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The x-ray luminosities of Herbig-Haro objects
The recent detection of X-ray emission from HH 2 and HH 154 with the Chandra and XMM-Newton satellites (respectively) have opened up an interesting, new observational possibility in the field ofExpand
Reanalysis of the Viking results suggests perchlorate and organics at midlatitudes on Mars
[1] The most comprehensive search for organics in the Martian soil was performed by the Viking Landers. Martian soil was subjected to a thermal volatilization process to vaporize and break organicExpand
The Hot, Diffuse Gas in a Dense Cluster of Massive Stars
We present an analytic model describing the cluster wind flow that results from the multiple interaction of the stellar winds produced by the stars of a dense cluster of massive stars. The analyticExpand
Minihalo photoevaporation during cosmic reionization : evaporation times and photon consumption rates
ABSTRACT The weak, R-type ionization fronts (I-fronts) which swept across the intergalacticmedium (IGM) during the reionization of the universe often found their paths blockedby cosmologicalExpand
Structure, Excitation, and Kinematics of the Luminous Herbig-Haro Objects 80/81
We present a detailed study of the Herbig-Haro objects HH 80/81, twin working surfaces in the highly collimated outflow driven by a luminous young star. High angular resolution emission line imagesExpand
Photoevaporation of cosmological minihaloes during reionization
Energy released by a small fraction of the baryons in the Universe, which condensed out while the intergalactic medium (IGM) was cold, dark and neutral, reheated and reionized it by redshift 6,Expand
Proper Motions of the Jets in the Region of HH 30 and HL/XZ Tau. Evidence for a Binary Exciting Source of the HH 30 Jet
We present [S II] images of the HH 30 and HL/XZ Tau region obtained at two epochs, as well as long-slit optical spectroscopy of the HH 30 jet. We measured proper motions of ~100-300 km s-1 for the HHExpand
Hubble Space Telescope Observations of Jets from Young Stars
We report on Hubble Space Telescope (HST) emission line ([S II]λλ6716,6731, Hα, and [O I]λ6300) and nearby continuum imaging of the HL Tau and HH 30 jets from our own HST program as well as a studyExpand
Line ratios from shocked cloudlets in planetary nebulae
Context. Some PNe and PPNe show compact knots, travelling at high velocities away from the central sources. Aims. We compute a number of models from which we obtain predictions of the emission-lineExpand