Browsing University of Hertfordshire by Title

Now showing items 9086-9105 of 24104

    • The G305 star-forming complex : radio continuum and molecular line observations 

      Hindson, Luke; Thompson, Mark; Urquhart, J.S.; Faimali, Alessandro; Johnston-Hollitt, M.; Clark, J. S.; Davies, B. (2013-11-01)
      We present 109–115 GHz (3 mm) wide-field spectral line observations of 12CO, 13CO and C18O J = 1–0 molecular emission and 5.5 and 8.8 GHz (6 and 3 cm) radio continuum emission towards the high-mass star-forming complex ...

    • The G305 star-forming complex : the central star clusters Danks 1 and Danks 2 

      Davies, B.; Clark, J.S.; Trombley, C.; Figer, D. F.; Najarro, F.; Crowther, P.A.; Kudritzki, R.P.; Thompson, M.; Urquhart, J.S.; Hindson, Luke (2012)
      The G305 H ii complex (G305.4+0.1) is one of the most massive star-forming structures yet identified within the Galaxy. It is host to many massive stars at all stages of formation and evolution, from embedded molecular ...

    • The G305 star-forming complex : wide-area molecular mapping of NH3 and H2O masers 

      Hindson, Luke; Thompson, M.A.; Urquhart, J.S.; Clark, J.S.; Davies, B. (2010)
      We present wide-area radio (12 mm) Mopra telescope observations of the complex and rich massive star-forming region G305. Our goals are to determine the reservoir for star formation within G305 using NH3 to trace the dense ...

    • Ga(III) complexes-The effect of metal coordination on potential systemic absorption after topical exposure 

      Staff, Kirsten; Brown, Marc; Chilcott, Robert; Hider, Robert C.; Jones, Stuart A.; Kong, Xiao L. (2011-05-10)
      The handling of elemental gallium is not thought to be harmful, but this assumption does not consider metal coordination which readily occurs in physiological fluids. The aim of this work was to determine Ga(III) coordination ...

    • GA-NIFS: A massive black hole in a low-metallicity AGN at z ∼ 5.55 revealed by JWST/NIRSpec IFS 

      Übler, Hannah; Maiolino, Roberto; Curtis-Lake, Emma; Pérez-González, Pablo G.; Curti, Mirko; Perna, Michele; Arribas, Santiago; Charlot, Stéphane; Marshall, Madeline A.; D'Eugenio, Francesco; Scholtz, Jan; Bunker, Andrew; Carniani, Stefano; Ferruit, Pierre; Jakobsen, Peter; Rix, Hans-Walter; Pino, Bruno Rodríguez Del; Willott, Chris J.; Böker, Torsten; Cresci, Giovanni; Jones, Gareth C.; Kumari, Nimisha; Rawle, Tim (2023-09-18)
      We present rest-frame optical data of the compact z=5.55 galaxy GS_3073 obtained using the integral field spectroscopy mode of the Near-InfraRed Spectrograph on board the James Webb Space Telescope. The galaxybs prominent ...

    • GA-NIFS: Black hole and host galaxy properties of two z-6.8 quasars from the NIRSpec IFU 

      Marshall, Madeline A.; Perna, Michele; Willott, Chris J.; Maiolino, Roberto; Scholtz, Jan; Übler, Hannah; Carniani, Stefano; Arribas, Santiago; Lützgendorf, Nora; Bunker, Andrew J.; Charlot, Stephane; Ferruit, Pierre; Jakobsen, Peter; Rix, Hans-Walter; Pino, Bruno Rodríguez Del; Böker, Torsten; Cameron, Alex J.; Cresci, Giovanni; Curtis-Lake, Emma; Jones, Gareth C.; Kumari, Nimisha; Pérez-González, Pablo G.; Reed, Sophie L. (2023-10-20)
      Aims. Integral field spectroscopy (IFS) with JWST NIRSpec will significantly improve our understanding of the first quasars, by providing spatially resolved, infrared spectroscopic capabilities that cover key rest-frame ...

    • Gaeumannomyces graminis, the take-all fungus and its relatives 

      Freeman, J.; Ward, Elaine (2004-07)
      Take-all, caused by the fungus Gaeumannomyces graminis var. tritici, is the most important root disease of wheat worldwide. Many years of intensive research, reflected by the large volume of literature on take-all, has led ...

