Stellar population models at high spectral resolution

Details Stellar population models at high spectral resolution Stellar population models at high spectral resolution

2011-09-02

arxiv.org/abs/1109.0543v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

30 pages, 36 figures, Monthly Notices of the Royal Astronomical Society in press

Scientific paper

We present new, high-to-intermediate spectral resolution stellar population models, based on four popular libraries of empirical stellar spectra, namely Pickles, ELODIE, STELIB and MILES. These new models are the same as our previous models, but with higher resolution and based on empirical stellar spectra, while keeping other ingredients the same including the stellar energetics, the atmospheric parameters and the treatment of the Thermally-Pulsating Asymptotic Giant Branch and the Horizontal Branch morphology. We further compute very high resolution (R=20,000) models based on the theoretical stellar library MARCS which extends to the near-infrared. We therefore provide merged high resolution stellar population models, extending from ~1000 AA to 25,000 AA. We compare how these libraries perform in stellar population models and highlight spectral regions where discrepancies are found. We confirm our previous findings that the flux around the V-band is lower (in a normalised sense) in models based on empirical libraries than in those based on the BaSeL-Kurucz library, which results in a bluer B-V colour. Most noticeably the theoretical library MARCS gives results fully consistent with the empirical libraries. This same effect is also found in other models using MILES, namely Vazdekis et al. and Conroy & Gunn, even though the latter authors reach the opposite conclusion. The bluer predicted B-V colour (by 0.05 magnitudes in our models) is in better agreement with both the colours of Luminous Red Galaxies and globular cluster data. We test the models on their ability to reproduce, through full spectral fitting, the ages and metallicities of galactic globular clusters as derived from CMD fitting and find overall good agreement. {Abridged}

Affiliated with

Also associated with

No associations

Rating

Stellar population models at high spectral resolution 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 Stellar population models at high spectral resolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar population models at high spectral resolution will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-147211