Microwave and radio emission of dusty star-forming galaxies: Implication for the cosmic radio background

We use the most up-to-date cosmological evolution models of star-forming (SF) galaxies and radio sources to compute the extragalactic number counts and the cosmic background from 408MHz to 12THz. The model of SF galaxies reproduces the constraints obtained by Spitzer, Herschel, and ground-based submm/mm experiments: number counts, redshift distribution of galaxies, cosmic background intensity and anisotropies. The template SEDs of this model are extrapolated to the radio adding synchrotron, free-free, and spinning dust emissions. To fix the synchrotron intensity, we use the IR/radio flux ratio, q70, and a spectral index beta=-3. For a constant q70, our model added to the AGN contribution provides a good fit to the number counts from 12THz to 408MHz and to the CIB. Spinning dust accounts for up to 20% of the cosmic microwave background produced by SF galaxies, but for less than 10% of the total background when AGN are included. The SF galaxies account for 77.5% of the number counts at 1.4GHz for a flux of 1e-4Jy. However, the model does not explain the CRB measured with the ARCADE2 experiment. Considering the case when q70 decreases strongly with redshift, this still does not explain the ARCADE2 results. It also yields to an overestimate of the low-flux number counts in the radio. Thus, we rule out a steep variation of q70 with redshift at least for z<3.5. Adding a population of faint SF galaxies at high redshift (Lir<1e11Lsun and 4<z<6), which would reproduce the ARCADE2 results, leads to predictions of the CIB much higher than what is observed, ruling out this as the explanation for the ARCADE2 results. Considering our findings and previous studies, we conclude that if the radio emission measured by ARCADE2 is astrophysical in origin, it has to originate in the Galaxy or in a new kind of radio sources (with no mid- to far-IR counterparts) or emission mechanism still to be discovered.Comment: accepted for publication by A&A, modification of one citatio

Comments on the paper "The initial conditions of isolated star formation - VI. SCUBA mapping of prestellar cores" (Kirk et al. 2005)

In their survey paper of prestellar cores with SCUBA, Kirk et al. (2005) have discarded two of our papers on L183 (Pagani et al. 2003, 2004). However these papers bring two important pieces of information that they cannot ignore. Namely, the real structure of L183 and the very poor correlation between submillimeter and far infrared (FIR) dust emission beyond \Avb $\approx$ 15 mag. Making the erroneous assumption that it is the same dust that we are seeing in emission at both 200 and 850 $\mu$m, they derive constant temperatures which are only approximate, and column densities which are too low. In fact dust temperatures do decrease inside dark clouds and the FIR emission is only tracing the outer parts of the dark clouds (Pagani et al. 2004

Dissecting the high-z interstellar medium through intensity mapping cross-correlations

We explore the detection, with upcoming spectroscopic surveys, of three-dimensional power spectra of emission line fluctuations produced in different phases of the Interstellar Medium (ISM) by ionized carbon, ionized nitrogen and neutral oxygen at redshift z>4. The emission line [CII] from ionized carbon at 157.7 micron, and multiple emission lines from carbon monoxide, are the main targets of planned ground-based surveys, and an important foreground for future space-based surveys like the Primordial Inflation Explorer (PIXIE). However, the oxygen [OI] (145.5 micron) line, and the nitrogen [NII] (121.9 micron and 205.2 micron) lines, might be detected in correlation with [CII] with reasonable signal-to-noise ratio (SNR). These lines are important coolants of both the neutral and the ionized medium, and probe multiple phases of the ISM. We compute predictions of the three-dimensional power spectra for two surveys designed to target the [CII] line, showing that they have the required sensitivity to detect cross-power spectra with the [OI] line, and the [NII] lines with sufficient SNR. The importance of cross-correlating multiple lines is twofold. On the one hand, we will have multiple probes of the different phases of the ISM, which is key to understand the interplay between energetic sources, the gas and dust at high redshift. This kind of studies will be useful for a next-generation space observatory such as the NASA Far-IR Surveyor. On the other end, emission lines from external galaxies are an important foreground when measuring spectral distortions of the Cosmic Microwave Background spectrum with future space-based experiments like PIXIE; measuring fluctuations in the intensity mapping regime will help constraining the mean amplitude of these lines, and will allow us to better handle this important foreground.Comment: 13 pages, 2 table, 7 figures, Accepted for publication in Ap

