Now showing items 374-393 of 877

  • A Jacobian-free Newton-Krylov method for time-implicit multidimensional hydrodynamics 

    Viallet, M; Goffrey, T; Baraffe, I; Folini, D; Geroux, C; Popov, M; Pratt, J; Walder, R (arXiv.org, 2015-12-14)
    This work is a continuation of our efforts to develop an efficient implicit solver for multidimensional hydrodynamics for the purpose of studying important physical processes in stellar interiors, such as turbulent convection ...
  • The James Clerk Maxwell telescope dense gas survey of the Perseus molecular cloud 

    Walker-Smith, SL; Richer, JS; Buckle, JV; Hatchell, J; Drabek-Maunder, E (Oxford University Press (OUP) on behalf of the Royal Astronomical Society, 2013-01-01)
    We present the results of a large-scale survey of the very dense (n > 106 cm-3) gas in the Perseus molecular cloud using HCO+ and HCN (J = 4 → 3) transitions. We have used this emission to trace the structure and kinematics ...
  • The James Clerk Maxwell telescope Legacy Survey of the Gould Belt: A molecular line study of the Ophiuchus molecular cloud 

    White, GJ; Drabek-Maunder, E; Rosolowsky, E; Ward-Thompson, D; Davis, J; Gregson, J; Hatchell, J; Etxaluze, M; Stickler, S; Buckle, J; Johnstone, D; Friesen, R; Sadavoy, S; Natt, KV; Currie, M; Richer, JS; Pattle, K; Spaans, M; Di Francesco, J; Hogerheijde, MR (Oxford University Press (OUP) on behalf of the Royal Astronomical Society, 2014-01-01)
    CO, 13CO, and C18O J = 3-2 observations are presented of the Ophiuchus molecular cloud. The 13CO and C18O emission is dominated by the Oph A clump, and the Oph B1, B2, C, E, F, and J regions. The optically thin(ner) C18O ...
  • The JCMT Gould Belt Survey: a first look at dense cores in Orion B 

    Kirk, H; Di Francesco, J; Johnstone, D; Duarte-Cabral, A; Sadavoy, S; Hatchell, J; Mottram, JC; Buckle, J; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Jenness, T; Nutter, D; Pattle, K; Pineda, JE; Quinn, C; Salji, C; Tisi, S; Hogerheijde, MR; Ward-Thompson, D; Bastien, P; Bresnahan, D; Butner, H; Chen, M; Chrysostomou, A; Coude, S; Davis, CJ; Drabek-Maunder, E; Fiege, J; Friberg, P; Friesen, R; Fuller, GA; Graves, S; Greaves, J; Gregson, J; Holland, W; Joncas, G; Kirk, JM; Knee, LBG; Mairs, S; Marsh, K; Matthews, BC; Moriarty-Schieven, G; Mowat, C; Rawlings, J; Richer, J; Robertson, D; Rosolowsky, E; Rumble, D; Thomas, H; Tothill, N; Viti, S; White, GJ; Wouterloot, J; Yates, J; Zhu, M (IOP Publishing, 2016-02-01)
    We present a first look at the SCUBA-2 observations of three sub-regions of the Orion B molecular cloud: LDN 1622, NGC 2023/2024, and NGC 2068/2071, from the JCMT Gould Belt Legacy Survey. We identify 29, 564, and 322 dense ...
  • The JCMT Gould Belt Survey: a quantitative comparison between SCUBA-2 data reduction methods 

    Mairs, S; Johnstone, D; Kirk, H; Graves, S; Buckle, J; Beaulieu, SF; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Hatchell, Jennifer; Jenness, T; Mottram, JC; Nutter, D; Pattle, K; Pineda, JE; Salji, C; Francesco, JD; Hogerheijde, MR; Ward-Thompson, D; JCMT Gould Belt survey Team (Oxford University Press for Royal Astronomical Society, 2015-12-01)
    Performing ground-based submillimetre observations is a difficult task as the measurements are subject to absorption and emission from water vapour in the Earth's atmosphere and time variation in weather and instrument ...
  • The JCMT Gould Belt Survey: constraints on prestellar core properties in Orion A North 

