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We present a detailed study of the stellar and HI structure of the dwarf irregular galaxy Sagittarius. We use new deep and wide field photometry to trace the surface brightness profile of the galaxy out to ~5.0' (corresponding to ~1600 pc)…

Astrophysics of Galaxies · Physics 2015-06-22 G. Beccari , M. Bellazzini , F. Fraternali , G. Battaglia , S. Perina , A. Sollima , T. A. Oosterloo , V. Testa , S. Galleti

We present circumstantial evidence that the central region of the edge-on S0 galaxy NGC 4570, which harbors a 150 pc scale nuclear disc in addition to its main outer disc, has been shaped under the influence of a small (approx. 500pc) bar.…

Astrophysics · Physics 2009-10-30 Frank C. van den Bosch , Eric Emsellem

An all high-latitude sky survey for cool carbon giant stars in the Galactic halo has revealed 75 such stars, of which the majority are new detections. Of these, more than half are clustered on a Great Circle on the sky which intersects the…

Astrophysics · Physics 2009-10-31 Rodrigo Ibata , Geraint F. Lewis , Michael Irwin , Edward Totten , Thomas Quinn

We have obtained 63 rotation measures (RMs) from polarization observations of southern pulsars, of which 54 are new measurements and 3 are varied from previous values. The new pulsar RM data at high Galactic latitudes are mostly consistent…

Astrophysics · Physics 2009-10-31 J. L. Han , R. N. Manchester , G. J. Qiao

PSR J1905+0154A is a binary millisecond pulsar located in the globular cluster (GC) NGC 6749. It was discovered in 2004 in a search for pulsars in GCs carried out with the Arecibo 305-m radio telescope. The pulsar has a spin period of 3.2…

Thermal images of cold dust in the Central Molecular Zone of the Milky Way, obtained with the far-infrared cameras on-board the Herschel satellite, reveal a 3x10^7 solar masses ring of dense and cold clouds orbiting the Galactic Center.…

Radio continuum observations at 20 and 6 cm of the highly inclined Virgo spiral galaxy NGC 4522 are presented. Both, 20 and 6 cm total emission distributions are asymmetric with an extended component to the west where extraplanar atomic gas…

Astrophysics · Physics 2009-11-10 B. Vollmer , R. Beck , J. D. P. Kenney , J. H. van Gorkom

NGC7217 is an unbarred early-type spiral galaxy having a multi-segment exponential light profile and a system of starforming rings of the unknown origin; it also possesses a circumnuclear gaseous polar disc. We analysed new long slit…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Olga Sil'chenko , Igor Chilingarian , Natalia Sotnikova , Victor Afanasiev

We report the discovery of a new gravitational lens system from the CLASS survey, CLASS B0631+519. VLA, MERLIN and VLBA observations show a doubly-imaged radio core, a doubly-imaged lobe and a second lobe that is probably quadruply-imaged.…

We study a peculiar galaxy NGC 90, a pair member of interacting system Arp 65 (NGC 90/93), using the long-slit spectral observations carried out at the Russian 6m telescope BTA and the available SDSS photometric data. This galaxy…

Astrophysics of Galaxies · Physics 2020-08-12 Anatoly V. Zasov , Anna S. Saburova , Oleg V. Egorov , Alexey V. Moiseev

We report Australia Telescope Compact Array (ATCA) radio-continuum and ROSAT PSPC X-ray observations of the region surrounding the peculiar galaxy pair ESO 295-IG022, lying at the centre of the poor cluster Abell S0102. We identify a radio…

Astrophysics · Physics 2009-11-06 A. M. Read , M. D. Filipovic , W. Pietsch , P. A. Jones

The central region of the Galaxy has been observed at 580, 620 and 1010 MHz with the Giant Metrewave Radio Telescope (GMRT). We detect emission from Sgr-A*, the compact object at the dynamical centre of the Galaxy, and estimate its flux…

Astrophysics · Physics 2009-11-10 Subhashis Roy , A. Pramesh Rao

ESO422-G028 denotes the very center cD-galaxy of the giant radio source B0503-286 (Saripalli et al. 1986, Subrahmanya and Hunstead, 1986). The angular extent of the associated radio structure is about 42.4 arcmin, which corresponds to a…

Astrophysics · Physics 2007-05-23 M. Jamrozy , J. Kerp , U. Klein , K. -H. Mack , L. Saripalli

(Abridged) We present a morphological and structural analysis of the Richness zero cluster ABCG 194, known as a ``linear cluster'', based on a catalogue of 97 galaxies with B magnitudes and redshifts, a ROSAT PSPC image and radio data. The…

Astrophysics · Physics 2007-05-23 Elena Nikogossyan , Florence Durret , Daniel Gerbal , Frederic Magnard

We report high-precision multi-wavelength linear-polarization observations of the bright B9 (or A0) star $\epsilon$ Sagittarii. The polarization shows the distinctive wavelength dependence expected for a rapidly rotating star. Analysis of…

Solar and Stellar Astrophysics · Physics 2024-07-17 Jeremy Bailey , Fiona Lewis , Ian D. Howarth , Daniel V. Cotton , Jonathan P. Marshall , Lucyna Kedziora-Chudczer

We present high-resolution CCD images (FWHM=0.6"-0.7") of the compact gravitational lens system B0218+35.7 obtained at the Nordic Optical Telescope. Using aperture and PSF photometry we detect the two closely separated (335 mas) components…

Astrophysics · Physics 2016-06-08 F. Grundahl , J. Hjorth

We describe the results of a mJy-sensitivity, VLA survey of roughly 1 square degree near the Galactic center at 6 and 20 cm. Catalogs of compact and filamentary structures are given and compared to previous surveys of the region. Eight of…

Astrophysics · Physics 2009-11-13 C. J. Law , F. Yusef-Zadeh , W. D. Cotton

In a global kinematical study of NGC 5055 using high resolution Fabry-Perot, intriguing spectral line profiles have been observed in the center of the galaxy. These profiles seem to indicate a rapidly rotating disk with a radius near 365 pc…

Astrophysics · Physics 2007-05-23 Sebastien Blais-Ouellette

We present a study of the peculiar radio galaxy B 1834+620. It is characterised by the presence of a 420-kpc large edge-brightened radio source which is situated within, and well aligned with, a larger (1.66 Mpc) radio source. Both sources…

Astrophysics · Physics 2009-10-31 Arno P. Schoenmakers , A. G. de Bruyn , H. J. A. Rottgering , H. van der Laan

The Galactic Center lobe is a degree-tall shell seen in radio continuum images of the Galactic center (GC) region. If it is actually located in the GC region, formation models would require massive energy input (e.g., starburst or jet) to…

Astrophysics of Galaxies · Physics 2011-02-11 C. J. Law , D. Backer , F. Yusef-Zadeh , R. Maddalena