Normal Gas-Rich Galaxies in the Far-Infrared: The Legacy of ISOPHOT

Tuffs, R.; Popescu, Cristina

doi:10.1063/1.1913949

AIP Conference Proceedings

2005

DOI: 10.1063/1.1913949

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Normal Gas-Rich Galaxies in the Far-Infrared: The Legacy of ISOPHOT

R. Tuffs

Cristina Popescu

Abstract: Following on from IRAS, the ISOPHOT instrument on board the Infrared Space Observatory (ISO) has provided a huge advancement in our knowledge of the phenomenology of the far-infrared (FIR) emission of normal galaxies and the underlying physical processes. Highlights include: the discovery of an extended cold dust emission component, present in all types of gas-rich galaxies and carrying the bulk of the dust luminosity; the definitive characterisation of the spectral energy distribution in the FIR, revealing th… Show more

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Cited by 4 publications

References 58 publications

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Modelling the SEDs of spiral galaxies

Popescu

Tuffs

2008

EAS Publications Series

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Abstract. Modelling the UV/optical -infrared/submm SEDs of spiral galaxies observed with Herschel will be an essential tool to quantitatively interpret these observations in terms of the present and past star-formation activity of these systems. In this lecture we describe the SED modelling technique we have developed, its applications and tests of its predictions. We show that both the panchromatic SED modelling of individual galaxies and the B-band attenuation-inclination relation of large statistical samples suggest that spiral galaxies in the nearby Universe behave as optically thick systems in their global properties and large-scale distribution of light (central face-on B-band opacity of τ f B ∼ 4). However disk galaxies are very inhomogeneous systems, having both optically thick components (e.g. spiral arms), and optically thin components (e.g. the interarm regions), the latter making galaxies transparent to background galaxies.

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Modelling the SEDs of spiral galaxies

Popescu

Tuffs

2008

EAS Publications Series

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SPITZEROBSERVATIONS OF COLD DUST GALAXIES

Willmer

Rieke

Floc’h

et al. 2009

The Astronomical Journal

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CHARACTERIZATION OF OPTICALLY SELECTED STAR-FORMING KNOTS IN (U)LIRGs

Miralles-Caballero¹,

Colina²,

Arribas³

et al. 2011

The Astronomical Journal

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We present a comprehensive characterization of the general properties (luminosity functions (LFs), mass, size, ages, etc.) of optically selected compact stellar objects (knots) in a representative sample of 32 low-z luminous and ultraluminous infrared galaxies ((U)LIRGs). It is important to understand the formation and evolution of these properties in such systems, which represent the most extreme cases of starbursts in the low-z universe. We have made use of high angular resolution Advanced Camera for Surveys images from the Hubble Space Telescope in F435W (∼B) and F814W (∼I) bands. The galaxies in the sample represent different interaction phases (first contact, pre-merger, merger, and post-merger) and cover a wide luminosity range (11.46 log (L IR /L ) 12.54). With a median size of 32 pc, most of the nearly 3000 knots detected consist of complexes of star clusters. Some of the knots (∼15%) are so blue that their colors indicate a young (i.e., <30 Myr) and almost extinction-free population. There is a clear correlation of the mass of these blue knots with their radius, where M ∝ R 1.91±0.14 , similar to that found in complexes of clusters in M51 and in giant molecular clouds. This suggests that the star formation within the knots is proportional to the gas density at any given radius. This relation does not depend significantly on either the infrared luminosity of the system or the interaction phase. The star formation of all the knots is characterized by LFs of the knots with slopes close to 2. Nevertheless, we see a marginally significant indication that the LF evolves with the interaction process, becoming steeper from early to advanced merger phases. Due to size-of-sample effects we are probably sampling knots in ULIRGs that intrinsically more luminous (by a factor of about four) than in less luminous systems. They also have sizes and are likely to have masses characteristic of clumps in galaxies at z 1. Knots in post-mergers are on average (1.3-2 times) larger, more luminous (2 mag) in the I band, and 0.5 mag redder than those in systems in earlier phases. Two scenarios are briefly discussed: (1) the likely presence of relatively high extinction in the most advanced mergers and (2) the dissolution of the less massive clusters and/or their coalescence into more massive, evolved superclusters.

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Normal Gas-Rich Galaxies in the Far-Infrared: The Legacy of ISOPHOT

Cited by 4 publications

References 58 publications

Modelling the SEDs of spiral galaxies

Modelling the SEDs of spiral galaxies

SPITZEROBSERVATIONS OF COLD DUST GALAXIES

CHARACTERIZATION OF OPTICALLY SELECTED STAR-FORMING KNOTS IN (U)LIRGs

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