Now showing items 18463-18482 of 19091

    • VLA Imaging of the Intriguing H I Cloud HIJASS J1021 6842 in the M81 Group 

      Walter, F.; Skillman, E.D.; Brinks, E. (2005-07)
    • VLBI observations of TTauri South 

      Smith, K.; Pestalozzi, M.; Guedel, M.; Conway, J.; Benz, A.O. (2003-06)
      We report observations of the T Tauri system at 8.4 GHz with a VLBI array comprising the VLBA, VLA and E elsberg 100 m telescopes. We detected a compact source o set approximately 40 mas from the best infrared position of ...
    • VLBI observations of two single dMe stars: spatial resolution and astrometry 

      Pestalozzi, M.; Benz, A.O.; Conway, J.; Gudel, M. (2000)
      We report on 3.6 cm VLA and VLBA observations of YZ CMi and AD Leo, two nearby dMe stars. We resolve YZ CMi and can fit a circular symmetrical gaussian component of FWHP of 0.98 0.2 mas, corresponding to an extent of the ...
    • VLT integral field spectroscopy of embedded protostars : using near-infrared emission lines as tracers of accretion and outflow 

      Davis, C.J.; Cervantes, B.; Nisini, B.; Giannini, T.; Takami, M.; Whelan, E.; Smith, M.D.; Ray, T.P.; Chrysostomou, A.; Pyo, T.S. (2011-04-01)
      Aims. We present near-infrared spectroscopy of the forbidden emission line (FEL) and molecular hydrogen emission line (MHEL) regions at the bases of Herbig-Haro (HH) jets from seven embedded protostars: SVS 13 (the HH 7-11 ...
    • VLT/XSHOOTER and Subaru/MOIRCS spectroscopy of HUDF.YD3 : no evidence for Lyman α emission at z = 8.55 

      Bunker, Andrew J.; Caruana, Joseph; Wilkins, Stephen M.; Stanway, Elizabeth R.; Lorenzoni, Silvio; Lacy, Mark; Jarvis, M.J.; Hickey, Samantha (2013-04-21)
      We present spectroscopic observations with VLT/XSHOOTER and Subaru/MOIRCS of a relatively bright Y-band drop-out galaxy in the Hubble Ultra Deep Field (HUDF), first selected by Bunker et al., McLure et al. and Bouwens et ...
    • The VMC survey - IX : Pilot study of the proper motion of stellar populations in the LMC from 2MASS and VISTA data 

      Cioni, M-R.L.; Giradi, L.; Moretti, M.I.; Piffl, T.; Ripepi, V.; Rubele, S.; Scholz, R.D.; Bekki, K.; Clementini, G.; Ivanov, V.D.; Oliveira, J.M.; van Loon, J. Th (2014-02)
      Proper motion (PM) studies are fundamental ingredients in the understanding of the orbital history of galaxies. Current measurements do not yet provide a satisfactory answer to the possible scenarios for the formation and ...
    • The VMC survey - V : First results for classical Cepheids 

      Ripepi, V.; Moretti, M.I.; Marconi, M.; Clementini, G.; Cioni, M-R.L.; Marquette, J-B.; Girardi, L.; Rubele, S.; Groenewegen, M.A.T.; de Grijs, R.; Gibson, B. K.; Oliveira, J.M.; van Loon, J. Th; Emerson, J.P. (2012-08)
      The VISTA Magellanic Cloud (VMC; PI: M.-R. L. Cioni) survey is collecting deep Ks-band time series photometry of the pulsating variable stars hosted by the system formed by the two Magellanic Clouds (MCs) and the bridge ...
    • The VMC survey - VII : Reddening map of the 30 Doradus field and the structure of the cold interstellar medium 

      Tatton, B.; van Loon, J. Th; Cioni, M-R.L.; Clementini, G.; Emerson, J.P.; Girardi, L.; de Grijs, R.; Groenewegen, M.A.T.; Gullieuszik, M.; Ivanov, V.D.; Moretti, M.I.; Ripepi, V.; Rubele, S. (2013-06)
      The details of how galaxies have evolved over cosmological times are imprinted in their star formation history, chemical enrichment and morpho-kinematic structure. Parameters behind these, such as effective temperature and ...
    • The VMC survey - VIII : First results for anomalous Cepheids 

