Mostrando recursos 1 - 20 de 22

  1. Jonctions SIS en Nb/Al2O3/Nb pour des récepteurs en radioastronomie millimétrique et submillimétrique

    Feautrier, Philippe

  2. Conception d'un Convertisseur Analogique-Numérique pour des Applications en Radioastronomie et Cosmologie

    Rossoni Mattos, Diego; Begueret, Jean-Baptiste; Baudry, Alain
    International audience

  3. Histoire et développement de la radioastronomie solaire en France : 1945-1990

    De La Noe, J.

  4. Histoire et développement de la radioastronomie solaire en France : 1945-1990

    De La Noe, J.

  5. Approches spatiales cyclostationnaires pour le traitement des interférences en radioastronomie

    Hellbourg, Gregory; Weber, Rodolphe; Capdessus, Cécile; Boonstra, Albert-Jan; Feliachi, Rym
    National audience

  6. Exemples de traitement en temps réel des interférences radioélectriques pour la radioastronomie

    Weber, Rodolphe; Dumez-Viou, Cedric; Changuel, Samar; Ait-Allal, Dalal
    National audience

  7. La RadioAstronomie pour Tous

    Cais, Ph.; D'Anna, W.; Quertier, Benjamin; Herpin, Fabrice
    Le Laboratoire d'Astrophysique de Bordeaux (anciennement Observatoire de Bordeaux) est doté sur son site d'un radiotélescope Würzburg de 7.5m de diamètre, utilisé dans le domaine de la radioastronomie. Cet instrument, ancien radar de la deuxième guerre mondiale, a été utilisé à l'Observatoire de Bordeaux à partir des années 1960 pour des observations solaires routinières à la fréquence de 930MHz. Abandonné dans les années 1990, le radiotélescope est maintenant rénové et ouvert au grand public depuis Mai 2011. Un système électronique nouveau et un programme informatique développé en Python permettent de pointer l'antenne, de détecter et d'analyser le signal radio émis...

  8. Interfaz gráfica para la correlación de señales radioastronómicas

    Acuña Escobar, Ana Carolina
    El reciente trabajo de investigación, tuvo como objeto fundamental el desarrollo y posterior implementación de una interfaz gráfica para la correlación de señales radioastronómicas. En el presente documento, se hará un recorrido por la historia de la radioastromía e interferometría, se mostrarán las partes del radiotelescopio y se describirá paso a paso el camino que recorre una señal de una radiofuente al ser captada por uno. Al ser insuficiente la resolución de un solo telescopio, se introducirá la técnica de interferometría y los grandes avances que ha traído a la astronomía debido a su gran nivel de detalle en sus...

  9. Shocked POststarburst Galaxy Survey II: The Molecular Gas Content and Properties of a Subset of SPOGs

    Alatalo, Katherine; Lisenfeld, Ute; Lanz, Lauranne; Appleton, Philip N.; Ardila, Felipe; Cales, Sabrina L.; Kewley, Lisa J.; Lacy, Mark; Medling, Anne M.; Nyland, Kristina; Rich, Jeffrey A.; Urry, C. Megan
    We present CO(1–0) observations of objects within the Shocked POststarburst Galaxy Survey taken with the Institut de Radioastronomie Millimétrique 30 m single dish and the Combined Array for Research for Millimeter Astronomy interferometer. Shocked poststarburst galaxies (SPOGs) represent a transitioning population of galaxies, with deep Balmer absorption (EW_(Hδ)>5 Å, consistent with an intermediate-age (A-star) stellar population, and ionized gas line ratios inconsistent with pure star formation. The CO(1–0) subsample was selected from SPOGs detected by the Wide-field Infrared Survey Explorer with 22 μm flux detected at a signal-to-noise ratio (S/N) > 3. Of the 52 objects observed in CO(1–0), 47...

