A5018564617- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Laser-Plasma Interactions and Diagnostics
- Astrophysics and Cosmic Phenomena
- Remote Sensing in Agriculture
- History and Developments in Astronomy
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Atomic and Molecular Physics
- Soybean genetics and cultivation
- Historical Astronomy and Related Studies
- Analytical Chemistry and Sensors
- Historical and Architectural Studies
- Health, Education, and Aging
- Light effects on plants
Heidelberg University
2024
Universidade de São Paulo
2023-2024
Museu de Astronomia e Ciências Afins
2024
Universidade do Vale do Paraíba
2014-2023
Universidade Federal do Rio Grande do Sul
2007-2023
Técnicas Reunidas (Spain)
2023
AVM Faculdade Integrada
2023
Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde
2023
Southern Astrophysical Research Telescope
2008
University of Cologne
2007
view Abstract Citations (171) References (98) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Infrared Imaging and Spectroscopy of NGC 7469 Genzel, R. ; Weitzel, L. Tacconi-Garman, E. Blietz, M. Cameron, Krabbe, A. Lutz, D. Sternberg, As part an extensive study the infrared properties luminous galactic nuclei we report here subarcsecond-resolution near-infrared imaging spectroscopy nucleus Seyfert 1 galaxy 7469. Our measurements elucidate for first time...
view Abstract Citations (126) References (82) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Multiwavelength Study of 30 Doradus: The Interstellar Medium in a Low-Metallicity Galaxy Poglitsch, A. ; Krabbe, Madden, S. C. Nikola, T. Geis, N. Johansson, L. E. B. Stacey, G. J. Sternberg, We report maps the 158 microns [C II] fine-structure line, 63 and 146 [O I] lines, 2.2 H I Brγ 2.1 H2 1-0 S(1) ro-vibrational 2.6 mm CO (1-0) rotational line toward Doradus...
view Abstract Citations (137) References (130) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Near-Infrared Line Imaging of NGC 6240: Collision Shock and Nuclear Starburst van der Werf, Paul P. ; Genzel, R. Krabbe, A. Blietz, M. Lutz, D. Drapatz, S. Ward, Martin J. Forbes, Duncan Images the merging luminous IR galaxy 6240 in H_2_ ν = 1 - 0 S(1)2.12 micron line [Fe II] 1.64 are presented, together with velocity-resolved slit spectra these lines. The images...
We analyse the reliability of oxygen abundances and ionization parameters obtained from a number diagnostic diagrams.To do this, we used literature to compile observational emission-line intensities 446 star-forming regions whose O/H were determined by direct estimation electron temperature.These compiled compared with values calculated in this work using various diagrams combination results grid photoionization models.We found that theIII] gave close those temperature, differences about...
We analysed the evolution of metallicity gas with redshift for a sample AGNs in very wide range (0 < z 4) using ultraviolet emission lines from narrow-line regions (NLRs) and photoionization models. The new index C43 = log[(C iv+C iii])/He ii] is suggested as indicator AGNs. Based on this indicator, we confirmed no NLRs pointed out by previous works. found that shows similar than one predicted cosmic semi-analytic models galaxy formation set within cold dark matter merging hierarchy (for ≲...
We present 0.1" resolution near-infrared integral field spectroscopy of Halpha in a z=1.4781 star forming galaxy, Q2343-BM133. These observations were obtained with OSIRIS (OH Suppressing Infra-Red Imaging Spectrograph) using the W.M. Keck Observatory Laser Guide Star Adaptive Optics system. emission is resolved over 0.8" (6.8 kpc) x 0.5" (4.3 region spatial resolution. find global flux 4.2+/-0.6x10^{-16} ergs s^{-1} cm^{-2}, and detect spatially velocity gradient ~134 km across galaxy...
