Browsing University of Hertfordshire by Title

Now showing items 12412-12431 of 24360

    • The JCMT Plane Survey: early results from the ell = 30deg field 

      Moore, T.~J.~T.; Plume, R.; Thompson, M.~A.; Parsons, H.; Urquhart, J.~S.; Eden, D.~J.; Dempsey, J.~T.; Morgan, L.~K.; Thomas, H.~S.; Buckle, J.; Brunt, C.~M.; Butner, H.; Carretero, D.; Chrysostomou, A.; deVilliers, H.~M.; Fich, M.; Hoare, M.~G.; Manser, G.; Mottram, J.~C.; Natario, C.; Olguin, F.; Peretto, N.; Polychroni, D.; Redman, R.~O.; Rigby, A.~J.; Salji, C.; Summers, L.~J.; Berry, D.; Currie, M.~J.; Jenness, T.; Pestalozzi, M.; Traficante, A.; Bastien, P.; diFrancesco, J.; Davis, C.~J.; Evans, A.; Friberg, P.; Fuller, G.~A.; Gibb, A.~G.; Gibson, S.; Hill, T.; Johnstone, D.; Joncas, G.; Longmore, S.~N.; Lumsden, S.~L.; Martin, P.~G.; Lu'o'ng, Q.~N.; Pineda, J.~E.; Purcell, C.; Richer, J.~S.; Schieven, G.~H.; Shipman, R.; Spaans, M.; Taylor, A.~R.; Viti, S.; Weferling, B.; White, G.~J.; Zhu, M. (2015-11-11)
      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 JCMT Transient Survey : Single Epoch Transients and Variability of Faint Sources 

      Johnstone, Doug; Lalchand, Bhavana; Mairs, Steve; Shang, Hsien; Chen, Wen Ping; Bower, Geoffrey C.; Herczeg, Gregory J.; Lee, Jeong-Eun; Forbrich, Jan; Chen, Bo-Yan; Contreras-Pena, Carlos; Lee, Yong-Hee; Park, Wooseok; Broughton, Colton; Plovie, Spencer; Team, The JCMT Transient (2022-09-15)
      Short-duration flares at millimeter wavelengths provide unique insights into the strongest magnetic reconnection events in stellar coronae, and combine with longer-term variability to introduce complications to next-generation ...

    • The JCMT Transient Survey: An Extraordinary Submillimeter Flare in the T Tauri Binary System JW 566 

      Mairs, Steve; Lalchand, Bhavana; Bower, Geoffrey C.; Forbrich, Jan; Bell, Graham S.; Herczeg, Gregory J.; Johnstone, Doug; Chen, Wen-Ping; Lee, Jeong-Eun; Hacar, Alvaro (2019-01-23)
      The binary T Tauri system JW 566 in the Orion Molecular Cloud underwent an energetic, short-lived flare observed at submillimetre wavelengths by the SCUBA-2 instrument on 26 November 2016 (UT). The emission faded by nearly ...

    • The JCMT Transient Survey: Four-year Summary of Monitoring the Submillimeter Variability of Protostars 

      Lee, Yong-Hee; Johnstone, Doug; Lee, Jeong-Eun; Herczeg, Gregory; Mairs, Steve; Contreras-Peña, Carlos; Hatchell, Jennifer; Naylor, Tim; Bell, Graham S.; Bourke, Tyler L.; Broughton, Colton; Francis, Logan; Gupta, Aashish; Harsono, Daniel; Liu, Sheng-Yuan; Park, Geumsook; Plovie, Spencer; Moriarty-Schieven, Gerald H.; Scholz, Aleks; Sharma, Tanvi; Teixeira, Paula Stella; Wang, Yao-Te; Aikawa, Yuri; Bower, Geoffrey C.; Chen, Huei-Ru Vivien; Bae, Jaehan; Baek, Giseon; Chapman, Scott; Chen, Wen Ping; Du, Fujun; Dutta, Somnath; Forbrich, Jan; Guo, Zhen; Inutsuka, Shu-ichiro; Kang, Miju; Kirk, Helen; Kuan, Yi-Jehng; Kwon, Woojin; Lai, Shih-Ping; Lalchand, Bhavana; Lane, James M. M.; Lee, Chin-Fei; Liu, Tie; Morata, Oscar; Pearson, Samuel; Pon, Andy; Sahu, Dipen; Shang, Hsien; Stamatellos, Dimitris; Tang, Shih-Yun; Xu, Ziyan; Yoo, Hyunju (2021-10-21)
      We present the four-year survey results of monthly submillimeter monitoring of eight nearby ($<500 $pc) star-forming regions by the JCMT Transient Survey. We apply the Lomb-Scargle Periodogram technique to search for and ...

