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The scattering diameters of Sgr A* and several nearby OH masers (~ 1" at 1 GHz) indicate that a region of enhanced scattering is along the line of sight to the Galactic center. The scattering diameter of an extragalactic source seen through…

Astrophysics · Physics 2009-10-30 T. Joseph W. Lazio , James M. Cordes

We have imaged a 1 deg^2 field centered on the known Galactic supernova remnant (SNR) G11.2-0.3 at 74, 330, and 1465 MHz with the Very Large Array radio telescope (VLA) and 235 MHz with the Giant Metrewave Radio Telescope (GMRT). The 235,…

We present the results of a high angular resolution (1.1") and sensitivity (maximum of ~0.1 mJy) radio survey at 1-2 GHz in the Galactic Bulge. This complements the X-ray Chandra Galactic Bulge Survey, and investigates the full radio source…

High Energy Astrophysical Phenomena · Physics 2024-05-09 E. C. Pattie , T. J. Maccarone , C. T. Britt , C. O. Heinke , P. G. Jonker , D. R. Lorimer , G. R. Sivakoff , D. Steeghs , J. Strader , M. A. P. Torres , R. Wijnands

The Milky Way contains thousands of H II region candidates identified by their characteristic mid-infrared morphology, but lacking detections of ionized gas tracers such as radio continuum or radio recombination line emission. These targets…

Astrophysics of Galaxies · Physics 2021-03-17 William P. Armentrout , Loren D. Anderson , Trey V. Wenger , Dana S. Balser , Thomas M. Bania

Submillimeter Array observations of Orion-KL at 1'' resolution in the 440mu/690GHz band reveal new insights about the continuum and line emission of the region. The 440mu continuum flux density measurement from source I allows us to…

To uniformly determine the properties of supernova remnants (SNRs) at high energies, we have developed the first systematic survey at energies from 1 to 100 GeV using data from the Fermi Large Area Telescope. Based on the spatial overlap of…

High Energy Astrophysical Phenomena · Physics 2016-05-19 Fabio Acero , Markus Ackermann , Marco Ajello , Luca Baldini , Jean Ballet , Guido Barbiellini , Denis Bastieri , Ronaldo Bellazzini , E. Bissaldi , Roger Blandford , E. D. Bloom , Raffaella Bonino , Eugenio Bottacini , J. Bregeon , Philippe Bruel , Rolf Buehler , S. Buson , G. A. Caliandro , Rob A. Cameron , R Caputo , Micaela Caragiulo , Patrizia A. Caraveo , Jean Marc Casandjian , Elisabetta Cavazzuti , Claudia Cecchi , A. Chekhtman , J. Chiang , G. Chiaro , Stefano Ciprini , R. Claus , J. M. Cohen , Johann Cohen-Tanugi , L. R. Cominsky , B. Condon , Jan Conrad , S. Cutini , F. D'Ammando , A. Angelis , F. Palma , Rachele Desiante , S. W. Digel , L. Venere , Persis S Drell , Alex Drlica-Wagner , C. Favuzzi , E. C. Ferrara , Anna Franckowiak , Prof. Yasushi Fukazawa , Prof. Stefan Funk , P. Fusco , Fabio Gargano , Dario Gasparrini , Nicola Giglietto , Paolo Giommi , Francesco Giordano , Marcello Giroletti , Tom Glanzman , Gary Godfrey , G A. Gomez-Vargas , I. A. Grenier , M. -H. Grondin , L. Guillemot , Sylvain Guiriec , M Gustafsson , D. Hadasch , A. K. Harding , M. Hayashida , Elizabeth Hays , J. W. Hewitt , A. B. Hill , Deirdre Horan , X. Hou , Giulia Iafrate , Tobias Jogler , G. J'ohannesson , Anthony S. Johnson , T. Kamae , Hideaki Katagiri , Prof. Jun Kataoka , Junichiro Katsuta , Matthew Kerr , J. Knodlseder , Prof. Dale Kocevski , M. Kuss , Helene Laffon , J. Lande , S. Larsson , Luca Latronico , Marianne Lemoine-Goumard , J. Li , L. Li , Francesco Longo , Francesco Loparco , Michael N. Lovellette , Pasquale Lubrano , J. Magill , S. Maldera , Martino Marelli , Michael Mayer , M. N. Mazziotta , Peter F. Michelson , Warit Mitthumsiri , Tsunefumi Mizuno , Alexander A. Moiseev , Maria Elena Monzani , E. Moretti , Aldo Morselli , Igor V. Moskalenko , Prof. Simona Murgia , Prof. Rodrigo Nemmen , Eric Nuss , Takashi Ohsugi , Nicola Omodei , Monica Orienti , Elena Orlando , Jonathan F. Ormes , David Paneque , J. S. Perkins , Melissa Pesce-Rollins , Prof. Vahe' Petrosian , Frederic Piron , Giovanna Pivato , Troy Porter , S. Rain`o , Riccardo Rando , Massimiliano Razzano , Soebur Razzaque , Anita Reimer , Prof. Olaf Reimer , Matthieu Renaud , Thierry Reposeur , Mr. Romain Rousseau , P. M. Parkinson , J. Schmid , A. Schulz , C. Sgr`o , Eric J Siskind , Francesca Spada , Gloria Spandre , Paolo Spinelli , Andrew W. Strong , Daniel Suson , Hiro Tajima , Hiromitsu Takahashi , T. Tanaka , Jana B. Thayer , D. J. Thompson , L. Tibaldo , Omar Tibolla , Prof. Diego F. Torres , Gino Tosti , Eleonora Troja , Yasunobu Uchiyama , G. Vianello , B. Wells , Kent Wood , M. Wood , Manal Yassine , Stephan Zimmer

