Detected shell candidates in NGC 3923.
|Label||Major-axis radius [′′]||Prominence||Data||Detection method||Figures||Note|
|S2||−952||4||MC||1||A.1, A.2||MP, 907–1012′′, highly uncertain, possibly merged star halos|
|S3||−846||1||MC||1||A.1, A.2, A.8||narrow, connected with the “progenitor”|
|S4||−630||3||MC||1||A.1, A.2, A.8||MP, 640–590′′, irregular, diffuse, near the end of the “stream”|
|S5||+490||3||MC||1||A.1, A.3, A.8||MP, possibly other tidal feature, small azimuthal extent, opposite S8, connected with the “hook”, shells at lower radii have surface brightness increased at the azimuth of this shell|
|S6||−430||4||MC||3||A.2, A.3||MP, very diffuse and faint, highly uncertain|
|S7||+363||1||MC||1||A.1, A.3, A.8|
|S8||−338||3||MC||3||A.2, A.3, A.8||MP, not on axis, only in the eastern half, opposite S5, shells at lower radii are brighter on the azimuth of S8|
|S9||+331||3||MC||3||A.3||copies the edge of S7 but lower azimuthal extent|
|S11||+260||3||MC||3||A.3||MP, very diffuse, a smooth step in surface brightness, possibly other tidal feature|
|S12||−237||4||MC||3||A.3||MP, sharp-edged, small azimuthal extent, possibly other tidal feature|
|S20||−92.0||4||HST||3||A.4||MP, very faint and diffuse, smooth step in surface brightness, possibly other tidal feature|
|S22||−78.4||2||MC, HST||1||A.4, A.5||sharpness varies with azimuth|
|S23||+72.8||2||MC, HST||1||A.4, A.5, A.6|
|S24||−71.4||3||MC, HST||3||A.4, A.5||MP, not on axis, only in the western half, diffuse, possibly other tidal feature|
|S25||−68.6||1||MC, HST||1||A.4, A.5|
|S26||+64.8||3||MC, HST||3||A.4, A.5|
|S27||+60.0||2||MC, HST||1||A.4, A.5|
|S28||−60.0||3||MC, HST||3||A.4, A.5||MP, diffuse, possibly other tidal feature|
|S29||−55.9||1||MC, HST||1||A.5, A.6|
|S30||+51.0||1||MC, HST||1||A.5||very prominent|
|S31||−49.0||3||MC, HST||3||A.5||MP, diffuse, possibly other tidal feature|
|S32||+45.4||3||HST||3||A.5||MP, diffuse, probably the shell at 41.5′′ in Sikkema et al. (2007)|
|S33||−44.7||1||MC, HST||1||A.5, A.6, A.7||very prominent|
|S34||+38.0||3||MC, HST||3||A.5||MP, very faint on axis, well defined on the western half|
|S35||−37.5||3||MC, HST||3||A.5, A.7||diffuse|
|S36||+34.8||1||MC, HST||1||A.5, A.6, A.7|
|S37||−30.8||3||HST||2||A.6, A.7||bright smooth step in surface brightness, possibly other tidal feature, probably the shell at −28.7′′ in Sikkema et al. (2007)|
|S38||+29.5||1||MC, HST||1||A.5, A.6, A.7|
|S39||−24.2||4||MC, HST||3||A.6, A.7||MP, highly questionable, faint, small azimuthal extent, possibly edge of a faint dust cloud|
|S40||+19.8||1||MC, HST||2||A.6, A.7||very prominent after model subraction, abrupt cutoff in azimuth|
|S41||−18.1||1||MC, HST||1||A.6, A.7||abrupt cutoff in azimuth|
|S42||−10.8||3||MC, HST||3||A.7||MP, very faint|
Notes. Label – Shell designation. Radius – Shell radius in arcseconds. Shells lying on the north-eastern side of the galaxy have the positive sign; the shells on the south-western side of the galaxy have the negative sign. Prominence – 1 = Prominent and sharp-edged; 2 = Prominent and diffuse-edged; 3 = Faint but probably existent; 4 = Questionable. Data – The image where the shell was detected: our observation with MegaCam (MC) or the archival HST image (Sikkema et al. 2006). Detection method – A method allowing a good detection of the shell: 1 = No processing; 2 = Model subtraction; 3 = Minimum masking (Sect. 2.3, Appendix B). Figures – The figures showing the shell. Notes – MP = Missed by the previous observations.
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