      Ripepi, V.; Marconi, M.; Moretti, M.I.; Clementini, G.; Cioni, M-R.L.; de Grijs, R.; Emerson, J.P.; Groenewegen, M.A.T.; Ivanov, V.D.; Oliveira, J.M. (2014-01-21)
      The VISTA near-infrared YJKs survey of the Magellanic Clouds System (VMC, PI M.-R. L. Cioni) is collecting deep Ks-band time-series photometry of the pulsating variable stars hosted in the system formed by the two Magellanic ...
    • The VMC survey - X : The technique of using Cepheids, RR Lyrae stars and binaries to probe the Magellanic system structure 

      Moretti, M.I.; Clementini, G.; Tatiana, Muraveva; Ripepi, V.; Marquette, J-B.; Cioni, M-R.L.; Marconi, M.; Girardi, L.; Rubele, S.; Tisserand, P.; de Grijs, R.; Groenewegen, M.A.T.; Guandalini, Roald; Ivanov, V.D.; van Loon, J. Th (2014-01)
      The VISTA near-infrared Y, J, Ks survey of the Magellanic System (VMC) survey is obtaining multi-epoch photometry in the Ks band of the Magellanic System down to a limiting magnitude of Ks~19.3 for individual epoch data. ...
    • The VMC survey - XI : Radial Stellar Population Gradients in the Galactic Globular Cluster 47 Tucanae 

      Chengyan, Li; de Grijs, R.; Deng, Licai; Rubele, S.; Wang, Chuchu; Bekki, K.; Cioni, M-R.L.; Clementini, G.; Emerson, J.P.; For, Bi-Qing; Girardi, L.; Groenewegen, M.A.T.; Guandalini, Roald; Gullieuszik, M.; Marconi, M.; Piatti, Andres; Ripepi, V.; van Loon, J. Th. (2014-07)
      We present a deep near-infrared color-magnitude diagram of the Galactic globular cluster 47 Tucanae, obtained with the Visible and Infrared Survey Telescope for Astronomy (VISTA) as part of the VISTA near-infrared Y, J, ...
    • The VMC survey - XII : Star cluster candidates in the large magellanic cloud 

      Piatti, Andrés E.; Guandalini, Roald; Ivanov, Valentin D.; Rubele, Stefano; Cioni, M-R.L.; De Grijs, Richard; For, Bi Qing; Clementini, Gisella; Ripepi, Vincenzo; Anders, Peter; Oliveira, Joana M. (2014-10)
      In this work we analyse colour-magnitude diagrams (CMDs) of catalogued star clusters located in the Large Magellanic Cloud (LMC), from a YJKs photometric data set obtained by the Visible and Infrared Survey Telescope for ...
    • The VMC Survey - XIII : Type II Cepheids in the Large Magellanic Cloud 

      Ripepi, V.; Moretti, M.I.; Marconi, M.; Clementini, G.; Cioni, M-R.L.; de Grijs, R.; Emerson, J.P.; Groenewegen, M.A.T.; Ivanov, Valentin D.; Muraveva, T.; Piatti, A.E.; Subramanian, S. (2015-01-21)
      The VISTA (Visible and Infrared Survey Telescope for Astronomy) survey of the Magellanic Clouds System (VMC) is collecting deep Ks-band time-series photometry of the pulsating variable stars hosted in the system formed by ...
    • The VMC survey - XIV : First results on the look-back time star formation rate tomography of the Small Magellanic Cloud 

