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H-ATLAS/GAMA: The nature and characteristics of optically red galaxies detected at submillimetre wavelengths

Dariush, A and Dib, S and Hony, S and Smith, DJB and Zhukovska, S and Dunne, L and Eales, S and Andrae, E and Baes, M and Baldry, IK and Bauer, A and Bland-Hawthorn, J and Brough, S and Bourne, N and Cava, A and Clements, D and Cluver, M and Cooray, A and Zotti, GD and Driver, S and Grootes, MW and Hopkins, AM and Hopwood, R and Kaviraj, S and Kelvin, L and Lara-Lopez, MA and Liske, J and Loveday, J and Maddox, S and Madore, B and Michalowski, MJ and Pearson, C and Popescu, C and Robotham, A and Rowlands, K and Seibert, M and Shabani, F and Smith, MWL and Taylor, EN and Tuffs, R and Valiante, E and Virdee, JS (2016) H-ATLAS/GAMA: The nature and characteristics of optically red galaxies detected at submillimetre wavelengths. Monthly Notices of the Royal Astronomical Society, 456 (2). pp. 2221-2259. ISSN 0035-8711

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Abstract

We combine Herschel/SPIRE sub-millimeter (submm) observations with existing multi-wavelength data to investigate the characteristics of low redshift, optically red galaxies detected in submm bands. We select a sample of galaxies in the redshift range 0.01$\leq$z$\leq$0.2, having >5$\sigma$ detections in the SPIRE 250 micron submm waveband. Sources are then divided into two sub-samples of $red$ and $blue$ galaxies, based on their UV-optical colours. Galaxies in the $red$ sample account for $\approx$4.2 per cent of the total number of sources with stellar masses M$_{*}\gtrsim$10$^{10}$ Solar-mass. Following visual classification of the $red$ galaxies, we find that $\gtrsim$30 per cent of them are early-type galaxies and $\gtrsim$40 per cent are spirals. The colour of the $red$-spiral galaxies could be the result of their highly inclined orientation and/or a strong contribution of the old stellar population. It is found that irrespective of their morphological types, $red$ and $blue$ sources occupy environments with more or less similar densities (i.e., the $\Sigma_5$ parameter). From the analysis of the spectral energy distributions (SEDs) of galaxies in our samples based on MAGPHYS, we find that galaxies in the $red$ sample (of any morphological type) have dust masses similar to those in the $blue$ sample (i.e. normal spiral/star-forming systems). However, in comparison to the $red$-spirals and in particular $blue$ systems, $red$-ellipticals have lower mean dust-to-stellar mass ratios. Besides galaxies in the $red$-elliptical sample have much lower mean star-formation/specific-star-formation rates in contrast to their counterparts in the $blue$ sample. Our results support a scenario where dust in early-type systems is likely to be of an external origin.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly notices of the Royal astronomical Society following peer review. The version of record "H-ATLAS/GAMA: The nature and characteristics of optically red galaxies detected at submillimetre wavelengths" is available online at: http://dx.doi.org/10.1093/mnras/stv2767
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 09 Dec 2015 11:48
Last Modified: 31 Mar 2016 08:45
DOI or Identification number: 10.1093/mnras/stv2767
URI: http://researchonline.ljmu.ac.uk/id/eprint/2447

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