Physical properties from broadband SED fitting using CIGALE
Project information
Project leads: Katarzyna Małek (NCBJ), Junais (NCBJ)
Point of contact: Katarzyna Małek (Katarzyna.Malek@ncbj.gov.pl)
Rubin project code: POL-NCB-S3
Relevant working groups: SED-fitting and Photometric Redshifts, Low-surface-brightness Science
Project status: Active
Rationale
This project aims to generate a statistical framework of how the dust attenuation law depends on galaxies' physical properties and morphology and if the dust should be considered while analyzing the different types of galaxies, including Low surface brightness galaxies. We will achieve this goal by applying powerful statistical diagnoses to assess the dust attenuation priors based on the galaxy morphology and photometric and physical properties. Delivered priors will be used for the SED fitting tool as for example CIGALE, to fasten the process of estimation of the main physical properties, as well as to make it less complex - reducing significantly the grid of parameters used for the process. This step is crucial for such numerous samples as the LSST. Moreover, thanks to priors we can rely less on the other wavelength counterparts and we can exploit all possible detection from the LSST to deliver the main physical parameters.
This project will produce significant and crucial research deliverables necessary to fully exploit the massive astrophysical data gathered very soon from LSST. The PI’s long-term expertise in modeling the SED of galaxies will make this demanding project much easier to conclude.
Results
We have found that attenuation of the young stellar population is needed as a prior for a proper estimation of the SFR using LSST data only (Riccio et al., 2021). We perform a test based on normal star-forming galaxies, and we have found that without UV or IR data, the SFR based on the LSST bands only can be overestimated for low redshift galaxies. To overcome this problem we can use the attenuation as a prior using the relationship between attenuation for the young stellar population and the stellar mass.
Our work suggests, that we can estimate the dust attenuation in galaxies using only the LSST measurements (Małek, Junais et al., in prep). Moreover, we also study the variation of dust attenuation in galaxies as a function of their optical surface brightness and found that from the bright to faint end of the galaxy population, the dust attenuation significantly decreases, with only negligible dust contribution for the faintest galaxies (Junais, Małek et al. in prep.).
Talks and presentations
New optical priors in the service of understanding dust properties
K. Małek, J. Junais, A. Pollo
The Rubin-LSST Polish Consortium Annual Meeting 2023
Warsaw, Poland, 2023-10-24 - 2023-10-26
Dust attenuation in low surface brightness galaxies and its implication for large sky surveys
Junais, K. Małek, A. Pollo
The Rubin-LSST Polish Consortium Annual Meeting 2023
Warsaw, Poland, 2023-10-24 - 2023-10-26
Estimation of galaxy physical properties using SED fitting techniques in the LSST era
J. Junais,
Rubin Observatory LSST@Europe5, Porec, Croatia, September 2025-29.2023
New observational priors in the service of understanding dust properties
K. Małek, J. Junais, A. Pollo, M. Hamed, G. Riccio
Rubin Observatory LSST@Europe5, Porec, Croatia, September 2025-29.2023
K. Małek, J. Junais, M. Hamed, G. Riccio
Rubin Observatory LSST@Europe4, Shaping the European Contribution to LSST, Rome, Italy | October 24-28 2022
J. Junais, K. Małek
Rubin Observatory LSST@Europe4, Shaping the European Contribution to LSST, Rome, Italy | October 24-28 2022
G. Riccio, K. Małek
Rubin Observatory LSST@Europe4, Shaping the European Contribution to LSST, Rome, Italy | October 24-28 2022
G. Riccio, K. Małek
40th Polish Astronomical Society Meeting: 13 -17 September 2021, Szczecin, Poland
Waiting for LSST data: estimation of main physical properties of z<2.5 main sequence galaxies
G. Riccio, K. Małek
IAUGA 2022, August 2-11, 2022 | BEXCO, Busan, Republic of Korea
How reliable are galaxies' physical parameters estimations for LSST main sequence sample?
G. Riccio
The Rise of Metals and Dust in Galaxies through Cosmic Time, Marseille, France, 2020-10-26 - 2020-10-30
Outputs
Our project will deliver useful tools and methodology to homogeneously estimate the basic physical properties (e.g., stellar mass, star formation rate, attenuation) of the large number of galaxies that will be observed by LSST.
List of papers:
Małek, K. , Junais , Pollo, A. , Boquien, M. , Buat, V. , Salim, S. , Brough, S. , Demarco, R. , Graham, A. W. , Hamed, M. , Mullaney, J. R. , Romano, M. , Sifón, C. , Aravena, M. , Benavides, J. A. , Busà, I. , Donevski, D. , Dorey, O. , Hernandez-Toledo, H. M. , Nanni, A. , Pearson, W. J. , Pistis, F. , Ragusa, R. , Riccio, G. , Román, J., "Attenuation proxy hidden in surface brightness-colour diagrams. A new strategy for the LSST era." in press, Astronomy & Astrophysics (2024)
Junais; Małek, K. et al., "Variation in optical and infrared properties of galaxies in relation to their surface brightness", Astronomy & Astrophysics, 676, A41 (2023)
Riccio, Gabriele, Małek, Katarzyna, Nanni, Ambra, Boquien, Médéric, Buat, Véronique, Burgarella, Denis, Donevski, Darko, Hamed, Mahmoud, Hurley, Peter, Shirley, Raphael, and Pollo, Agnieszka, "Preparing for LSST Data: in Search of Main Physical Properties of the Main Sequence Galaxies", XL Polish Astronomical Society Meeting (2022)
Riccio, G., Małek, K., Nanni, A., Boquien, M., Buat, V., Burgarella, D., Donevski, D., Hamed, M., Hurley, P., Shirley, R., and Pollo, A., "Preparing for LSST data. Estimating the physical properties of z < 2.5 main-sequence galaxies", Astronomy and Astrophysics (2021)
Connections to other projects
Cross-matching Rubin and VISTA surveys, Sky subtraction that preserves low-surface-brightness flux