    • JEMS: A Deep Medium-band Imaging Survey in the Hubble Ultra Deep Field with JWST NIRCam and NIRISS 

      Williams, Christina C.; Tacchella, Sandro; Maseda, Michael V.; Robertson, Brant E.; Johnson, Benjamin D.; Willott, Chris J.; Eisenstein, Daniel J.; Willmer, Christopher N. A.; Ji, Zhiyuan; Hainline, Kevin N.; Helton, Jakob M.; Alberts, Stacey; Baum, Stefi; Bhatawdekar, Rachana; Boyett, Kristan; Bunker, Andrew J.; Carniani, Stefano; Charlot, Stephane; Chevallard, Jacopo; Curtis-Lake, Emma; de Graaff, Anna; Egami, Eiichi; Franx, Marijn; Kumari, Nimisha; Maiolino, Roberto; Nelson, Erica J.; Rieke, Marcia J.; Sandles, Lester; Shivaei, Irene; Simmonds, Charlotte; Smit, Renske; Suess, Katherine A.; Sun, Fengwu; Übler, Hannah; Witstok, Joris (2023-10-09)
      We present JWST Extragalactic Medium-band Survey, the first public medium-band imaging survey carried out using JWST/NIRCam and NIRISS. These observations use ∼2 and ∼4 μm medium-band filters (NIRCam F182M, F210M, F430M, ...

    • The Jet Angular Profile and the Afterglow Light Curves 

      Granot, J.; Kumar, P.; Piran, T. (2004)

    • Jet Feedback in Star-Forming Galaxies 

      Krause, Martin (2023-02-12)
      In this paper, I review our understanding of how jet feedback works in star-forming galaxies. There are some interesting differences to radiative feedback from Active Galactic Nuclei (AGN). Jets act on galaxy haloes as ...

    • The jet heated x-ray filament in the Centaurus A northern middle radio lobe 

      Kraft, R.P.; Forman, W.R.; Hardcastle, M.J.; Birkinshaw, M.; Croston, J.H.; Jones, C.; Nulsen, P.E.J.; Worrall, D.M.; Murray, S.S. (2009)
      We present results from a 40 ks XMM-Newton observation of the X-ray filament coincident with the southeast edge of the Centaurus A Northern Middle Radio Lobe (NML). We find that the X-ray filament consists of five spatially ...

    • Jet interactions with a giant molecular cloud in the Galactic centre and ejection of hypervelocity stars 

      Silk, J.; Antonuccio-Delogu, V.; Dubois, Y.; Gaibler, V.; Haas, M.~R.; Khochfar, S.; Krause, Martin (2012-09-21)
      The hypervelocity OB stars in the Milky Way Galaxy were ejected from the central regions some 10-100 million years ago. We argue that these stars, as well as many more abundant bound OB stars in the innermost few parsecs, ...