    • The Gaia -ESO Survey : Empirical determination of the precision of stellar radial velocities and projected rotation velocities 

      Jackson, R. J.; Jeffries, R.D.; Lewis, J.; Koposov, S. E.; Sacco, G. G.; Randich, S.; Gilmore, G.; Asplund, M.; Binney, J.; Bonifacio, P.; Drew, J.E.; Feltzing, S.; Ferguson, A.M.N.; Micela, G.; Neguerela, I.; Prusti, T.; Rix, H-W.; Vallenari, A.; Alfaro, E. J.; Allende Prieto, C.; Babusiaux, C.; Bensby, T.; Blomme, R.; Bragaglia, A.; Flaccomio, E.; Francois, P.; Hambly, N.; Irwin, M.; Korn, A.J.; Lanzafame, A. C.; Pancino, E.; Recio-Blanco, A.; Smiljanic, R.; Van Eck, S.; Walton, N.; Bayo, A.; Bergemann, M.; Carraro, G.; Costado, M. T.; Damiani, F.; Edvardsson, B.; Franciosini, E.; Frasca, A.; Heiter, U.; Hill, V.; Hourihane, A.; Jofré, P.; Lardo, C.; De Laverny, P.; Lind, K.; Magrini, L.; Marconi, G.; Martayan, C.; Masseron, T.; Monaco, L.; Morbidelli, L.; Prisinzano, L.; Sbordone, L.; Sousa, S.G.; Worley, C. C.; Zaggia, S. (2015-08)
      Context. The Gaia-ESO Survey (GES) is a large public spectroscopic survey at the European Southern Observatory Very Large Telescope. Aims. A key aim is to provide precise radial velocities (RVs) and projected equatorial ...

    • Gaia GraL: Gaia DR2 gravitational lens systems – VIII. A radio census of lensed systems 

      Dobie, Dougal; Sluse, Dominique; Deller, Adam; Murphy, Tara; Krone-Martins, Alberto; Stern, Daniel; Wang, Ziteng; Wang, Yuanming; Bœhm, Céline; Djorgovski, S G; Galluccio, Laurent; Delchambre, Ludovic; Connor, Thomas; den Brok, Jakob Sebastiaan; Do Vale Cunha, Pedro H; Ducourant, Christine; Graham, Matthew J; Jalan, Priyanka; Klioner, Sergei A; Klüter, Jonas; Mignard, François; Negi, Vibhore; Petit, Quentin; Scarano Sergio, Jr; Slezak, Eric; Surdej, Jean; Teixeira, Ramachrisna; Walton, Dominic J; Wambsganss, Joachim (2024-03-01)
      We present radio observations of 24 confirmed and candidate strongly lensed quasars identified by the Gaia Gravitational Lenses working group. We detect radio emission from eight systems in 5.5 and 9 GHz observations with ...

    • Gaia GraL: Gaia DR2 Gravitational Lens Systems. VII. XMM-Newton Observations of Lensed Quasars 

      Connor, Thomas; Stern, Daniel; Krone-Martins, Alberto; Djorgovski, S. G.; Graham, Matthew J.; Walton, Dominic J.; Delchambre, Ludovic; Ducourant, Christine; Teixeira, Ramachrisna; Campion, Jean-François Le; Brok, Jakob Sebastian den; Dobie, Dougal; Galluccio, Laurent; Jalan, Priyanka; Klioner, Sergei A.; Klüter, Jonas; Mahabal, Ashish A.; Negi, Vibhore; Nierenberg, Anna; Petit, Quentin; Jr, Sergio Scarano; Slezak, Eric; Sluse, Dominique; Spíndola-Duarte, Carolina; Surdej, Jean; Wambsganss, Joachim (2022-03-03)
      We present XMM-Newton X-ray observations of nine confirmed lensed quasars at 1 ≲ z ≲ 3 identified by the Gaia Gravitational Lens program. Eight systems are strongly detected, with 0.3-8.0 keV fluxes F 0.3-8.0 ≳ 5 ×10-14 ...