    Salji, CJ; Richer, JS; Buckle, JV; Hatchell, Jennifer; Kirk, H; Beaulieu, SF; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Jenness, T; Johnstone, D; Mottram, JC; Nutter, D; Pattle, K; Pineda, JE; Quinn, Ciara; Tisi, S; Walker-Smith, S; Francesco, JD; Hogerheijde, MR; Ward-Thompson, D; Bastien, P; Butner, H; Chen, M; Chrysostomou, A; Coude, S; Davis, CJ; Drabek-Maunder, E; Duarte-Cabral, A.; Fiege, J; Friberg, P; Friesen, R; Fuller, GA; Graves, S; Greaves, J; Gregson, J; Holland, W; Joncas, G; Kirk, JM; Knee, LBG; Mairs, S; Marsh, K; Matthews, BC; Moriarty-Schieven, G; Rawlings, J.; Robertson, D.; Rosolowsky, E.; Rumble, D.; Sadavoy, S; Thomas, H.; Tothill, N; Viti, S; White, GJ; Wilson, CD; Wouterloot, J; Yates, J; Zhu, M (Oxford University Press for Royal Astronomical Society, 2015-05-01)
    We employ SCUBA-2 (Submillimetre Common-User Bolometer Array 2) observations of the Orion A North molecular cloud to derive column density and temperature maps. We apply a novel, Hessian-based structural identification ...
  • The JCMT Gould Belt Survey: dense core clusters in Orion B 

    Kirk, H; Johnstone, D; Di Francesco, J; Lane, J; Buckle, J; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Hatchell, J; Jenness, T; Mottram, JC; Nutter, D; Pattle, K; Pineda, JE; Quinn, C; Salji, C; Tisi, S; Hogerheijde, MR; Ward-Thompson, D (American Astronomical Society, 2016-04-18)
    © 2016. The American Astronomical Society. All rights reserved.The James Clerk Maxwell Telescope Gould Belt Legacy Survey obtained SCUBA-2 observations of dense cores within three sub-regions of Orion B: LDN 1622, NGC ...
  • The JCMT Gould Belt Survey: Evidence for Dust Grain Evolution in Perseus Star-forming Clumps 

    Chun-Yuan Chen, M; Di Francesco, J; Johnstone, D; Sadavoy, S; Hatchell, J; Mottram, JC; Kirk, H; Buckle, J; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Jenness, T; Nutter, D; Pattle, K; Pineda, JE; Quinn, C; Salji, C; Tisi, S; Hogerheijde, MR; Ward-Thompson, D; Bastien, P; Bresnahan, D; Butner, H; Chrysostomou, A; Coude, S; Davis, CJ; Drabek-Maunder, E; Duarte-Cabral, A; Fiege, J; Friberg, P; Friesen, R; Fuller, GA; Graves, S; Greaves, J; Gregson, J; Holland, W; Joncas, G; Kirk, JM; Knee, LBG; Mairs, S; Marsh, K; Matthews, BC; Moriarty-Schieven, G; Mowat, C; Pezzuto, S; Rawlings, J; Richer, J; Robertson, D; Rosolowsky, E; Rumble, D; Schneider-Bontemps, N; Thomas, H; Tothill, N; Viti, S; White, GJ; Wouterloot, J; Yates, J; Zhu, M (American Astronomical Society, 2016-07-25)
    The dust emissivity spectral index, β, is a critical parameter for deriving the mass and temperature of star-forming structures and, consequently, their gravitational stability. The β value is dependent on various dust ...
  • The JCMT Gould Belt Survey: evidence for radiative heating and contamination in the W40 complex 

    Rumble, D; Hatchell, J; Pattle, K; Kirk, H; Wilson, T; Buckle, J; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Jenness, T; Johnstone, D; Mottram, JC; Nutter, D; Pineda, JE; Quinn, C; Salji, C; Tisi, S; Walker-Smith, S; Francesco, JD; Hogerheijde, MR; Ward-Thompson, D; Bastien, P; Bresnahan, D; Butner, H; Chen, M; Chrysostomou, A; Coude, S; Davis, CJ; Drabek-Maunder, E; Duarte-Cabral, A; Fiege, J; Friberg, P; Friesen, R; Fuller, GA; Graves, S; Greaves, J; Gregson, J; Holland, W; Joncas, G; Kirk, JM; Knee, LBG; Mairs, S; Marsh, K; Matthews, BC; Moriarty-Schieven, G; Mowat, C; Rawlings, J; Richer, J; Robertson, D; Rosolowsky, E; Sadavoy, S; Thomas, H; Tothill, N; Viti, S; White, GJ; Wouterloot, J; Yates, J; Zhu, M (Oxford University Press, 2016-05-26)
    We present SCUBA-2 450{\mu}m and 850{\mu}m observations of the W40 complex in the Serpens-Aquila region as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) of nearby star-forming regions. We investigate ...
  • The JCMT gould belt survey: Evidence for radiative heating in serpens MWC 297 and its influence on local star formation 

