A5083756114- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Lightning and Electromagnetic Phenomena
- Thermal Analysis in Power Transmission
- High voltage insulation and dielectric phenomena
- Geophysics and Gravity Measurements
- History and Developments in Astronomy
- Statistical Mechanics and Entropy
- Geomagnetism and Paleomagnetism Studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Complex Systems and Time Series Analysis
- Cosmology and Gravitation Theories
- Fractional Differential Equations Solutions
- Adaptive optics and wavefront sensing
- Quantum, superfluid, helium dynamics
- Planetary Science and Exploration
- Advanced Statistical Methods and Models
- Quantum Chromodynamics and Particle Interactions
Action for Children
2025
Universidade de São Paulo
2007-2022
Universidade Federal de Minas Gerais
2012-2019
Centro Universitário de Belo Horizonte
2019
Max Planck Society
2018
Museu de Astronomia e Ciências Afins
1992-2017
Instituto de Geofísica y Astronomía
2017
Universidade Federal do Rio Grande do Norte
2005
Universidade Brasil
1983-2005
Universidade Federal de Santa Catarina
2004
We present optical and infrared spectroscopy of the first 2 months evolution Type II supernova SN 1999em. combine these data with high-quality optical/infrared photometry beginning only 3 days after shock breakout, in order to study performance "expanding photosphere method" (EPM) determination distances. With this purpose, we develop a technique measure accurate photospheric velocities by cross-correlating observed model spectra. The application 1999em shows that can reach an average...
We present BUDDA (BUlge/Disk Decomposition Analysis), a new code devoted to perform two-dimensional bulge/disk decomposition directly from the images of galaxies. The bulge component is fitted with generalized Sersic profile whereas disks have an exponential profile. No other components are included. Bars and sub-structures, like lenses, rings, inner bars disks, studied residual obtained through subtraction bulges original images. This means that detailed structural analysis galaxies may be...
We have obtained deep J and Ks images of a sample nine barred galaxies in order to collect reliable homogeneous set which N-body simulations will be compared. The observations were performed using the new near-infrared camera available at 2.1-m telescope Observatorio Astrofisico Guillermo Haro (OAGH) Cananea, Sonora, Mexico. present results surface photometry techniques applied observed images, as well deprojected images. These include radial profiles brightness (elliptically averaged),...
The results of an optical monitoring campaign on the active nucleus in luminous Seyfert 1 galaxy Fairall 9 are presented. This was undertaken parallel with ultraviolet spectroscopic IUE satellite which is described a separate paper. primary purpose this program to measure response times (or "lags") emission lines continuum variations and thus extend range luminosity galactic nuclei (AGNs) for such measurements have been made. main conclusions work as follows:
Along with a brief analysis we present data obtained from BVRI and Ks images of sample 19 galaxies (18 barred 1 unbarred), which will be further explored in future paper. We measured the lengths colors bars, created color maps, estimated global gradients. Applying method developed companion paper, could distinguish for seven our those whose bars have been recently formed ones already evolved bars. an average difference optical between young that may translated to age order 10 Gyr, meaning...
We present here 46 optical spectra of active objects, including Seyfert 2 galaxies (Sy 2), H II galaxies, and LINERs (Low Ionization Nuclear Emission-line Region), observed with low resolution (4 Å) at LNA/CNPq in 1991 1994. The extraction the stellar contribution due to host galaxy is made through subtraction templates built from a population synthesis normal nuclei S E/SO (Bica 1988, A&A;, 195, 76). In Sy LINERs, an old high metallicity predominant, while as expected, younger...
Recent models show that thermally pulsing asymptotic giant branches (TP-AGB) stars should dominate the near-infrared (NIR) spectra of populations 0.3–2 Gyr old, leaving unique signatures can be used to detect young/intermediate stellar population in galaxies. However, no homogeneous data base star-forming galaxies is available NIR fully explore and apply these results. With this mind, we study a sample 23 H ii starburst galaxies, aimed at characterizing most prominent spectral features...