    • The Gaia spectrophotometric standard stars survey. I. Preliminary results 

      Pancino, E.; Altavilla, G.; Marinoni, S.; Cocozza, G.; Carrasco, J. M.; Bellazzini, M.; Bragaglia, A.; Federici, L.; Rossetti, E.; Cacciari, C.; Nunez, L. Balaguer; Castro, A.; Figueras, F.; Pecci, F. Fusi; Galleti, S.; Gebran, M.; Jordi, C.; Lardo, C.; Masana, E.; Monguio Montells, Maria; Montegriffo, P.; Ragaini, S.; Schuster, W.; Trager, S.; Vilardell, F.; Voss, H. (2012-11-01)
      We describe two ground based observing campaigns aimed at building a grid of approximately 200 spectrophotometric standard stars (SPSS), with an internal ~1% precision and tied to Vega within ~3%, for the absolute flux ...

    • The Gaia Ultra-Cool Dwarf Sample -- II : Structure at the end of the main sequence 

      Smart, R. L.; Marocco, F.; Sarro, L. M.; Barrado, D.; Beamin, J. C.; Caballero, J. A.; Jones, H. R. A. (2019-05-01)
      We identify and investigate known late M, L, and T dwarfs in the Gaia second data release. This sample is being used as a training set in the Gaia data processing chain of the ultracool dwarfs work package. We find 695 ...

    • The Gaia Ultracool Dwarf Sample. I. Known L and T dwarfs and the first Gaia data release 

      Smart, R. L.; Marocco, F.; Caballero, J. A.; Jones, H. R. A.; Barrado, David; Beamin, J.C.; Pinfield, D. J.; Sarro, L. M. (2017-07-01)
      We identify and investigate known ultracool stars and brown dwarfs that are being observed or indirectly constrained by the Gaia mission. These objects will be the core of the Gaia ultracool dwarf sample composed of all ...

    • Gaia-ESO Survey : Analysis of pre-main sequence stellar spectra 

      Lanzafame, A. C.; Frasca, A.; Damiani, F.; Franciosini, E.; Cottaar, M.; Sousa, S. G.; Tabernero, H. M.; Klutsch, A.; Spina, L.; Biazzo, K.; Prisinzano, L.; Sacco, G. G.; Randich, S.; Brugaletta, E.; Delgado Mena, E.; Adibekyan, V.; Montes, D.; Bonito, R.; Gameiro, J. F.; Alcalá, J. M.; González Hernández, J. I.; Jeffries, R.; Messina, S.; Meyer, M.; Gilmore, G.; Asplund, M.; Binney, J.; Bonifacio, P.; Drew, J.E.; Feltzing, S.; Ferguson, A. M N; Micela, G.; Negueruela, I.; Prusti, T.; Rix, H. W.; Vallenari, A.; Alfaro, E. J.; Allende Prieto, C.; Babusiaux, C.; Bensby, T.; Blomme, R.; Bragaglia, A.; Flaccomio, E.; Francois, P.; Hambly, N.; Irwin, M.; Koposov, S. E.; Korn, A.J.; Smiljanic, R.; Van Eck, S.; Walton, N.; Bayo, A.; Bergemann, M.; Carraro, G.; Costado, M. T.; Edvardsson, B.; Heiter, U.; Hill, V.; Hourihane, A.; Jackson, R. J.; Jofré, P.; Lardo, C.; Lewis, J.; Lind, K.; Magrini, L.; Marconi, G.; Martayan, C.; Masseron, T.; Monaco, L.; Morbidelli, L.; Sbordone, L.; Worley, C. C.; Zaggia, S. (2015-04-01)
      Context. The Gaia-ESO Public Spectroscopic Survey is obtaining high-quality spectroscopy of some 100 000 Milky Way stars using the FLAMES spectrograph at the VLT, down to V = 19 mag, systematically covering all the main ...

