ABSTRACT Infrared emission features at 3.3, 6.2, 7.7, 8.6, and 11.2 µm, attributed to polycyclic aromatic hydrocarbons (PAHs), show variations in relative intensity, shape, peak position. These depend on the physical conditions of photodissociation region (PDR) which strong PAH arises but their relationship has yet be fully quantified. We aim better calibrate response species environment using ...

We report on a sensitive infrared search for disks around isolated young planetary-mass objects (PMOs) in the NGC1333 cluster, by stacking 70 Spitzer/IRAC frames at 3.6 and 4.5$\,\mu m$. Our co-added images go >2.3 mag deeper than single-epoch frames, cover 50 brown dwarfs, 15 of which have M9 or later spectral types. Spectral types >M9 correspond to masses giant planet domain, i.e., near below...

We report the discovery of a dozen Herbig-Haro jets illuminated by the Lyman continuum (λ < 912Å) and/or softer far-ultraviolet (912Å < λ < 2000Å) radiation fields of nearby high mass stars. Five irradiated outflows lie in the outer parts of the Orion Nebula (HH 502 through HH 506) and seven lie near the reflection nebula NGC 1333 in the Perseus molecular cloud (HH 333 through HH 336, and HH 49...

career days; and science projects undertaken with Scout troops. Churches that received grants from the competition varied in denomination, geographical region, and the size of the communityserved. Among the cities represented are Baltimore, Chicago, Detroit, Houston, New Orleans, New York, Philadelphia, and Washington, D.C. Churches in smaller towns in several states also received grants; eight...