PGos3: the prototype version of the Legacy Tool

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PGos3 the prototype version of the Legacy Tool

• Roberto Terlevich
• INAOE, Puebla, Mexico and
• IoA, Cambridge, UK
• La Thuile, March 8th 2005

Elena Terlevich INAOE, Mexico Coordination
Miguel Cerviño IAA, Spain Coordination
Peter Anders Gottingen University, Germany
SSP galaxy modeling Emanuele Bertone INAOE,
Mexico Atmosphere Models Sandro
Bressan Observatorio di Padova, Italy SSP
galaxy modelling Uta Fritze-v.Alvensleben
Gottingen University, Germany SSP galaxy
modeling Jesús González INAOE, Mexico
Observational Databases, Data Mining Valentina
Luridiana IAA, Spain Conceptual design,
Documentation, Photoionization modelling Ángeles
López INAOE, Mexico System
support Aurelio López INAOE, Mexico
Conceptual design Miguel Martínez INAOE, Mexico
System support Christophe Morisset UNAM, Mexico
System development, VOTable management,
Photoionization models Enrique Pérez IAA, Spain
Conceptual design Carlos Rodrigo LAEFF, Spain
System development, PGos3 design and database
management, VOTable management Roberto Terlevich
INAOE, Mexico Conceptual design, Observational
Databases
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The need for a theory-data intelligent interface

• Many of the most fundamental problems in star
  cluster formation and evolution seem to be on the
  verge of solution by combining multi-wavelength
  observations with theoretical modelling that
  integrates stellar evolution, stellar dynamics,
  gas dynamics and chemical evolution, as well as
  the microphysics implicit in photo ionisation,
  radiative transfer, diffusion, dust formation and
  mixing, to name a few.
• Most groups so far have concentrated in either
  producing large quantities of data or model
  computing. The limitation in the approach means
  that only a small part of the phase space volume
  has been explored looking for solutions when
  comparing theory and observations.
• Substantial progress rests with methods that can
  deal simultaneously with large observational and
  theoretical datasets, i.e. megadatasets.
• Progress will therefore depends on improving not
  only the theory and observations but the
  interface between them. This is the area that we
  are actively exploring.
• As a first stage we are developing
  multiwavelenght Evolutionary Synthesis
  capability for megadatasets (3D spectroscopy).

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Evolutionary Synthesis

• Is a powerful tool to interpret the light of a
  stellar population (introduced by Tinsley 1968)
• Makes estimates of the history of star formation,
  chemical evolution and IMF
• During the last decade models have improved
  significantly using the latest evolutionary
  tracks and stellar libraries (Cervino Mas-Hesse
  1994Fioc Rocca-Volmerange 1997Leitherer et
  al. 1999Vazdekis 1999Buzzoni 2002Sculz et al.
  2002Bruzual Charlot 2003)
• However it is well known that the power of this
  method is extremely dependent on the reliability
  of the stellar models used as ingredients
  (Leitherer, Fritze-v.Alvensleben Huchra 1996).

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About the Legacy Tool

• We are building a sophisticated open-source
  software tool (the Legacy Tool'' ) that
  incorporates the most advanced theoretical
  high-resolution synthesis models of stellar
  populations, chemical evolution, abundance
  determination and chemo-dynamical models. The
  authors of the codes belong to this
  collaboration.
• This tool brings many dispersed efforts into a
  single access mode that will guide the user via a
  user-friendly interface.
• Includes modules of Data Mining and Machine
  learning algorithms to obtain from large
  databases the maximum of information in a fast
  and accurate manner.
• An interface is also planned, with chemical
  evolution, photoionization, chemodynamical and
  dynamical models. In addition, the LT will
  include a series of utilities for the analysis of
  both theoretical and observational data, e.g. the
  determination of colours from filters',
  extinction correctors, etc.

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PGos3 present status

• The main problem to solve when bringing to a
  common environment software that has been
  independently developed is that of communication
  and interoperability
• Moreover, the results from the models should have
  a format that allows easy comparison with the
  data.
• The solution VOtables
• A working prototype of the Legacy Tool, the PG0s3
  is being implemented in the IBM super-server of
  the INAOE Virtual Observatory
  http//ov.inaoep.mx/
• Already allows the comparison of the different
  ingredients and synthesis code results. Big
  surprises!!

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PGos3 Present Status
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NUV-Optical High Resolution _at_ 3Myr
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NUV-Optical High Resolution _at_ 3Myr
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Determination of Stellar Population Parameters in
Galaxies Using Active Instance-based Machine
Learning(Solorio et al 2005)Very Fast!
S/N5
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Residuals and Lick indeces
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PGos3 Second Stage
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PGos3 Third Stage
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THE BEGGINING
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AIMS

• Our group aims to provide the infrastructure to
  assemble interdisciplinary teams with the breath
  of expertise in computation, astrophysics,
  statistics, dynamics and visualization to exploit
  the anticipated massive data flow from future
  cosmology-related experiments, both ground and
  space based.