  10. Shocked POststarburst Galaxy Survey II: The Molecular Gas Content and Properties of a Subset of SPOGs

    Alatalo, Katherine; Lisenfeld, Ute; Lanz, Lauranne; Appleton, Philip N.; Ardila, Felipe; Cales, Sabrina L.; Kewley, Lisa J.; Lacy, Mark; Medling, Anne M.; Nyland, Kristina; Rich, Jeffrey A.; Urry, C. Megan
    We present CO(1–0) observations of objects within the Shocked POststarburst Galaxy Survey taken with the Institut de Radioastronomie Millimétrique 30 m single dish and the Combined Array for Research for Millimeter Astronomy interferometer. Shocked poststarburst galaxies (SPOGs) represent a transitioning population of galaxies, with deep Balmer absorption (EW_(Hδ)>5 Å, consistent with an intermediate-age (A-star) stellar population, and ionized gas line ratios inconsistent with pure star formation. The CO(1–0) subsample was selected from SPOGs detected by the Wide-field Infrared Survey Explorer with 22 μm flux detected at a signal-to-noise ratio (S/N) > 3. Of the 52 objects observed in CO(1–0), 47...

  11. Shocked POststarburst Galaxy Survey II: The Molecular Gas Content and Properties of a Subset of SPOGs

    Alatalo, Katherine; Lisenfeld, Ute; Lanz, Lauranne; Appleton, Philip N.; Ardila, Felipe; Cales, Sabrina L.; Kewley, Lisa J.; Lacy, Mark; Medling, Anne M.; Nyland, Kristina; Rich, Jeffrey A.; Urry, C. Megan
    We present CO(1–0) observations of objects within the Shocked POststarburst Galaxy Survey taken with the Institut de Radioastronomie Millimétrique 30 m single dish and the Combined Array for Research for Millimeter Astronomy interferometer. Shocked poststarburst galaxies (SPOGs) represent a transitioning population of galaxies, with deep Balmer absorption (EW_(Hδ)>5 Å, consistent with an intermediate-age (A-star) stellar population, and ionized gas line ratios inconsistent with pure star formation. The CO(1–0) subsample was selected from SPOGs detected by the Wide-field Infrared Survey Explorer with 22 μm flux detected at a signal-to-noise ratio (S/N) > 3. Of the 52 objects observed in CO(1–0), 47...

  12. Excitation Mechanisms for HCN (1-0) and HCO+ (1-0) in Galaxies from the Great Observatories All-sky LIRG Survey

    Privon, G. C.; Herrero-Illana, R.; Evans, A. S.; Iwasawa, K.; Pérez-Torres, M. A.; Armus, L.; Díaz-Santos, T.; Murphy, E. J.; Stierwalt, S.; Aalto, S.; Mazzarella, J. M.; Barcos-Muñoz, L.; Borish, H. J.; Inami, H.; Kim, D.-C.; Treister, E.; Surace, J. A.; Lord, S.; Conway, J.; Frayer, D. T.; Alberdi, A.
    We present new Institut de Radioastronomie Millimétrique (IRAM) 30 m spectroscopic observations of the ~88 GHz band, including emission from the CCH (N = 1 → 0) multiplet, HCN (J = 1 → 0), HCO^+ (J = 1 → 0), and HNC(J = 1 → 0), for a sample of 58 local luminous and ultraluminous infrared galaxies from the Great Observatories All-sky LIRG Survey (GOALS). By combining our new IRAM data with literature data and Spitzer/IRS spectroscopy, we study the correspondence between these putative tracers of dense gas and the relative contribution of active galactic nuclei (AGNs) and star formation...

  13. Excitation Mechanisms for HCN (1-0) and HCO+ (1-0) in Galaxies from the Great Observatories All-sky LIRG Survey

    Privon, G. C.; Herrero-Illana, R.; Evans, A. S.; Iwasawa, K.; Pérez-Torres, M. A.; Armus, L.; Díaz-Santos, T.; Murphy, E. J.; Stierwalt, S.; Aalto, S.; Mazzarella, J. M.; Barcos-Muñoz, L.; Borish, H. J.; Inami, H.; Kim, D.-C.; Treister, E.; Surace, J. A.; Lord, S.; Conway, J.; Frayer, D. T.; Alberdi, A.
    We present new Institut de Radioastronomie Millimétrique (IRAM) 30 m spectroscopic observations of the ~88 GHz band, including emission from the CCH (N = 1 → 0) multiplet, HCN (J = 1 → 0), HCO^+ (J = 1 → 0), and HNC(J = 1 → 0), for a sample of 58 local luminous and ultraluminous infrared galaxies from the Great Observatories All-sky LIRG Survey (GOALS). By combining our new IRAM data with literature data and Spitzer/IRS spectroscopy, we study the correspondence between these putative tracers of dense gas and the relative contribution of active galactic nuclei (AGNs) and star formation...

