Far infrared and Far ultraviolet emissions of galaxies: luminosity functions and selection effects. Implications for the future NGST and ALMA observations

V. Buat; D. Burgarella

Home/Archive/arXiv

arXiv · astro-ph/9909421

Far infrared and Far ultraviolet emissions of galaxies: luminosity functions and selection effects. Implications for the future NGST and ALMA observations

V. Buat·D. Burgarella

View original source ↗Read source document ↗Export metadata ↓

Abstract

The FIR(60 microns) and UV (0.2 microns) emissions of individual star forming galaxies are compared to the mean properties of the local Universe. Almost all the galaxies exhibit a FIR to UV flux ratio larger than the ratio of the FIR and UV luminosity densities. It is likely to be due to the contribution of low luminosity galaxies to the UV luminosity density: these galaxies are deficient in any survey. As the galaxies become brighter in FIR their FIR to UV flux ratio increases: (around 0.2 microns) it implies an increase of 0.5 mag of extinction (around 0.2 microns) per decade of FIR (60 microns) luminosity. This trend is extended and amplified in Ultra Luminous Infrared Galaxies observed at low and high redshift. The Lyman Break galaxies detected by their U dropout in the HDF seem to have less extreme properties more compatible with the trend found in the nearby star forming galaxies. The detection limits of the NGST and of the future large millimeter array (ALMA) in terms of FIR to UV ratios are presented.

Explore related subjects

astro-ph

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

V. Buat, D. Burgarella. 1999-09-24. Far infrared and Far ultraviolet emissions of galaxies: luminosity functions and selection effects. Implications for the future NGST and ALMA observations. https://arxiv.org/abs/astro-ph/9909421

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Cosmic Conundrums with Quantum Corrections

Darh energy was discovered over 25 years ago and we do not have an explanation of it. Dark matter comprises 95% of matter in the universe and we still don't know what it is. The Webb telescope has been finding fully formed galaxies with massive black holes millions of times the mass of the sun in the early universe and we don't have any explanation. A quantum density limitation will be used to solve these and other outstanding problems.

astro-ph↗

arXiv2026

On binary pulsars and the force of gravity

The energy-momentum budget of the astrophysical systems can be studied by the exact local conservation equation derived by Landau and Lifshitz. We show that a similar equation is valid for the Einstein-Cartan gravity. We reanalyze a binary pulsar system using the Landau-Lifshitz conservation equation and show that the orbital period change rate can be completely understood as a curvature backreaction process. Taking into account the detailed theoretical and observational research of relativistic binary pulsar systems, especially the system of Hulse and Taylor, we conclude that general relativity and astrophysical observations rule out the existence of gravitational radiation. We comment upon the LIGO GW events and their alternative explanation, as well as the recent pulsar timing arrays data.

astro-ph↗

arXiv2026

Oscillation frequencies and mode lifetimes in alpha Centauri A

We analyse our recently-published velocity measurements of alpha Cen A (Butler et al. 2004). After adjusting the weights on a night-by-night basis in order to optimize the window function to minimize sidelobes, we extract 42 oscillation frequencies with l=0 to 3 and measure the large and small frequency separations. We give fitted relations to these frequencies that can be compared with theoretical models and conclude that the observed scatter about these fits is due to the finite lifetimes of the oscillation modes. We estimate the mode lifetimes to be 1-2 d, substantially shorter than in the Sun.

astro-ph↗