988 results on '"Dumas, G."'
Search Results
2. Jets, Arcs and Shocks: NGC 5195 at radio wavelengths
- Author
-
Rampadarath, H., Soria, R., Urquhart, R., Argo, M. K., Brightman, M., Lacey, C. K., Schlegel, E. M., Beswick, R. J., Baldi, R. D., Muxlow, T. W. B., McHardy, I. M., Williams, D. R. A., and Dumas, G.
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We studied the nearby, interacting galaxy NGC 5195 (M51b) in the radio, optical and X-ray bands. We mapped the extended, low-surface-brightness features of its radio-continuum emission; determined the energy content of its complex structure of shock-ionized gas; constrained the current activity level of its supermassive nuclear black hole. In particular, we combined data from the European Very Long Baseline Interferometry Network (~1-pc scale), from our new e-MERLIN observations (~10-pc scale), and from the Very Large Array (~100-1000-pc scale), to obtain a global picture of energy injection in this galaxy. We put an upper limit to the luminosity of the (undetected) flat-spectrum radio core. We find steep-spectrum, extended emission within 10 pc of the nuclear position, consistent with optically-thin synchrotron emission from nuclear star formation or from an outflow powered by an active galactic nucleus (AGN). A linear spur of radio emission juts out of the nuclear source towards the kpc-scale arcs (detected in radio, Halpha and X-ray bands). From the size, shock velocity, and Balmer line luminosity of the kpc-scale bubble, we estimate that it was inflated by a long-term-average mechanical power ~3-6 x 10^{41} erg/s over the last 3-6 Myr. This is an order of magnitude more power than can be provided by the current level of star formation, and by the current accretion power of the supermassive black hole. We argue that a jet-inflated bubble scenario associated with previous episodes of AGN activity is the most likely explanation for the kpc-scale structures., Comment: 16 pages, 7 figures. Accepted by MNRAS on 2017 Feb 12
- Published
- 2018
- Full Text
- View/download PDF
3. The Radio Spectral Energy Distribution and Star Formation Rate Calibration in Galaxies
- Author
-
Tabatabaei, F. S., Schinnerer, E., Krause, M., Dumas, G., Meidt, S., Beck, R., Damas-Segovia, A., Murphy, E. J., Mulcahy, D. D., Groves, B., Bolatto, A., Dale, D., Galametz, M., Sandstrom, K., Boquien, M., Calzetti, D., Kennicutt, R. C., Hunt, L. K., De Looze, I., and Pellegrini, E. W.
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We study the spectral energy distribution (SED) of the radio continuum emission from the KINGFISH sample of nearby galaxies to understand the energetics and origin of this emission. Effelsberg multi-wavelength observations at 1.4GHz, 4.8GHz, 8.5GHz, and 10.5GHz combined with archive data allow us, for the first time, to determine the mid-radio continuum (1-10 GHz, MRC) bolometric luminosities and further present calibration relations vs. the monochromatic radio luminosities. The 1-10 GHz radio SED is fitted using a Bayesian Markov Chain Monte Carlo (MCMC) technique leading to measurements for the nonthermal spectral index and the thermal fraction f_th with mean values of alpha_nt=0.97+-0.16 (0.79+-0.15 for the total spectral index) and f_th= 10% +- 9% at 1.4 GHz. The MRC luminosity changes over ~3 orders of magnitude in the sample. The thermal emission is responsible for ~23% of the MRC on average. We also compare the extinction-corrected diagnostics of star formation rate with the thermal and nonthermal radio tracers and derive the first star formation calibration relations using the MRC radio luminosity. The nonthermal spectral index flattens with increasing star formation rate surface density, indicating the effect of the star formation feedback on the cosmic ray electron population in galaxies. Comparing the radio and IR SEDs, we find that the FIR-to-MRC ratio could decrease with star formation rate, due to the amplification of the magnetic fields in star forming regions. This particularly implies a decrease in the ratio at high redshifts, where mostly luminous/star forming galaxies are detected., Comment: 29 pages, 15 figures, accepted for publication in Astrophysical Journal
- Published
- 2016
- Full Text
- View/download PDF
4. Gravitational torques imply molecular gas inflow towards the nucleus of M51
- Author
-
Querejeta, M., Meidt, S., Schinnerer, E., García-Burillo, S., Dobbs, C., Colombo, D., Dumas, G., Hughes, A., Kramer, C., Leroy, A., Pety, J., Schuster, K., and Thompson, T.
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
The transport of gas towards the centre of galaxies is critical for black hole feeding and, indirectly, it can control active galactic nucleus (AGN) feedback. We have quantified the molecular gas inflow in the central R<1kpc of M51 to be 1 Msun/yr, using a new gravitational torque map and the molecular gas traced by the PdBI Arcsecond Whirlpool Survey (PAWS). The nuclear stellar bar is responsible for this gas inflow. We have also used torque profiles to estimate the location of dynamical resonances, suggesting a corotation for the bar at R~20", and a corotation for the spiral at R~100". We demonstrate how important it is to correct 3.6um images for dust emission in order to compute gravitational torques, and we carefully examine further sources of uncertainty. Our observational measurement of gas inflow can be compared with nuclear molecular outflow rates and provide useful constraints for numerical simulations., Comment: 19 pages, 12 figures. Accepted by A&A
- Published
- 2015
- Full Text
- View/download PDF
5. Electro-clinical features in epileptic children with chromosome 15q duplication syndrome
- Author
-
Dangles, M.-T., Malan, V., Dumas, G., Romana, S., Raoul, O., Coste-Zeitoun, D., Soufflet, C., Vignolo-Diard, P., Bahi-Buisson, N., Barnérias, C., Chemaly, N., Desguerre, I., Gitiaux, C., Hully, M., Bourgeois, M., Guimier, A., Rio, M., Munnich, A., Nabbout, R., Kaminska, A., and Eisermann, M.
- Published
- 2021
- Full Text
- View/download PDF
6. Enhanced specialized metabolite, trichome density, and biosynthetic gene expression in Stevia rebaudiana (Bertoni) Bertoni plants inoculated with endophytic bacteria Enterobacter hormaechei
- Author
-
Dumas G. Oviedo-Pereira, Melina López-Meyer, Silvia Evangelista-Lozano, Luis G. Sarmiento-López, Gabriela Sepúlveda-Jiménez, and Mario Rodríguez-Monroy
- Subjects
Stevia rebaudiana ,Endophytic bacteria ,Trichomes ,Steviol glycosides ,Biosynthetic genes ,UDP-glycosyltransferases ,Medicine ,Biology (General) ,QH301-705.5 - Abstract
Stevia rebaudiana (Bertoni) Bertoni is a plant of economic interest in the food and pharmaceutical industries due its steviol glycosides (SG), which are rich in metabolites that are 300 times sweeter than sucrose. In addition, S. rebaudiana plants contain phenolic compounds and flavonoids with antioxidant activity. Endophytic bacteria promote the growth and development and modulate the metabolism of the host plant. However, little is known regarding the role of endophytic bacteria in the growth; synthesis of SG, flavonoids and phenolic compounds; and the relationship between trichome development and specialized metabolites in S. rebaudiana, which was the subject of this study. The 12 bacteria tested did not increase the growth of S. rebaudiana plants; however, the content of SG increased with inoculation with the bacteria Enterobacter hormaechei H2A3 and E. hormaechei H5A2. The SG content in leaves paralleled an increase in the density of glandular, short, and large trichome. The image analysis of S. rebaudiana leaves showed the presence of SG, phenolic compounds, and flavonoids principally in glandular and short trichomes. The increase in the transcript levels of the KO, KAH, UGT74G1, and UGT76G1 genes was related to the SG concentration in plants of S. rebaudiana inoculated with E. hormaechei H2A3 and E. hormaechei H5A2. In conclusion, inoculation with the stimulating endophytes E. hormaechei H2A3 and E. hormaechei H5A2 increased SG synthesis, flavonoid content and flavonoid accumulation in the trichomes of S. rebaudiana plants.
