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

S Kaviraj, K Rowlands, M Alpaslan, L Dunne, YS Ting, M Bureau, S Shabala, CJ Lintott, DJB Smith, N Agius, et al. (2013) MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 435(2). p.1463-1468
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
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
journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Mon. Not. Roy. Astron. Soc.
volume
435
issue
2
pages
1463 - 1468
Web of Science type
Article
Web of Science id
000325264600039
JCR category
ASTRONOMY & ASTROPHYSICS
JCR impact factor
5.226 (2013)
JCR rank
11/59 (2013)
JCR quartile
1 (2013)
ISSN
0035-8711
DOI
10.1093/mnras/stt1629
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
4385345
handle
http://hdl.handle.net/1854/LU-4385345
date created
2014-05-16 11:42:11
date last changed
2017-02-28 13:20:44
@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},
}

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.