Browsing University of Hertfordshire by Title

Now showing items 23295-23314 of 24104

    • VLA and ALMA IMAGING of INTENSE GALAXY-WIDE STAR FORMATION in z ∼ 2 GALAXIES 

      Rujopakarn, W.; Dunlop, J. S.; Rieke, G. H.; Ivison, R. J.; Cibinel, A.; Nyland, K.; Jagannathan, P.; Silverman, J. D.; Alexander, D. M.; Biggs, A. D.; Bhatnagar, S.; Ballantyne, D. R.; Dickinson, M.; Elbaz, D.; Geach, J. E.; Hayward, C. C.; Kirkpatrick, A.; McLure, R. J.; Michałowski, M. J.; Miller, N. A.; Narayanan, D.; Owen, F. N.; Pannella, M.; Papovich, C.; Pope, A.; Rau, U.; Robertson, B. E.; Scott, D.; Swinbank, A. M.; Werf, P. Van Der; Kampen, E. Van; Weiner, B. J.; Windhorst, R. A. (2016-12-01)
      We present ≃0.″4 resolution extinction-independent distributions of star formation and dust in 11 star-forming galaxies (SFGs) at z = 1.3-3.0. These galaxies are selected from sensitive blank-field surveys of the 2′ ×2′ ...

    • VLA cm-wave survey of young stellar objects in the Oph A cluster : constraining extreme UV- and X-ray-driven disk photo-evaporation -- A pathfinder for Square Kilometre Array studies 

      Coutens, A.; Liu, H. B.; Jiménez-Serra, I.; Bourke, T. L.; Forbrich, J.; Hoare, M.; Loinard, L.; Testi, L.; Audard, M.; Caselli, P.; Chacón-Tanarro, A.; Codella, C.; Francesco, J. Di; Fontani, F.; Hogerheijde, M.; Johansen, A.; Johnstone, D.; Maddison, S.; Panić, O.; Pérez, L. M.; Podio, L.; Punanova, A.; Rawlings, J. M. C.; Semenov, D.; Tazzari, M.; Tobin, J. J.; Wiel, M. H. D. van der; Langevelde, H. J. van; Vlemmings, W.; Wilner, D. (2019-10-21)
      Observations of young stellar objects (YSOs) in centimeter bands can probe the continuum emission from growing dust grains, ionized winds, and magnetospheric activity, which are intimately connected to the evolution of ...

    • VLA H I Line Observations of the Extremely Metal-Poor Blue Compact Dwarf Galaxy SBS 0335-052 

      Pustilnik, S.A.; Brinks, E.; Thuan, T.X.; Lipovetsky, V.A.; Izotov, Y.I. (2001-03)

    • VLA HI imaging of the Low Surface Brightness dwarf galaxy DDO47 

      Walter, F.; Brinks, E. (Astronomical Society of the Pacific, 1999)
      We present high resolution VLA-observations of the nearby Low Surface Brightness Galaxy DDO 47. This object shows many hole-like structures in its neutral interstellar medium. The majority of the detected H I-shells are ...

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

      Walter, F.; Skillman, E.D.; Brinks, E. (2005-07)

    • A VLBA Survey of radio stars in the Orion Nebula Cluster: I. The nonthermal radio population 

      Forbrich, Jan; Dzib, Sergio A.; Reid, Mark J.; Menten, Karl M. (2021-01-04)
      We present first results of a four-epoch VLBA survey for nonthermal emission toward all 556 compact radio sources previously identified in a deep VLA survey of the Orion Nebula Cluster (ONC). We identify VLBA counterparts ...

    • A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry 

      Dzib, Sergio A.; Forbrich, Jan; Reid, Mark J.; Menten, Karl M. (2021-01-04)
      From Very Long Baseline Array (VLBA) observations we previously identified a population of 123 young stellar systems with nonthermal radio emission toward the core of the Orion Nebula Cluster (ONC). We find optical sources ...

    • 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). ...