- Published
- 2022
- Full Text
- View/download PDF
7. An Overview of the 2014 ALMA Long Baseline Campaign
- Author
-
Partnership, ALMA, Fomalont, E. B., Vlahakis, C., Corder, S., Remijan, A., Barkats, D., Lucas, R., Hunter, T. R., Brogan, C. L., Asaki, Y., Matsushita, S., Dent, W. R. F., Hills, R. E., Phillips, N., Richards, A. M. S., Cox, P., Amestica, R., Broguiere, D., Cotton, W., Hales, A. S., Hiriart, R., Hirota, A., Hodge, J. A., Impellizzeri, C. M. V., Kern, J., Kneissl, R., Liuzzo, E., Marcelino, N., Marson, R., Mignano, A., Nakanishi, K., Nikolic, B., Perez, J. E., Pérez, L. M., Toledo, I., Aladro, R., Butler, B., Cortes, J., Cortes, P., Dhawan, V., Di Francesco, J., Espada, D., Galarza, F., Garcia-Appadoo, D., Guzman-Ramirez, L., Humphreys, E. M., Jung, T., Kameno, S., Laing, R. A., Leon, S., Mangum, J., Marconi, G., Nagai, H., Nyman, L. -A., Radiszcz, M., Rodón, J. A., Sawada, T., Takahashi, S., Tilanus, R. P. J., van Kempen, T., Vilaro, B. Vila, Watson, L. C., Wiklind, T., Gueth, F., Tatematsu, K., Wootten, A., Castro-Carrizo, A., Chapillon, E., Dumas, G., de Gregorio-Monsalvo, I., Francke, H., Gallardo, J., Garcia, J., Gonzalez, S., Hibbard, J. E., Hill, T., Kaminski, T., Karim, A., Krips, M., Kurono, Y., Lopez, C., Martin, S., Maud, L., Morales, F., Pietu, V., Plarre, K., Schieven, G., Testi, L., Videla, L., Villard, E., Whyborn, N., Zwaan, M. A., Alves, F., Andreani, P., Avison, A., Barta, M., Bedosti, F., Bendo, G. J., Bertoldi, F., Bethermin, M., Biggs, A., Boissier, J., Brand, J., Burkutean, S., Casasola, V., Conway, J., Cortese, L., Dabrowski, B., Davis, T. A., Trigo, M. Diaz, Fontani, F., Franco-Hernandez, R., Fuller, G., Madrid, R. Galvan, Giannetti, A., Ginsburg, A., Graves, S. F., Hatziminaoglou, E., Hogerheijde, M., Jachym, P., Serra, I. Jimenez, Karlicky, M., Klaasen, P., Kraus, M., Kunneriath, D., Lagos, C., Longmore, S., Leurini, S., Maercker, M., Magnelli, B., Vidal, I. Marti, Massardi, M., Maury, A., Muehle, S., Muller, S., Muxlow, T., O'Gorman, E., Paladino, R., Petry, D., Pineda, J., Randall, S., Richer, J. S., Rossetti, A., Rushton, A., Rygl, K., Monge, A. Sanchez, Schaaf, R., Schilke, P., Stanke, T., Schmalzl, M., Stoehr, F., Urban, S., van Kampen, E., Vlemmings, W., Wang, K., Wild, W., Yang, Y., Iguchi, S., Hasegawa, T., Saito, M., Inatani, J., Mizuno, N., Asayama, S., Kosugi, G., Morita, K. -I., Chiba, K., Kawashima, S., Okumura, S. K., Ohashi, N., Ogasawara, R., Sakamoto, S., Noguchi, T., Huang, Y. -D., Liu, S. -Y., Kemper, F., Koch, P. M., Chen, M. -T., Chikada, Y., Hiramatsu, M., Iono, D., Shimojo, M., Komugi, S., Kim, J., Lyo, A. -R., Muller, E., Herrera, C., Miura, R. E., Ueda, J., Chibueze, J., Su, Y. -N., Trejo-Cruz, A., Wang, K. -S., Kiuchi, H., Ukita, N., Sugimoto, M., Kawabe, R., Hayashi, M., Miyama, S., Ho, P. T. P., Kaifu, N., Ishiguro, M., Beasley, A. J., Bhatnagar, S., Braatz III, J. A., Brisbin, D. G., Brunetti, N., Carilli, C., Crossley, J. H., D'Addario, L., Meyer, J. L. Donovan, Emerson, D. T., Evans, A. S., Fisher, P., Golap, K., Griffith, D. M., Hale, A. E., Halstead, D., Hardy, E. J., Hatz, M. C., Holdaway, M., Indebetouw, R., Jewell, P. R., Kepley, A. A., Kim, D. -C., Lacy, M. D., Leroy, A. K., Liszt, H. S., Lonsdale, C. J., Matthews, B., McKinnon, M., Mason, B. S., Moellenbrock, G., Moullet, A., Myers, S. T., Ott, J., Peck, A. B., Pisano, J., Radford, S. J. E., Randolph, W. T., Venkata, U. Rao, Rawlings, M. G., Rosen, R., Schnee, S. L., Scott, K. S., Sharp, N. K., Sheth, K., Simon, R. S., Tsutsumi, T., and Wood, S. J.
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions of tens of milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up to ~15 km. To develop and test this capability, a Long Baseline Campaign (LBC) was carried out from September to late November 2014, culminating in end-to-end observations, calibrations, and imaging of selected Science Verification (SV) targets. This paper presents an overview of the campaign and its main results, including an investigation of the short-term coherence properties and systematic phase errors over the long baselines at the ALMA site, a summary of the SV targets and observations, and recommendations for science observing strategies at long baselines. Deep ALMA images of the quasar 3C138 at 97 and 241 GHz are also compared to VLA 43 GHz results, demonstrating an agreement at a level of a few percent. As a result of the extensive program of LBC testing, the highly successful SV imaging at long baselines achieved angular resolutions as fine as 19 mas at ~350 GHz. Observing with ALMA on baselines of up to 15 km is now possible, and opens up new parameter space for submm astronomy., Comment: 11 pages, 7 figures, 2 tables; accepted for publication in the Astrophysical Journal Letters; this version with small changes to affiliations
- Published
- 2015
- Full Text
- View/download PDF
8. ALMA Long Baseline Observations of the Strongly Lensed Submillimeter Galaxy HATLAS J090311.6+003906 at z=3.042
- Author
-
Partnership, ALMA, Vlahakis, C., Hunter, T. R., Hodge, J. A., Pérez, L. M., Andreani, P., Brogan, C. L., Cox, P., Martin, S., Zwaan, M., Matsushita, S., Dent, W. R. F., Impellizzeri, C. M. V., Fomalont, E. B., Asaki, Y., Barkats, D., Hills, R. E., Hirota, A., Kneissl, R., Liuzzo, E., Lucas, R., Marcelino, N., Nakanishi, K., Phillips, N., Richards, A. M. S., Toledo, I., Aladro, R., Broguiere, D., Cortes, J. R., Cortes, P. C., Espada, D., Galarza, F., Garcia-Appadoo, D., Guzman-Ramirez, L., Hales, A. S., Humphreys, E. M., Jung, T., Kameno, S., Laing, R. A., Leon, S., Marconi, G., Mignano, A., Nikolic, B., Nyman, L. -A., Radiszcz, M., Remijan, A., Rodón, J. A., Sawada, T., Takahashi, S., Tilanus, R. P. J., Vilaro, B. Vila, Watson, L. C., Wiklind, T., Ao, Y., Di Francesco, J., Hatsukade, B., Hatziminaoglou, E., Mangum, J., Matsuda, Y., van Kampen, E., Wootten, A., de Gregorio-Monsalvo, I., Dumas, G., Francke, H., Gallardo, J., Garcia, J., Gonzalez, S., Hill, T., Iono, D., Kaminski, T., Karim, A., Krips, M., Kurono, Y., Lonsdale, C., Lopez, C., Morales, F., Plarre, K., Videla, L., Villard, E., Hibbard, J. E., and Tatematsu, K.
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We present initial results of very high resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations of the $z$=3.042 gravitationally lensed galaxy HATLAS J090311.6+003906 (SDP.81). These observations were carried out using a very extended configuration as part of Science Verification for the 2014 ALMA Long Baseline Campaign, with baselines of up to 15 km. We present continuum imaging at 151, 236 and 290 GHz, at unprecedented angular resolutions as fine as 23 milliarcseconds (mas), corresponding to an un-magnified spatial scale of ~180 pc at z=3.042. The ALMA images clearly show two main gravitational arc components of an Einstein ring, with emission tracing a radius of ~1.5". We also present imaging of CO(10-9), CO(8-7), CO(5-4) and H2O line emission. The CO emission, at an angular resolution of ~170 mas, is found to broadly trace the gravitational arc structures but with differing morphologies between the CO transitions and compared to the dust continuum. Our detection of H2O line emission, using only the shortest baselines, provides the most resolved detection to date of thermal H2O emission in an extragalactic source. The ALMA continuum and spectral line fluxes are consistent with previous Plateau de Bure Interferometer and Submillimeter Array observations despite the impressive increase in angular resolution. Finally, we detect weak unresolved continuum emission from a position that is spatially coincident with the center of the lens, with a spectral index that is consistent with emission from the core of the foreground lensing galaxy., Comment: 9 pages, 5 figures and 3 tables, accepted for publication in the Astrophysical Journal Letters
- Published
- 2015
- Full Text
- View/download PDF
9. The skull vibration-induced nystagmus test: A useful vestibular screening test in children with hearing loss
- Author
-
Sinno, S., Perrin, P., Smith Abouchacra, K., and Dumas, G.
- Published
- 2020
- Full Text
- View/download PDF
10. Nystagmus induit par vibration : un test vestibulaire de dépistage utile chez l’enfant malentendant
- Author
-
Sinno, S., Perrin, P., Abouchacra, K. Smith, and Dumas, G.
- Published
- 2020
- Full Text
- View/download PDF
11. Fueling AGN II: Spatially Resolved Molecular Inflows and Outflows
- Author
-
Davies, R. I., Maciejewski, W., Hicks, E. K. S., Emsellem, E., Erwin, P., Burtscher, L., Dumas, G., Lin, M., Malkan, M. A., Mueller-Sanchez, F., de Xivry, G. Orban, Rosario, D. J., Schnorr-Mueller, A., and Tran, A.