  14. Excitation Mechanisms for HCN (1-0) and HCO+ (1-0) in Galaxies from the Great Observatories All-sky LIRG Survey

    Privon, G. C.; Herrero-Illana, R.; Evans, A. S.; Iwasawa, K.; Pérez-Torres, M. A.; Armus, L.; Díaz-Santos, T.; Murphy, E. J.; Stierwalt, S.; Aalto, S.; Mazzarella, J. M.; Barcos-Muñoz, L.; Borish, H. J.; Inami, H.; Kim, D.-C.; Treister, E.; Surace, J. A.; Lord, S.; Conway, J.; Frayer, D. T.; Alberdi, A.
    We present new Institut de Radioastronomie Millimétrique (IRAM) 30 m spectroscopic observations of the ~88 GHz band, including emission from the CCH (N = 1 → 0) multiplet, HCN (J = 1 → 0), HCO^+ (J = 1 → 0), and HNC(J = 1 → 0), for a sample of 58 local luminous and ultraluminous infrared galaxies from the Great Observatories All-sky LIRG Survey (GOALS). By combining our new IRAM data with literature data and Spitzer/IRS spectroscopy, we study the correspondence between these putative tracers of dense gas and the relative contribution of active galactic nuclei (AGNs) and star formation...

  15. Excitation Mechanisms for HCN (1-0) and HCO+ (1-0) in Galaxies from the Great Observatories All-sky LIRG Survey

    Privon, G. C.; Herrero-Illana, R.; Evans, A. S.; Iwasawa, K.; Pérez-Torres, M. A.; Armus, L.; Díaz-Santos, T.; Murphy, E. J.; Stierwalt, S.; Aalto, S.; Mazzarella, J. M.; Barcos-Muñoz, L.; Borish, H. J.; Inami, H.; Kim, D.-C.; Treister, E.; Surace, J. A.; Lord, S.; Conway, J.; Frayer, D. T.; Alberdi, A.
    We present new Institut de Radioastronomie Millimétrique (IRAM) 30 m spectroscopic observations of the ~88 GHz band, including emission from the CCH (N = 1 → 0) multiplet, HCN (J = 1 → 0), HCO^+ (J = 1 → 0), and HNC(J = 1 → 0), for a sample of 58 local luminous and ultraluminous infrared galaxies from the Great Observatories All-sky LIRG Survey (GOALS). By combining our new IRAM data with literature data and Spitzer/IRS spectroscopy, we study the correspondence between these putative tracers of dense gas and the relative contribution of active galactic nuclei (AGNs) and star formation...

  16. Excitation Mechanisms for HCN (1-0) and HCO+ (1-0) in Galaxies from the Great Observatories All-sky LIRG Survey

    Privon, G. C.; Herrero-Illana, R.; Evans, A. S.; Iwasawa, K.; Pérez-Torres, M. A.; Armus, L.; Díaz-Santos, T.; Murphy, E. J.; Stierwalt, S.; Aalto, S.; Mazzarella, J. M.; Barcos-Muñoz, L.; Borish, H. J.; Inami, H.; Kim, D.-C.; Treister, E.; Surace, J. A.; Lord, S.; Conway, J.; Frayer, D. T.; Alberdi, A.
    We present new Institut de Radioastronomie Millimétrique (IRAM) 30 m spectroscopic observations of the ~88 GHz band, including emission from the CCH (N = 1 → 0) multiplet, HCN (J = 1 → 0), HCO^+ (J = 1 → 0), and HNC(J = 1 → 0), for a sample of 58 local luminous and ultraluminous infrared galaxies from the Great Observatories All-sky LIRG Survey (GOALS). By combining our new IRAM data with literature data and Spitzer/IRS spectroscopy, we study the correspondence between these putative tracers of dense gas and the relative contribution of active galactic nuclei (AGNs) and star formation...