    Rumble, D.; Hatchell, Jennifer; Gutermuth, Robert A.; Kirk, H.; Buckle, J.; Beaulieu, S.F.; Berry, D.S.; Broekhoven-Fiene, H.; Currie, M.J.; Fich, M.; Jenness, T.; Johnstone, D.; Mottram, J.C.; Nutter, D.; Pattle, K.; Pineda, J.E.; Quinn, Ciara; Salji, C.; Tisi, S.; Walker-Smith, S.; Di Francesco, J.; Hogerheijde, MR; Ward-Thompson, D.; Allen, L.E.; Cieza, L.A.; Dunham, M.M.; Harvey, P.M.; Stapelfeldt, K.R.; Bastien, P.; Butner, H.; Chen, M.; Chrysostomou, A.; Coude, S.; Davis, C.J.; Drabek-Maunder, Emily R.; Duarte-Cabral, A.; Fiege, J.; Friberg, P.; Friesen, R.; Fuller, G.A.; Graves, S.; Greaves, J.; Gregson, J.; Holland, W; Joncas, G.; Kirk, J.M.; Knee, L.B.G.; Mairs, S.; Marsh, K.; Matthews, B.C.; Moriarty-Schieven, G.; Rawlings, J.; Richer, J.; Robertson, D.; Rosolowsky, E.; Sadavoy, S.I.; Thomas, H.; Tothill, N.; Viti, S.; White, G.J.; Wilson, C.D.; Wouterloot, J.; Yates, J.; Zhu, Ming (Oxford University Press for Royal Astronomical Society, 2015-02-14)
    We present SCUBA-2 450 and 850 μm observations of the Serpens MWC 297 region, part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey of nearby star-forming regions. Simulations suggest that radiative feedback ...
  • The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population 

    Pattle, K; Ward-Thompson, D; Kirk, JM; White, GJ; Drabek-Maunder, E; Buckle, J; Beaulieu, SF; Berry, DS; Broekhoven-Fiene, H; Currie, M; Fich, M; Hatchell, Jennifer; Kirk, H; Jenness, T; Johnstone, D; Mottram, JC (Oxford University Press for Royal Astronomical Society, 2015-06)
    In this paper, we present the first observations of the Ophiuchus molecular cloud performed as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) with the SCUBA-2 instrument. We demonstrate methods ...
  • The JCMT Gould Belt Survey: low-mass proto-planetary discs from a SCUBA-2 census of NGC1333 

    Dodds, P; Greaves, J; Scholz, A; Hatchell, J; Holland, WS; JCMT Gould Belt Survey Team (Oxford University Press (OUP) on behalf of the Royal Astronomical Society, 2015)
    NGC1333 is a 1-2 Myr old cluster of stars in the Perseus molecular cloud. We used 850mu data from the Gould Belt Survey with SCUBA-2 on the JCMT to measure or place limits on disc masses for 82 Class II sources in this ...
  • The JCMT Gould Belt Survey: SCUBA-2 observations of circumstellar discs in L 1495 

    Buckle, JV; Drabek-Maunder, E; Greaves, J; Richer, JS; Matthews, BC; Johnstone, D; Kirk, H; Beaulieu, SF; Berry, DS; Broekhoven-Fiene, H; Currie, MJ; Fich, M; Hatchell, J; Jenness, T; Mottram, JC; Nutter, D; Pattle, K; Pineda, JE; Salji, C; Tisi, S; Francesco, JD; Hogerheijde, MR; Ward-Thompson, D; Bastien, P; Butner, H; Chen, M; Chrysostomou, A; Coude, S; Davis, CJ; Duarte-Cabral, A; Friberg, P; Friesen, R; Fuller, GA; Graves, S; Gregson, J; Holland, W; Joncas, G; Kirk, JM; Knee, LBG; Mairs, S; Marsh, K; Moriarty-Schieven, G; Rawlings, J; Rosolowsky, E; Rumble, D; Sadavoy, S; Thomas, H; Tothill, N; Viti, S; White, GJ; Wilson, CD; Wouterloot, J; Yates, J; Zhu, M (Oxford Journals, 2015-05-01)
    We present 850 and 450 μm data from the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey obtained with Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and characterize the dust attributes of Class I, Class II ...
  • The JCMT Gould Belt Survey: SCUBA-2 observations of radiative feedback in NGC1333 

