3,346 research outputs found
A comprehensive classification of galaxies in the SDSS: How to tell true from fake AGN?
We use the W_Ha versus [NII]/Ha (WHAN) diagram to provide a comprehensive
emission-line classification of SDSS galaxies. This classification is able to
cope with the large population of weak line galaxies that do not appear in
traditional diagrams due to a lack of some of the diagnostic lines. A further
advantage of the WHAN diagram is to allow the differentiation between two very
distinct classes that overlap in the LINER region of traditional diagnostic
diagrams. These are galaxies hosting a weakly active nucleus (wAGN) and
"retired galaxies" (RGs), i.e. galaxies that have stopped forming stars and are
ionized by their hot evolved low-mass stars. A useful criterion to distinguish
true from fake AGN (i.e. the RGs) is the ratio (\xi) of the
extinction-corrected L_Ha with respect to the Ha luminosity expected from
photoionization by stellar populations older than 100 Myr. This ratio follows a
markedly bimodal distribution, with a \xi >> 1 population composed by systems
undergoing star-formation and/or nuclear activity, and a peak at \xi ~ 1
corresponding to the prediction of the RG model. We base our classification
scheme on the equivalent width of Ha, an excellent observational proxy for \xi.
Based on the bimodal distribution of W_Ha, we set the division between wAGN and
RGs at W_Ha = 3 A. Five classes of galaxies are identified within the WHAN
diagram: (a) Pure star forming galaxies: log [NII]/Ha 3 A.
(b) Strong AGN (i.e., Seyferts): log [NII]/Ha > -0.4 and W_Ha > 6 A. (c) Weak
AGN: log [NII]/Ha > -0.4 and W_Ha between 3 and 6 A. (d) RGs: W_Ha < 3 A. (e)
Passive galaxies (actually, line-less galaxies): W_Ha and W_[NII] < 0.5 A. A
comparative analysis of star formation histories and of other properties in
these different classes of galaxies corroborates our proposed differentiation
between RGs and weak AGN in the LINER-like family. (Abridged)Comment: Accepted for publication in MNRA
The many faces of LINER-like galaxies: a WISE view
We use the SDSS and WISE surveys to investigate the real nature of galaxies
defined as LINERs in the BPT diagram. After establishing a mid-infrared colour
W2-W3 = 2.5 as the optimal separator between galaxies with and without star
formation, we investigate the loci of different galaxy classes in the W_{Ha}
versus W2-W3 space. We find that: (1) A large fraction of LINER-like galaxies
are emission-line retired galaxies, i.e galaxies which have stopped forming
stars and are powered by hot low-mass evolved stars (HOLMES). Their W2-W3
colours show no sign of star formation and their Ha equivalent widths, W_{Ha},
are consistent with ionization by their old stellar populations. (2) Another
important fraction have W2-W3 indicative of star formation. This includes
objects located in the supposedly `pure AGN' zone of the BPT diagram. (3) A
smaller fraction of LINER-like galaxies have no trace of star formation from
W2-W3 and a high W_{Ha}, pointing to the presence of an AGN. (4) Finally, a few
LINERs tagged as retired by their W_{Ha} but with W2-W3 values indicative of
star formation are late-type galaxies whose SDSS spectra cover only the old
`retired' bulge. This reinforces the view that LINER-like galaxies are a mixed
bag of objects involving different physical phenomena and observational effects
thrusted into the same locus of the BPT diagram.Comment: Accepted for publication in MNRAS; 9 pages, 6 figure
Estratégias do educador para a gestão do comportamento.