  17. Complex organic molecules in comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy): detection of ethylene glycol and formamide

    Biver, N.; Bockelée-Morvan, D.; Debout, V.; Crovisier, J.; Lis, D. C.; Dello Russo, N.; Moreno, R.; Colom, P.; Paubert, G.; Vervack, R.; Weaver, H. A.
    A spectral survey in the 1 mm wavelength range was undertaken in the long-period comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy) using the 30 m telescope of the Institut de radioastronomie millimétrique (IRAM) in April and November−December 2013. We report the detection of ethylene glycol (CH_2OH)_2 (aGg’ conformer) and formamide (NH_2CHO) in the two comets. The abundances relative to water of ethylene glycol and formamide are 0.2–0.3% and 0.02% in the two comets, similar to the values measured in comet C/1995 O1 (Hale-Bopp). We also report the detection of HCOOH and CH_3CHO in comet C/2013 R1 (Lovejoy), and a...

  18. Desarrollo y aplicaciones de radares de alta resolución en bandas milimétricas

    Mencía Oliva, Beatriz
    Las bandas de las denominadas ondas milimétricas y submilimétricas están situadas en la región del espectro entre las microondas y el infrarrojo. La banda de milimétricas se sitúa entre 30 y 300 GHz, considerada normalmente como la banda EHF (Extremely High Frequency). El margen de frecuencias entre 300 y 3000 GHz es conocido como la banda de ondas submilimétricas o de terahercios (THz). Sin embargo, no toda la comunidad científica está de acuerdo acerca de las frecuencias que limitan la banda de THz. De hecho, 100 GHz y 10 THz son considerados comúnmente como los límites inferior y superior de...

  19. The evolutionary connection between QSOs and SMGs: molecular gas in far-infrared luminous QSOs at z ∼ 2.5

    Simpson, J. M.; Riechers, D. A.
    We present Institut de Radioastronomie Millimétrique Plateau de Bure Interferometer observations of the ^(12)CO (3–2) emission from two far-infrared luminous QSOs at z ∼ 2.5 selected from the Herschel-Astrophysical Tetrahertz Large Area Survey. These far-infrared bright QSOs were selected to have supermassive black holes (SMBHs) with masses similar to those thought to reside in submillimetre galaxies (SMGs) at z ∼ 2.5, making them ideal candidates as systems in the potential transition from an ultraluminous infrared galaxy phase to a submillimetre faint, unobscured, QSO. We detect ^(12)CO (3–2) emission from both QSOs and we compare their baryonic, dynamical and SMBH masses to those...

  20. A search for pre-substellar cores and proto-brown dwarf candidates in Taurus: multiwavelength analysis in the B213-L1495 clouds

    Palau, Aina; de Gregorio-Monsalvo, I.; Morata, Ò; Stamatellos, D.; Huélamo, N.; Eiroa, C.; Bayo, A.; Morales-Calderón, M.; Bouy, H.; Ribas, Á.; Asmus, D.; Barrado, D.
    In an attempt to study whether the formation of brown dwarfs (BDs) takes place as a scaled-down version of low-mass stars, we conducted Institut de Radioastronomie Millimetrique (IRAM) 30 m/MAMBO-II observations at 1.2 mm in a sample of 12 proto-BD candidates selected from Spitzer/IRAC data in the B213-L1495 clouds in Taurus. Subsequent observations with the Caltech Submillimetre Observatory at 350 μm, Very Large Array at 3.6 and 6 cm, and IRAM 30 m/EMIR in the ^(12)CO (1–0), ^(13)CO (1–0) and N_(2)H^+ (1–0) transitions were carried out towards the two most promising Spitzer/IRAC source(s), J042118 and J041757. J042118 is associated with a compact (<10 arcsec or <1400 au) and faint source at...

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