    • Gaia-ESO Survey : Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440-6810 Å in the γ Velorum cluster, and calibration of spectral indices 

      Damiani, F.; Prisinzano, L.; Micela, G.; Randich, S.; Gilmore, G.; Drew, J.E.; Jeffries, R.D.; Frémat, Y.; Alfaro, E. J.; Bensby, T.; Bragaglia, A.; Flaccomio, E.; Lanzafame, A. C.; Pancino, E.; Recio-Blanco, A.; Sacco, G. G.; Smiljanic, R.; Jackson, R. J.; De Laverny, P.; Morbidelli, L.; Worley, C. C.; Hourihane, A.; Costado, M. T.; Jofré, P.; Lind, K.; Maiorca, E. (2014-06)
      We present a study of spectral diagnostics available from optical spectra with R = 17 000 obtained with the VLT/Giraffe HR15n setup, using observations from the Gaia-ESO Survey, on the γ Vel young cluster, with the purpose ...

    • The Gaia-ESO Survey : Extracting diffuse interstellar bands from cool star spectra: DIB-based interstellar medium line-of-sight structures at the kpc scale 

      Puspitarini, L.; Lallement, R.; Babusiaux, C.; Chen, H. C.; Bonifacio, P.; Sbordone, L.; Caffau, E.; Duffau, S.; Hill, V.; Monreal-Ibero, A.; Royer, F.; Arenou, F.; Peralta, R.; Drew, J.E.; Bonito, R.; Lopez-Santiago, J.; Alfaro, E. J.; Bensby, T.; Bragaglia, A.; Flaccomio, E.; Lanzafame, A. C.; Pancino, E.; Recio-Blanco, A.; Smiljanic, R.; Costado, M. T.; Lardo, C.; De Laverny, P.; Zwitter, T. (2015-01)
      Aims. We study how diffuse interstellar bands (DIBs) measured toward distance-distributed target stars can be used to locate dense interstellar (IS) clouds in the Galaxy and probe a line-of-sight (LOS) kinematical structure, ...

    • The Gaia-ESO survey : Processing FLAMES-UVES spectra 

      Sacco, G. G.; Morbidelli, L.; Franciosini, E.; Maiorca, E.; Randich, S.; Modigliani, A.; Gilmore, G.; Asplund, M.; Binney, J.; Bonifacio, P.; Drew, J.E.; Feltzing, S.; Ferguson, A.; Jeffries, R.; Micela, G.; Negueruela, I.; Prusti, T.; Rix, H. W.; Vallenari, A.; Alfaro, E.; Prieto, C. Allende; Babusiaux, C.; Bensby, T.; Blomme, R.; Bragaglia, A.; Flaccomio, E.; Francois, P.; Hambly, N.; Irwin, M.; Koposov, S.; Korn, A.; Lanzafame, A.; Pancino, E.; Recio-Blanco, A.; Smiljanic, R.; Van Eck, S.; Walton, N.; Bergemann, M.; Costado, M. T.; De Laverny, P.; Heiter, U.; Hill, V.; Hourihane, A.; Jackson, R.; Jofre, P.; Lewis, J.; Lind, K.; Lardo, C.; Magrini, L.; Masseron, T.; Prisinzano, L.; Worley, C. (2014-05)
      The Gaia-ESO Survey is a large public spectroscopic survey that aims to derive radial velocities and fundamental parameters of about 105 Milky Way stars in the field and in clusters. Observations are carried out with the ...

    • The Gaia-ESO Survey : Stellar content and elemental abundances in the massive cluster NGC 6705 

      Cantat-Gaudin, T.; Vallenari, A.; Zaggia, S.; Bragaglia, A.; Sordo, R.; Drew, J.E.; Eisloeffel, J.; Farnhill, H. J.; Gonzalez-Solares, E.; Greimel, R.; Irwin, M. J.; Kupcu-Yoldas, A.; Jordi, C.; Blomme, R.; Sampedro, L.; Costado, M. T.; Alfaro, E.; Smiljanic, R.; Magrini, L.; Donati, P.; Friel, E. D.; Jacobson, H.; Abbas, U.; Hatzidimitriou, D.; Spagna, A.; Vecchiato, A.; Balaguer-Nunez, L.; Lardo, C.; Tosi, M.; Pancino, E.; Klutsch, A.; Tautvaisiene, G.; Drazdauskas, A.; Puzeras, E.; Jiménez-Esteban, F.; Maiorca, E.; Geisler, D.; San Roman, I.; Villanova, S.; Gilmore, G.; Randich, S.; Bensby, T.; Flaccomio, E.; Lanzafame, A.; Recio-Blanco, A.; Damiani, F.; Hourihane, A.; Jofré, P.; De Laverny, P.; Masseron, T.; Morbidelli, L.; Prisinzano, L.; Sacco, G. G.; Sbordone, L.; Worley, C. C. (2014-09)
      Context. Chemically inhomogeneous populations are observed in most globular clusters, but not in open clusters. Cluster mass seems to play a key role in the existence of multiple populations. Aims. Studying the chemical ...

