92 research outputs found
Spiral Galaxies with Thick Box/Peanut Bulges
The close connection between bars and box/peanut-shaped bulges is observationally and theoretically supported. However, for the class of thick box/peanut-shaped bulges an environmental hypothesis instead of an internal mechanism is suggested to account for the prominence of the box/peanut component. The main goal of this thesis is to present a multi-wavelength study of the kinematics and the morphology in a sample of thick box/peanut-shaped bulges in order to find out relics of interactions. A new technique to derive the rotation curve from the HI observation will be presented. All these new results suggest a scenario in which interactions play a significant role in the history of thick box/peanut-shaped bulge galaxies and they have likely experienced a mass infall
United in Diversity, Divided in Adversity? Support for Right-Wing Eurosceptic Parties in the Face of Threat Differs Across Nations
This is the final version. Available on open access from Frontiers Media via the DOI in this recordThis article investigates whether the perceived threat of terrorism explains the support for right-wing
Eurosceptic parties and Euroscepticism above and beyond other relevant variables, including
perceived economic and immigration threats. We first examined the entire Eurobarometer samples of
2014 and 2015, and then conducted survey experiments in four EU countries, that is, UK (N=197),
France (N=164), Italy (N=312), and Romania (N=144). Our findings suggest that the perceived threat
of terrorism has a small effect on the negative attitudes towards the EU above and beyond the effect
of immigration and economic threats and other basic control variables. The relationship between
these variables varies across countries and it is less linear than we might expect
Dating the formation of the counter-rotating stellar disc in the spiral galaxy NGC 5719 by disentangling its stellar populations
We present the results of the VLT/VIMOS integral-field spectroscopic
observations of the inner 28"x28" (3.1 kpc x 3.1 kpc) of the interacting spiral
NGC 5719, which is known to host two co-spatial counter-rotating stellar discs.
At each position in the field of view, the observed galaxy spectrum is
decomposed into the contributions of the spectra of two stellar and one
ionised-gas components. We measure the kinematics and the line strengths of the
Lick indices of the two stellar counter-rotating components. We model the data
of each stellar component with single stellar population models that account
for the alpha/Fe overabundance. We also derive the distribution and kinematics
of the ionised-gas disc, that is associated with the younger, less rich in
metals, more alpha-enhanced, and less luminous stellar component. They are both
counter-rotating with respect the main stellar body of the galaxy. These
findings prove the scenario where gas was accreted first by NGC 5719 onto a
retrograde orbit from the large reservoir available in its neighbourhoods as
the result of the interaction with its companion NGC 5713, and subsequently
fuelled the in situ formation of the counter-rotating stellar disc.Comment: 5 pages, 4 figures. Accepted for publication in MNRAS letters.
Reference list update
The SINS/zC-SINF survey of z~2 galaxy kinematics: Outflow properties
Based on SINFONI Ha, [NII] and [SII] AO data of 30 z \sim 2 star-forming
galaxies (SFGs) from the SINS and zcSINF surveys, we find a strong correlation
of the Ha broad flux fraction with the star formation surface density of the
galaxy, with an apparent threshold for strong outflows occurring at 1 Msun
yr^-1 kpc^-2. Above this threshold, we find that SFGs with logm_\ast>10 have
similar or perhaps greater wind mass loading factors (eta = Mdotout/SFR) and
faster outflow velocities than lower mass SFGs. This trend suggests that the
majority of outflowing gas at z \sim 2 may derive from high-mass SFGs, and that
the z \sim 2 mass-metallicity relation is driven more by dilution of enriched
gas in the galaxy gas reservoir than by the efficiency of outflows. The mass
loading factor is also correlated with the SFR and inclination, such that more
star-forming and face-on galaxies launch more powerful outflows. For galaxies
that have evidence for strong outflows, we find that the broad emission is
spatially extended to at least the half-light radius (\sim a few kpc). We
propose that the observed threshold for strong outflows and the observed mass
loading of these winds can be explained by a simple model wherein break-out of
winds is governed by pressure balance in the disk. Using the ratio of the [SII]
doublet in a broad and narrow component, we find that outflowing gas has a