We examine the relation between oxygen abundances in narrow-line regions (NLRs) of active galactic nuclei (AGNs) estimated from optical emission lines through strong-line method (the theoretical calibration Storchi-Bergmann et al.(1998)), via direct Te-method, and central intersect host galaxies determined radial abundance gradients. found that Te-method underestimates by up to ~2 dex (with average value ~0.8 dex) compared derived method. This confirms existence so-called "temperature...
We present a semi-empirical calibration between the metallicity ($Z$) of Seyfert 2 Active Galactic Nuclei and $N2$=log([N II]$\lambda$6584/H$\alpha$) emission-line intensity ratio. This was derived through [O III]$\lambda$5007/[O II]$\lambda$3727 versus $N2$ diagram containing observational data photoionization model results obtained with Cloudy code. The sample consists 463 confirmed nuclei (redshift $z < 0.4$) taken from Sloan Digital Sky Survey DR7 dataset. $Z$-$N2$ relation is valid for...
We investigate the discrepancy between oxygen abundance estimations for narrow-line regions (NLRs) of Active Galactic Nuclei (AGNs) type Seyfert 2 derived by using direct electron temperature (Te-method) and those photoionization models. In view this, observational emission-line ratios in optical range (3000 < \lambda(\AA) 7000) nuclei compiled from literature were reproduced detailed models built with Cloudy code. find that discrepancies are mainly due to inappropriate use relations...
We present oxygen abundances relative to hydrogen (O/H) in the narrow line regions (NLRs) gas phases of Seyferts 1 (Sy 1s) and 2 2s) Active Galactic Nuclei (AGNs). used fluxes optical emission intensities [$3\,500<\lambda($\AA$)<7\,000$] 561 Seyfert nuclei local universe ($z\lesssim0.31$) from second catalog data release (DR2) BAT AGN Spectroscopic Survey, which focuses on \textit{Swift}-BAT hard X-ray ($\gtrsim10$ keV) detected AGNs. derived O/H lines via strong-line methods. find that are...
view Abstract Citations (78) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Near-Infrared Spectroscopic Imaging of the Circumnuclear Environment NGC 1068 Blietz, M. ; Cameron, Drapatz, S. Genzel, R. Krabbe, A. van der Werf, P. Sternberg, Ward, We report <= 1" resolution imaging 1.6435 micron [Fe II] and 2.1212 H_2_ ν = 1-0S(1) lines toward nucleus Seyfert 2 galaxy 1068. Our observations suggest that near-infrared emission, as well radio...
We compare the oxygen abundance (O/H) of Narrow Line Regions (NLRs) Seyfert 2 AGNs obtained through strong-line methods and from direct measurements electron temperature (Te-method). The aim this study is to explore effects use distinct on range metallicity mass-metallicity relation at low redshifts (z < 0.4). used Sloan Digital Sky Survey (SDSS) NASA/IPAC Extragalactic Database (NED) selected optical (3000 A 7000) emission line intensities 463 confirmed AGNs. NLRs were estimated using...
We present maps for the electron temperature in inner kpc of three luminous Seyfert galaxies: Mrk 79, 348, and 607 obtained from Gemini GMOS-IFU observations at spatial resolutions 110-280 pc. study distributions active galaxies find temperatures varying range 8000 to >30000 K. Shocks due gas outflows play an important role observed 79 while standard photoionization models reproduce derived values 607. In we direct evidence shock-ionization with overall orientation orthogonal ionization...
Studying the interstellar medium in nearby starbursts is essential for understanding physical mechanisms driving these objects, thought to resemble young star-forming galaxies. This study aims analyze properties of first spatially-resolved multi-wavelength SED an extragalactic source, spanning six decades frequency (from near-UV cm wavelengths) at angular resolution 3$^{\prime\prime}$ (51 pc distance NGC,253). We focus on central molecular zone (CMZ) NGC,253, which contains giant clouds...
Multi-band photometric surveys provide a straightforward way to discover and classify astrophysical objects systematically, enabling the study of large number targets at relatively low cost. Here we introduce an alternative approach select Accreting White Dwarf (AWD) candidates following their spectral energy distribution, entirely supported by twelve bands Southern Photometric Local Universe Survey (S-PLUS). The method was validated with optical spectroscopic follow-up Gemini South...
