H-ATLAS/GAMA : The nature and characteristics of optically red galaxies detected at submillimetre wavelengths
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 |
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Uncontrolled Keywords | astro-ph.GA |
Date Deposited | 26 Jul 2024 23:39 |
Last Modified | 26 Jul 2024 23:39 |
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- Dariush, A.
- Dib, S.
- Hony, S.
- Smith, D. J. B.
- Zhukovska, S.
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- Andrae, E.
- Baes, M.
- Baldry, I.
- Bauer, A.
- Bland-Hawthorn, J.
- Brough, S.
- Bourne, N.
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- Clements, D.
- Cluver, M.
- Cooray, A.
- Zotti, G. De
- Driver, S.
- Grootes, M. W.
- Hopkins, A. M.
- Hopwood, R.
- Kaviraj, S.
- Kelvin, L.
- Lara-Lopez, M. A.
- Liske, J.
- Loveday, J.
- Maddox, S.
- Madore, B.
- Michalowski, M. J.
- Pearson, C.
- Popescu, C.
- Robotham, A.
- Rowlands, K.
- Seibert, M.
- Shabani, F.
- Smith, M. W. L.
- Taylor, E. N.
- Tuffs, R.
- Valiante, E.
- Virdee, J. S.
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