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

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Abstract
We combine Herschel/SPIRE submillimetre (submm) observations with existing multiwavelength 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 <= z <= 0.2, having > 5s detections in the SPIRE 250 mu m 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 approximate to 4.2 per cent of the total number of sources with stellar masses M* >= 1010 M-circle dot. Following visual classification of the red galaxies, we find that greater than or similar to 30 per cent of them are early-type galaxies and greater than or similar to 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 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.
Keywords
STAR-FORMATION, galaxies: general, ELLIPTIC GALAXIES, INTERSTELLAR DUST, LESS-THAN 0.5, VIRGO CLUSTER GALAXIES, HERSCHEL REFERENCE SURVEY, STELLAR POPULATION SYNTHESIS, SCIENCE DEMONSTRATION PHASE, MASS ASSEMBLY GAMA, submillimetre: galaxies, DIGITAL SKY SURVEY

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Chicago
Dariush, A, S Dib, S Hony, DJB Smith, S Zhukovska, L Dunne, S Eales, et al. 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): 2221–2259.
APA
Dariush, A., Dib, S., Hony, S., Smith, D., Zhukovska, S., Dunne, L., Eales, S., et al. (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), 2221–2259.
Vancouver
1.
Dariush A, Dib S, Hony S, Smith D, Zhukovska S, Dunne L, et al. H-ATLAS/GAMA : the nature and characteristics of optically red galaxies detected at submillimetre wavelengths. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2016;456(2):2221–59.
MLA
Dariush, A, S Dib, S Hony, et al. “H-ATLAS/GAMA : the Nature and Characteristics of Optically Red Galaxies Detected at Submillimetre Wavelengths.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 456.2 (2016): 2221–2259. Print.
@article{8096778,
  abstract     = {We combine Herschel/SPIRE submillimetre (submm) observations with existing multiwavelength 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 {\textlangle}= z {\textlangle}= 0.2, having {\textrangle} 5s detections in the SPIRE 250 mu m 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 approximate to 4.2 per cent of the total number of sources with stellar masses M* {\textrangle}= 1010 M-circle dot. Following visual classification of the red galaxies, we find that greater than or similar to 30 per cent of them are early-type galaxies and greater than or similar to 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 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.},
  author       = {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, Maarten and Baldry, I 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 De Zotti, G 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},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {STAR-FORMATION,galaxies: general,ELLIPTIC GALAXIES,INTERSTELLAR DUST,LESS-THAN 0.5,VIRGO CLUSTER GALAXIES,HERSCHEL REFERENCE SURVEY,STELLAR POPULATION SYNTHESIS,SCIENCE DEMONSTRATION PHASE,MASS ASSEMBLY GAMA,submillimetre: galaxies,DIGITAL SKY SURVEY},
  language     = {eng},
  number       = {2},
  pages        = {2221--2259},
  title        = {H-ATLAS/GAMA : the nature and characteristics of optically red galaxies detected at submillimetre wavelengths},
  url          = {http://dx.doi.org/10.1093/mnras/stv2767},
  volume       = {456},
  year         = {2016},
}

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