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Peters, S. P. C. van der Kruit, P. C. Allen, R. J. and Freeman, K. C. 2017. The shape of dark matter haloes – I. H i observations of edge-on galaxies. Monthly Notices of the Royal Astronomical Society, Vol. 464, Issue. 1, p. 2.
Allaert, F. Gentile, G. Baes, M. De Geyter, G. Hughes, T. M. Lewis, F. Bianchi, S. De Looze, I. Fritz, J. Holwerda, B. W. Verstappen, J. and Viaene, S. 2015. HERschelObservations of Edge-on Spirals (HEROES). Astronomy & Astrophysics, Vol. 582, p. A18.
O'Brien, J. C. Freeman, K. C. van der Kruit, P C. and Bosma, A. 2010. The dark matter halo shape of edge-on disk galaxies. Astronomy and Astrophysics, Vol. 515, p. A60.
Bureau, M. Aronica, G. Athanassoula, E. Dettmar, R.- J. Bosma, A. and Freeman, K. C. 2006. K-band observations of boxy bulges - I. Morphology and surface brightness profiles. Monthly Notices of the Royal Astronomical Society, Vol. 370, Issue. 2, p. 753.
Athanassoula, E. and Bureau, M. 1999. Bar Diagnostics in Edge‐on Spiral Galaxies. II. Hydrodynamical Simulations. The Astrophysical Journal, Vol. 522, Issue. 2, p. 699.
Bureau, M. and Athanassoula, E. 1999. Bar Diagnostics in Edge‐on Spiral Galaxies. I. The Periodic Orbits Approach. The Astrophysical Journal, Vol. 522, Issue. 2, p. 686.
Griv, Evgeny and Chiueh, Tzihong 1998. Central NGC 2146: A Firehose‐Type Bending Instability in the Disk of Newly Formed Stars?. The Astrophysical Journal, Vol. 503, Issue. 1, p. 186.
The formation mechanism of boxy/peanut-shaped bulges in spiral galaxies has been a problem for many years. We briefly review here the possible formation scenarios for boxy/peanut bulges, concentrating on both the bar-buckling and accretion hypotheses, and then describe an observational program aimed at testing those various theories and studying the vertical structure of edge-on bars. Our program includes optical long-slit spectroscopy, Hi line-imaging, near-infrared imaging, and multi-band optical imaging. New spectroscopic results (both optical and Hi) are presented on seven galaxies, including five boxy/peanut-bulge spirals. Based on Kuijken & Merrifield's (1995) idea for detecting edge-on bars, we argue that these observations constitute a strong case in favour of the bar-buckling mechanism for the formation of boxy/peanut-shaped bulges, but they also raise many questions and prompt for more detailed modelling to be made. The implications of the observations concerning the determination of rotation curves and of the physical conditions in bulges are also discussed.
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