LES RÉSEAUX NÉOLITHIQUES: QUELQUES RÉFLEXIONS PRÉALABLES

La notion de "réseau" néolithique met en jeu des processus complexes, ce terme impliquant plusieurs "échelles" de circulation: réseaux internes au sein d'ensembles culturels homogènes, réseaux supra-culturels transgressant divers ensembles. Au-delà de ces constants jouant autour de la notion de frontière, se pose la question des phénomènes sociaux qui sous-tendent la propagation d'objects: cadeaux, règles de réciprocité, nécessités économiques, diffusions à sens unique ou multidirecionnel, mouvements d'individus ou de groupes, etc. S'agissant de productions matérielles, s'ensuivent diverses interrogations: qui acquiert la matière? qui produit? qui diffuse? qui consomme? qui abandonne? Si les réseaux "materiéls" sont les plus accesibles à la visibilité des archéologues, qu'en est-il des circulations de personnes et, au-delà, des propagations d'idées engendrant des parallélismes dans les comportaments, les organitzacions sociales, l'ideologie? Derri`re le terme réseau (network) se cachent de multiples facters à l'oevre. On doit s'interroger aussi sur lés éventuelles résistances aux circulations d'objects ou d'idées par contre-production de référents identidaires. Enfin les référents identitaires. Enfin les réseaux que l'on observe sont-ils uniquement le fruit d'échanges pacifiques

A dynamical transition from atomic to molecular intermediate-velocity clouds

Towards the high galactic latitude sky, the far-infrared (FIR) intensity is tightly correlated to the total hydrogen column density which is made up of atomic (HI) and molecular hydrogen (H$_{2})$. Above a certain column density threshold, atomic hydrogen turns molecular. We analyse gas and dust properties of intermediate-velocity clouds (IVCs) in the lower galactic halo to explore their transition from the atomic to the molecular phase. Driven by observations, we investigate the physical processes that transform a purely atomic IVC into a molecular one. Data from the Effelsberg-Bonn HI-Survey (EBHIS) are correlated to FIR wavebands of the Planck satellite and IRIS. Modified black-body emission spectra are fitted to deduce dust optical depths and grain temperatures. We remove the contribution of atomic hydrogen to the FIR intensity to estimate molecular hydrogen column densities. Two IVCs show different FIR properties, despite their similarity in HI, such as narrow spectral lines and large column densities. One FIR bright IVC is associated with H$_{2}$, confirmed by $^{12}$CO $(1\rightarrow0)$ emission; the other IVC is FIR dim and shows no FIR excess, which indicates the absence of molecular hydrogen. We propose that the FIR dim and bright IVCs probe the transition between the atomic and molecular gas phase. Triggered by dynamical processes, this transition happens during the descent of IVCs onto the galactic disk. The most natural driver is ram pressure exerted onto the cloud by the increasing halo density. Because of the enhanced pressure, the formation timescale of H$_{2}$ is reduced, allowing the formation of large amounts of H$_{2}$ within a few Myr.Comment: 13 pages, 14 figures, accepted for publication by A&

Implementing a Culturally Sensitive Intervention for Haitian Patients Non-Adhering to Hypertensive Medications

