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Herschel-ATLAS/GAMA: dusty early-type galaxies and passive spirals

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Abstract
We present the dust properties and star formation histories of local submillimetre-selected galaxies, classified by optical morphology. Most of the galaxies are late types and very few are early types. The early-type galaxies (ETGs) that are detected contain as much dust as typical spirals, and form a unique sample that has been blindly selected at submillimetre wavelengths. Additionally, we investigate the properties of the most passive, dusty spirals. We morphologically classify 1087 galaxies detected in the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) Science Demonstration Phase data. Comparing to a control sample of optically selected galaxies, we find 5.5 per cent of luminous ETGs are detected in H-ATLAS. The H-ATLAS ETGs contain a significant mass of cold dust: the mean dust mass is 5.5 x 10(7)M(circle dot), with individual galaxies ranging from 9 x 10(5) to 4 x 10(8)M(circle dot). This is comparable to that of spiral galaxies in our sample, and is an order of magnitude more dust than that found for the control early-types, which have a median dust mass inferred from stacking of (0.8-4.0) x 10(6)M(circle dot) for a cold dust temperature of 25-15 K. The early-types detected in H-ATLAS tend to have bluer NUV - r colours, higher specific star formation rates and younger stellar populations than early-types which are optically selected, and may be transitioning from the blue cloud to the red sequence. We also find that H-ATLAS and control early-types inhabit similar low-density environments. We investigate whether the observed dust in H-ATLAS early-types is from evolved stars, or has been acquired from external sources through interactions and mergers. We conclude that the dust in H-ATLAS and control ETGs cannot be solely from stellar sources, and a large contribution from dust formed in the interstellar medium or external sources is required. Alternatively, dust destruction may not be as efficient as predicted. We also explore the properties of the most passive spiral galaxies in our sample with specific star formation rate (SSFR) < 10(-11) yr(-1). We find these passive spirals have lower dust-to-stellar mass ratios, higher stellar masses and older stellar population ages than normal spirals. The passive spirals inhabit low-density environments similar to those of the normal spiral galaxies in our sample. This shows that the processes which turn spirals passive do not occur solely in the intermediate-density environments of group and cluster outskirts.
Keywords
infrared: galaxies, submillimetre: galaxies, DIGITAL-SKY-SURVEY, RECENT STAR-FORMATION, MASS ASSEMBLY GAMA, NEARBY ELLIPTIC GALAXIES, SCIENCE DEMONSTRATION PHASE, ACTIVE GALACTIC NUCLEI, X-RAY-EMISSION, LOW-REDSHIFT GALAXIES, RED-SEQUENCE, STELLAR MASS, dust, extinction, galaxies: elliptical and lenticular, galaxies: evolution, cD

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Citation

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Chicago
Rowlands, K, L Dunne, S Maddox, N Bourne, HL Gomez, S Kaviraj, SP Bamford, et al. 2012. “Herschel-ATLAS/GAMA: Dusty Early-type Galaxies and Passive Spirals.” Monthly Notices of the Royal Astronomical Society 419 (3): 2545–2578.
APA
Rowlands, K., Dunne, L., Maddox, S., Bourne, N., Gomez, H., Kaviraj, S., Bamford, S., et al. (2012). Herschel-ATLAS/GAMA: dusty early-type galaxies and passive spirals. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 419(3), 2545–2578.
Vancouver
1.
Rowlands K, Dunne L, Maddox S, Bourne N, Gomez H, Kaviraj S, et al. Herschel-ATLAS/GAMA: dusty early-type galaxies and passive spirals. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2012;419(3):2545–78.
MLA
Rowlands, K, L Dunne, S Maddox, et al. “Herschel-ATLAS/GAMA: Dusty Early-type Galaxies and Passive Spirals.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 419.3 (2012): 2545–2578. Print.
@article{2113635,
  abstract     = {We present the dust properties and star formation histories of local submillimetre-selected galaxies, classified by optical morphology. Most of the galaxies are late types and very few are early types. The early-type galaxies (ETGs) that are detected contain as much dust as typical spirals, and form a unique sample that has been blindly selected at submillimetre wavelengths. Additionally, we investigate the properties of the most passive, dusty spirals. 
We morphologically classify 1087 galaxies detected in the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) Science Demonstration Phase data. Comparing to a control sample of optically selected galaxies, we find 5.5 per cent of luminous ETGs are detected in H-ATLAS. The H-ATLAS ETGs contain a significant mass of cold dust: the mean dust mass is 5.5 x 10(7)M(circle dot), with individual galaxies ranging from 9 x 10(5) to 4 x 10(8)M(circle dot). This is comparable to that of spiral galaxies in our sample, and is an order of magnitude more dust than that found for the control early-types, which have a median dust mass inferred from stacking of (0.8-4.0) x 10(6)M(circle dot) for a cold dust temperature of 25-15 K. The early-types detected in H-ATLAS tend to have bluer NUV - r colours, higher specific star formation rates and younger stellar populations than early-types which are optically selected, and may be transitioning from the blue cloud to the red sequence. 
We also find that H-ATLAS and control early-types inhabit similar low-density environments. We investigate whether the observed dust in H-ATLAS early-types is from evolved stars, or has been acquired from external sources through interactions and mergers. We conclude that the dust in H-ATLAS and control ETGs cannot be solely from stellar sources, and a large contribution from dust formed in the interstellar medium or external sources is required. Alternatively, dust destruction may not be as efficient as predicted. We also explore the properties of the most passive spiral galaxies in our sample with specific star formation rate (SSFR) {\textlangle} 10(-11) yr(-1). We find these passive spirals have lower dust-to-stellar mass ratios, higher stellar masses and older stellar population ages than normal spirals. The passive spirals inhabit low-density environments similar to those of the normal spiral galaxies in our sample. This shows that the processes which turn spirals passive do not occur solely in the intermediate-density environments of group and cluster outskirts.},
  author       = {Rowlands, K and Dunne, L and Maddox, S and Bourne, N and Gomez, HL and Kaviraj, S and Bamford, SP and Brough, S and Charlot, S and da Cunha, E and Driver, SP and Eales, SA and Hopkins, AM and Kelvin, L and Nichol, RC and Sansom, AE and Sharp, R and Smith, DJB and Temi, P and van der Werf, P and Baes, Maarten and Cava, A and Cooray, A and Croom, SM and Dariush, A and De Zotti, G and Dye, S and Fritz, Jacopo and Hopwood, R and Ibar, E and Ivison, RJ and Liske, J and Loveday, J and Madore, B and Norberg, P and Popescu, CC and Rigby, EE and Robotham, A and Rodighiero, G and Seibert, M and Tuffs, RJ},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {infrared: galaxies,submillimetre: galaxies,DIGITAL-SKY-SURVEY,RECENT STAR-FORMATION,MASS ASSEMBLY GAMA,NEARBY ELLIPTIC GALAXIES,SCIENCE DEMONSTRATION PHASE,ACTIVE GALACTIC NUCLEI,X-RAY-EMISSION,LOW-REDSHIFT GALAXIES,RED-SEQUENCE,STELLAR MASS,dust,extinction,galaxies: elliptical and lenticular,galaxies: evolution,cD},
  language     = {eng},
  number       = {3},
  pages        = {2545--2578},
  title        = {Herschel-ATLAS/GAMA: dusty early-type galaxies and passive spirals},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2011.19905.x},
  volume       = {419},
  year         = {2012},
}

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