    Hatchell, Jennifer; Wilson, T.; Drabek, E.; Curtis, E.; Richer, J.; Di Francesco, J.; Ward-Thompson, D. (Oxford University Press for Royal Astronomical Society, 2013)
    We present observations of NGC 1333 from SCUBA-2 on the James Clerk Maxwell Telescope (JCMT), observed as a JCMT Gould Belt Survey pilot project during the shared risk campaign when the first of four arrays was installed ...
  • The JCMT Gould Belt Survey: the effect of molecular contamination in SCUBA-2 observations of Orion A 

    Coudé, S; Bastien, P; Kirk, H; Johnstone, D; Drabek-Maunder, Emily R.; Graves, S; Hatchell, Jennifer; Chapin, EL; Gibb, AG; Matthews, B.C.; JCMT Gould Belt Survey Team (Royal Astronomical Society, 2016-04-01)
    Thermal emission from cold dust grains in giant molecular clouds can be used to probe the physical properties, such as density, temperature and emissivity in star-forming regions. We present the Submillimetre Common-User ...
  • The JCMT Gould Belt Survey: understanding the influence of outflows on Gould Belt clouds 

    Drabek-Maunder, Emily R.; Hatchell, Jennifer; Buckle, JV; Di Francesco, J.; Richer, J. (Royal Astronomical Society, 2016-03-01)
    Using James Clerk Maxwell Telescope (JCMT) Gould Belt Survey data from CO J = 3 → 2 isotopologues, we present a meta-analysis of the outflows and energetics of star-forming regions in several Gould Belt clouds. The majority ...
  • The JCMT Plane Survey: early results from the ℓ = 30° field 

    Moore, TJT; Plume, R; Thompson, MA; Parsons, H; Urquhart, JS; Eden, DJ; Dempsey, JT; Morgan, LK; Thomas, HS; Buckle, J; Brunt, CM; Butner, H; Carretero, D; Chrysostomou, A; deVilliers, HM; Fich, M; Hoare, MG; Manser, G; Mottram, JC; Natario, C; Olguin, F; Peretto, N; Polychroni, D; Redman, RO; Rigby, AJ; Salji, C; Summers, LJ; Berry, D; Currie, MJ; Jenness, T; Pestalozzi, M; Traficante, A; Bastien, P; diFrancesco, J; Davis, CJ; Evans, A; Friberg, P; Fuller, GA; Gibb, AG; Gibson, S; Hill, T; Johnstone, D; Joncas, G; Longmore, SN; Lumsden, SL; Martin, PG; Lu'o'ng, QN; Pineda, JE; Purcell, C; Richer, JS; Schieven, GH; Shipman, R; Spaans, M; Taylor, AR; Viti, S; Weferling, B; White, GJ; Zhu, M (Oxford University Press (OUP), 2015-09-17)
    We present early results from the JCMT (James Clerk Maxwell Telescope) Plane Survey (JPS), which has surveyed the northern inner Galactic plane between longitudes ℓ = 7° and ℓ = 63° in the 850-μm continuum with SCUBA-2 ...
  • The KdV hierarchy in optics 

    Horsley, SAR (IOP Publishing: Hybrid Open Access, 2016-07-20)
    There is a well explored relationship between quantum mechanical scattering from a potential and the Korteweg–de Vries (KdV) equation of fluid dynamics: if the potential is ‘evolved’ according to the KdV equation then it ...
  • Klein backscattering and Fabry-Pérot interference in graphene heterojunctions 

    Shytov, A.V.; Rudner, M.S.; Levitov, L.S. (American Physical Society, 2008)
    We present a theory of quantum-coherent transport through a lateral p-n-p structure in graphene, which fully accounts for the interference of forward and backward scattering on the p-n interfaces. The backreflection amplitude ...
  • Klein tunneling, contact doping, and pn-interfaces in gated suspended graphene 

    Laitinen, Antti; Paraoanu, G.S.; Oksanen, Mika; Craciun, Monica F.; Russo, Saverio; Sonin, Edouard; Hakonen, Pertti (arXiv.org, 2015)
    The inherent asymmetry of the electric transport in graphene is attributed to Klein tunneling across barriers defined by pn-interfaces between positively and negatively charged regions. By combining conductance and shot ...