Background: The pervasiveness of hypertension (HTN), morbidity, and mortality in Haitians immigrants are frightening. Nonadherence with hypertensive medications, disease management, lifestyle modifications, and cultural and spiritual beliefs, including prayer; faith healing; use of herbal teas; and a diet that is deficient in potassium, rich in sodium, high in fat, cholesterol, and carbohydrates result in increased prevalence of HTN and disability in the Haitian community. Purpose: The purpose of this quality improvement project was to examine the existing system for adherence to hypertensive medications, standardized clinical practice guidelines, identify patients at risk for nonadherence to hypertensive medications, disease management, medical follow-up, and incorporate standardized clinical guidelines into existing medical practice at a primary care office. Theoretical Framework: Theory of transnationalism was used. The transnationalism theoretical framework presents the impact of migration and transnational activities on the health of immigrants. Methods: The mixed model research with exploratory design was used. Results: The implementation of the resource guide was effective as evidenced by improved blood pressure readings and increase adherence to hypertensive medications as well as follow-up appointments. Conclusion: The prevalence of HTN in Haitian immigrants necessitate a different approach to health care delivery. Health care providers need to be aware of Haitian culture to deliver culturally competent care to improve health outcomes in Haitian immigrants

Cross-correlation of cosmic far-infrared background anisotropies with large scale structures

We measure the cross-power spectra between luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS)-III Data Release Eight (DR8) and cosmic infrared background (CIB) anisotropies from Planck and data from the Improved Reprocessing (IRIS) of the Infrared Astronomical Satellite (IRAS) at 353, 545, 857, and 3000 GHz, corresponding to 850, 550, 350 and 100 micron, respectively, in the multipole range 100<l<1000. Using approximately 6.5 10^5 photometrically determined LRGs in 7760 deg^2 of the northern hemisphere in the redshift range 0.45 < z < 0.65, we model the far-infrared background (FIRB) anisotropies with an extended version of the halo model. With these methods, we confirm the basic picture obtained from recent analyses of FIRB anisotropies with Herschel and Planck, that the most efficient halo mass at hosting star forming galaxies is log(M_ eff/M_\odot)=12.84+/-0.15. We estimate the percentage of FIRB anisotropies correlated with LRGs as approximately 11.8 %, 3.9 %, 1.8 %, and 1.0 % of the total at 3000, 857, 545, and 353 GHz, respectively. At redshift z~0.55, the bias of FIRB galaxies with respect to the dark matter density field has the value b_{FIRB}~1.45, and the mean dust temperature of FIRB galaxies is T_d=26 K. Finally, we discuss the impact of present and upcoming cross-correlations with far-infrared background anisotropies on the determination of the global star formation history and the link between galaxies and dark matter.Comment: 9 pages, 6 figures, accepted for publication in A&

Produção de adsorventes à base de resíduos para a remoção de fármacos da água: ativação química e modificação

