Molecular hydrogen beyond the optical edge of an isolated spiral galaxy
Article Abstract:
A study is conducted to report the detection of emission from carbon monoxide (CO), the most abundant tracer of molecular hydrogen (H2), beyond the optical radius of the nearby galaxy NGC 4414. It is concluded that although molecular clouds can form in the outer region of this galaxy, there is little mass associated with them.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
User Contributions:
Comment about this article or add new information about this topic:
An asymptotic-giant-branch star in the progenitor system of a type la supernova
Article Abstract:
The presence of strong hydrogen emission associated with the type Ia supernova SN2002ic, indicating the presence of large amounts of circumstellar material, is described. The progenitor system contained a massive asymptotic-giant-branch star that lost several solar masses of hydrogen-rich gas before the supernova explosion.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
Universal alignment of hydrogen levels in semiconductors, insulators and solutions
Article Abstract:
Hydrogen, which affects the electronic and structural properties of many materials in a wide range of hosts is theoretically studied. The study reveals the effect of an existence of universal alignment, for the electronic transition level of hydrogen in semiconductors, insulators and even aqueous solutions.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Ecological heterogeneity in the effects of grazing and fire on grassland diversity. Estimating diversity in unsampled habitats of a biogeographical province
- Abstracts: an ancient role for nuclear beta-catenin in the evolution of axial polarity and germ layer segregation. Cephalopod Hox genes and the origin of morphological novelties
- Abstracts: Physiology and molecular phylogeny of coexisting Prochlorococcus ecotypes. Cyanophages infecting the oceanic cyanobacterium Prochlorococcus
- Abstracts: Enzymes play molecular tag. Friction and torque govern the relaxation of DNA supercoils by eukaryotic topoisomerase IB
- Abstracts: Molecular structure in an instant. Seeing the light. Negative refraction by photonic crystals