Colloq Abstract - Jack Singal

May 06, 2022

11:00am Mountain

Jack Singal (University of Richmond)

 

How Bright is the Radio Sky? We Don't Know … Yet

 

Abstract

In astrophysics and cosmology many investigations depend on understanding the radio sky. These include studies of the cosmic microwave background and 21 cm cosmology, which must account for radio foregrounds which can be significantly brighter than the signals of interest. However the actual level of diffuse radio emission on our sky is surprisingly uncertain, and in fact all estimates ultimately trace back to just one measurement - the 408 MHz Haslam map from the 1980s, which itself derives its absolute calibration from highly uncertain measurements from the 1960s and earlier. This talk will discuss the present state of uncertainty, including the prospect of a bright, mysterious background of radio emission in the universe. Then we will discuss the current project to resolve these questions and make the first ever reliably absolutely calibrated large-scale radio map, using the unique features of the Green Bank Telescope combined with custom instrumentation.

 

 

 

Connect with NRAO

The National Radio Astronomy Observatory and Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.

The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."

AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.