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We analyse the 2-dimensional distribution and kinematics of the stars as well as molecular and ionised gas in the central few hundred parsecs of 5 active and 5 matched inactive galaxies. The equivalent widths of the Br-gamma line indicate there is no on-going star formation in their nuclei, although recent (terminated) starbursts are possible in the active galaxies. The stellar velocity fields show no signs of non-circular motions, while the 1-0S(1) H_2 kinematics exhibit significant deviations from simple circular rotation. In the active galaxies the H_2 kinematics reveal inflow and outflow superimposed on disk rotation. Steady-state circumnuclear inflow is seen in three AGN, and hydrodynamical models indicate it can be driven by a large scale bar. In three of the five AGN, molecular outflows are spatially resolved. The outflows are oriented such that they intersect, or have an edge close to, the disk - which may be the source of molecular gas in the outflow. The relatively low speeds imply the gas will fall back onto the disk; and with moderate outflow rates, they will have only a local impact on the host galaxy. H_2 was detected in two inactive galaxies. These exhibit chaotic circumnuclear dust morphologies and have molecular structures that are counter-rotating with respect to the main gas component, which could lead to gas inflow in the near future. In our sample, all four galaxies with chaotic dust morphology in the circumnuclear region exist in moderately dense groups with 10-15 members where accretion of stripped gas can easily occur., Comment: Accepted for publication in ApJ. 29 pages, including 18 figures
- Published
- 2014
- Full Text
- View/download PDF
12. Localized SiO emission triggered by the passage of the W51C SNR shock
- Author
-
Dumas, G., Vaupré, S., Ceccarelli, C., Hily-Blant, P., Dubus, G., Montmerle, T., and Gabici, S.
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
The region towards W51C is a convincing example of interaction between a supernova remnant and a surrounding molecular cloud. Large electron abundances have been reported towards the position W51C-E located in this interaction region, and it was proposed that the enhanced ionization fraction was due to cosmic ray particles freshly accelerated by the SNR shock. We present PdB interferometer observations of the H$^{13}$CO$^+$(1-0) and DCO$^+$(2-1) emission lines centered at position W51C-E. These observations confirm the previous scenario of cosmic-ray induced ionization at this location. In addition, SiO(2-1) emission has been successfully mapped in the close vicinity of W51C-E, with a spatial resolution of 7". The morphology and kinematics of the SiO emission are analyzed and strongly suggest that this emission is produced by the passage of the SNR primary shock. Put in conjunction with the enhanced ionization fraction in this region, we give a consistent picture in which the W51C-E position is located downstream of the shock, where a large reservoir of freshly accelerated particles is available., Comment: 13 pages, 4 figures, 1 table, accepted to ApJL
- Published
- 2014
- Full Text
- View/download PDF
13. Explaining two circumnuclear star forming rings in NGC5248
- Author
-
van der Laan, T. P. R., Schinnerer, E., Emsellem, E., Meidt, S., Dumas, G., Boeker, T., Hunt, L., Haan, S., Mundell, C., and Wozniak, H.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
The distribution of gas in the central kiloparsec of a galaxy has a dynamically rapid evolution. Nonaxisymmetries in the gravitational potential of the galactic disk, such as a large scale stellar bar or spiral, can lead to significant radial motion of gaseous material from larger radii to the central region. The large influx of gas and the subsequent star formation keep the central region constantly changing. However, the ability of gas to reach the nucleus proper to fuel an AGN phase is not guaranteed. Gas inflow can be halted at a circumnuclear star forming ring several hundred parsec away. The nearby galaxy NGC5248 is especially interesting in this sense since it is said to host 2 circumnuclear star forming rings at 100pc and 370pc from its quiescent nucleus. Here we present new subarcsecond PdBI+30m CO(2-1) emission line observations of the central region. For the first time the molecular gas distribution at the smallest stellar ring is resolved into a gas ring, consistent with the presence of a quiescent nucleus. However, the molecular gas shows no ring structure at the larger ring. We combine analyses of the gaseous and stellar content in the central kiloparsec of this galaxy to understand the gas distribution and dynamics of this star forming central region. We discuss the probability of two scenarios leading to the current observations, given our full understanding of this system, and discuss whether there are really two circumnuclear star forming rings in this galaxy., Comment: Accepted for publication in A&A, 14pages + long table
- Published
- 2013
- Full Text
- View/download PDF
14. The Plateau de Bure + 30m Arcsecond Whirlpool Survey reveals a thick disk of diffuse molecular gas in the M51 galaxy
- Author
-
Pety, J., Schinnerer, E., Leroy, A. K., Hughes, A., Meidt, S. E., Colombo, D., Dumas, G., Garcia-Burillo, S., Schuster, K. F., Kramer, C., Dobbs, C. L., and Thompson, T. A.
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present the data of the Plateau de Bure Arcsecond Whirlpool Survey (PAWS), a high spatial and spectral resolution 12CO(1-0) line survey of the inner 10 x 6 kpc of the M51 system, and the first wide-field imaging of molecular gas in a star-forming spiral galaxy with resolution matched to the typical size of Giant Molecular Clouds (40 pc). We describe the observation, reduction, and combination of the Plateau de Bure Interferometer (PdBI) and IRAM-30m "short spacing" data. The final data cube attains 1.1"-resolution over the 270" x 170" field of view, with sensitivity to all spatial scales from the combination of PdBI and IRAM-30m data, and brightness sensitivity of 0.4 K (1 sigma) in each 5 km/s-wide channel map. We find a CO-luminosity of 9.10^8 K km/s pc^2, corresponding to a molecular gas mass of 4.10^9 Msol for a standard CO-to-H2 conversion factor. Unexpectedly, we find that a large fraction, (50 +/- 10)%, of this emission arises mostly from spatial scales larger than 36" or about 1.3 kpc. Through a series of tests, we demonstrate that this extended emission does not result from a processing artifact. We discuss its origin in light of the stellar component, the 12CO/13CO ratio, and the difference between the kinematics and structure of the PdBI-only and hybrid synthesis (PdBI + IRAM-30m) images. The extended emission is consistent with a thick, diffuse disk of molecular gas with a typical scale height of about 200 pc, substructured in unresolved filaments which fills about 0.1% of the volume., Comment: 42 pages, 35 PostScript figures. Accepted for publication in ApJ. Uses emulateapj LaTeX macros
- Published
- 2013
- Full Text
- View/download PDF
15. A Detailed Study of the Radio--FIR Correlation in NGC6946 with Herschel-PACS/SPIRE from KINGFISH
- Author
-
Tabatabaei, F. S., Schinnerer, E., Murphy, E. J., Beck, R., Groves, B., Meidt, S., Krause, M., Rix, H-W., Sandstrom, K., Crocker, A. F., Galametz, M., Helou, G., Wilson, C. D., Kennicutt, R., Calzetti, D., Draine, B., Aniano, G., Dale, D., Dumas, G., Engelbracht, C. W., Gordon, K. D., Hinz, J., Kreckel, K., Montiel, E., and Roussel, H.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We derive the distribution of the synchrotron spectral index across NGC6946 and investigate the correlation between the radio continuum (synchrotron) and far-infrared (FIR) emission using the KINGFISH Herschel PACS and SPIRE data. The radio--FIR correlation is studied as a function of star formation rate, magnetic field strength, radiation field strength, and the total gas surface brightness. The synchrotron emission follows both star-forming regions and the so-called magnetic arms present in the inter-arm regions. The synchrotron spectral index is steepest along the magnetic arms ($\alpha_n \sim 1$), while it is flat in places of giant H{\sc ii} regions and in the center of the galaxy ($\alpha_n \sim 0.6-0.7$). The map of $\alpha_n$ provides an observational evidence for aging and energy loss of cosmic ray electrons propagating in the disk of the galaxy. Variations in the synchrotron--FIR correlation across the galaxy are shown to be a function of both star formation and magnetic fields. We find that the synchrotron emission correlates better with cold rather than with warm dust emission, when the interstellar radiation field is the main heating source of dust. The synchrotron--FIR correlation suggests a coupling between the magnetic field and the gas density. NGC6946 shows a power-law behavior between the total (turbulent) magnetic field strength B and the star formation rate surface density $\Sigma_{\rm SFR}$ with an index of 0.14\,(0.16)$\pm$0.01. This indicates an efficient production of the turbulent magnetic field with the increasing gas turbulence expected in actively star forming regions. The scale-by-scale analysis of the synchrotron--FIR correlation indicates that the ISM affects the propagation of old/diffused cosmic ray electrons, resulting in a diffusion coefficient of $D_0=4.6\times 10^{28}$\,cm$^2$\,s$^{-1}$ for 2.2\,GeV CREs., Comment: 23 pages, 13 figures, accepted for publication in Astronomy & Astrophysics Journal
- Published
- 2013
- Full Text
- View/download PDF
16. Skull vibration induced nystagmus in patients with superior semicircular canal dehiscence
- Author
-
Dumas, G., Tan, H., Dumas, L., Perrin, P., Lion, A., and Schmerber, S.
- Published
- 2019
- Full Text
- View/download PDF
17. Nystagmus induit par vibration dans les déhiscences du canal antérieur
- Author
-
Dumas, G., Tan, H., Dumas, L., Perrin, P., Lion, A., and Schmerber, S.
