Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Spectroscopic limits to an extragalactic far-ultraviolet background.

C Martin1, M Hurwitz, S Bowyer

  • 1Physics Department, Columbia University, New York 10027, USA.

The Astrophysical Journal
|October 1, 1991
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Growth and morphogenesis in Streptomyces.

FEMS microbiology letters·1992
Same author

Malignant lymphoma in a patient with relapsing bronchiolitis obliterans organizing pneumonia.

Chest·1992
Same author

Pharmacokinetics and tissue penetration of a single dose of ceftriaxone (1,000 milligrams intravenously) for antibiotic prophylaxis in thoracic surgery.

Antimicrobial agents and chemotherapy·1992
Same author

Nucleotide sequence of the nfaA gene encoding the antigen 8786 adhesive factor of enterotoxigenic Escherichia coli.

FEMS microbiology letters·1992
Same author

Plant genetics flourishes.

Trends in genetics : TIG·1992
Same author

Relatedness of penicillin-binding protein 1a genes from different clones of penicillin-resistant Streptococcus pneumoniae isolated in South Africa and Spain.

The EMBO journal·1992

This study measured the lowest intensity diffuse far-ultraviolet background, finding dust reflection likely explains most of the continuum. This refines our understanding of the extragalactic FUV background and neutrino properties.

Area of Science:

  • Astronomy and Astrophysics
  • Cosmic Microwave Background Radiation
  • Interstellar Medium

Background:

  • The extragalactic far-ultraviolet (FUV) background is crucial for understanding galaxy evolution and cosmology.
  • Previous studies identified various components contributing to the FUV background, including scattered Galactic light, emission lines, and integrated galaxy light.

Purpose of the Study:

  • To constrain the properties of the extragalactic FUV background using a spectrum of the lowest intensity diffuse FUV light.
  • To investigate the contributions of different components, particularly dust scattering, to the observed FUV background.
  • To set improved limits on the radiative lifetimes of massive neutrinos.

Main Methods:

  • Acquired a spectrum of the lowest intensity diffuse FUV background across multiple celestial view directions.
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-60NASA Program ExobiologyNon-NASA Center

Related Experiment Videos

  • Analyzed the spectrum to determine the mean continuum level and identify spectral features.
  • Compared observational data with galaxy evolution models and theoretical predictions for various FUV background components.

    • Main Results:

    • Established a firm upper limit for the extragalactic FUV background in the 1400-1900 angstroms band at 280 +/- 35 photons cm⁻² s⁻¹ Å⁻¹ sr⁻¹.
    • Found no evidence for additional extragalactic components beyond known sources.
    • Determined that dust reflection likely accounts for the majority of the continuum in low H I column density directions, suggesting an unidentified dust component or enhanced scattering efficiency.

    Conclusions:

    • The observed FUV background in low H I column density regions is primarily explained by dust reflection, with minor contributions from H II two-photon emission and late-type galaxies.
    • The findings challenge models dominated by unclustered, starburst galaxies at low redshifts.
    • Improved limits on massive neutrino radiative lifetimes were derived, and significant contributions from intergalactic medium radiation were deemed unlikely.