Bibcode
Raj, M. A.; Iodice, E.; Napolitano, N. R.; Spavone, M.; Su, H.-S.; Peletier, R. F.; Davis, T. A.; Zabel, N.; Hilker, M.; Mieske, S.; Falcon Barroso, J.; Cantiello, M.; van de Ven, G.; Watkins, A. E.; Salo, H.; Schipani, P.; Capaccioli, M.; Venhola, A.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 628, id.A4, 37 pp.
Advertised on:
8
2019
Revista
Número de citas
27
Número de citas referidas
24
Descripción
Context. We present the study of a magnitude limited sample
(mB ≤ 16.6 mag) of 13 late type galaxies (LTGs), observed
inside the virial radius, Rvir ˜ 0.7 Mpc, of the Fornax
cluster within the Fornax Deep Survey (FDS). Aims: The main
objective is to use surface brightness profiles and g - i colour maps to
obtain information on the internal structure of these galaxies and find
signatures of the mechanisms that drive their evolution in high-density
environments inside the virial radius of the cluster. Methods: By
modelling galaxy isophotes, we extract the azimuthally averaged surface
brightness profiles in four optical bands. We also derive g - i colour
profiles, and relevant structural parameters like total magnitude and
effective radius. For ten of the galaxies in this sample, we observe a
clear discontinuity in their typical exponential surface brightness
profiles, derive their "break radius", and classify their disc-breaks
into Type II (down-bending) or Type III (up-bending). Results: We
find that Type II galaxies have bluer average (g - i) colour in their
outer discs while Type III galaxies are redder. The break radius
increases with stellar mass and molecular gas mass while it decreases
with molecular gas-fractions. The inner and outer scale-lengths increase
monotonically with absolute magnitude, as found in other works. For
galaxies with CO(1-0) measurements, there is no detected cold gas beyond
the break radius (within the uncertainties). In the context of
morphological segregation of LTGs in clusters, we also find that, in
Fornax, galaxies with morphological type 5 < T ≤ 9 (˜60% of
the sample) are located beyond the high-density, ETG-dominated regions,
however there is no correlation between T and the disc-break type. We do
not find any correlation between the average (g - i) colours and
cluster-centric distance, but the colour-magnitude relation holds true.
Conclusions: The main results of this work suggest that the
disc-breaks of LTGs inside the virial radius of the Fornax cluster seem
to have arisen through a variety of mechanisms (e.g. ram-pressure
stripping, tidal disruption), which is evident in their outer-disc
colours and the absence of molecular gas beyond their break radius in
some cases. This can result in a variety of stellar populations inside
and outside the break radii.
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