density of \sim10-100 cm^-3, significantly less than that of the star forming
gas (600 cm^-3).Comment: 7 pages, 3 figures, accepted by Ap
Denture stomatitis treated with photodynamic therapy: five cases
Objective: Photodynamic therapy (PDT) is an effective method for Candida spp. inactivation in vitro and in vivo, but as yet, no clinical trial has been conducted. This report describes 5 cases of denture stomatitis (DS) treated with PDT.\ud
\ud
Study design: Five subjects with clinical and microbiologic diagnosis of DS were submitted to 6 sessions of PDT 3 times a week for 15 days. In each session, patients' dentures and palates were sprayed with 500 mg/L Photogem, and, after 30 minutes of incubation, irradiated by light-emitting diode light source at 455 nm (37.5 and 122 J/cm2, respectively). Cultures of Candida spp. from dentures and palates and standard photographs of the palates were taken at baseline (day 0), at the end of the treatment (day 15), and at follow-up time intervals (days 30 and 60).\ud
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Results: Four patients showed clinical resolution of DS (no inflammation) after PDT sessions, and only 1 subject demonstrated reduction in palatal inflammation. Recurrence of DS was observed in 2 patients during the follow-up period.\ud
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Conclusions: PDT appears to be an alternative treatment for DS.FAPESP (05/02193-4; 05/03226-3
Denture stomatitis treated with photodynamic therapy: five cases
Objective: Photodynamic therapy (PDT) is an effective method for Candida spp. inactivation in vitro and in vivo, but as yet, no clinical trial has been conducted. This report describes 5 cases of denture stomatitis (DS) treated with PDT.\ud
\ud
Study design: Five subjects with clinical and microbiologic diagnosis of DS were submitted to 6 sessions of PDT 3 times a week for 15 days. In each session, patients' dentures and palates were sprayed with 500 mg/L Photogem, and, after 30 minutes of incubation, irradiated by light-emitting diode light source at 455 nm (37.5 and 122 J/cm2, respectively). Cultures of Candida spp. from dentures and palates and standard photographs of the palates were taken at baseline (day 0), at the end of the treatment (day 15), and at follow-up time intervals (days 30 and 60).\ud
\ud
Results: Four patients showed clinical resolution of DS (no inflammation) after PDT sessions, and only 1 subject demonstrated reduction in palatal inflammation. Recurrence of DS was observed in 2 patients during the follow-up period.\ud
\ud
Conclusions: PDT appears to be an alternative treatment for DS.FAPESP (05/02193-4; 05/03226-3
Galaxy stellar mass functions of different morphological types in clusters, and their evolution between z=0.8 and z=0
We present the galaxy stellar mass function (MF) and its evolution in
clusters from z~0.8 to the current epoch, based on the WIde-field Nearby
Galaxy-cluster Survey (WINGS) (0.04<z<0.07), and the ESO Distant Cluster Survey
(EDisCS) (0.4<z <0.8). We investigate the total MF and find it evolves
noticeably with redshift. The shape at M*>10^11 M' does not evolve, but below
M*~10^10.8 M' the MF at high redshift is flat, while in the Local Universe it
flattens out at lower masses. The population of M* = 10^10.2 - 10^10.8 M'
galaxies must have grown significantly between z=0.8 and z=0. We analyze the MF
of different morphological types (ellipticals, S0s and late-types), and find
that also each of them evolves with redshift. All types have proportionally
more massive galaxies at high- than at low-z, and the strongest evolution
occurs among S0 galaxies. Examining the morphology-mass relation (the way the
proportion of galaxies of different morphological types changes with galaxy
mass), we find it strongly depends on redshift. At both redshifts, ~40% of the
stellar mass is in elliptical galaxies. Another ~43% of the mass is in S0
galaxies in local clusters, while it is in spirals in distant clusters. To
explain the observed trends, we discuss the importance of those mechanisms that
could shape the MF. We conclude that mass growth due to star formation plays a
crucial role in driving the evolution. It has to be accompanied by infall of
galaxies onto clusters, and the mass distribution of infalling galaxies might
be different from that of cluster galaxies. However, comparing with high-z
field samples, we do not find conclusive evidence for such an environmental
mass segregation. Our results suggest that star formation and infall change
directly the MF of late-type galaxies in clusters and, indirectly, that of
early-type galaxies through subsequent morphological transformations.Comment: MNRAS in press, 24 pages, 19 figures and 8 table
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