The Tully-Fisher relation in dense groups at $z sim 0.7$ in the MAGIC survey. (arXiv:2101.08069v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Abril_Melgarejo_V/0/1/0/all/0/1">Valentina Abril-Melgarejo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Epinat_B/0/1/0/all/0/1">Benoît Epinat</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mercier_W/0/1/0/all/0/1">Wilfried Mercier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Contini_T/0/1/0/all/0/1">Thierry Contini</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boogaard_L/0/1/0/all/0/1">Leindert A. Boogaard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brinchmann_J/0/1/0/all/0/1">Jarle Brinchmann</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Finley_H/0/1/0/all/0/1">Hayley Finley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Michel_Dansac_L/0/1/0/all/0/1">Léo Michel-Dansac</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ventou_E/0/1/0/all/0/1">Emmy Ventou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Amram_P/0/1/0/all/0/1">Philipe Amram</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Krajnovic_D/0/1/0/all/0/1">Davor Krajnović</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mahler_G/0/1/0/all/0/1">Guillaume Mahler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pineda_J/0/1/0/all/0/1">Juan C. B. Pineda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Richard_J/0/1/0/all/0/1">Johan Richard</a>
Galaxies in dense environments are subject to interactions and mechanisms
which directly affect their evolution by lowering their gas fractions and
reducing their star-forming capacity earlier than their isolated counterparts.
The aim of our project is to get new insights about the role of environment on
the stellar and baryonic content of galaxies using a kinematic approach,
through the study of the Tully-Fisher relation (TFR). We study a sample of
galaxies in 8 groups spanning a redshift range of $0.5<z<0.8$ and located in 10
pointings of the MAGIC MUSE Guaranteed Time Observations program. We perform a
morpho-kinematics analysis of this sample and set up a selection based on
galaxy size, [OII] emission line doublet signal-to-noise ratio, bulge-to-disk
ratio and nuclear activity to construct a robust kinematic sample of 67
star-forming galaxies. This selection considerably reduces the number of
outliers in the TFR, which are predominantly dispersion-dominated galaxies. Our
results suggest a significant offset of the TFR zero-point between galaxies in
low- and high-density environments, whatever kinematics estimator is used. This
can be interpreted as a decrease of either stellar mass by $sim 0.05 – 0.3$
dex or an increase of rotation velocity by $sim 0.02 – 0.06$ dex for galaxies
in groups, depending on the samples used for comparison. We also studied the
stellar and baryon mass fractions within stellar disks and found they both
increase with stellar mass, the trend being more pronounced for the stellar
component alone. These fractions do not exceed 50%. We show that this evolution
of the TFR is consistent either with a decrease of star formation or with a
contraction of the mass distribution due to the environment. These two effects
probably act together with their relative contribution depending on the mass
regime.
Galaxies in dense environments are subject to interactions and mechanisms
which directly affect their evolution by lowering their gas fractions and
reducing their star-forming capacity earlier than their isolated counterparts.
The aim of our project is to get new insights about the role of environment on
the stellar and baryonic content of galaxies using a kinematic approach,
through the study of the Tully-Fisher relation (TFR). We study a sample of
galaxies in 8 groups spanning a redshift range of $0.5<z<0.8$ and located in 10
pointings of the MAGIC MUSE Guaranteed Time Observations program. We perform a
morpho-kinematics analysis of this sample and set up a selection based on
galaxy size, [OII] emission line doublet signal-to-noise ratio, bulge-to-disk
ratio and nuclear activity to construct a robust kinematic sample of 67
star-forming galaxies. This selection considerably reduces the number of
outliers in the TFR, which are predominantly dispersion-dominated galaxies. Our
results suggest a significant offset of the TFR zero-point between galaxies in
low- and high-density environments, whatever kinematics estimator is used. This
can be interpreted as a decrease of either stellar mass by $sim 0.05 – 0.3$
dex or an increase of rotation velocity by $sim 0.02 – 0.06$ dex for galaxies
in groups, depending on the samples used for comparison. We also studied the
stellar and baryon mass fractions within stellar disks and found they both
increase with stellar mass, the trend being more pronounced for the stellar
component alone. These fractions do not exceed 50%. We show that this evolution
of the TFR is consistent either with a decrease of star formation or with a
contraction of the mass distribution due to the environment. These two effects
probably act together with their relative contribution depending on the mass
regime.
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