ar X iv : a st ro - p h / 04 06 42 7 v 1 18 J un 2 00 4 The far - infrared spectrum of Arp 220 1
نویسندگان
چکیده
ISO/LWS grating observations of the ultraluminous infrared galaxy Arp 220 shows absorption in molecular lines of OH, H2O, CH, NH, and NH3, as well as in the [O I] 63 μm line and emission in the [C II] 158 μm line. We have modeled the continuum and the emission/absorption of all observed features by means of a non-local radiative transfer code. The continuum from 25 to 1300 μm is modeled as a warm (106 K) nuclear region that is optically thick in the Visiting Astronomer, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138. CSIC, IEM, Dpto. Astrof́ısica Molecular e Infrarroja, Serrano 123, E-28006 Madrid, Spain.
منابع مشابه
ar X iv : a st ro - p h / 04 06 42 9 v 1 18 J un 2 00 4 On the Stability of Test Particles in Extrasolar Multiple Planet Systems
We present results of extensive numerical studies of the stability of non-interacting particles in the planetary systems of stars υ Andromedae, GJ 876, 47 UMa, and 55 Can-cri. We discuss the possibility of the existence of islands of stability and/or instability at different regions in these multi-body systems, and their probable correspondence to certain mean-motion resonances. The results of ...
متن کاملar X iv : a st ro - p h / 06 06 12 4 v 1 6 J un 2 00 6 Inhomogeneous Cosmology , Inflation and Late - Time Accelerating Universe
An inhomogeneous cosmology describing a spacetime without symmetry is shown to be able to inflate the early universe and explain the late-time acceleration of the universe without a cosmological constant and negative pressure dark energy and avoid the coincidence problem. e-mail: [email protected]
متن کاملar X iv : a st ro - p h / 04 06 25 2 v 1 9 J un 2 00 4 Q 0906 + 6930 : The Highest - Redshift Blazar
We report the discovery of a radio-loud flat-spectrum QSO at z=5.47 with properties similar to those of the EGRET γ-ray blazars. This source is the brightest radio QSO at z>5, with a pc-scale radio jet and a black hole mass estimate & 10M⊙. It appears to be the most distant blazar discovered to date. High energy observations of this source can provide powerful probes of the background radiation...
متن کاملar X iv : a st ro - p h / 97 05 10 3 v 1 1 4 M ay 1 99 7 OSSE OBSERVATIONS OF THE ULTRALUMINOUS INFRARED GALAXIES ARP 220 , MRK 273 , AND MRK 231
We report results of soft gamma-ray observations of the ultraluminous infrared galaxies Arp 220, Mrk 273, and Mrk 231 in order to test whether the infrared radiation from these sources originates from buried active galactic nuclei (AGNs). Only upper limits are measured, implying that the emergent soft gamma-ray luminosities are 1-2 orders of magnitude smaller than the infrared luminosities. Mon...
متن کامل