    • Jet Kinematics of AGNs at High Radio Frequencies 

      Jorstad, S.G.; Marscher, A.P.; Lister, M.; Stirling, A.M.; Cawthorne, T.V.; Gomez, J-L.; Gear, W.K.; Stevens, J. A.; Robson, E.I.; Smith, P.S.; Forster, J.R. (Astronomical Society of the Pacific, 2006)
      We have completed a 3 yr program of polarization monitoring of 15 active galactic nuclei with the Very Long Baseline Array at 7 mm wavelength. At some epochs the images are accompanied by nearly simultaneous polarization ...

    • Jet speeds in wide angle tailed radio galaxies 

      Jetha, N.N.; Hardcastle, M.J.; Sakelliou, I. (2006)

    • Jet termination in wide-angle tail radio sources 

      Hardcastle, M.J.; Sakelliou, I. (2004-04)

    • Jet-induced star formation in gas-rich galaxies 

      Gaibler, V.; Khochfar, S.; Krause, M.; Silk, J. (2012-09-01)
      Feedback from active galactic nuclei (AGN) has become a major component in simulations of galaxy evolution, in particular for massive galaxies. AGN jets have been shown to provide a large amount of energy and are capable ...

    • Jet/Environment Interactions in Low-Power Radio Galaxies 

      Croston, J.H. (Astronomical Society of the Pacific, 2008)
      The interactions between low-power radio galaxies and their environments are thought to play a crucial role in supplying energy to offset cooling in the centres of groups and clusters. Such interactions are also important ...

    • Jet/Environment Interactions of FRI and FRII Radio Galaxies. 

      Croston, J.H.; Hardcastle, M.J.; Birkinshaw, M.; Worrall, D.M. (2004)
      We present the results of new XMM-Newton observations of FRI and FRII radio galaxies that show the importance of jet/environment interactions for both radiosource structure and the properties of the surrounding gas. The ...

    • The Jet/ISM Interaction in Three Nearby Radio Galaxies as Seen with Chandra. 

      Kraft, R.P.; Forman, W.R.; Churazov, E.; Eilek, J.; Hardcastle, M.J.; Heinz, S.; Jones, C.; Markevitch, M.; Murray, S.S.; Nulsen, P.E.J.; Owen, F.; Vikhlinin, V.; Worrall, D.M. (2004)
      Chandra observations of radio galaxies have demonstrated a wide range of complex interactions between their jets and the ambient interstellar/intracluster medium (ISM/ICM). In this paper, we discuss results from Chandra ...

    • A Jetdriven, Extreme High-Velocity Outflow Powered by a Cold, Low-Luminosity Protostar near NGC 2023 

      Sandell, G.; Avery, L.W.; Baas, F.; Coulson, I.M.; Dent, W.R.; Friberg, P.; Gear, W.P.K.; Greaves, J.S.; Holland, W.S.; Jenness, T.; Jewell, P.; Lightfoot, J.F.; Matthews, H.; Moriarty-Schieven, G.; Prestage, R.; Robson, E.I.; Stevens, J. A.; Tilanus, R.P.J.; Watt, G.D. (1999)

    • Jets and multi-phase turbulence . 

      Krause, M.~G.~H. (Memorie della Societa Astronomica Italiana, 2008-06-06)
      Jets are observed to stir up multiphase turbulence in the interstellar medium as well as far beyond the host galaxy. Here we present detailed simulations of this process. We evolve the hydrodynamics equations with optically ...

    • The jets in 3C 296 

      Hardcastle, M.J.; Alexander, P.; Pooley, G.G.; Riley, J.M. (1997)
      We present observations made with the VLA at 1.5 and 8.4 GHz of the nearby FRI radio galaxy 3C296. The most recent models of FRI radio galaxies suggest that sub- stantial deceleration must take place in their jets, with ...

    • Jets, plumes and hotspots in the wide-angle tail source 3C 130 

      Hardcastle, M.J. (1998)
      I present 1.5- and 8.4-GHz observations with all configurations of the NRAO VLA of the wide-angle tail source 3C130. The source has a pair of relatively symmetrical, well- collimated inner jets, one of which terminates in ...