The UV enigma of post-starburst galaxies

• Published in: Astrophysics and space science 2014-11, Vol.354 (1), p.65-68
• Main Authors: Melnick, Jorge, De Propris, Roberto
• Format: Article
• Language: English
• Subjects: Astrobiology; Astronomy; Astrophysics; Astrophysics and Astroparticles; Cosmology; Dust; Errors; Galaxies; Modelling; Observations and Techniques; Optical properties; Original Article; Photometry; Physics; Physics and Astronomy; Populations; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Starbursts; Stars & galaxies; Ultraviolet astronomy; Variance
• ISSN: 0004-640X; 1572-946X
• DOI: 10.1007/s10509-014-1948-1

We have studied the panchromatic broad-band properties from the FUV to the MIR of a sample of 808 post-starburst galaxies. We find that in the optical and near-IR bands post-starburst galaxies (PSGs) form a remarkably uniform class of objects and that, on average, simple populations synthesis models (SSP) reproduce very well the SEDs of PSGs over a broad wavelength range, but not in the UV. We also find that, while the photometric variance in the optical and near-IR properties of the sample is small and comparable to the observational errors, both in the UV and the mid-IR the observed variance is much larger than the errors. We find a strong correlation between the UV fluxes and those in the mid-IR, indicating that the large variance in UV properties of PSGs could be related to a non-uniform distribution of dust covering the intermediate age populations. The disagreement between models and observations in the UV could be due to inadequate modelling; to the contribution of AGB and post-AGB stars; or to a non-uniform distribution of dust; possibly all three. Further progress in understanding this important class of galaxies, therefore, requires at the same time better modelling and better observations in the UV and mid-IR.