- Published
- 2019
- Full Text
- View/download PDF
18. A Study of Heating and Cooling of the ISM in NGC 1097 with Herschel-PACS and Spitzer-IRS
- Author
-
Beirao, P., Armus, L., Helou, G., Appleton, P. N., Smith, J. -D. T., Croxall, K. V., Murphy, E. J., Dale, D. A., Draine, B. T., Wolfire, M. G., Sandstrom, K. M., Aniano, G., Bolatto, A. D., Groves, B., Brandl, B. R., Schinnerer, E., Crocker, A. F., Hinz, J. L., Rix, H. -W., Kennicutt, R. C., Calzetti, D., de Paz, A. Gil, Dumas, G., Galametz, M., Gordon, K. D., Hao, C. -N., Johnson, B., Koda, J., Krause, O., van der Laan, T., Leroy, A. K., Li, Y., Meidt, S. E., Meyer, J. D., Rahman, N., Roussel, H., Sauvage, M., Srinivasan, S., Vigroux, L., Walter, F., and Warren, B. E.
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
NGC 1097 is a nearby Seyfert 1 galaxy with a bright circumnuclear starburst ring, a strong large-scale bar and an active nucleus. We present a detailed study of the spatial variation of the far infrared (FIR) [CII]158um and [OI]63um lines and mid-infrared H2 emission lines as tracers of gas cooling, and of the polycyclic aromatic hydrocarbon (PAH) bands as tracers of the photoelectric heating, using Herschel-PACS, and Spitzer-IRS infrared spectral maps. We focus on the nucleus and the ring, and two star forming regions (Enuc N and Enuc S). We estimated a photoelectric gas heating efficiency ([CII]158um+[OI]63um)/PAH in the ring about 50% lower than in Enuc N and S. The average 11.3/7.7um PAH ratio is also lower in the ring, which may suggest a larger fraction of ionized PAHs, but no clear correlation with [CII]158{\mu}m/PAH(5.5 - 14um) is found. PAHs in the ring are responsible for a factor of two more [CII]158um and [OI]63um emission per unit mass than PAHs in the Enuc S. SED modeling indicates that at most 25% of the FIR power in the ring and Enuc S can come from high intensity photodissociation regions (PDRs), in which case G0 ~ 10^2.3 and nH ~ 10^3.5 cm^-3 in the ring. For these values of G0 and nH PDR models cannot reproduce the observed H2 emission. Much of the the H2 emission in the starburst ring could come from warm regions in the diffuse ISM that are heated by turbulent dissipation or shocks., Comment: 17 pages, 14 figures, 5 tables; accepted for publication in ApJ
- Published
- 2012
- Full Text
- View/download PDF
19. The local radio-IR correlation in M51
- Author
-
Dumas, G., Schinnerer, E., Tabatabaei, F. S., Beck, R., Velusamy, T., and Murphy, E.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We observed M51 at three frequencies, 1.4GHz (20cm), 4.9GHz (6cm) and 8.4GHz (3.6cm), with the VLA and the Effelsberg 100m telescope to obtain the highest quality radio continuum images of a nearby spiral galaxy. These radio data were combined with deconvolved Spitzer IRAC 8mum and MIPS 24mum images to search for and investigate local changes in the radio-IR correlation. Utilizing wavelet decomposition, we compare the distribution of the radio and IR emission on spatial scales between 200pc and 30kpc. We show that the radio-IR correlation is not uniform across the galactic disk. It presents a complex behavior with local extrema corresponding to various galactic structures, such as complexes of HII regions, spiral arms and interarm filaments, indicating that the contribution of the thermal and non-thermal radio emission is a strong function of environment. In particular, the relation of the 24mum and 20cm emission presents a linear relation within the spiral arms and globally over the galaxy, while it deviates from linearity in the interarm and outer regions as well in the inner region, with two different behaviours: it is sublinear in the interarm and outer region and over-linear in the central 3.5kpc. Our analysis suggests that the changes in the radio/IR correlation reflect variations of ISM properties between spiral arms and interarm region. The good correlation in the spiral arms implies that 24mum and 20cm are tracing recent star formation, while a change in the dust opacity, 'Cirrus' contribution to the IR emission and/or the relation between the magnetic field strength and the gas density can explain the different relations found in the interarm, outer and inner regions., Comment: 50 pages, 13 figures, 5 tables, accepted for publication in AJ
- Published
- 2010
- Full Text
- View/download PDF
20. Type II and IV radio bursts in the active period October-November 2003
- Author
-
Petoussis, V., Tsitsipis, P., Kontogeorgos, A., Moussas, X., Preka-Papadema, P., Hillaris, A., Caroubalos, C., Alissandrakis, C. E., Bougeret, J. -L., and Dumas, G.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
In this report we present the Type II and IV radio bursts observed and analyzed by the radio spectrograph ARTEMIS IV1, in the 650-20MHz frequency range, during the active period October-November 2003. These bursts exhibit very rich fine structures such fibers, pulsations and zebra patterns which is associated with certain characteristics of the associated solar flares and CMEs., Comment: Recent Advances in Astronomy and Astrophysics: 7th International Conference of the Hellenic Astronomical Society. AIP Conference Proceedings, Volume 848, pp. 199-206 (2006)
- Published
- 2010
- Full Text
- View/download PDF
21. Type II Shocks Characteristics: Comparison with associated CMEs and Flares
- Author
-
Pothitakis, G., Mitsakou, E., Preka-Papadema, P., Moussas, X., Caroubalos, C., Alissandrakis, C. E., Hillaris, A., Tsitsipis, P., Kontogeorgos, A., Bougeret, J. -L., and Dumas, G.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
A number of metric (100-650 MHz) typeII bursts was recorded by the ARTEMIS-IV radiospectrograph in the 1998-2000 period; the sample includes both CME driven shocks and shocks originating from flare blasts. We study their characteristics in comparison with characteristics of associated CMEs and flares., Comment: Recent Advances in Astronomy and Astrophysics: 7th International Conference of the Hellenic Astronomical Society. AIP Conference Proceedings, Volume 848, pp. 238-242 (2006)
- Published
- 2010
- Full Text
- View/download PDF
22. Ten Years of the Solar Radiospectrograph ARTEMIS-IV
- Author
-
Caroubalos, C., Alissandrakis, C. E., Hillaris, A., Preka-Papadema, P., Polygiannakis, J., Moussas, X., Tsitsipis, P., Kontogeorgos, A., Petoussis, V., Bouratzis, C., Bougeret, J. -L., Dumas, G., and Nindos, A.
- Subjects
Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
The Solar Radiospectrograph of the University of Athens (ARTEMIS-IV) is in operation at the Thermopylae Satellite Communication Station since 1996. The observations extend from the base of the Solar Corona (650 MHz) to about 2 Solar Radii (20 MHz) with time resolution 1/10-1/100 sec. The instruments recordings, being in the form of dynamic spectra, measure radio flux as a function of height in the corona; our observations are combined with spatial data from the Nancay Radioheliograph whenever the need for 3D positional information arises. The ARTEMIS-IV contribution in the study of solar radio bursts is two fold- Firstly, in investigating new spectral characteristics since its high sampling rate facilitates the study of fine structures in radio events. On the other hand it is used in studying the association of solar bursts with interplanetary phenomena because of its extended frequency range which is, furthermore, complementary to the range of the WIND/WAVES receivers and the observations may be readily combined. This reports serves as a brief account of this operation. Joint observations with STEREO/WAVES and LOFAR low frequency receivers are envisaged in the future.
- Published
- 2010
- Full Text
- View/download PDF
23. ARTEMIS IV Radio Observations of the 14 July 2000 Large Solar Event
- Author
-
Caroubalos, C., Alissandrakis, C. E., Hillaris, A., Nindos, A., Tsitsipis, P., Moussas, X., Bougeret, J. -L., Bouratzis, K., Dumas, G., Kanellakis, G., Kontogeorgos, A., Maroulis, D., Patavalis, N., Perche, C., Polygiannakis, J., and Preka-Papadema, P.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
In this report we present a complex metric burst, associated with the 14 July 2000 major solar event, recorded by the ARTEMIS-IV radio spectrograph at Thermopylae. Additional space-borne and Earth-bound observational data are used, in order to identify and analyze the diverse, yet associated, processes during this event. The emission at metric wavelengths consisted of broad-band continua including a moving and a stationary type IV, impulsive bursts and pulsating structures. The principal release of energetic electrons in the corona was 15 20 min after the start of the flare, in a period when the flare emission spread rapidly eastwards and a hard X-ray peak occurred. Backward extrapolation of the CME also puts its origin in the same time interval, however, the uncertainty of the extrapolation does not allow us to associate the CME with any particular radio or X-ray signature. Finally, we present high time and spectral resolution observations of pulsations and fiber bursts, together with a preliminary statistical analysis., Comment: Solar Physics, v. 204, Issue 1/2, p. 165-177 (2001)
- Published
- 2010
- Full Text
- View/download PDF
24. Solar flares with and without SOHO/LASCO coronal mass ejections and type II shocks
- Author
-
Hillaris, A., Petousis, V., Mitsakou, E., Vassiliou, C., Moussas, X., Polygiannakis, J., Preka-Papadema, P., Caroubalos, C., Alissandrakis, C., Tsitsipis, P., Kontogeorgos, A., Bougeret, J-L, and Dumas, G.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
We analyse of a set of radio rich (accompanied by type IV or II bursts) solar flares and their association with SOHO/LASCO Coronal Mass Ejections in the period 1998 2000. The intensity, impulsiveness and energetics of these events are investigated. We find that, on the average, flares associated both with type IIs and CMEs are more impulsive and more energetic than flares associated with type IIs only (without CME reported), as well as flares accompanied by type IV continua but not type II shocks. From the last two classes, flares with type II bursts (without CMEs reported) are the shortest in duration and the most impulsive., Comment: Advances in Space Research, Volume 38, Issue 5, p. 1007-1010
- Published
- 2010
- Full Text
- View/download PDF
25. The improved ARTEMIS IV multichannel solar radio spectrograph of the University of Athens
- Author
-
Kontogeorgos, A., Tsitsipis, P., Caroubalos, C., Moussas, X., Preka-Papadema, P., Hilaris, A., Petoussis, V., Bouratzis, C., Bougeret, J-L, Alissandrakis, C. E., and Dumas, G.
