6 research outputs found
Formation of SO galaxies through mergers: antitruncated stellar discs resulting from major mergers
No full text© ESO, 2014. Acknowledgements. The authors thank to the anonymous referee for the provided input that helped to improve this publication significantly. The current study would not have been possible without the GalMer database, so the authors would like to acknowledge I.Chilingarian, P.Di Matteo, F. Combes, A.-L.Melchior, and B. Semelin for creating it, and specially P.Di Matteo for her kind support on the models when requested. We really appreciate the helpful discussions with Raffaella Marino (UCM) on the dust extinction of early-type galaxies, as well as the KS2D code, made publicly available by his author, Peter Yoachim (UW). We acknowledge the usage of the HyperLeda database (http://leda.univ-lyon1.fr). This research has made use of the NASA’s Astrophysics Data System and NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under projects AYA2006-12955, AYA2009-10368, AYA2012- 30717, AYA2012-31277, and AYA-67625-CO2-01 from the Spanish Ministry of Science, P3/86 of the Instituto de Astrofísica de Canarias and by de Madrid Regional Government through the AstroMadrid Project (CAM S2009/ESP-1496, http://laeff.cab.inta-csic.es/proyects/astromadrid/main/index.php). Funded by the Spanish MICINN under the Consolider-Ingenio 2010 Program grant CSD2006-0070: "First Science with the GTC" (http://www.iac.es/consolideringenio-gtc/), and by the Spanish programme of International Campus of Excellence Moncloa (CEI).Context. Lenticular galaxies (S0’s) are more likely to host antitruncated (Type-III) stellar discs than galaxies of later Hubble types. Major mergers are popularly considered too violent mechanisms to form these breaks.
Aims. We have investigated whether major mergers can result into S0-like remnants with realistic antitruncated stellar discs or not.
Methods. We have analysed 67 relaxed S0 and E/S0 remnants resulting from dissipative N-body simulations of major mergers from the GalMer database. We have simulated realistic R-band surface brightness profiles of the remnants to identify those with antitruncated stellar discs. Their inner and outer discs and the breaks have been quantitatively characterized to compare with real data.
Results. Nearly 70% of our S0-like remnants are antitruncated, meaning that major mergers that result in S0’s have a high probability of producing Type-III stellar discs. Our remnants lie on top of the extrapolations of the observational trends (towards brighter magnitudes and higher break radii) in several photometric diagrams, due to the higher luminosities and sizes of the simulations compared to observational samples. In scale-free photometric diagrams, simulations and observations overlap and the remnants reproduce the observational trends, so the physical mechanism after antitruncations is highly scalable. We have found novel photometric scaling relations between the characteristic parameters of the antitruncations in real S0’s, which are also reproduced by our simulations. We show that the trends in all the photometric planes can be derived from three basic scaling relations that real and simulated Type-III S0’s fulfill: h_i ∝ R_brkIII, h_o ∝ R_brkIII, and μ_brkIII ∝ R_brkIII, where h_i and h_o are the scalelenghts of the inner and outer discs, and μ_brkIII and R_brkIII are the surface brightness and radius of the breaks. Bars and antitruncations in real S0’s are structurally unrelated phenomena according to the studied photometric planes.
Conclusions. Mayor mergers provide a feasible mechanism to form realistic antitruncated S0 galaxies.Spanish Ministry of Economy and Competitiveness (MINECO)Spanish Ministry of ScienceInstituto de Astrofísica de CanariasMadrid Regional GovernmentSpanish MICINNthe Spanish programme of International Campus of Excellence Moncloa (CEI)Depto. de Física de la Tierra y AstrofísicaFac. de Ciencias FísicasTRUEpu
Performance of the electromagnetic calorimeter of the HERMES experiment.