Relatório apresentado para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Educação Pré Pré-Escolar
Semi-empirical analysis of Sloan Digital Sky Survey galaxies III. How to distinguish AGN hosts
We consider the techniques to distinguish normal star forming (NSF) galaxies
and active galactic nuclei (AGN) hosts using optical spectra. The observational
data base is a set of 20000 galaxies extracted from the Sloan Digital Sky
Survey, for which we have determined the emission line intensities after
subtracting the stellar continuum obtained from spectral synthesis. Our
analysis is based on photoionization models computed using the stellar ionizing
radiation predicted by Starburst 99 and, for the AGNs, a broken power-law
spectrum. We explain why, among the four classical emission line diagnostic
diagrams, the [OIII]/Hb vs [NII]/Ha one works best. We show however, that none
of these diagrams is efficient in detecting AGNs in metal poor galaxies, should
such cases exist. We propose a new divisory line between ``pure'' NSF galaxies
and AGN hosts. We also show that a classification into NSF and AGN galaxies
using only [NII]/Ha is feasible and useful. Finally, we propose a new
classification diagram, the DEW diagram, plotting D_n(4000) vs
max(EW[OII],EW[NeIII]). This diagram can be used with optical spectra for
galaxies with redshifts up to z = 1.3, meaning an important progress over
classifications proposed up to now. Since the DEW diagram requires only a small
range in wavelength, it can also be used at even larger redshifts in suitable
atmospheric windows. It also has the advantage of not requiring stellar
synthesis analysis to subtract the stars and of allowing one to see ALL the
galaxies in the same diagram, including passive galaxies.Comment: 14 pages, 9 figures, accepted for publication in MNRAS (replaced on
august 3, 2006, eqs 6 and 7 corrected
A media independent information service integration architecture for media independent handover
A present challenge in wireless networks is to provide mobility, regardless of the access technology in use, with guaranteed continuity of the service and transparency for the users. One approach to these seamless handovers is to prepare network access in advance, such as pre-authentication, before the mobile device actually physically connects to the desired network. This process requires that the mobile device can discover the parameters of the networks in their geographical area prior to connect to the candidate network. To address these issues, in this paper we propose an integration architecture for a Media Independent Information Service, where several networks elements collaborate in the discovery of information network, and mobile devices collect the desired neighboring network information with a query-response mechanism in two steps. A prototype has been implemented with of the shelf hardware, and several tests have been conducted. Results are better than the ones available in the literature, and network selection is performed in a short period of time.info:eu-repo/semantics/acceptedVersio
An alternative approach to aminodiols from Baylis-Hillman adducts: stereoselective synthesis of chloramphenicol, fluoramphenicol and thiamphenicol
We describe herein a new approach for the stereoselective synthesis of broad spectrum antibiotics from Baylis-Hillman adducts. The strategy is based on the preparation of an ene-carbamate directly from a Baylis-Hillman adduct using a Curtius rearrangement reaction. Stereoselective hydroboration furnished a mixture of diastereoisomeric aminoalcohols (syn and anti). After chromatographic separation, the syn diastereoisomer was directly transformed into the antibiotics.Descrevemos aqui uma nova interpretação para a espectros de banda larga da síntese estereosseletiva de antibióticos de adutos Baylis-Hillman. A estrategia é baseada na preparação de um eno-carbamato diretamente do aduto Baylis-Hillman, usando um rearranjo de Curtius. A hidroboração estereosseletiva fornece uma mistura de aminoalcools diasteroisomeros (syn e anti). Após separação cromatográfica, o diasteroisomero syn foi diretamente transformado no antibiótico.386396Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
Perfuração de Divertículo de Meckel num Adulto
Meckel's diverticulum is the commonest congenital anomaly of the gastrointestinal tract. Its complications have an extensive variety of clinical and imaging manifestations, extending from benign and indolent findings to acute life-threatening conditions. Complicated Meckel's diverticulum often constitutes a challenging diagnosis for both the clinician and the radiologist. Therefore, imaging techniques play an important role in this condition in evaluating its complications, determining decision making. We describe a case of a 49-year-old man suffering from right abdominal pain with fever and constipation, during the past 5 days. Laboratory data revealed C-reactive protein of 306 mg/L and leukocytosis. Contrast-enhanced CT features were highly suggestive of perforated Meckel's diverticulum. The purpose of this article is to emphasize that besides its rarity, Meckel's diverticulum complications can occur in adult patients.info:eu-repo/semantics/publishedVersio
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