Dariush, A, Dib, S, Hony, S, Smith, DJB, Zhukovska, S, Dunne, L, Eales, S, Andrae, E, Baes, M, Baldry, IK, Bauer, A, Bland-Hawthorn, J, Brough, S, Bourne, N, Cava, A, Clements, D, Cluver, M, Cooray, A, Zotti, GD, Driver, S et al, Grootes, MW, Hopkins, AM, Hopwood, R, Kaviraj, S, Kelvin, L, Lara-Lopez, MA, Liske, J, Loveday, J, Maddox, S, Madore, B, Michalowski, MJ, Pearson, C, Popescu, C, Robotham, A, Rowlands, K, Seibert, M, Shabani, F, Smith, MWL, Taylor, EN, Tuffs, R, 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

Preview

Text 1511.08018v1.pdf - Accepted Version Download (1MB) | Preview

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:	http://arxiv.org/abs/1511.08018v1
Date Deposited:	09 Dec 2015 11:48
Last Modified:	03 Aug 2022 07:45
DOI or ID number:	10.1093/mnras/stv2767
URI:	https://researchonline.ljmu.ac.uk/id/eprint/2447

View Item