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A Herschel-ATLAS study of dusty spheroids : probing the minor-merger process in the local Universe

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Abstract
We use multiwavelength (0.12-500 mu m) photometry from Herschel-ATLAS, WISE, UKIDSS, SDSS and GALEX to study 23 nearby spheroidal galaxies with prominent dust lanes (DLSGs). DLSGs are considered to be remnants of recent minor mergers, making them ideal laboratories for studying both the interstellar medium (ISM) of spheroids and minor-merger-driven star formation in the nearby Universe. The DLSGs exhibit star formation rates (SFRs) between 0.01 and 10 M-circle dot yr(-1), with a median of 0.26 M-circle dot yr(-1) (a factor of 3.5 greater than the average SG). The median dust mass, dust-to-stellar mass ratio and dust temperature in these galaxies are around 10(7.6) M-circle dot, approximate to 0.05 per cent and approximate to 19.5 K, respectively. The dust masses are at least a factor of 50 greater than that expected from stellar mass loss and, like the SFRs, show no correlation with galaxy luminosity, suggesting that both the ISM and the star formation have external drivers. Adopting literature gas-to-dust ratios and star formation histories derived from fits to the panchromatic photometry, we estimate that the median current and initial gas-to-stellar mass ratios in these systems are approximate to 4 and approximate to 7 per cent, respectively. If, as indicated by recent work, minor mergers that drive star formation in spheroids with (NUV - r) > 3.8 (the colour range of our DLSGs) have stellar mass ratios between 1:6 and 1:10, then the satellite gas fractions are likely >= 50 per cent.
Keywords
galaxies: evolution, galaxies: formation, cD, galaxies: elliptical and lenticular, galaxies: interactions, galaxies: ISM, EARLY-TYPE GALAXIES, SCIENCE DEMONSTRATION PHASE, RECENT STAR-FORMATION, MASS ASSEMBLY GAMA, DIGITAL-SKY-SURVEY, INFRARED-EMISSION, ELLIPTIC GALAXIES, SIMPLE-MODEL, DATA RELEASE, ZOO DUST

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Citation

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Chicago
Kaviraj, S, K Rowlands, M Alpaslan, L Dunne, YS Ting, M Bureau, S Shabala, et al. 2013. “A Herschel-ATLAS Study of Dusty Spheroids : Probing the Minor-merger Process in the Local Universe.” Monthly Notices of the Royal Astronomical Society 435 (2): 1463–1468.
APA
Kaviraj, S., Rowlands, K., Alpaslan, M., Dunne, L., Ting, Y., Bureau, M., Shabala, S., et al. (2013). A Herschel-ATLAS study of dusty spheroids : probing the minor-merger process in the local Universe. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 435(2), 1463–1468.
Vancouver
1.
Kaviraj S, Rowlands K, Alpaslan M, Dunne L, Ting Y, Bureau M, et al. A Herschel-ATLAS study of dusty spheroids : probing the minor-merger process in the local Universe. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2013;435(2):1463–8.
MLA
Kaviraj, S, K Rowlands, M Alpaslan, et al. “A Herschel-ATLAS Study of Dusty Spheroids : Probing the Minor-merger Process in the Local Universe.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 435.2 (2013): 1463–1468. Print.
@article{4385345,
  abstract     = {We use multiwavelength (0.12-500 mu m) photometry from Herschel-ATLAS, WISE, UKIDSS, SDSS and GALEX to study 23 nearby spheroidal galaxies with prominent dust lanes (DLSGs). DLSGs are considered to be remnants of recent minor mergers, making them ideal laboratories for studying both the interstellar medium (ISM) of spheroids and minor-merger-driven star formation in the nearby Universe. The DLSGs exhibit star formation rates (SFRs) between 0.01 and 10 M-circle dot yr(-1), with a median of 0.26 M-circle dot yr(-1) (a factor of 3.5 greater than the average SG). The median dust mass, dust-to-stellar mass ratio and dust temperature in these galaxies are around 10(7.6) M-circle dot, approximate to 0.05 per cent and approximate to 19.5 K, respectively. The dust masses are at least a factor of 50 greater than that expected from stellar mass loss and, like the SFRs, show no correlation with galaxy luminosity, suggesting that both the ISM and the star formation have external drivers. Adopting literature gas-to-dust ratios and star formation histories derived from fits to the panchromatic photometry, we estimate that the median current and initial gas-to-stellar mass ratios in these systems are approximate to 4 and approximate to 7 per cent, respectively. If, as indicated by recent work, minor mergers that drive star formation in spheroids with (NUV - r) {\textrangle} 3.8 (the colour range of our DLSGs) have stellar mass ratios between 1:6 and 1:10, then the satellite gas fractions are likely {\textrangle}= 50 per cent.},
  author       = {Kaviraj, S and Rowlands, K and Alpaslan, M and Dunne, L and Ting, YS and Bureau, M and Shabala, S and Lintott, CJ and Smith, DJB and Agius, N and Auld, R and Baes, Maarten and Bourne, N and Cava, A and Clements, DL and Cooray, A and Dariush, A and De Zotti, G and Driver, SP and Eales, S and Hopwood, R and Hoyos, C and Ibar, E and Maddox, S and Michalowski, Michal and Sansom, AE and Smith, M and Valiante, E},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {galaxies: evolution,galaxies: formation,cD,galaxies: elliptical and lenticular,galaxies: interactions,galaxies: ISM,EARLY-TYPE GALAXIES,SCIENCE DEMONSTRATION PHASE,RECENT STAR-FORMATION,MASS ASSEMBLY GAMA,DIGITAL-SKY-SURVEY,INFRARED-EMISSION,ELLIPTIC GALAXIES,SIMPLE-MODEL,DATA RELEASE,ZOO DUST},
  language     = {eng},
  number       = {2},
  pages        = {1463--1468},
  title        = {A Herschel-ATLAS study of dusty spheroids : probing the minor-merger process in the local Universe},
  url          = {http://dx.doi.org/10.1093/mnras/stt1629},
  volume       = {435},
  year         = {2013},
}

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