[Alumnos] MAÑANA VIERNES CHARLA EN EL MERIDIANO de RIE MIURA

[Antonio Trípodi]

Mañana viernes 17 a las 10,30 RIE MIURA del Observatorio Nacional de Japón brindará una charla en el Salón Meridiano
sobre formación estelar secuencial. Están todos invitados

ABSTRACT:
The expansion of an HII region can trigger star formation.
One of these processes that gas accumulation and cloud collapse at the
edges of HII regions leads to star formation is called "collect and
collapse". The multi-wavelength studies have provided support to this
 process in smaller HII regions in our Galaxy, however, little is
known about the giant HII
regions (GHRs) which are often found in external galaxies. It is
important to know the possible
connection between ambient interstellar matter and the expansion of GHRs over
large distances (10² -10³ pc across) because GHRs play a vital role in
determining the large-scale structures of their host galaxies.
The talk will be discussed the possible star formation process in the
supergiant HII region NGC 604 in the nearby galaxy M33, based on our multi-line
observations such as CO(1-0), CO(3-2), HCN emissions, using Nobeyama
Millimeter Array, Nobeyama 45m telescope and Atacama Submillimeter Telescope
Experiment (ASTE) 10-m telescope.
Our high spatial resolution images of CO(1-0) emission allowed us to uncover 10
individual molecular clouds. Moreover, we detected for the first time
HCN emission in the two most massive clouds and 89 GHz continuum
emission at the rims of the
"H-alpha shells."
We also discovered a high CO(3-2)/CO(1-0) ratio gas with an arclike distribution
("high ratio gas arc") surrounding the central star cluster of the
supergiant HII region.
Furthermore, We found that the star formation efficiencies (SFEs) decrease with
increasing projected distance measured from the heart of the central
OB star cluster in NGC 604, suggesting radial changes in the
evolutionary stages of
the molecular clouds in the course of sequential star formation.
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