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We present the improved solar radio spectrograph of the University of Athens operating at the Thermopylae Satellite Telecommunication Station. Observations now cover the frequency range from 20 to 650 MHz. The spectrograph has a 7-meter moving parabola fed by a log-periodic antenna for 100 650 MHz and a stationary inverted V fat dipole antenna for the 20 100 MHz range. Two receivers are operating in parallel, one swept frequency for the whole range (10 spectrums/sec, 630 channels/spectrum) and one acousto-optical receiver for the range 270 to 450 MHz (100 spectrums/sec, 128 channels/spectrum). The data acquisition system consists of two PCs (equipped with 12 bit, 225 ksamples/sec ADC, one for each receiver). Sensitivity is about 3 SFU and 30 SFU in the 20 100 MHz and 100 650 MHz range respectively. The daily operation is fully automated: receiving universal time from a GPS, pointing the antenna to the sun, system calibration, starting and stopping the observations at preset times, data acquisition, and archiving on DVD. We can also control the whole system through modem or Internet. The instrument can be used either by itself or in conjunction with other instruments to study the onset and evolution of solar radio bursts and associated interplanetary phenomena., Comment: Experimental Astronomy, Volume 21, Issue 1, pp.41-55
- Published
- 2010
- Full Text
- View/download PDF
26. Type III events, flares and CMEs, in the extremely active period October-November 2003
- Author
-
Mitsakou, E., Thanasa, M., Preka-Papadema, P., Moussas, X., Hillaris, A., Caroubalos, C., Alissandrakis, C. E., Tsitsipis, P., Kontogeorgos, A., Bougeret, J. -L., and Dumas, G.
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
The type III observations trace the propagation of energetic electron populations through the Solar Corona which, more often than not, precede or are associated with energy release on the Sun. A sample of Type III bursts in the range 20-650 MHz during the period of extraordinary solar activity (20 October to 4 November 2003) recorded by the ARTEMIS-IV1 radio spectrograph is analysed; its parameters are compared with characteristics of associated flares (Ha and GOES SXR) and CMEs, observed in the same period and reported in the SGR and the LASCO archives respectively. In this report we attempt to establish a correlation between energetic particles and major manifestations of solar activity such as flares and CMEs., Comment: Recent Advances in Astronomy and Astrophysics: 7th International Conference of the Hellenic Astronomical Society. AIP Conference Proceedings, Volume 848, pp. 234-237 (2006)
- Published
- 2010
- Full Text
- View/download PDF
27. Cold Molecular Gas in the Inner Two Kiloparsec of NGC4151
- Author
-
Dumas, G., Schinnerer, E., and Mundell, C. G.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present the first spatially resolved spectroscopic imaging observations of the 12CO(1-0) line emission in the central 2.5 kpc of the Seyfert 1 galaxy NGC4151, obtained with the IRAM Plateau de Bure Interferometer (PdBI). Most of the cold molecular gas is distributed along two curved gas lanes about 1 kpc north and south of the active nucleus, coincident with the circumnuclear dust ring noted by previous authors. These CO arcs lie within the Inner Lindblad Resonance of the large scale oval bar and have kinematics consistent with those derived from neutral hydrogen observations of the disk and bar. Two additional gas clumps are detected that show non-circular motions - one associated with the southern gas lane and one lying ~600 pc north of the nucleus. Closer to the nucleus, no cold molecular gas is detected in the central 300 pc where abundant near-IR H2 line emission arises. This suggests that the H2 line emission is not a good indicator for a cold gas reservoir in NGC4151 and that the H2 is likely photo-excited by the AGN. The upper limit of the CO mass in the central 300 pc is sufficient to support the AGN activity at its current level for 10^7 yrs. The total cold molecular mass detected by PdBI is 4.3 10^7 Msun. Finally, 3 mm continuum emission arising from the location of the AGN is detected with a flux of S~14 mJy and appears to be unresolved at an angular resolution of 2.8" (~180 pc)., Comment: accepted to ApJ, 29 pages, 10 figures
- Published
- 2010
- Full Text
- View/download PDF
28. Mapping far-IR emission from the central kiloparsec of NGC 1097
- Author
-
Sandstrom, K., Krause, O., Linz, H., Schinnerer, E., Dumas, G., Meidt, S., Rix, H. -W., Sauvage, M., Walter, F., Kennicutt, R. C., Calzetti, D., Appleton, P., Armus, L., Beirão, P., Bolatto, A., Brandl, B., Crocker, A., Croxall, K., Dale, D., Draine, B. T., Engelbracht, C., de Paz, A. Gil, Gordon, K., Groves, B., Hao, C. -N., Helou, G., Hinz, J., Hunt, L., Johnson, B. D., Koda, J., Leroy, A., Murphy, E. J., Rahman, N., Roussel, H., Skibba, R., Smith, J. -D., Srinivasan, S., Vigroux, L., Warren, B. E., Wilson, C. D., Wolfire, M., and Zibetti, S.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Using photometry of NGC 1097 from the Herschel PACS (Photodetector Array Camera and Spectrometer) instrument, we study the resolved properties of thermal dust continuum emission from a circumnuclear starburst ring with a radius ~ 900 pc. These observations are the first to resolve the structure of a circumnuclear ring at wavelengths that probe the peak (i.e. lambda ~ 100 micron) of the dust spectral energy distribution. The ring dominates the far-infrared (far-IR) emission from the galaxy - the high angular resolution of PACS allows us to isolate the ring's contribution and we find it is responsible for 75, 60 and 55% of the total flux of NGC 1097 at 70, 100 and 160 micron, respectively. We compare the far-IR structure of the ring to what is seen at other wavelengths and identify a sequence of far-IR bright knots that correspond to those seen in radio and mid-IR images. The mid- and far-IR band ratios in the ring vary by less than +/- 20% azimuthally, indicating modest variation in the radiation field heating the dust on ~ 600 pc scales. We explore various explanations for the azimuthal uniformity in the far-IR colors of the ring including a lack of well-defined age gradients in the young stellar cluster population, a dominant contribution to the far-IR emission from dust heated by older (> 10 Myr) stars and/or a quick smoothing of local enhancements in dust temperature due to the short orbital period of the ring. Finally, we improve previous limits on the far-IR flux from the inner ~ 600 pc of NGC 1097 by an order of magnitude, providing a better estimate of the total bolometric emission arising from the active galactic nucleus and its associated central starburst., Comment: Accepted for publication in the A&A Herschel Special Edition
- Published
- 2010
- Full Text
- View/download PDF
29. Enhanced dust heating in the bulges of early-type spiral galaxies
- Author
-
Engelbracht, C. W., Hunt, L. K., Skibba, R. A., Hinz, J. L., Calzetti, D., Gordon, K. D., Roussel, H., Crocker, A. F., Misselt, K. A., Bolatto, A. D., Kennicutt, R. C., Appleton, P. N., Armus, L., Beirão, P., Brandl, B. R., Croxall, K. V., Dale, D. A., Draine, B. T., Dumas, G., de Paz, A. Gil, Groves, B., Hao, C. -N., Johnson, B. D., Koda, J., Krause, O., Leroy, A. K., Meidt, S. E., Murphy, E. J., Rahman, N., Rix, H. -W., Sandstrom, K. M., Sauvage, M., Schinnerer, E., Smith, J. -D. T., Srinivasan, S., Vigroux, L., Walter, F., Warren, B. E., Wilson, C. D., Wolfire, M. G., and Zibetti, S.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Stellar density and bar strength should affect the temperatures of the cool (T ~ 20-30 K) dust component in the inner regions of galaxies, which implies that the ratio of temperatures in the circumnuclear regions to the disk should depend on Hubble type. We investigate the differences between cool dust temperatures in the central 3 kpc and disk of 13 nearby galaxies by fitting models to measurements between 70 and 500 microns. We attempt to quantify temperature trends in nearby disk galaxies, with archival data from Spitzer/MIPS and new observations with Herschel/SPIRE, which were acquired during the first phases of the Herschel observations for the KINGFISH (key insights in nearby galaxies: a far-infrared survey with Herschel) sample. We fit single-temperature modified blackbodies to far-infrared and submillimeter measurements of the central and disk regions of galaxies to determine the temperature of the component(s) emitting at those wavelengths. We present the ratio of central-region-to-disk-temperatures of the cool dust component of 13 nearby galaxies as a function of morphological type. We find a significant temperature gradient in the cool dust component in all galaxies, with a mean center-to-disk temperature ratio of 1.15 +/- 0.03. The cool dust temperatures in the central ~3 kpc of nearby galaxies are 23(+/-3)% hotter for morphological types earlier than Sc, and only 9(+/-3)% hotter for later types. The temperature ratio is also correlated with bar strength, with only strongly barred galaxies having a ratio over 1.2. The strong radiation field in the high stellar density of a galactic bulge tends to heat the cool dust component to higher temperatures, at least in early-type spirals with relatively large bulges, especially when paired with a strong bar., Comment: Accepted for publication on the A&A Herschel Special Issue
- Published
- 2010
- Full Text
- View/download PDF
30. Far-Infrared Line Imaging of the Starburst Ring in NGC 1097 with the Herschel/PACS Spectrometer
- Author
-
Beirao, P., Armus, L., Appleton, P. N., Smith, J. -D. T., Croxall, K. V., Murphy, E. J., Dale, D. A., Helou, G., Kennicutt, R. C., Calzetti, D., Bolatto, A. D., Brandl, B. R., Crocker, A. F., Draine, B. T., Dumas, G., Engelbracht, C. W., de Paz, A. Gil, Gordon, K. D., Groves, B., Hao, C. -N., Hinz, J. L., Hunt, L. K., Johnson, B. D., Koda, J., Krause, O., Leroy, A. K., Meidt, S. E., Richer, J., Rix, H. -W., Rahman, N., Roussel, H., Sandstrom, K. M., Sauvage, M., Schinnerer, E., Skibba, R. A., Srinivasan, S., Walter, F., Warren, B. E., Wilson, C. D., Wolfire, M. G., and Zibetti, S.
- Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
NGC 1097 is a nearby SBb galaxy with a Seyfert nucleus and a bright starburst ring. We study the physical properties of the interstellar medium (ISM) in the ring using spatially resolved far-infrared spectral maps of the circumnuclear starburst ring of NGC 1097, obtained with the PACS spectrometer on board the Herschel Space Telescope. In particular, we map the important ISM cooling and diagnostic emission lines of [OI] 63 $\mu$m, [OIII] 88 $\mu$m, [NII] 122 $\mu$m, [CII] 158 $\mu$m and [NII] 205 $\mu$m. We observe that in the [OI] 63 $\mu$m, [OIII] 88 $\mu$m, and [NII] 122 $\mu$m line maps, the emission is enhanced in clumps along the NE part of the ring. We observe evidence of rapid rotation in the circumnuclear ring, with a rotation velocity of ~220$ km s$^{-1}$ (inclination uncorrected) measured in all lines. The [OI] 63 $\mu$m/[CII] 158 $\mu$m ratio varies smoothly throughout the central region, and is enhanced on the northeastern part of the ring, which may indicate a stronger radiation field. This enhancement coincides with peaks in the [OI] 63 $\mu$m and [OIII] 88 $\mu$m maps. Variations of the [NII] 122 $\mu$m/[NII] 205 $\mu$m ratio correspond to a range in the ionized gas density between 150 and 400 cm$^{-3}$., Comment: Accepted for publication on the A&A Herschel Special Issue
- Published
- 2010
- Full Text
- View/download PDF
31. Fueling active galactic nuclei. II. Spatially resolved molecular inflows and outflows
- Author
-
Davies, RI, Maciejewski, W, Hicks, EKS, Emsellem, E, Erwin, P, Burtscher, L, Dumas, G, Lin, M, Malkan, MA, Müller-Sánchez, F, Orban De Xivry, G, Rosario, DJ, Schnorr-Müller, A, and Tran, A
- Subjects
galaxies: active ,galaxies: ISM ,galaxies: kinematics and dynamics ,galaxies: nuclei ,galaxies: Seyfert ,infrared: galaxies ,Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Physical Chemistry ,Astronomy & Astrophysics ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Physical Chemistry (incl. Structural) - Abstract
We analyze the two-dimensional distribution and kinematics of the stars as well as molecular and ionized gas in the central few hundred parsecs of five active and five matched inactive galaxies. The equivalent widths of the Brγ line indicate that there is no ongoing star formation in their nuclei, although recent (terminated) starbursts are possible in the active galaxies. The stellar velocity fields show no signs of non-circular motions, while the 1-0 S(1) H2 kinematics exhibit significant deviations from simple circular rotation. In the active galaxies the H2 kinematics reveal inflow and outflow superimposed on disk rotation. Steady-state circumnuclear inflow is seen in three active galactic nuclei (AGNs), and hydrodynamical models indicate it can be driven by a large-scale bar. In three of the five AGNs, molecular outflows are spatially resolved. The outflows are oriented such that they intersect, or have an edge close to, the disk, which may be the source of molecular gas in the outflow. The relatively low speeds imply the gas will fall back onto the disk, and with moderate outflow rates, they will have only a local impact on the host galaxy. H2 was detected in two inactive galaxies. These exhibit chaotic circumnuclear dust morphologies and have molecular structures that are counter-rotating with respect to the main gas component, which could lead to gas inflow in the near future. In our sample, all four galaxies with chaotic dust morphology in the circumnuclear region exist in moderately dense groups with 10-15 members where accretion of stripped gas can easily occur. © 2014. The American Astronomical Society. All rights reserved..
- Published
- 2014
32. Efficient control of the fully passive oscillating foil in 2D confined flows with adjustment of the heave damping.
- Author
-
Gunther, K., Genest, B., and Dumas, G.
- Subjects
ELECTRIC generators ,FLUID-structure interaction ,FLOW velocity ,ENERGY consumption ,TURBINES ,GROUNDWATER flow ,UNSTEADY flow - Abstract
A foil that is free to pitch and heave in an upstream flow can oscillate very regularly and with large amplitudes given that its inertial properties and support stiffness in pitch and heave are well adapted to the flow velocity. Useful energy can be extracted from these oscillations via an appropriate damping in heave that models the presence of an electric generator. In recent years, the structural parameters of such a fully passive oscillating-foil turbine (OFT) have been optimized, yielding a maximum energy extraction efficiency of 51.0% under the assumptions of 2D and unconfined flow. However, the turbine is normally deployed in channels with finite cross-sectional area, thus impacting the flow rate passing through the turbine via the blockage effect. In this work, we extend the applicability of the 2D optimized structural parameters to 2D confined scenarios with a simple tuning of the viscous heave damping coefficient. Performance is determined via a fluid-structure interaction solver based on an unsteady Reynolds-averaged Navier–Stokes approach. As expected, confining the turbine increases the heave amplitude and the power, up to a point where the motions become chaotic, and thus require an increase in the heave damping coefficient. This study shows that in all confined 2D scenarios, reasonably good performances of the fully passive OFT can be maintained when using its optimal structural parameters obtained in 2D unconfined conditions, given that the generator is adjusted accordingly. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
33. 103. Prediction of body temperature of gestating sows using a thermal camera
- Author
-
Durand, M., primary, Gagnon, P., additional, Cloutier, L., additional, Dumas, G., additional, Guay, F., additional, Dourmad, J.Y., additional, and Gaillard, C., additional
- Published
- 2023
- Full Text
- View/download PDF
34. 82. Evaluating the effectiveness of aerogeothermy in filtering and conditioning the air entering swine buildings
- Author
-
Turcotte, S., primary, Turgeon, J.G., additional, and Dumas, G., additional
- Published
- 2023
- Full Text
- View/download PDF
35. 46. Effects of precision feeding and the [LDQUO]bump feeding[RDQUO] strategy in gestating sows on performances and body condition in sows monitored for the first two gestation-lactation cycles
- Author
-
Galiot, L., primary, Cloutier, L., additional, Guay, F., additional, Dumas, G., additional, Gaillard, C., additional, Dourmad, J.Y., additional, Simongiovanni, A., additional, and Gagnon, P., additional
- Published
- 2023
- Full Text
- View/download PDF
36. 3D Studies of Neutral and Ionised Gas and Stars in Seyfert and Inactive Galaxies
- Author
-
Mundell, C. G., Dumas, G., Schinnerer, E., Nagar, N., Haan, S., Wilcots, E., Wilson, A. S., Emsellem, E., Ferruit, P., Peletier, R. F., and De Zeeuw, P. T.
