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Abstract: The Hubble law, determined from the distance modulii and redshifts of galaxies, for the past 80 years, has been used as strong evidence for an expanding universe. This claim is reviewed in l...
Who discovered the expanding universe?
discover expanding universe Cosmology Extragalactic Astrophysics
2011/8/4
Abstract: Who discovered the expanding universe? Was it Hubble, or Lemaitre, or was it just the end result of a long series of investigations? In this article we summarise the main steps and contribut...
Fermi coordinates, simultaneity, and expanding space in Robertson-Walker cosmologies
Fermi coordinates simultaneity
2011/1/13
Explicit Fermi coordinates are given for geodesic observers comoving with the Hubble flow in expanding Robertson-Walker spacetimes, along with exact expressions for the metric tensors in Fermi coordin...
Population I Wolf-Rayet Runaway Stars: the Case of WR124 and its Expanding Nebula M1-67
gamma-ray burst general stars distances stars individual individual
2010/11/10
In 1997 and 2008 we used the WFPC2 camera on board of the Hubble Space Telescope to obtain two sets of narrow-band H images of the runaway Wolf-Rayet (WR) star WR 124 surrounded by its nebula M1–67. ...
The Morphology of the Expanding Ejecta of V2491 Cygni (2008 N.2)
line profiles – stars novae – stars individual V2491 Cyg
2010/11/12
Determining the evolution of the ejecta morphology of novae provides valuable information
on the shaping mechanisms in operation at early stages of the nova outburst. Understanding
such mechanisms h...
During their infancy, stars are well known to expel matter violently in the form of well-defined,collimated outflows. A fairly unique exception is found in the Orion BN/KL star-forming region where a ...
W49A: A starburst triggered by expanding shells
massive star formation starburst giant molecular cloud UC Hii region molecular bubble
2010/11/11
Aims. W49A is a giant molecular cloud which harbors some of the most luminous embedded clusters in the Galaxy. However, the explanation for this starburst-like phenomenon is still under debate.
Propagation of the burst of radiation in expanding and recombining Universe: Thomson scattering
radiation expanding recombining Universe
2011/1/10
Within the framework of a flat cosmological model a propagation of an instantaneous burst of nonpolarized isotropic radiation is considered from the moment of its beginning at some initial redshift z0...
The fragmentation of expanding shells III: Oligarchic accretion and the mass spectrum of fragments
Galaxy Astrophysics (astro-ph.GA)
2010/12/28
We use SPH simulations to investigate the gravitational fragmentation of expanding shells through the linear and non--linear regimes.
Evidence for Time Evolution in the Exciting Source of the Expanding Water Maser Bubble in Cepheus A
Time Evolution Expanding Water Maser Bubble Exciting Source Cepheus A
2009/6/15
Evidence for Time Evolution in the Exciting Source of the Expanding Water Maser Bubble in Cepheus A。