New narrow-band HAlpha imaging and subsequent optical spectra confirm G315.1+2.7, a previously identified candidate supernova remnant (SNR), as a bona-fide Galactic SNR. Present observations are based on independent discovery of filamentary…

Astrophysics · Physics 2008-11-26 M. Stupar , Q. A. Parker , M. D. Filipovic

We have conducted a deep radio survey with the Very Large Array at 1.4 GHz of a region containing the Hubble Deep Field. This survey overlaps previous observations at 8.5 GHz allowing us to investigate the radio spectral properties of…

Astrophysics · Physics 2009-10-31 E. A. Richards

We present the Multi-Array Galactic Plane Imaging Survey (MAGPIS), which maps portions of the first Galactic quadrant with an angular resolution, sensitivity and dynamic range that surpasses existing radio images of the Milky Way by more…

Astrophysics · Physics 2010-02-23 David J. Helfand , Robert H. Becker , Richard L. White , Adam Fallon , Sarah Tuttle

We have carried out extensive radio and optical follow-up of 176 sources from the 15 GHz 9th Cambridge survey. Optical identifications have been found for 155 of the radio sources; optical images are given with radio maps overlaid. The…

We present new radio images of the supernova remnant (SNR) CTA 1 at 1420 and 408 MHz, and in the 21 cm line of H I observed with the Dominion Radio Astrophysical Observatory Synthesis Telescope and at 1420 MHz observed with the Effelsberg…

High Energy Astrophysical Phenomena · Physics 2024-12-20 Tam Do , Roland Kothes , Alex S. Hill , Andrew Gray , Patricia Reich , Wolfgang Reich

We found diffuse hard X-ray sources, G11.0+0.0, G25.5+0.0, and G26.6-0.1 in the ASCA Galactic plane survey data. The X-ray spectra are featureless with no emission line, and are fitted with both models of a thin thermal plasma in…

Astrophysics · Physics 2009-11-07 Aya Bamba , Masaru Ueno , Katsuji Koyama , Shigeo Yamauchi

We describe a 22-year survey for variable and transient radio sources, performed with archival images taken with the Molonglo Observatory Synthesis Telescope (MOST). This survey covers $2775 \unit{deg^2}$ of the sky south of $\delta <…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Keith Bannister , Tara Murphy , Bryan M. Gaensler , Richard Hunstead , Shami Chatterjee

The problem of missing Galactic supernova remnants (SNRs) refers to the issue that the currently known Galactic SNRs are significantly incomplete compared to the theoretical prediction. To expand the sample of Galactic SNRs, we use GLEAM…

High Energy Astrophysical Phenomena · Physics 2024-07-02 Tian-Xian Luo , Ping Zhou , Hao-Ning He

We present a comprehensive multi-frequency catalogue of radio sources behind the Large Magellanic Cloud between 0.2 and 20 GHz, gathered from a combination of new and legacy radio continuum surveys. This catalogue covers an area of…

We present a catalog of compact sources derived from the QUaD Galactic Plane Survey. The survey covers ~800 square degrees of the inner galaxy (|b|<4 degrees) in Stokes I, Q and U parameters at 100 and 150 GHz, with angular resolution 5 and…

We present some first results on the variability, polarization and general properties of radio sources selected in a blind survey at 20 GHz, the highest frequency at which a sensitive radio survey has been carried out over a large area of…

We used archival very long baseline interferometry (VLBI) data of active galactic nuclei (AGN) observed from 1.4 GHz to 86 GHz to measure the angular size of VLBI radio cores in 8959 AGNs. We analysed their sky distributions, frequency…

Astrophysics of Galaxies · Physics 2022-08-15 T. A. Koryukova , A. B. Pushkarev , A. V. Plavin , Y. Y. Kovalev

We present results from a study of optically emitting Supernova Remnants (SNRs) in six nearby galaxies (NGC 2403, NGC 3077, NGC 4214, NGC 4395, NGC 4449 and NGC 5204) based on deep narrow band H{\alpha} and [SII] images as well as…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 I. Leonidaki , P. Boumis , A. Zezas

We present high-resolution radio observations of a sample of 65 radio sources at low Galactic latitudes. The sources were all observed at 5 GHz with the Very Large Array A-array. MERLIN observations at 5 GHz of the ultracompact HII region…

Astrophysics · Physics 2009-11-10 D. J. Saikia , P. Thomasson , S. Roy , A. Pedlar , T. W. B. Muxlow