The sustainable development of society implies the adoption of strategies related to waste management and valorization (in a circular economy perspective) and to effluent treatment (namely for the removal of pharmaceuticals from water). Being adsorption by activated carbon (AC) a well-established method for water treatment, this work focuses on the production of AC using residues, namely sludge from pulp and paper industry, for the removal of pharmaceuticals from water. This approach aims to foster an integrated solution for the two environmental issues involved in this work. Primary pulp and paper mill sludge (PS) showed a great potential to produce carbon-based adsorbents, relatively to biological sludge (BS). Through the use of PS and a production process involving chemical activation and pyrolysis, it was possible to produce AC in both powdered and granular (using a binder agent) forms, with high surface areas (SBET) (similar to those of commercial AC with the same granulometry). The produced powdered AC presented, in batch adsorption systems, adsorption capacities for the pharmaceuticals carbamazepine (CBZ), sulfamethoxazole (SMX) and paroxetine (PAR), in the same magnitude of commercial AC. However, when applied in wastewater matrix, variations in the adsorption capacity of the produced AC for the studied pharmaceutical was observed, namely in the case of SMX, which decreased, and PAR, that increased. The produced granular AC showed, in batch adsorption systems, lower adsorption capacity for the three pharmaceuticals CBZ, SMX, and PAR, than the commercial granular AC used as reference. Also, in this case, a reduction in the adsorption capacity for CBZ and SMX was observed for wastewater matrices. In fixed-bed column studies (continuous mode) the produced granular AC presented a higher breakthrough volume and adsorption capacity for CBZ for the lower flow-rate. Also, it was observed a reduction of the adsorption capacity with the increase of the complexity of the aqueous matrix (distilled water > wastewater > multicomponente solutions – with the three pharmaceuticals – in wastewater). The application of different functionalization methods to the powdered AC surface showed to be an interesting approach, evidencing an increase in the selectivity of some functionalized AC for some of the pharmaceuticals under study, despite the general reduction in their SBET. Concluding, this work demonstrates the potential of PS from pulp and paper mill industry to produce alternative AC, particularly in the powdered form, to be applied in the removal of pharmaceuticals from water.O desenvolvimento sustentável da sociedade implica a adoção de estratégias ligadas à gestão dos resíduos e sua valorização (numa perspetiva de economia circular) e ao tratamento de efluentes (nomeadamente, para a remoção de fármacos da água). Sendo o processo de adsorção por carvão ativado (CA) um método bem estabelecido para o tratamento de águas, este trabalho incide sobre a produção de CA a partir de resíduos, nomeadamente lamas da indústria da pasta e do papel, para a remoção de fármacos da água. Esta abordagem pretende proporcionar uma solução integrada nos dois desafios ambientais anteriormente referidos. Comparativamente com as lamas biológicas (LB), as lamas primárias (LP) da indústria da pasta e do papel, mostraram ter um grande potencial para a produção de adsorventes à base de carvão. A partir de LP, e usando um processo de ativação química e pirólise, foi possível produzir CA, quer na forma de pó, quer na forma granular (usando um agente aglomerante) com elevadas áreas superficiais (SBET) (comparáveis às de CA comerciais da mesma granulometria). Os CA produzidos em pó apresentaram, em sistemas descontínuos de adsorção, capacidades de adsorção para os fármacos carbamazepina (CBZ), sulfametoxazol (SMX) e paroxetina (PAR), da mesma ordem de grandeza que os CA comerciais. Contudo, quando aplicados em matrizes de efluente real, observam-se variações na capacidade de adsorção dos CA produzidos para os fármacos em estudo, principalmente no caso do SMX, que diminuiu, e da PAR, que aumentou. O CA granular produzido apresentou, em sistemas descontínuos de adsorção, menor capacidade de adsorção para os três fármacos CBZ, SMX e PAR, do que o CA granular comercial de referência. Também neste caso, se verificou uma redução da capacidade de adsorção da CBZ e do SMX em matrizes de efluente real. Estudos realizados em colunas de leito-fixo (modo contínuo) mostraram que o CA granular produzido apresentou maior volume de rutura e maior capacidade de adsorção da CBZ para o menor fluxo. Verificou-se, ainda, a redução da capacidade de adsorção com o aumento da complexidade da matriz aquosa (água destilada > efluente real > soluções multicomponente - com os três fármacos - em efluente). A aplicação de diferentes metodologias de modificação ou funcionalização da superfície dos CA em pó mostrou ser uma abordagem interessante, observando-se um aumento de seletividade de alguns CA funcionalizados para alguns dos fármacos em estudo, apesar da redução geral da SBET destes. Em suma, este trabalho demonstra o potencial das LP da indústria papeleira para a produção de CA alternativos aos CA comerciais, em particular para a formulação em pó, e para a sua aplicação na remoção de fármacos das águas.Programa Doutoral em Químic

Pont de Roque-Haute et le cadre chronologique du Néolithique ancien du Sud de la France.

Les datations radiocarbone du gisement languedocien de Pont de Roque-Haute sont replacées dans le contexte du 6e millénaire de Méditerranée occidentale