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However, whether this is true in IR-luminous, star forming galaxies in general, remains to be seen, and underlines the need for high-J, high-dipole observations of large samples of low- to moderate-z ULIRGs -- a task which we show the HI-FI instrument on board Herschel is ideally suited to do.Title: The Structure and Dynamics of GRB Jets Authors: Jonathan Granot (KIPAC, Stanford) Comments: 27 pages, 26 figures; invited review for the proceedings of the conference "Triggering Relativistic Jets", held in Cozumel, Mexico, on March 28 to April 1, 2005; accepted for publication in Rev. A&A There are several lines of evidence which suggest that the relativistic outflows in gamma-ray bursts (GRBs) are collimated into narrow jets.These nuclear stellar disks may provide a preferred kinematic axis to externally-accreted material and this material may in turn form new stars in these disks.The observed incidence of nuclear stellar disks and circumnuclear dust suggests that episodic replenishment of nuclear stellar disks occurs and is approximately concurrent with the fueling of the central AGN.
Our analysis also reveals that approximately a third of the early-type galaxies without circumnuclear dust have nuclear stellar disks. This threshold is predicted by the lower limit on the spectral slope $\Gamma_ \approx 0.5$ observed for rotation-powered pulsars (Gotthelf 2003). Using this new molecular line inventory in conjunction with existing data in the literature, we have compiled the most extensive molecular line data sets to date of such galaxies. Below $\dot E_c$, the 2-10 ke V PWN flux ratio $F_/F_$ decreases by an order-of-magnitude. Radford (3) ((1) California Institute of Technology, Pasadena, USA; (2) Institut für Astronomie, ETH, Zürich, Switzerland; (3) Purple Mountain Observatory, Nanjing, China) Comments: 20 pages (emulated Ap J style), 5 figures, submitted to Ap J We report single-dish observations of 12CO, 13CO, C18O, HCN, HNC, HNCO, CS, and HCO molecular line emission in the two ultraluminous infra-red galaxies Arp220 and NGC6240.The jet structure has important implications for the true energy release and the event rate of GRBs, and can constrain the mechanism responsible for the acceleration and collimation of the jet.
Nevertheless, the jet structure and its dynamics as it sweeps up the external medium and decelerates, are not well understood.
Myers (1) ((1) Harvard-Smithsonian Center for Astrophysics, (2) Herzberg Institute of Astrophysics, (3) University of Victoria) Comments: Accepted for publication in Ap J (36 pages, 13 figures) We present a census of the population of deeply embedded young stellar objects (YSOs) in the Perseus molecular cloud complex based on a combination of Spitzer Space Telescope mid-IR data from the c2d legacy team and JCMT/SCUBA submillimeter maps from the COMPLETE team.