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Abstract
We use mid-infrared 3.6 and 4.5 mu m imaging of NGC 3906 from the Spitzer Survey of Stellar Structure in Galaxies (S(4)G) to understand the nature of an unusual offset between its stellar bar and the photometric center of an otherwise regular, circular outer stellar disk. We measure an offset of similar to 910 pc between the center of the stellar bar and photometric center of the stellar disk; the bar center coincides with the kinematic center of the disk determined from previous HI observations. Although the undisturbed shape of the disk suggests that NGC 3906 has not undergone a significant merger event in its recent history, the most plausible explanation for the observed offset is an interaction. Given the relatively isolated nature of NGC 3906 this interaction could be with dark matter substructure in the galaxy's halo or from a recent interaction with a fast moving neighbor that remains to be identified. Simulations aimed at reproducing the observed offset between the stellar bar/kinematic center of the system and the photometric center of the disk are necessary to confirm this hypothesis and constrain the interaction history of the galaxy.
Keywords
LARGE-MAGELLANIC-CLOUD, STELLAR STRUCTURE, GALAXIES S(4)G, STAR-FORMATION, SPITZER SURVEY, SMALL COMPANIONS, GAS, DECOMPOSITION, SIMULATIONS, PARAMETERS, galaxies: evolution, galaxies: formation, galaxies: structure

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MLA
de Swardt, Bonita, et al. “The Odd Offset between the Galactic Disk and Its Bar in NGC 3906.” ASTROPHYSICAL JOURNAL, vol. 808, no. 1, 2015.
APA
de Swardt, B., Sheth, K., Kim, T., Pardy, S., D’ Onghia, E., Wilcots, E., … Zaritsky, D. (2015). The odd offset between the galactic disk and its bar in NGC 3906. ASTROPHYSICAL JOURNAL, 808(1).
Chicago author-date
Swardt, Bonita de, Kartik Sheth, Taehyun Kim, Stephen Pardy, Elena D’ Onghia, Eric Wilcots, Joannah Hinz, et al. 2015. “The Odd Offset between the Galactic Disk and Its Bar in NGC 3906.” ASTROPHYSICAL JOURNAL 808 (1).
Chicago author-date (all authors)
de Swardt, Bonita, Kartik Sheth, Taehyun Kim, Stephen Pardy, Elena D’ Onghia, Eric Wilcots, Joannah Hinz, Juan-Carlos Munoz-Mateos, Michael W Regan, E Athanassoula, Albert Bosma, Ronald J Buta, Mauricio Cisternas, Sebastien Comeron, Dimitri A Gadotti, Armando Gil de Paz, Thomas H Jarrett, Bruce G Elmegreen, Santiago Erroz-Ferrer, Luis C Ho, Johan H Knapen, Jarkko Laine, Eija Laurikainen, Barry F Madore, Sharon Meidt van der Wel, Karin Menendez-Delmestre, Chien Y Peng, Heikki Salo, Eva Schinnerer, and Dennis Zaritsky. 2015. “The Odd Offset between the Galactic Disk and Its Bar in NGC 3906.” ASTROPHYSICAL JOURNAL 808 (1).
Vancouver
1.
de Swardt B, Sheth K, Kim T, Pardy S, D’ Onghia E, Wilcots E, et al. The odd offset between the galactic disk and its bar in NGC 3906. ASTROPHYSICAL JOURNAL. 2015;808(1).
IEEE
[1]
B. de Swardt et al., “The odd offset between the galactic disk and its bar in NGC 3906,” ASTROPHYSICAL JOURNAL, vol. 808, no. 1, 2015.
@article{8622276,
  abstract     = {We use mid-infrared 3.6 and 4.5 mu m imaging of NGC 3906 from the Spitzer Survey of Stellar Structure in Galaxies (S(4)G) to understand the nature of an unusual offset between its stellar bar and the photometric center of an otherwise regular, circular outer stellar disk. We measure an offset of similar to 910 pc between the center of the stellar bar and photometric center of the stellar disk; the bar center coincides with the kinematic center of the disk determined from previous HI observations. Although the undisturbed shape of the disk suggests that NGC 3906 has not undergone a significant merger event in its recent history, the most plausible explanation for the observed offset is an interaction. Given the relatively isolated nature of NGC 3906 this interaction could be with dark matter substructure in the galaxy's halo or from a recent interaction with a fast moving neighbor that remains to be identified. Simulations aimed at reproducing the observed offset between the stellar bar/kinematic center of the system and the photometric center of the disk are necessary to confirm this hypothesis and constrain the interaction history of the galaxy.},
  articleno    = {90},
  author       = {de Swardt, Bonita and Sheth, Kartik and Kim, Taehyun and Pardy, Stephen and D' Onghia, Elena and Wilcots, Eric and Hinz, Joannah and Munoz-Mateos, Juan-Carlos and Regan, Michael W and Athanassoula, E and Bosma, Albert and Buta, Ronald J and Cisternas, Mauricio and Comeron, Sebastien and Gadotti, Dimitri A and Gil de Paz, Armando and Jarrett, Thomas H and Elmegreen, Bruce G and Erroz-Ferrer, Santiago and Ho, Luis C and Knapen, Johan H and Laine, Jarkko and Laurikainen, Eija and Madore, Barry F and van der Wel, Sharon Meidt and Menendez-Delmestre, Karin and Peng, Chien Y and Salo, Heikki and Schinnerer, Eva and Zaritsky, Dennis},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {LARGE-MAGELLANIC-CLOUD,STELLAR STRUCTURE,GALAXIES S(4)G,STAR-FORMATION,SPITZER SURVEY,SMALL COMPANIONS,GAS,DECOMPOSITION,SIMULATIONS,PARAMETERS,galaxies: evolution,galaxies: formation,galaxies: structure},
  language     = {eng},
  number       = {1},
  pages        = {8},
  title        = {The odd offset between the galactic disk and its bar in NGC 3906},
  url          = {http://dx.doi.org/10.1088/0004-637X/808/1/90},
  volume       = {808},
  year         = {2015},
}

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