3D Continuum radiative transfer in complex dust configurations around young stellar objects and active nuclei II. 3D Structure of the dense molecular cloud core ρ Oph D Abstract. Constraints on the density and thermal 3D structure of the dense molecular cloud core ρ Oph D are derived from a detailed 3D radiative transfer modeling. Two ISOCAM images at 7 and 15 µm are fitted simultaneously by re...

We report observations of three SDSS z > 6 QSOs at 250 GHz (1.2 mm) using the 117-channel MaxPlanck Millimeter Bolometer (MAMBO-2) array at the IRAM 30-meter telescope. J1148+5251 (z = 6.41) and J1048+4637 (z = 6.23) were detected with 250 GHz flux densities of 5.0±0.6mJy and 3.0±0.4 mJy, respectively. J1630+4012 (z = 6.05) was not detected with a 3σ upper limit of 1.8 mJy. Upper flux density l...

Motivated by recent observations which detect dust at large galactocentric distances in the disks of spiral galaxies, we propose a mechanism of outward radial transport of dust by spiral stellar density waves. We consider spiral galaxies in which most of dust formation is localized inside the corotation radius. We show that in the disks of such spiral galaxies, the dust grains can travel over r...

We investigate the possibility to search for metal-poor high column density (> ∼ 10 cm) clouds at high redshift (z) by using gamma ray burst (GRB) afterglows. Such clouds could be related to primeval galaxies which may cause a burst of star formation. We show that a large part of hydrogen is in molecular form in such a high column density environment. Therefore, hydrogen molecules (H2) rather t...

Recent observations suggest appreciable star formation activity in early-type galaxies down to redshift z ∼ 0.5. If so, there is likely to be dust in these galaxies. We consider the possibility that obscuration by dust can reconcile the observed frequency of gravitational lensing of quasar images with the considerably larger rate predicted in a low density cosmologically flat universe dominated...

The low density van Stockum dust solution is extended by including an angular deficit factor. The resulting model describes a rotating Gott–Hiscock string surrounded by an annular dust atmosphere. The interior spacetime can be joined to a vacuum Levi-Civita solution with angular deficit. PACS numbers: 04.20.Jb, 04.40.−b, 98.80.Hw

We constructed a local luminosity function (LF) of galaxies using a flux-limited sample (S170 ≥ 0.195 Jy) of 55 galaxies at z < 0.3 taken from the ISO FIRBACK survey at 170 μm. The overall shape of the 170-μm LF is found to be different from that of the total 60-μm LF (Takeuchi, Yoshikawa, & Ishii 2003): the bright end of the LF declines more steeply than that of the 60-μm LF. This behavior is ...

We investigate the destruction of dust grains by sputtering in the high-velocity interstellar shocks driven by supernovae (SNe) in the early universe to reveal the dependence of the time-scale of dust destruction on the gas density nH,0 in the interstellar medium (ISM) as well as on the progenitor mass Mpr and explosion energy E51 of SN. The sputtering yields for the combinations of dust and io...