No full textThe performance of the electromagnetic calorimeter of the HERMES experiment is described. The calorimeter consists of 840 radiation resistant F101 lead-glass counters. The response to positrons up to 27.5 GeV, the comparison between the measured energy and the momentum reconstructed from tracking, long-term stability, hadron rejection and neutral meson invariant mass reconstruction are shown
International Journal of Mathematical Combinatorics, Vol.4A
No full textThe International J.Mathematical Combinatorics (ISSN 1937-1055) is a fully refereed international journal, sponsored by the MADIS of Chinese Academy of Sciences and published in USA quarterly comprising 460 pages approx. per volume, which publishes original research papers and survey articles in all aspects of Smarandache multi-spaces, Smarandache geometries, mathematical combinatorics, non-euclidean geometry and topology and their applications to other sciences
Flexibilidad de tronco y miembro inferior en estudiantes de últimos semestres de un programa de fisioterapia en la ciudad de Cartagena
No full textla investigación realizada para determinar la flexibilidad de tronco y miembros inferiores en estudiantes de último semestre de un programa de Fisioterapia en la ciudad de Cartagena suministro resultados significativos para incentivar a los estilos de vida saludable en un grupo especifico de estudiantes universitarios llevando a cabo el acompañamiento del estudiante en identificar sus limitantes y facilitadores, de esta manera, podemos lograr el
incentivo para los hábitos saludables unificando con la actividad física individualizada, además del impacto en los hallazgos obtenidos en la población universitaria, permite promover planeamientos encaminado a la condición física en otros entornos educativosObjectives: To determine trunk and lower limb flexibility in seventh, eighth, and ninth semester students of a physiotherapy program in Cartagena. Methodology: The methodology used in this study is cross-sectional with a quantitative approach, as it is based on the numerical measurement of the results obtained through flexibility tests. Results: This study was developed based on the data obtained through different flexibility tests in the students of the seventh, eighth and ninth semester of the physiotherapy program, presented through descriptive graphs and reference tables to facilitate the understanding of the research carried out. Conclusion: the research carried out to determine the flexibility of the trunk and lower limbs in students in the last semester of a physiotherapy program in the city of Cartagena provided significant results to encourage healthy lifestyles in a specific group of university students by carrying out the accompaniment of the student in identifying their limitations and facilitators. In this way, we can achieve the incentive for healthy habits by unifying with individualized physical activity, in addition to the impact on the findings obtained in the university population, it allows us to promote planning aimed at physical fitness in other educational environmentsPregradoFisioterapeutaEstudio de tipo transversal con un enfoque cuantitativ
Measurement of using the decay mode
No full textUsing a proton–proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of , the lifetime of the light mass eigenstate, , is measured using the decay mode to be A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb of integrated luminosity gives where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty.Using a proton-proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of 5.7 , the lifetime of the mass eigenstate, , is measured using decay mode to be = 1.445 0.016(stat) 0.008(syst) ps. A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 of integrated luminosity gives = 1.452 0.014 0.007 0.002 ps, where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty
and production in PbNe collisions
No full textThe first measurement of and production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of and mesons is studied with a beam of lead ions with an energy of 2.5 TeV per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of = 68.5 GeV. The production cross-section ratio is studied as a function of rapidity, transverse momentum and collision centrality. These data are compared with measurements from Ne collisions at the same energy. No anomalous suppression that could indicate the formation of a deconfined medium is observed.The first measurement of and production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of and mesons is studied with a beam of lead ions with an energy of 2.5 per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of . The / production cross-section ratio is studied as a function of rapidity, transverse momentum and collision centrality. These data are compared with measurements from collisions at the same energy and show no difference in the observed suppression trend when comparing and PbNe peripheral collisions with PbNe central collisions.The first measurement of and production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of and mesons is studied with a beam of lead ions with an energy of 2.5 TeV per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of = 68.5 GeV. The production cross-section ratio is studied as a function of rapidity, transverse momentum and collision centrality. These data are compared with measurements from Ne collisions at the same energy and show no difference in the observed suppresion trend when comparing Ne and PbNe peripheral collisions with PbNe central collisions
