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2010MNRAS.401..559M - Mon. Not. R. Astron. Soc., 401, 559-576 (2010/January-1)
2MASS photometry of edge-on spiral galaxies - I. Sample and general results.
MOSENKOV A.V., SOTNIKOVA N.Ya. and RESHETNIKOV V.P.
Abstract (from CDS):
(i) The distribution of the apparent bulge axis ratio qb for the subsample with n ≲ 2 can be attributed to triaxial, nearly prolate bulges that are seen from different projections, while n ≳ 2 bulges seem to be oblate spheroids with moderate flattening. Triaxiality of late-type bulges may be due to the presence of a bar that thickened in the vertical direction during its secular evolution.
(ii) For the sample galaxies, the effective radius of the bulge re,b, the disc scalelength h and the disc scaleheight z0 are well correlated. However, there is a clear trend for the ratio re,b/h to increase with n. As n is an indicator of the Hubble type, such a trend unambiguously rules out the widely discussed hypothesis of a scale-free Hubble sequence. The found correlation between z0 and re,bis new and was not described earlier.
(iii) There is a hint that the fundamental planes of discs, which links only disc parameters and the maximum rotational velocity of gas, are different for galaxies with different bulges. This may indicate a real difference of discs in galaxies with low- and high-concentration bulges.
(iv) The most surprising result arises from the investigation of the photometric plane of sample bulges. It turns that the plane is not flat and has a prominent curvature towards small values of n. For bulges, this fact was not noted earlier.
(v) The clear relation between the flattening of stellar discs h/z0 and the relative mass of a spherical component, including a dark halo, is confirmed not for bulgeless galaxies but for galaxies with massive bulges.
Many of our results are in good agreement with the results of other authors, several ones are new. Thus, our sample is very useful for further detailed studying and modelling of the edge-on spiral galaxies.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): galaxies: fundamental parameters - galaxies: general - galaxies: photometry - galaxies: spiral - infrared: galaxies
Simbad objects: 176
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