On the origin of lopsidedness in galaxies as determined from the spitzer survey of stellar structure in galaxies (S4G)

Dennis F Zaritsky, Heikki Salo, Eija Laurikainen, Debra Elmegreen, E. Athanassoula, Albert Bosma, Sébastien Comerón, Santiago Erroz-Ferrer, Bruce Elmegreen, Dimitri A. Gadotti, Armando Gil De Paz, Joannah L. Hinz, Luis C. Ho, Benne W. Holwerda, Taehyun Kim, Johan H. Knapen, Jarkko Laine, Seppo Laine, Barry F. Madore, Sharon MeidtKarin Menendez-Delmestre, Trisha Mizusawa, Juan Carlos Muñoz-Mateos, Michael W. Regan, Mark Seibert, Kartik Sheth

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We study the m = 1 distortions (lopsidedness) in the stellar components of 167 nearby galaxies that span a wide range of morphologies and luminosities. We confirm the previous findings of (1) a high incidence of lopsidedness in the stellar distributions, (2) increasing lopsidedness as a function of radius out to at least 3.5 exponential scale lengths, and (3) greater lopsidedness, over these radii, for galaxies of later type and lower surface brightness. Additionally, the magnitude of the lopsidedness (1) correlates with the character of the spiral arms (stronger arm patterns occur in galaxies with less lopsidedness), (2) is not correlated with the presence or absence of a bar, or the strength of the bar when one is present, (3) is inversely correlated to the stellar mass fraction, f*, within one radial scale length, and (4) correlates directly with f* measured within the radial range over which we measure lopsidedness. We interpret these findings to mean that lopsidedness is a generic feature of galaxies and does not, generally, depend on a rare event, such as a direct accretion of a satellite galaxy onto the disk of the parent galaxy. While lopsidedness may be caused by several phenomena, moderate lopsidedness (〈A1i + 〈A 1o )/2 < 0.3) is likely to reflect halo asymmetries to which the disk responds or a gravitationally self-generated mode. We hypothesize that the magnitude of the stellar response depends both on how centrally concentrated the stars are with respect to the dark matter and whether there are enough stars in the region of the lopsidedness that self-gravity is dynamically important.

Original languageEnglish (US)
Article number135
JournalAstrophysical Journal
Volume772
Issue number2
DOIs
StatePublished - Aug 1 2013

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stellar structure
galaxies
asymmetry
accretion
gravity
stars
radii
stellar mass
halos
dark matter
brightness
incidence
luminosity
gravitation
distribution

Keywords

  • galaxies: fundamental parameters
  • galaxies: kinematics and dynamics
  • galaxies: structure

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

On the origin of lopsidedness in galaxies as determined from the spitzer survey of stellar structure in galaxies (S4G). / Zaritsky, Dennis F; Salo, Heikki; Laurikainen, Eija; Elmegreen, Debra; Athanassoula, E.; Bosma, Albert; Comerón, Sébastien; Erroz-Ferrer, Santiago; Elmegreen, Bruce; Gadotti, Dimitri A.; De Paz, Armando Gil; Hinz, Joannah L.; Ho, Luis C.; Holwerda, Benne W.; Kim, Taehyun; Knapen, Johan H.; Laine, Jarkko; Laine, Seppo; Madore, Barry F.; Meidt, Sharon; Menendez-Delmestre, Karin; Mizusawa, Trisha; Muñoz-Mateos, Juan Carlos; Regan, Michael W.; Seibert, Mark; Sheth, Kartik.

In: Astrophysical Journal, Vol. 772, No. 2, 135, 01.08.2013.

Research output: Contribution to journalArticle

Zaritsky, DF, Salo, H, Laurikainen, E, Elmegreen, D, Athanassoula, E, Bosma, A, Comerón, S, Erroz-Ferrer, S, Elmegreen, B, Gadotti, DA, De Paz, AG, Hinz, JL, Ho, LC, Holwerda, BW, Kim, T, Knapen, JH, Laine, J, Laine, S, Madore, BF, Meidt, S, Menendez-Delmestre, K, Mizusawa, T, Muñoz-Mateos, JC, Regan, MW, Seibert, M & Sheth, K 2013, 'On the origin of lopsidedness in galaxies as determined from the spitzer survey of stellar structure in galaxies (S4G)', Astrophysical Journal, vol. 772, no. 2, 135. https://doi.org/10.1088/0004-637X/772/2/135
Zaritsky, Dennis F ; Salo, Heikki ; Laurikainen, Eija ; Elmegreen, Debra ; Athanassoula, E. ; Bosma, Albert ; Comerón, Sébastien ; Erroz-Ferrer, Santiago ; Elmegreen, Bruce ; Gadotti, Dimitri A. ; De Paz, Armando Gil ; Hinz, Joannah L. ; Ho, Luis C. ; Holwerda, Benne W. ; Kim, Taehyun ; Knapen, Johan H. ; Laine, Jarkko ; Laine, Seppo ; Madore, Barry F. ; Meidt, Sharon ; Menendez-Delmestre, Karin ; Mizusawa, Trisha ; Muñoz-Mateos, Juan Carlos ; Regan, Michael W. ; Seibert, Mark ; Sheth, Kartik. / On the origin of lopsidedness in galaxies as determined from the spitzer survey of stellar structure in galaxies (S4G). In: Astrophysical Journal. 2013 ; Vol. 772, No. 2.
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AU - Zaritsky, Dennis F

AU - Salo, Heikki

AU - Laurikainen, Eija

AU - Elmegreen, Debra

AU - Athanassoula, E.

AU - Bosma, Albert

AU - Comerón, Sébastien

AU - Erroz-Ferrer, Santiago

AU - Elmegreen, Bruce

AU - Gadotti, Dimitri A.

AU - De Paz, Armando Gil

AU - Hinz, Joannah L.

AU - Ho, Luis C.

AU - Holwerda, Benne W.

AU - Kim, Taehyun

AU - Knapen, Johan H.

AU - Laine, Jarkko

AU - Laine, Seppo

AU - Madore, Barry F.

AU - Meidt, Sharon

AU - Menendez-Delmestre, Karin

AU - Mizusawa, Trisha

AU - Muñoz-Mateos, Juan Carlos

AU - Regan, Michael W.

AU - Seibert, Mark

AU - Sheth, Kartik

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