Arcetri scientists participate in three Herschel Open-Time (OT) Key Projects:
one Galactic, and two extragalactic which regard populations of galaxies in the
Hi-Gal: Herschel Infrared Galactic Plane Survey
PI: Sergio Molinari (INAF-IFSI, Italy)
(OAA CoI's: Maite Beltran, Riccardo Cesaroni, Fabrizio Massi, Luca Olmi, Leonardo Testi)
This project has been granted 343 hours of Herschel time to perform an
unbiased survey of the portion of the Galactic plane satisfying the galactic
longitude and latitude constraints |l|<60deg and |b|<1deg. This is the
same region covered by the GLIMPSE and MIPSGAL surveys with SPITZER.
The observations will make use of PACS and SPIRE in parallel mode to image
the continuum emission from dust in the wavelength range 70-520 micron.
Hi-Gal is mostly focused on the problem of Galactic star formation, although
a plethora of evolved stars will be also detected in the survey.
The main goals of the project are the following:
To determine the distribution of the interstellar medium temperature
and the intensity of the interstellar radiation field
To measure the physical parameters of cold dust and study the formation
of molecular clouds
To determine the formation mechanism and early evolution of O-B type stars
To relate the local star formation rate and efficiency to the global star
formation indicators on the Galactic scale.
HeViCS - Herschel Virgo Cluster Survey
PI: Jonathan I. Davies (Cardiff University, UK)
(OAA CoI's: Simone Bianchi, Edvige Corbelli,
Sperello di Serego, Marco Grossi, Carlo Giovanardi, Leslie Hunt)
HeViCS is a deep imaging program (286 hours) to observe 60 square degrees
centered on the Virgo cluster. It will use PACS and SPIRE in
parallel mode. Observations will be confusion noise limited
in all SPIRE bands.
The main goals are:
Observation of dust emission from the intra-cluster medium
Observations of dust emission from the outer extent of galaxies
and from associate gas flows.
Study of FIR/submm emission in galaxies to determine the relative
distribution of dust and stars, the amount of internal extinction,
the dust mass and the relation between IR radiation and star
formation in objects of different morphological types.
Determination of the FIR/submm luminosity function of galaxies in
the cluster, and comparison with field samples from other Herschel
Dust emission properties in irregular dwarf galaxies, seen as
local templates of high-z objects.
Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel (KINGFISH)
PI: Robert C. Kennicutt, Jr. (Cambridge University, UK)
(OAA CoI's: Leslie Hunt)
The KINGFISH project is an imaging and spectroscopic survey of 61 nearby galaxies
chosen to span the full range of integrated properties and local interstellar
medium (ISM) environments found in the local Universe.
Principal science questions to be addressed by the KINGFISH team include the link
between star formation and the ISM, the inventory of dust and cold gas in
galaxies, and the cooling of the interstellar medium.
The broad goals of KINGFISH are to:
Characterize the interstellar media of present-day galaxies
Place physical constraints on the heating and cooling of their gaseous and dust
Better understand the physical processes linking star formation to the ISM.
KINGFISH will also provide the Herschel community with a comprehensive
library of far-infrared imaging and spectral line maps of local galaxies
and their principal infrared emitting components, all integrated with the
extensive multi-wavelength dataset from the
Spitzer Infrared Nearby Galaxies Survey (SINGS),
the foundation sample for the project.