    • The Gaia-ESO Survey : The analysis of high-resolution UVES spectra of FGK-type stars 

      Smiljanic, R.; Korn, A.J.; Bergemann, M.; Frasca, A.; Magrini, L.; Masseron, T.; Pancino, E.; Ruchti, G.; San Roman, I.; Sbordone, L.; Sousa, S.G.; Tabernero, H.; Tautvaišienė, G.; Valentini, M.; Weber, M.; Worley, C. C.; Adibekyan, V. Zh; Allende Prieto, C.; Barisevičius, G.; Biazzo, K.; Blanco-Cuaresma, S.; Bonifacio, P.; Bragaglia, A.; Caffau, E.; Cantat-Gaudin, T.; Chorniy, Y.; De Laverny, P.; Delgado-Mena, E.; Donati, P.; Duffau, S.; Franciosini, E.; Friel, E.; Geisler, D.; González Hernández, J. I.; Gruyters, P.; Guiglion, G.; Hansen, C. J.; Heiter, U.; Hill, V.; Jacobson, H. R.; Jofre, P.; Jönsson, H.; Lanzafame, A. C.; Lardo, C.; Ludwig, H. G.; Maiorca, E.; Mikolaitis, S.; Montes, D.; Morel, T.; Mucciarelli, A.; Munõz, C.; Nordlander, T.; Pasquini, L.; Puzeras, E.; Recio-Blanco, A.; Ryde, N.; Sacco, G.; Santos, N.C.; Serenelli, A. M.; Sordo, R.; Soubiran, C.; Spina, L.; Steffen, M.; Vallenari, A.; Van Eck, S.; Villanova, S.; Gilmore, G.; Randich, S.; Asplund, M.; Binney, J.; Drew, J.E.; Feltzing, S.; Ferguson, A.; Jeffries, R.; Micela, G.; Negueruela, I.; Prusti, T.; Rix, H. W.; Alfaro, E.; Babusiaux, C.; Bensby, T.; Blomme, R.; Flaccomio, E.; François, P.; Irwin, M.; Koposov, S.; Walton, N.; Bayo, A.; Carraro, G.; Costado, M. T.; Damiani, F.; Edvardsson, B.; Hourihane, A.; Jackson, R.; Lewis, J.; Lind, K.; Marconi, G.; Martayan, C.; Monaco, L.; Morbidelli, L.; Prisinzano, L.; Zaggia, S. (2014-11)
      Context. The ongoing Gaia-ESO Public Spectroscopic Survey is using FLAMES at the VLT to obtain high-quality medium-resolution Giraffe spectra for about 105 stars and high-resolution UVES spectra for about 5000 stars. With ...

    • The Gaia-ESO Survey : the N/O abundance ratio in the Milky Way 

      Magrini, L.; Vincenzo, F.; Randich, S.; Pancino, E.; Casali, G.; Tautvaisiene, G.; Drazdauskas, A.; Mikolaitis, S.; Minkeviciute, R.; Stonkute, E.; Chorniy, Y.; Bagdonas, V.; Kordopatis, G.; Frie, E.; Roccatagliata, V.; Jimenez-Esteban, F. M.; Gilmore, G.; Vallenari, A.; Bensby, T.; Bragaglia, A.; Korn, A. J.; Lanzafame, A. C.; Smiljanic, R.; Bayo, A.; Casey, A. R.; Costado, M. T.; Franciosini, E.; Hourihane, A.; Jofré, P.; Lewis, J.; Monaco, L.; Morbidelli, L.; Sacco, G.; Worley, C. (2018-10-01)
      Context. The abundance ratio N/O is a useful tool to study the interplay of galactic processes, for example star formation e ciency, timescale of infall, and outflow loading factor. Aims. We aim to trace log(N/O) versus ...