Optimization of synthetic galaxy spectra. Application to ESA's Gaia mission

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

1

Methods: Statistical, Methods: Data Analysis, Galaxies: Fundamental Parameters

Scientific paper

Aims: We present an optimized library of synthetic galaxy spectra that are to be used for the Gaia satellite observations of unresolved galaxies. These galaxy spectral templates are useful for the optimal performance of the unresolved galaxy classifier (UGC) software. The UGC will assign spectral classes to the observed unresolved galaxies by Gaia (classification) and estimate some of their intrinsic astrophysical parameters, which were used to create the synthetic library (parametrization). We present the new optimized synthetic library of galaxy spectra and the classification and parametrization results using the Gaia-simulated version of this library. Methods: To optimize our synthetic library, we applied the principal component analysis (PCA) method to our synthetic spectra and studied the influence of the star-formation rate parameters on the spectra, and how these agree with some typical characteristics of the galaxy spectral types. We used support vector machines (SVM) to classify and parametrize the optimal simulated spectra. Results: The library of synthetic galaxy spectra was optimized. In this new set of synthetic spectra, overlaps in spectral energy distributions and colors are highly suppressed, while the results of UGC classification are improved.
The optimum synthetic galaxy spectra are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/538/A38

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Optimization of synthetic galaxy spectra. Application to ESA's Gaia mission does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optimization of synthetic galaxy spectra. Application to ESA's Gaia mission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optimization of synthetic galaxy spectra. Application to ESA's Gaia mission will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-887332

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.