission. Some clumps that are prominent in [C ii] emission appear to be blown away from the rim of the globule. The observed ratios of [C ii]/[C i] and [C ii]/CO(4–3) are compared to the KOSMA-τ PDR model, which indicates a density of 104–105 cm-3.
Key words: ISM: lines and bands / photon-dominated region (PDR) / ISM: individual objects: IC 1396
© ESO, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.