Jet-Powered Flight

Integrated flight/thrust vectoring control for jet-powered unmanned aerial vehicles with ACHEON propulsion

Gamma-Ray Bursts and Jet-Powered Supernovae

The last five years have seen growing challenges to the traditional paradigm of a core collapse supernova powered by the neutrino emission of a young proto-neutron star. Chief among these challenges are gamma-ray bursts (GRBs) and the supernovae that seem to accompany them. Here we review some recent and not so recent models for GRBs and supernovae in which strong magnetic fields, rotation, or ...

An Ionized Jet Powered by Accretion

Analysis of high spatial resolution VLA images shows that the free-free emission from NGC7538 IRS 1 is dominated by a collimated ionized wind. We have re-analyzed high angular resolution VLA archive data from 6 cm to 7 mm, and measured separately the flux density from the compact bipolar core and the extended (1 . 5 3) lobes. We find that the flux density of the core is ∝ να, where ν is the fre...

Jet-powered Molecular Hydrogen Emission from Radio Galaxies

H2 pure-rotational emission lines are detected from warm (100–1500 K) molecular gas in 17/55 (31% of) radio galaxies at redshift z < 0.22 observed with the Spitzer IR Spectrograph. The summed H2 0–0 S(0)–S(3) line luminosities are L(H2) = 7 × 1038–2 × 1042 erg s−1, yielding warm H2 masses up to 2 × 1010 M . These radio galaxies, of both FR radio morphological types, help to firmly establish the...

Acoustic intensity near a high-powered military jet aircraft.

The spatial variation in vector acoustic intensity has been calculated between 100 and 3000 Hz near a high-performance military aircraft. With one engine of a tethered F-22A Raptor operating at military power, a tetrahedral intensity probe was moved to 27 locations in the geometric near and mid-fields to obtain the frequency-dependent intensity vector field. The angles of the maximum intensity ...