Spectral Analysis Pipeline for LAMOST Project

1
Spectral Analysis Pipeline for LAMOST Project

• A-Li Luo
• LAMOST Science Division
• NAOC, CAS

2
Content

• Brief Introduction about LAMOST Project
• Science goal of the LAMOST Survey
• The tasks of the Spectral Analysis
• The feature of LAMOST spectra
• The software system
• Some analysis algorithms
• Integrating the pipeline to VO ???

3
Brief Introduction about LAMOST Project

• Aperture 4m
• Focal length  20m
• Field of view5 degree
• Focal plane1.75m
• Number of fiber4000
• Spectra of objects as faint as 20m.5 with an
  exposure of 1.5 hour
• Range370nm-900nm
• Resolution R1000
• 2000

Focal Plane
MB Spherical Primary Mirror
MA Reflecting Schmidt Corrector
A meridian reflecting Schmidt telescope
4
Science goal of LAMOST

• Contribute to the study of extra-galactic
  astrophysics and cosmology, such as galaxies,
  quasars and the large-scale structure of the
  universe.
• Contribute to the study of stellar astrophysics
  and the Galaxy.
• Contribute to the cross-identification of
  multi-waveband of celestial objects.

5
The tasks of the 1-d Spectral Analysis
6
The Feature of LAMOST Spectra

• Large amount
• 10,000,000 galaxies
• 1,000,000 QSO
• Low S/N (especially at blue end)
• 20.m5 S/N lt 10
• Difficult to separate point objects from extended
  sources through PSF (too faint)
• No standard star in each field
• Redshifts affecting the classification

7
The Software System
Classification
Measurement
Pre- processing
Data Mining Knowledge discovery
Processing layer
Knowledge
Classified dataset
Normalized dataset
Raw dataset
Rare object dataset
Data layer
8
Some Analysis Algorithms

• Wavelet
• PCA, PCAZ
• ANN(SOFM, PNN, RBF)
• Hough
• HMM, EM
• SVM

9
How to Integrate LAMOST Spectra Analysis Pipeline
to VO

• We need
• Your advice
• Your experience
• Your technique support
• Thanks!!!