FY2013 Science Highlights Science Website
canada goose outlet shop ALMA Opens a New Window on Supernova Ejecta canada goose outlet shop
ALMA’s unprecedented sensitivity Canada Goose Online and resolution have enabled scientists to identify CO and SiO in the Supernova (SN) 1987A inner ejecta. The C/O clumps in SN1987A contain at least 0. 01 M of 12CO, an order of magnitude greater amount than measured in the first few years after the explosion. 12CO has clearly continued to form over the past canada goose factory sale 25 years. This CO is at T > 14K, is confined within at most 35% of a spherical volume expanding at 2000 km/sec. The emission is located within 1 arcsecond of the central debris.
canada goose selfridges uk ALMA views the canada goose uk outlet full velocity range of emission, unobscured by dust. Canada Goose Jackets Doppler tomography will be possible in CO and other molecules (SiO) to probe the spatial, chemical, and kinetic environment within the inner ejecta. canada goose selfridges uk
Figure: A color composite image of SN 1987A. [Red] The unresolved 12CO 2 1 line emission detected by ALMA. The red ellipse at lower is Canada Goose Parka the synthesized beam. [Blue] H emission. The [Si I] + [Fe II] 1.644 micron emission [Green in the ring; Yellow in the ejecta] observed with HST (Larsson et al. 2013).
View Publication: Carbon Monoxide in the Cold Debris of Supernova 1987A, J. Kamenetzky (Colorado Boulder), R. McCray (Colorado Boulder), R. Indebetouw (Virginia, NRAO), M. J. Barlow (University College London), M. Matsuura (University College London), M. Blommaert (KU Leuven. Vrije), A. Bolatto (Maryland), L. Decin (KU Leuven), L. Dunne (Canterbury), C. Fransson (Stockholm), J. Glenn (Colorado Boulder), H. L. Groenewegen ((Royal Obs Belgium), R. Kirshner (Harvard), M. Lakicevic (Keele), J. Marcaide (Valencia), I. Marti Vidal (Onsala), M. Meixner (STScI), P. Royer (KU Leuven), A. Soderberg (Harvard), G. Sonneborn (NASA Goddard), L. Staveley Smith (ICRAR,CAAS TRO), B. M. Swinyard (University College London), https://www.dvu-nds.de G. van Hoof (Royal Obs Belgium), J. Th. van Loon (Keele), J. Yates (University College London), G. Zanardo, (CAAS TRO), 2013 ApJ Letters, 773, L34 (20 August 2013).
Imaging of the CO Snow Line in a Solar Nebula Analog
canada goose outlet in toronto ALMA has imaged the CO “snow line” around TW Hya, an analog of the solar nebula. Planets form in the disks around young stars. Their formation efficiency and composition are intimately linked to the protoplanetary disk locations of snow lines of abundant volatiles. The chemical imaging used high spatial and spectral resolution observations of N2H+, a reactive ion present in large abundance only where CO is frozen out. The N2H+ emission is distributed in a large ring, with an inner radius that matches CO snow line model predictions. The extracted CO snow line radius of canada goose 30 AU is a key parameter in constraining models of the formation dynamics of planetary systems. canada goose outlet in toronto
canada goose black friday 2019 uk Figure: ALMA and Submillimeter Array images of dust, CO and N2H+ emission toward TW Hya. The red circle is the CO snow line prediction. canada goose black friday 2019 uk
canada goose bomber uk View Publication: Imaging of the CO Snow Line in a Solar Nebula Analog, Chunhua Qi (CfA), Karin I. Oberg (Virginia), David J. Wilner (CfA), Paolo D’Alesso (UNAM), Edwin Bergin (Michigan), Sean M. Andrews (CfA), Geoffrey A. canada goose clearance sale Blake (Caltech), Michiel R. Hogerheijde (Leiden), Ewine F. van Dishoeck (Leiden, MPIfE), Science, 341, 630 (9 August 2013). Published in Science Express 18 July 2013. canada goose bomber uk
View 18 July 2013 Press canada goose coats Release
A Galaxy buy canada goose jacket cheap scale Molecular Outflow
ALMA has imaged expanding molecular shells in the starburst nucleus of NGC 253 at 50 parsec resolution. The extra planar molecular canada goose outlet gas closely tracks the H filaments, and connects to expanding molecular shells located in the starburst region. The molecular outflow rate is 9 M per year, implying a ratio of mass outflow rate to star formation rate of 3, indicating that the starburst uk canada goose driven wind limits the star formation activity and the final stellar content. These observations support the idea that the growth of large galaxies may be limited by strong wind driven outflows.