In order to perform a detailed study of the stellar kinematics in vertical axis bars, we obtained high signal-to-noise spectra along major and minor axes bars sample 14 face-on galaxies used them determine line-of-sight velocity distribution, parameterized as Gauss-Hermite series. With these data, developed diagnostic tool that allows one distinguish between recently formed evolved well estimate their ages, assuming form vertically thin disks are recognizable by low values for dispersion σz....
The near-infrared spectral region is becoming a very useful wavelength range to detect and quantify the stellar population of galaxies. Models are developing predict contribution thermally pulsating stars on asymptotic giant branch that should dominate (NIR) spectra populations 0.3 2 Gyr old. When present in given population, these leave unique signatures can be used them unambiguously. However, models have tested homogeneous data base star-forming galaxies, check if results consistent with...
Besides its major objective tuned to the detection of stellar galactic population Gaia mission experiment will also observe a large number galaxies. In this work we intend evaluate and characteristics galaxies that effectively pass onboard selection algorithm Gaia. The objects in be performed section focal plane known as Sky Mapper. Taking into account Video Processing Algorithm criterion considering light profiles discs bulges assess type extra-galactic observed by We show disk very...
We report the first simultaneous zJHK spectroscopy on archetypical Seyfert 2 Galaxy NGC 1068 covering wavelength region 0.9 to 2.4 micron. The slit, aligned in NS direction and centred optical nucleus, maps a 300 pc radius at sub-arcsec resolution, with spectral resolving power of 360 km s^-1. This configuration allow us study physical properties nuclear gas including that north side ionization cone, map strong excess continuum emission K-band attributed dust variations, both flux profile,...
We have performed for the first time in literature a 2D structural analysis on barred lenticular and face--on galaxies NGC 4608 5701. The results indicate that these either never had large disks or their were almost completely destroyed by strong bars, due to secular evolution processes. discuss surprising conclusions checking signs of evolution, considering bar forming instabilities, suggesting, based N-body simulations, new mechanism form bars spheroids, which includes non-spherical halos....
view Abstract Citations (39) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The galactic content of groups galaxies de Souza, R. E. ; Capelato, H. V. Arakaki, L. Logullo, C. Observational facts seem to point the existence a universal mechanism by which elliptical and lenticular are selected over spiral whenever they aggregate in denser structures. Elliptical may result from gradual merging smaller systems. If this is true, it can be expected...
We performed stellar population synthesis on the nuclear and extended regions of NGC 1068 by means near-infrared spectroscopy to disentangle their spectral energy distribution components. This is first time that such a technique applied whole 0.8 - 2.4 micron wavelength interval in this galaxy. one nearest probably most studied Seyfert 2 galaxy, becoming an excellent laboratory study interaction between black holes, jets they can produce medium which propagate. Our main result traces young...
The ESA Gaia mission, to be launched during 2013, will observe billions of objects, among which many galaxies, its scanning the sky. This provide a large space-based dataset with unprecedented spatial resolution. Because natural Galactic and Astrometric priority, Gaia's observational strategy was optimized for point sources. Nonetheless, it is expected that 10^6 sources extragalactic, portion them angularly small galaxies. Although mission designed sources, dedicated analysis raw data allow...
This paper presents preliminary results related to the impulse breakdown characteristics of XLPE-covered cables. Tests with standard lightning voltages (1.2/50 μs) applied a typical single-phase structure employed in compact distribution lines used Brazil were performed. Results terms voltage, time and pinhole location are presented.
A kinematical analysis applied to a sample of galaxy clusters indicates that the differences between velocity distribution elliptical and spiral galaxies are associated with shape their orbit families. The orbital anisotropies present on each morphological population could be measured use parameter which is ratio radial tangential dispersions, can recovered through observed line-of-sight distribution. When Gaussian assumed, having different dispersions along directions, we conclude orbits in...