Título

Blast observations of resolved galaxies: temperature profiles and the effect of active galactic nuclei on fir to submillimeter emission

Autor

David Hughes

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/licenses/by-nc-nd/4.0

Materias

Balloons - (INSPEC) Galaxies: photometry - (INSPEC) Submillimeter - (INSPEC) Telescopes - (INSPEC) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI)

Resumen o descripción

Over the course of two flights, the Balloon-borne Large Aperture Submillimeter Telescope (BLAST) made resolved maps of seven nearby (<25 Mpc) galaxies at 250, 350, and 500 μm. During its 2005 June flight from Sweden, BLAST observed a single nearby galaxy, NGC 4565. During the 2006 December flight from Antarctica, BLAST observed the nearby galaxies NGC 1097, NGC 1291, NGC 1365, NGC 1512, NGC 1566, and NGC 1808. We fit physical dust models to a combination of BLAST observations and other available data for the galaxies observed by Spitzer. We fit a modified blackbody to the remaining galaxies to obtain total dust mass and mean dust temperature. For the four galaxies with Spitzer data, we also produce maps and radial profiles of dust column density and temperature. We measure the fraction of BLAST detected flux originating from the central cores of these galaxies and use this to calculate a “core fraction,” an upper limit on the “active galactic nucleus fraction” of these galaxies. We also find our resolved observations of these galaxies give a dust mass estímate 5–19 times larger than an unresolved observation would predict. Finally, we are able to use these data to derive a value for the dust mass absorption coefficient of κ = 0.29 ±0.03 m² kg⁻¹ at 250 μm. This study is an introduction to future higher-resolution and higher-sensitivity studies to be conducted by Herschel and SCUBA-2.

Editor

The Astrophysical Journal

Fecha de publicación

2009

Tipo de publicación

Artículo

Versión de la publicación

Versión aceptada

Recurso de información

http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1359

Formato

application/pdf

Idioma

Inglés

Audiencia

Estudiantes

Investigadores

Público en general

Sugerencia de citación

Wiebe, Donald V., et al., (2009). Blast observations of resolved galaxies: temperature profiles and the effect of active galactic nuclei on fir to submillimeter emission, The Astrophysical Journal. Vol. 707(2):1809–1823

Repositorio Orígen

Repositorio Institucional del INAOE

Descargas

310