GRASIL (which stands for GRAphite and SILicate), is a code to compute the spectral evolution of stellar systems taking into account the effects of dust, which absorbs and scatters optical and UV photons and emits in the IR-submm region. Of course it may be used as well to do “standard” no-dust stellar spectral synthesis.

The code is under continuous development but yet very well calibrated and applied to interpret galaxies at different redshifts. Follow the links below to find out more information about GRASIL, in particular to download executables and learn how to run it.

GRASIL can now be very conveniently run on local machines using our GALSYNTH WEB interface. After you know what GRASIL does, have a look to the help on GALSYNTH and register (just name and email) to get immediate access.

If you use  GRASIL to produce scientific work, we kindly ask you to reference the original GRASIL paper Silva, L., Granato, G.L., Bressan, A., Danese, L., 1998, ApJ, 509, 103 .


People: Laura Silva, Gian Luigi Granato, Alessandro BressanPasquale PanuzzoOlga Vega

Our original model is described in the paper Silva, L., Granato, G.L., Bressan, A., Danese, L., 1998, ApJ, 509, 103.

More details on GRASIL and applications are in Laura's PhD thesis (SISSA, Trieste, October 1999).

Further GRASIL updates and descriptions are in: Bressan, Silva, Granato 2002, A&A, 392, 377 (radio emission); Panuzzo et al. 2003, A&A, 409, 99 (nebular emission); Silva et al. 2003, RMxAC, 17, 93 (X-ray emission- work in progress); Vega et al. 2005, MNRAS, 364, 1286 (PAH updated). Further several improvements we performed will be published (hopefully!) soon. 

GALSYNTH, a WEB interface to easily run GRASIL (NEW!). Have a look to an Introduction.

A very concise, but hopefully sufficient, manual for the smart user to use GRASIL, and a more complete description.

Details on our treatment of optical-UV extinction (discussed also in Laura's thesis).

A small library of models 

DOWNLOAD GRASIL (includes chemical evolution code CHE_EVO , SSP spectral library, and GRASIL code)

SSP (Single Stellar Populations) spectral library (single burst stellar populations as a function of age and metallicity if you are interested in only the “standard” no dust stellar spectral synthesis, see Bressan, A., Granato, G.L., Silva, L., 1998, A&A, 332, 135 and Bressan, A., Silva, L., Granato, G.L., 2002, A&A, 392, 377 for details on our SSP library including AGB enevelopes and radio emission) [dowload here the zip files of all the SSP of different IMFs]

Magnitudes and Colors: download the program to compute mags and colors (and their redshift evolution) for the SEDs you get with GRASIL or for SSPs

Pasquale Panuzzo’s HII regions libraries  described in Panuzzo, P., Bressan, A., Granato, G.L., Silva, L., Danese, L., 2003, A&A, 409, 99