The metal content of a galaxy's interstellar medium reflects the interplay between different evolutionary processes such as feedback from massive stars and accretion gas intergalactic medium. Despite expected abundance low-luminosity galaxies, low-mass low-metallicity regime remains relatively understudied. Since properties their resemble those early identifying objects in Local Universe is crucial to understand stages galaxy evolution. We used DR3 catalog Southern Photometric Survey...
Abstract Multiband photometric surveys provide a straightforward way to discover and classify astrophysical objects systematically, enabling the study of large number targets at relatively low cost. Here we introduce an alternative approach select accreting white dwarf (AWD) candidates following their spectral energy distribution, entirely supported by twelve bands Southern Photometric Local Universe Survey (S-PLUS). The method was validated with optical spectroscopic follow-up Gemini South...
Massive star formation is associated with energetic processes that may influence the physics and chemistry of parental molecular clouds impact galaxy evolution. The high-mass protostar DR21 Main in Cygnus X possesses one largest most luminous outflows ever detected Galaxy, but origin its structure driving mechanisms are still debated. Our aim to spatially resolve far-infrared line emission from investigate gas physical conditions, energetics, current mass loss rates along outflow....
We present an observational study about the impacts of interactions in electron density \ion{H}{ii} regions located 7 systems interacting galaxies. The data consist long-slit spectra range 4400-7300 A, obtained with Gemini Multi-Object Spectrograph at South (GMOS). was determined using ratio emission lines [SII]6716/6731. Our results indicate that estimates HII from our sample galaxies are systematically higher than those derived for isolated mean values $N_{\rm e}=24-532$\,$ \rm cm^{-3}$,...
In this paper, we derive oxygen abundance gradients from H ii regions located in 11 galaxies eight systems of close pairs. Long-slit spectra the range 4400–7300 Å were obtained with Gemini Multi-Object Spectrograph at South (GMOS-S). Spatial profiles gaseous phase along galaxy discs using calibrations based on strong emission lines (N2 and O3N2). We found to be significantly flatter for all studied than those typical isolated spiral galaxies. Four objects our sample, AM 1219A, 1256B, 2030A...
In the present work we used a grid of photoionization models combined with stellar population synthesis to derive reliable Ionization Correction Factors (ICFs) for sulphur in star-forming regions. These cover large range nebular parameters and yielding ionic abundances consonance those derived through optical infrared observational data From our theoretical ICFs, suggested an {\alpha} value 3.27 classical Stasinska formulae. We compared total abundance gas phase sample objects by using...
ABSTRACT For the first time, helium abundance relative to hydrogen (He/H), which relied on direct measurements of electron temperature, has been derived in narrow line regions (NLRs) from a local sample Seyfert 2 nuclei. In view this, optical emission intensities [3000 &lt; λ(Å) 7000] 65 nuclei (z 0.2), taken Sloan Digital Sky Survey Data Release 15 and additional compilation literature, were considered. We used photoionization model grid derive an Ionization Correction Factor (ICF) for...
For the first time, sulphur abundance relative to hydrogen (S/H) in Narrow Line Regions of a sample Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation electron temperature. emission line intensities from SDSS DR17 [in wavelength range 3000 < $\lambda$ 9100] and literature for 45 nearby ($z$ 0.08) Sy 2s were considered. Our estimates indicate that have similar temperatures gas region where most S+ ions are located comparison with star-forming regions (SFs). However, present...
ABSTRACT The Fornax galaxy cluster is the richest nearby (D ∼ 20 Mpc) association in southern sky. As such, it provides a wealth of opportunities to elucidate on processes where environment holds key role transforming galaxies. Although has been focus many studies, never explored with contiguous homogeneous wide-field imaging 12 photometric narrow and broad bands like those provided by Southern Photometric Local Universe Survey (S-PLUS). In this paper, we present S-PLUS Project (S+FP) that...