- Subjects
Astrophysics - Abstract
We are conducting the first systematic 3D spectroscopic imaging survey to quantify the properties of the atomic gas (HI) in a distance-limited sample of 28 Seyfert galaxies and a sample of 28 inactive control galaxies with well-matched optical properties (the VHIKINGS survey). This study aims to address the role of the host galaxy in nuclear activity and confront outstanding controversies in optical/IR imaging surveys. Early results show possible relationships between Seyfert activity and HI extent, content and the prevalence of small, nearby gas-rich dwarf galaxies (M(HI)~10^7 Msun); results will be tested via rigorous comparison with control galaxies. Initial results from our optical followup study of 15 of our galaxies using the SAURON integral field unit on the WHT suggest a possible difference between Seyfert and inactive stellar and gaseous kinematics that support the conclusion that internal kinematics of galaxies are the key to nuclear activity., Comment: 6 pages to be published in the proceedings of "The Fate of Gas in Galaxies", held in Dwingeloo, July 2006
- Published
- 2006
- Full Text
- View/download PDF
37. FUELING ACTIVE GALACTIC NUCLEI. I. HOW THE GLOBAL CHARACTERISTICS OF THE CENTRAL KILOPARSEC OF SEYFERTS DIFFER FROM QUIESCENT GALAXIES**Based on observations at the ESO Very Large Telescope (083.B-0332).
- Author
-
Hicks, EKS, Davies, RI, Maciejewski, W, Emsellem, E, Malkan, MA, Dumas, G, Müller-Sánchez, F, and Rivers, A
- Subjects
galaxies: active ,galaxies: kinematics and dynamics ,galaxies: nuclei ,galaxies: Seyfert ,infrared: galaxies ,astro-ph.CO ,Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Physical Chemistry (incl. Structural) ,Astronomy & Astrophysics - Abstract
In a matched sample of Seyfert and quiescent galaxies we simultaneously probe the stellar and molecular gas kinematics from 1 kpc down to 50 pc with the aim of identifying the dynamical processes dictating black hole accretion rates. This first paper compares the global characteristics of a sample of 10 galaxies. We find several differences within a radius of 500 pc that are correlated with active galactic nucleus (AGN) activity. The Seyferts have (1) a more centrally concentrated nuclear stellar surface brightness with lower stellar luminosities beyond a radius of 100 pc, (2) a lower stellar velocity dispersion within a radius of 200 pc, (3) elevated H2 1-0 S(1) luminosity out to a radius of at least 250 pc, and (4) more centrally concentrated H2 surface brightness profiles. These observed differences can be interpreted as evidence for Seyfert galaxies having a dynamically cold (in comparison to the bulge) nuclear structure composed of a significant gas reservoir and a relatively young stellar population. This structure is undetected (and possibly does not exist) in quiescent galaxies. The presence of such a nuclear structure in Seyfert galaxies provides evidence for inflow of the surrounding interstellar medium since the nuclear stellar population requires a supply of gas from which to form. The fueling of a Seyfert AGN is thus associated with the formation of a dynamically cold component of gas and stars on scales of hundreds of parsecs. © 2013. The American Astronomical Society. All rights reserved..
- Published
- 2013
38. Endolymphatic hydrops imaging: Differential diagnosis in patients with Meniere disease symptoms
- Author
-
Attyé, A., Eliezer, M., Galloux, A., Pietras, J., Tropres, I., Schmerber, S., Dumas, G., and Krainik, A.
- Published
- 2017
- Full Text
- View/download PDF
39. Processing of social and monetary rewards in autism spectrum disorders.
- Author
-
Baumeister, S., Moessnang, C., Bast, N., Hohmann, S., Aggensteiner, P., Kaiser, A., Tillmann, J., Goyard, D., Charman, T., Ambrosino, S., Baron-Cohen, S., Beckmann, C.F., Bölte, S., Bourgeron, T., Rausch, A., Crawley, D., Dell'Acqua, F., Dumas, G., Durston, S., Ecker, C., Floris, D.L., Frouin, V., Hayward, H., Holt, R., Johnson, M.H., Jones, E.J.H., Lai, M.C., Lombardo, M.V., Mason, L., Oakley, B., Oldehinkel, M., Persico, A.M., San José Cáceres, A., Wolfers, T., Loth, E., Murphy, D.G.M., Buitelaar, J.K., Tost, H., Meyer-Lindenberg, A., Banaschewski, T., Brandeis, D., Baumeister, S., Moessnang, C., Bast, N., Hohmann, S., Aggensteiner, P., Kaiser, A., Tillmann, J., Goyard, D., Charman, T., Ambrosino, S., Baron-Cohen, S., Beckmann, C.F., Bölte, S., Bourgeron, T., Rausch, A., Crawley, D., Dell'Acqua, F., Dumas, G., Durston, S., Ecker, C., Floris, D.L., Frouin, V., Hayward, H., Holt, R., Johnson, M.H., Jones, E.J.H., Lai, M.C., Lombardo, M.V., Mason, L., Oakley, B., Oldehinkel, M., Persico, A.M., San José Cáceres, A., Wolfers, T., Loth, E., Murphy, D.G.M., Buitelaar, J.K., Tost, H., Meyer-Lindenberg, A., Banaschewski, T., and Brandeis, D.
- Abstract
Item does not contain fulltext, BACKGROUND: Reward processing has been proposed to underpin the atypical social feature of autism spectrum disorder (ASD). However, previous neuroimaging studies have yielded inconsistent results regarding the specificity of atypicalities for social reward processing in ASD. AIMS: Utilising a large sample, we aimed to assess reward processing in response to reward type (social, monetary) and reward phase (anticipation, delivery) in ASD. METHOD: Functional magnetic resonance imaging during social and monetary reward anticipation and delivery was performed in 212 individuals with ASD (7.6-30.6 years of age) and 181 typically developing participants (7.6-30.8 years of age). RESULTS: Across social and monetary reward anticipation, whole-brain analyses showed hypoactivation of the right ventral striatum in participants with ASD compared with typically developing participants. Further, region of interest analysis across both reward types yielded ASD-related hypoactivation in both the left and right ventral striatum. Across delivery of social and monetary reward, hyperactivation of the ventral striatum in individuals with ASD did not survive correction for multiple comparisons. Dimensional analyses of autism and attention-deficit hyperactivity disorder (ADHD) scores were not significant. In categorical analyses, post hoc comparisons showed that ASD effects were most pronounced in participants with ASD without co-occurring ADHD. CONCLUSIONS: Our results do not support current theories linking atypical social interaction in ASD to specific alterations in social reward processing. Instead, they point towards a generalised hypoactivity of ventral striatum in ASD during anticipation of both social and monetary rewards. We suggest this indicates attenuated reward seeking in ASD independent of social content and that elevated ADHD symptoms may attenuate altered reward seeking in ASD.
- Published
- 2023
40. Cross-sectional and longitudinal neuroanatomical profiles of distinct clinical (adaptive) outcomes in autism.
- Author
-
Pretzsch, C.M., Floris, D.L., Schäfer, T., Bletsch, A., Gurr, C., Lombardo, M.V., Chatham, C.H., Tillmann, J., Charman, T., Arenella, M., Jones, E., Ambrosino, S., Bourgeron, T., Dumas, G., Cliquet, F., Leblond, C.S., Loth, E., Oakley, B., Buitelaar, J.K., Baron-Cohen, S., Beckmann, C.F., Persico, A.M., Banaschewski, T., Durston, S., Freitag, C.M., Murphy, D.G.M., Ecker, C., Pretzsch, C.M., Floris, D.L., Schäfer, T., Bletsch, A., Gurr, C., Lombardo, M.V., Chatham, C.H., Tillmann, J., Charman, T., Arenella, M., Jones, E., Ambrosino, S., Bourgeron, T., Dumas, G., Cliquet, F., Leblond, C.S., Loth, E., Oakley, B., Buitelaar, J.K., Baron-Cohen, S., Beckmann, C.F., Persico, A.M., Banaschewski, T., Durston, S., Freitag, C.M., Murphy, D.G.M., and Ecker, C.
- Abstract
Contains fulltext : 300029.pdf (Publisher’s version ) (Open Access), Individuals with autism spectrum disorder (henceforth referred to as autism) display significant variation in clinical outcome. For instance, across age, some individuals' adaptive skills naturally improve or remain stable, while others' decrease. To pave the way for 'precision-medicine' approaches, it is crucial to identify the cross-sectional and, given the developmental nature of autism, longitudinal neurobiological (including neuroanatomical and linked genetic) correlates of this variation. We conducted a longitudinal follow-up study of 333 individuals (161 autistic and 172 neurotypical individuals, aged 6-30 years), with two assessment time points separated by ~12-24 months. We collected behavioural (Vineland Adaptive Behaviour Scale-II, VABS-II) and neuroanatomical (structural magnetic resonance imaging) data. Autistic participants were grouped into clinically meaningful "Increasers", "No-changers", and "Decreasers" in adaptive behaviour (based on VABS-II scores). We compared each clinical subgroup's neuroanatomy (surface area and cortical thickness at T1, ∆T (intra-individual change) and T2) to that of the neurotypicals. Next, we explored the neuroanatomical differences' potential genomic associates using the Allen Human Brain Atlas. Clinical subgroups had distinct neuroanatomical profiles in surface area and cortical thickness at baseline, neuroanatomical development, and follow-up. These profiles were enriched for genes previously associated with autism and for genes previously linked to neurobiological pathways implicated in autism (e.g. excitation-inhibition systems). Our findings suggest that distinct clinical outcomes (i.e. intra-individual change in clinical profiles) linked to autism core symptoms are associated with atypical cross-sectional and longitudinal, i.e. developmental, neurobiological profiles. If validated, our findings may advance the development of interventions, e.g. targeting mechanisms linked to relatively poorer outcomes.