Figure: Blue and magenta contours are CO emission at +/ 100 km/s around the NGC 253 nucleus.
View Publication: Suppression of Star Formation in the Galaxy NGC 253 by a Starburst driven Molecular Wind, Alberto D. Bollato (Maryland), Steven R. Warren (Maryland), Adam K. Leroy (NRAO), Fabian Walter (MPIfA), Sylvain Veilleux (Maryland), Eve C. Ostriker (Princeton), Jrgen Ott (NRAO), Martin Zwaan (ESO), David B. Fisher (Maryland), Axel Weiss (MPIfR), Erik Rosolowsky (British Columbia), and Jacqueline Hodge (MPIfA), 2013 Nature 499, 450 (25 July 2013).
View 24 July 2013 Press Release
canada goose outlet mall An HI Pilot Deep Field canada goose outlet mall
The Jansky VLA has been used for a deep pilot search for neutral hydrogen in distant galaxies. Part of the COSMOS field was observed for 50 hours, and 33 galaxies were detected in HI to z = 0.2, including three without a previously known spectroscopic redshift. The detections have a range of HI and stellar masses, indicating the diversity of galaxies probed. This pilot study shows that the VLA B array is the ideal configuration for H I deep fields, and that the VLA is ready a very deep HI survey, as a key pathfinder for the Square Kilometre Array.
Figure: Sample detections in the Jansky VLA pilot HI deep field. van Gorkum (Columbia), Kelley M. Verheijen canada goose coats on sale (Groningen), Patricia cheap Canada Goose A. Henning (New Mexico), David Schiminovich (Columbia), Matthew A. Bershady (Wisconsin), Eric M. Wilcots (Wisconsin), and Nick Scoville (Caltech), 2013 ApJ Letters, 770, L29 (20 June 2013).
Gould’s Belt VLA Survey: The Ophiuchus Complex
Large scale (2000 square arcmin), deep (20 micro Jy), high resolution (1 arcsec) Jansky VLA observations of the Ophiuchus star forming complex from 4 to 6 cm are presented. A total of 189 sources were detected: 56 associated with known young stellar sources; 4 with known extragalactic objects; the other 129 remain unclassified, but most of them are most probably background quasars. The vast majority of the young stars detected at radio wavelengths have spectral types K or M, although 4 objects of A/F/B spectral type and 2 brown dwarf candidates were also detected. At least half of these young stars are non thermal, gyro synchrotron sources, with active coronas characterized by high levels of variability, negative spectral indices and, in some cases, significant circular polarization. As expected, there is a clear tendency for the fraction of non thermal sources to increase from the younger (Class 0/I or flat spectrum) to the more evolved (Class III or weak line T Tauri).
canada goose online uk reviews Figure: Location of the YSOs (blue circles) and candidate YSOs (green circle) on the Ophiuchus complex extinction map. The position of the new calibrator detected is indicated by the brown square in the Ophiuchus core. canada goose online uk reviews
View Publication: The Gould’s Belt Very Large Array Survey I: The Ophiuchus Complex, Sergio A. Dzib (UNAM), Laurent Loinard (UNAM, MPIfR), Amy Mioduszewski (NRAO), Luis Rodriguez (UNAM. King Abdulaziz), Gisela N. Ortiz Leon (UNAM), Gerardo Pech (UNAM), Juana L. Rivera (UNAM), Rosa M. Torres (Santiago), Andrew F. Boden (Caltech), Lee Hartmann (Michigan), Neal J. Evans II (Texas), Cesar Briceno (Venezuela), and John Tobin (NRAO), 2013 ApJ, 775, 63 (20 September 2013).