Hot gas and dark matter in a compact galaxy group
Article Abstract:
HCG62 is a compact group of galaxy, a group that warrants special interest due to predicted coalescence with nearby compact groups in a few billion years. Through the Rosat X-ray telescope, a cloud of hot gas was detected on HCG62 that was essential in revealing the description of the dark matter and the evolution of the group. The compact core of HCG62 evolved as a consequence of orbital decay in extended systems. In comparison with another group, NGC2300, both were found to have similar mean temperature, low metallicity, dominated by dark matter and have baryon fraction increase with radius.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Extensive dark-matter haloes in low-luminosity galaxies revealed by quasar absorption lines
Article Abstract:
Observations of two low-luminosity spiral galaxies reveal that both the galaxies have haloes of dark matter with large radii. Determination of the extent of dark matter which is a major part of spiral galaxies, was difficult until the suggestion that Lyman-alpha absorption lines observed in the spectra of distant quasars result from the gaseous haloes of intervening galaxies. The redshifts of the two galaxies are coincident with those of the Lyman-alpha lines in the spectra of quasars that are near the galaxies in the sky.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Explosive ejection of matter associated with star formation in the Orion nebula
Article Abstract:
An observation of Orion nebula, a star forming region, implies that stellar winds from young stars interact with the interstellar medium that produces shockwaves known as Herbig-Haro (HH) objects. There are two speculations on how the creation of HH objects, first is spewed out material interacts with the molecular cloud and the second is that stationary knots encounter low density jets. Recent observational results reveal the former as a more plausible cause of HH objects.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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