Dust in Hot Environments: Giant Dusty Galactic Halos

On the lack of cold dust in IRAS P09104+4109 and IRAS F15307+3252 – their spectral energy distributions and implications for finding dusty AGNs at high redshift

We present upper limits on the 850 μm and 450 μm fluxes of the warm hyperluminous (bolometric luminosity Lbol > 10 13 L⊙) galaxies IRAS P09104+4109 (z = 0.442) and IRAS F15307+3252 (z = 0.926), derived from measurements using the SCUBA bolometer array on the James Clerk Maxwell Telescope. Hot luminous infrared sources like these are thought to differ from more normal cold ultraluminous infrared...

WIRE Ancillary Science - Are Galactic Halos Dusty ?

Investigation of Dust-Ion Acoustic Waves in a Magnetized Collisional Dusty Plasma with Kappa Distribution Function for Electrons

The propagation of arbitrary amplitude dust ion acoustic waves (DIAWs) in a magnetized collisional dusty plasma including hot electrons, with kappa velocity distribution for electrons, warm ions and dust particles has been studied. In the presence of immobile massive dust particulates, DIAWs have been investigated through the Sagdeev pseudo-potential method. It is demonstrated that the amplitud...

The 60-μm extragalactic background radiation intensity, dust-enshrouded active galactic nuclei and the assembly of groups and clusters of galaxies

Submillimetre (submm)-wave observations have revealed a cosmologically significant population of high-redshift dust-enshrouded galaxies. The form of evolution inferred for this population can be reconciled easily with COBE FIRAS and DIRBE measurements of the cosmic background radiation (CBR) intensity at wavelengths longer than about 100μm. At shorter wavelengths, however, the 60-μm CBR intensi...

The temperatures of dust-enshrouded active galactic nuclei

A high density of massive dark objects (MDOs), probably supermassive black holes, in the centres of nearby galaxies has been inferred from recent observations. There are various indications that much of the accretion responsible for producing these objects took place in dust-enshrouded active galactic nuclei (AGNs). If so, then measurements of the intensity of background radiation and the sourc...