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11–15 Jun 2018
Geological Museum, University of Copenhagen
Europe/Copenhagen timezone

PDRs with JWST: Probes of dust formation and evolution

14 Jun 2018, 10:20
20m
Main Auditorium (Geological Museum, University of Copenhagen)

Main Auditorium

Geological Museum, University of Copenhagen

Øster Voldgade 5 - 7, 1350 København K, Denmark
Poster Dust as a tool Poster Presentations

Speaker

Karl Misselt (University of Arizona)

Description

Photodissociation regions (PDRs) are predominantly neutral regions of the ISM in which
the heating and chemistry are mainly regulated by far ultraviolet photons emitted from
one or more nearby young stars. They are extended regions at the interface between
the ionizing sources and molecular clouds, and contain dense structures and clumps of
dust and gas immersed in a more diffuse medium. Dust at the PDR interface experiences
extreme physical conditions, with temperatures and densities varying by orders of
magnitude over very small spatial scales, of order a few hundred AU. Hence the PDR
interface provides a unique opportunity to study (1) dust formation as a function of
environment, from the ionized region in front of the PDR to the dense regions behind the PDR
(2) the destruction and evolution of grain mantles/clusters in the transition region,
(3) the role of dust in regulating molecular chemistry (e.g. H2 formation on grain surfaces),
and (4) the potential identification of grain composition via excitation studies.
In light of the potential impact PDRs have on our understanding of dust properties and their
interdependence with the gaseous and molecular phase, the JWST NIRCam and MIRI GTO teams have
proposed a joint GTO program to study two nearby PDRs, NGC 7023 and the Horsehead nebula,
using a suite of instruments and modes on JWST. These emblematic PDRs have different
excitation conditions and relatively simple geometries and are ideal targets to take full
advantage of the high spatial resolution and sensitivity of JWST. In this poster, we
describe the observing strategy for our GTO program and briefly describe several of the
science goals of the team.

Consider for a poster? Yes

Primary authors

Karl Misselt (University of Arizona) Karl Gordon (STScI) Alain Abergel (IAS) Alberto Noriega-Crespo (STScI) Tea Temim (STScI) Heddy Arab (Univesity of Strasbourg) Maaren Baes (Uneversiteit Gent) Henrik Beuther (MPIA Heidelberg) Patrice Bouchet (CEA-Saclay) Bernhard Brandle (Sterrewacht Leiden) Peirre Guillard (Institue d'Astrophysique de Paris) Sarah Kendrew (ESA) Pamela Klaasen (UK ATC) Dries Van de Putte (Universiteit Gent) Adolf Witt (University of Toledo)

Presentation materials

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