- Published
- 2023
41. On the interaction between a body-meshed end-plate and an actuator line based on an anisotropic Gaussian kernel
- Author
-
Breault, M.-A., primary, Rochefort, P., additional, and Dumas, G., additional
- Published
- 2023
- Full Text
- View/download PDF
42. Attitudes of physicians towards the care of critically ill elderly patients – a European survey
- Author
-
Guidet, B., De Lange, D. W., Christensen, S., Moreno, R., Fjølner, J., Dumas, G., and Flaatten, H.
- Published
- 2018
- Full Text
- View/download PDF
43. Effets cardiovasculaires graves des chimiothérapies, thérapies ciblées et des traitements immunosuppresseurs
- Author
-
Dumas, G. and Canet, E.
- Published
- 2016
- Full Text
- View/download PDF
44. Recurrent peripheral vestibulopathy: Is MRI useful for the diagnosis of endolymphatic hydrops in clinical practice?
- Author
-
Attyé, Arnaud, Dumas, G., Troprès, I., Roustit, M., Karkas, A., Banciu, E., Pietras, J., Lamalle, L., Schmerber, S., and Krainik, A.
- Published
- 2015
- Full Text
- View/download PDF
45. Interindividual Differences in Cortical Thickness and Their Genomic Underpinnings in Autism Spectrum Disorder
- Author
-
Ecker, C., Pretzsch, C.M., Bletsch, A., Mann, C., Schaefer, T., Ambrosino, S., Tillmann, J., Yousaf, A., Chiocchetti, A., Lombardo, M.V., Warrier, V., Bast, N., Moessnang, C., Baumeister, S., Dell'Acqua, F., Floris, D.L., Zabihi, M., Marquand, A.F., Cliquet, F., Leblond, C., Moreau, C., Puts, N., Banaschewski, T., Jones, E.J.H., Mason, L., Bölte, S., Meyer-Lindenberg, A., Persico, A.M., Durston, S., Baron-Cohen, S., Spooren, W., Loth, E., Freitag, C.M., Charman, T., Dumas, G., Bourgeron, T., Beckmann, C.F., Buitelaar, J.K., Murphy, D.G.M., Ecker, C., Pretzsch, C.M., Bletsch, A., Mann, C., Schaefer, T., Ambrosino, S., Tillmann, J., Yousaf, A., Chiocchetti, A., Lombardo, M.V., Warrier, V., Bast, N., Moessnang, C., Baumeister, S., Dell'Acqua, F., Floris, D.L., Zabihi, M., Marquand, A.F., Cliquet, F., Leblond, C., Moreau, C., Puts, N., Banaschewski, T., Jones, E.J.H., Mason, L., Bölte, S., Meyer-Lindenberg, A., Persico, A.M., Durston, S., Baron-Cohen, S., Spooren, W., Loth, E., Freitag, C.M., Charman, T., Dumas, G., Bourgeron, T., Beckmann, C.F., Buitelaar, J.K., and Murphy, D.G.M.
- Abstract
Contains fulltext : 248865.pdf (Publisher’s version ) (Closed access), OBJECTIVE: Autism spectrum disorder (ASD) is accompanied by highly individualized neuroanatomical deviations that potentially map onto distinct genotypes and clinical phenotypes. This study aimed to link differences in brain anatomy to specific biological pathways to pave the way toward targeted therapeutic interventions. METHODS: The authors examined neurodevelopmental differences in cortical thickness and their genomic underpinnings in a large and clinically diverse sample of 360 individuals with ASD and 279 typically developing control subjects (ages 6-30 years) within the EU-AIMS Longitudinal European Autism Project (LEAP). The authors also examined neurodevelopmental differences and their potential pathophysiological mechanisms between clinical ASD subgroups that differed in the severity and pattern of sensory features. RESULTS: In addition to significant between-group differences in "core" ASD brain regions (i.e., fronto-temporal and cingulate regions), individuals with ASD manifested as neuroanatomical outliers within the neurotypical cortical thickness range in a wider neural system, which was enriched for genes known to be implicated in ASD on the genetic and/or transcriptomic level. Within these regions, the individuals' total (i.e., accumulated) degree of neuroanatomical atypicality was significantly correlated with higher polygenic scores for ASD and other psychiatric conditions, and it scaled with measures of symptom severity. Differences in cortical thickness deviations were also associated with distinct sensory subgroups, especially in brain regions expressing genes involved in excitatory rather than inhibitory neurotransmission. CONCLUSIONS: The study findings corroborate the link between macroscopic differences in brain anatomy and the molecular mechanisms underpinning heterogeneity in ASD, and provide future targets for stratification and subtyping.
- Published
- 2022
46. Stratifying the autistic phenotype using electrophysiological indices of social perception
- Author
-
Mason, L., Moessnang, C., Chatham, C., Ham, L., Tillmann, J., Dumas, G., Ellis, C., Leblond, C.S., Cliquet, F., Bourgeron, T., Beckmann, C.F., Charman, T., Oakley, B., Banaschewski, T., Meyer-Lindenberg, A., Baron-Cohen, S., Bölte, S., Buitelaar, J.K., Durston, S., Loth, E., Oranje, B., Persico, A., Dell'Acqua, F., Ecker, C., Johnson, M.H., Murphy, D., Jones, E.J.H., Mason, L., Moessnang, C., Chatham, C., Ham, L., Tillmann, J., Dumas, G., Ellis, C., Leblond, C.S., Cliquet, F., Bourgeron, T., Beckmann, C.F., Charman, T., Oakley, B., Banaschewski, T., Meyer-Lindenberg, A., Baron-Cohen, S., Bölte, S., Buitelaar, J.K., Durston, S., Loth, E., Oranje, B., Persico, A., Dell'Acqua, F., Ecker, C., Johnson, M.H., Murphy, D., and Jones, E.J.H.
- Abstract
Item does not contain fulltext, Autism spectrum disorder (ASD) is a neurodevelopmental condition characterized by difficulties in social communication, but also great heterogeneity. To offer individualized medicine approaches, we need to better target interventions by stratifying autistic people into subgroups with different biological profiles and/or prognoses. We sought to validate neural responses to faces as a potential stratification factor in ASD by measuring neural (electroencephalography) responses to faces (critical in social interaction) in N = 436 children and adults with and without ASD. The speed of early-stage face processing (N170 latency) was on average slower in ASD than in age-matched controls. In addition, N170 latency was associated with responses to faces in the fusiform gyrus, measured with functional magnetic resonance imaging, and polygenic scores for ASD. Within the ASD group, N170 latency predicted change in adaptive socialization skills over an 18-month follow-up period; data-driven clustering identified a subgroup with slower brain responses and poor social prognosis. Use of a distributional data-driven cutoff was associated with predicted improvements of power in simulated clinical trials targeting social functioning. Together, the data provide converging evidence for the utility of the N170 as a stratification factor to identify biologically and prognostically defined subgroups in ASD.
- Published
- 2022
47. Enhanced specialized metabolite, trichome density, and biosynthetic gene expression in Stevia rebaudiana (Bertoni) Bertoni plants inoculated with endophytic bacteria Enterobacter hormaechei
- Author
-
Oviedo-Pereira, Dumas G., primary, López-Meyer, Melina, additional, Evangelista-Lozano, Silvia, additional, Sarmiento-López, Luis G., additional, Sepúlveda-Jiménez, Gabriela, additional, and Rodríguez-Monroy, Mario, additional
- Published
- 2022
- Full Text
- View/download PDF
48. Atteinte neurologique au cours du purpura thrombotique thrombocytopénique
- Author
-
Mirouse, A., primary, Legriel, S., additional, Dumas, G., additional, Veyradier, A., additional, Zafrani, L., additional, Valade, S., additional, Hourmant, Y., additional, Boutboul, D., additional, Coppo, P., additional, Mariotte, E., additional, and Azoulay, E., additional
- Published
- 2022
- Full Text
- View/download PDF
49. Splash and Spray Measurement and Control: Recent Progress in Quebec
- Author
-
Dumas, G., Lemay, J., Pfeiffer, Friedrich, editor, Wriggers, Peter, editor, McCallen, Rose, editor, Browand, Fred, editor, and Ross, James, editor
- Published
- 2004
- Full Text
- View/download PDF
50. Numerical and experimental comparison of confinement effects on a Fully-Passive Oscillating-Foil Turbine
- Author
-
Gunther, K., Mann, S., Dumas, G., and Oshkai, P.
- Abstract
A numerical and experimental comparison of a fully-passive oscillating-foil turbine operating in different confinement levels is conducted to assert how well CFD-based FSI simulations can predict the performances of the turbine. It is found the present 3D URANS simulations match reasonably well the experimental observations, especially in terms of pitch angles and power extraction. Indeed, the results confirm that confinement increases the extracted power and the efficiency of the fully-passive blade. At low confinement level, the main flow features are shown to be well captured by the simulations. At large confinement levels, some issues with lateral walls interactions are discussed as possible explanation for the observed discrepancies. Part of Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022
- Published
- 2022
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.