      Rubele, S.; Girardi, L.; Kerber, L.; Cioni, M-R.L.; Piatti, A.E.; Zaggia, S.; Bekki, K.; Bressan, A.; Clementini, G.; de Grijs, R.; Emerson, J.P.; Groenewegen, M.A.T.; Ivanov, Valentin D.; Marconi, M.; Marigo, P.; Moretti, M.I.; Ripepi, V.; Subramanian, S.; Tatton, B.L.; van Loon, J. Th (2015-05-01)
      We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJKs filters, covering 14 deg2 (10 tiles), split into 120 subregions, and comprising the main body and Wing of the Small Magellanic Cloud (SMC). ...
    • The VMC survey - XV : The Small Magellanic Cloud-Bridge connection history as traced by their star cluster populations 

      Piatti, A.E.; de Grijs, R.; Rubele, S.; Cioni, M-R.L.; Ripepi, V.; Kerber, L. (2015-06-11)
      We present results based on YJKs photometry of star clusters located in the outermost, eastern region of the Small Magellanic Cloud (SMC). We analysed a total of 51 catalogued clusters whose colour-magnitude diagrams (CMDs), ...
    • The VMC survey - XVI : Spatial variation of the cluster-formation activity in the innermost regions of the Large Magellanic Cloud 

      Piatti, Andrés E.; De Grijs, Richard; Ripepi, V.; Ivanov, Valentin D.; Cioni, M-R.L.; Marconi, M.; Rubele, S.; Bekki, K.; For, Bi-Qing (2015-11-21)
      We present results based on YJKs photometry of star clusters in the Large Magellanic Cloud (LMC), distributed throughout the central part of the galaxy's bar and the 30 Doradus region. We analysed the field-star-decontaminated ...
    • The VMC survey - XVII : The proper motions of the Small Magellanic Cloud and the Milky Way globular cluster 47 Tucanae 

      Cioni, M-R.L.; Bekki, K.; Girardi, L.; De Grijs, Richard; Irwin, M.; Ivanov, Valentin D.; Marconi, M.; Oliveira, Joana M.; Piatti, Andrés E.; Ripepi, V.; van Loon, J. Th (2016-01-28)
      In this study we use multi-epoch near-infrared observations from the VISTA survey of the Magellanic Cloud system (VMC) to measure the proper motion of different stellar populations in a tile of 1.5 deg sq. in size in the ...
    • The VMC survey - XVIII : Radial dependence of the low-mass, 0.57-0.82 Msun stellar mass function in the galactic globular cluster 47 Tucanae 

      Chaoli, Zhang; Li, Chengyuan; De Grijs, Richard; Bekki, K.; Deng, Licai; Zaggia, S.; Rubele, S.; Piatti, Andrés E.; Cioni, M-R.L.; Emerson, J.P.; For, Bi-Qing; Ripepi, V.; Marconi, Marcella; Ivanov, Valentin D.; Chen, Li (2015-12-14)
      We use near-infrared observations obtained as part of the Visible and Infrared Survey Telescope for Astronomy (VISTA) Survey of the Magellanic Clouds (VMC), as well as two complementary Hubble Space Telescope (HST) data ...
    • The VMC survey - XX. Identification of new Cepheids in the Small Magellanic Cloud 

      Moretti, M. I.; Clementini, G.; Ripepi, V.; Marconi, M.; Rubele, S.; Cioni, M. R L; Muraveva, T.; Groenewegen, M. A T; Cross, N. J G; Ivanov, V. D.; Piatti, A. E.; de Grijs, R. (2016-06-21)
      We present Ks-band light curves for 299 Cepheids in the Small Magellanic Cloud (SMC) of which 288 are new discoveries that we have identified using multi-epoch near-infrared photometry obtained by the VISTA survey of the ...
    • The VMC Survey - XXI. New star cluster candidates discovered from infrared photometry in the Small Magellanic Cloud 

      Piatti, Andrés E.; Ivanov, Valentin D.; Rubele, Stefano; Marconi, Marcella; Ripepi, Vincenzo; Cioni, Maria Rosa L; Oliveira, Joana M.; Bekki, Kenji (2016-07-21)
      We report the first search for new star clusters performed using the VISTA near-infrared YJKs Magellanic Clouds survey (VMC) data sets. We chose a pilot field of ~0.4 deg2 located in the South-west of the Small Magelllanic ...