scholarly journals Chandra,Extreme Ultraviolet Explorer, and Very Large Array Observations of the Active Binary System σ2Coronae Borealis

2003 ◽  
Vol 582 (2) ◽  
pp. 1073-1101 ◽  
Author(s):  
Rachel A. Osten ◽  
Thomas R. Ayres ◽  
Alexander Brown ◽  
Jeffrey L. Linsky ◽  
Anita Krishnamurthi
Keyword(s):  
Binary System ◽  
Extreme Ultraviolet ◽  
Large Array ◽  
Very Large Array

scholarly journals VLA observations of H2O and OH (1612 MHz) maser emission towards OH 231.8+4.2

2002 ◽  
Vol 206 ◽  
pp. 348-351
Author(s):  
Yolanda Gómez ◽  
Luis F. Rodríguez
Keyword(s):  
Binary System ◽  
The Other ◽  
Large Array ◽  
Maser Emission ◽  
Very Large Array ◽  
Bipolar Outflow ◽  
Protoplanetary Nebula

We present Very Large Array (VLA) observations of H2O and OH (1612 MHz) maser emission toward the protoplanetary nebula OH 231.8+4.2. The H2O observations show two features at VLSR of 23.1 and 44.5 km s−1, coinciding in position within error with the SiO (v=1; J=2−1) maser position from Sánchez Contreras et al. (2000). The H2O and SiO masers are most likely tracing the position of QX Pup, the Mira near the center of OH 231.8+4.2. This position is, however, clearly offset by ∼1 from the axis of the bipolar outflow traced by the OH maser emission. These results suggest the presence of a binary system: one invisible star powering the bipolar outflow and the other, the Mira star QX Pup, associated with the H2O and SiO masers. This scenario requires that the two stars have evolved at very similar rates.

Detection of the Neupert Effect in the Corona of an RS Canum Venaticorum Binary System byXMM‐Newtonand the Very Large Array

2002 ◽  
Vol 577 (1) ◽  
pp. 371-376 ◽  
Author(s):  
Manuel Gudel ◽  
Marc Audard ◽  
Kester W. Smith ◽  
Ehud Behar ◽  
Anthony J. Beasley ◽  
...  
Keyword(s):  
Binary System ◽  
Large Array ◽  
Very Large Array ◽  
Neupert Effect

scholarly journals VLA Observations of Orbital Motions in YLW 15

2004 ◽  
Vol 191 ◽  
pp. 137-138
Author(s):  
S. Curiel ◽  
J.M. Girart ◽  
L.F. Rodríguez ◽  
J. Cantó
Keyword(s):  
Binary System ◽  
Total Mass ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Large Array ◽  
Proper Motions ◽  
Very Large Array

AbstractUsing high angular resolution (~ 03) Very Large Array (VLA) observations made at 3.6 cm during the period 1990 to 2002, we report the detection of proper motions in the components of the binary source YLW 15. We find absolute proper motions of the order of 15 km s-1. In addition, the relative astrometry between the two components reveals orbital proper motions that suggest that the total mass of this binary system is ~ 1.7 M⊙, and that VLA 1 is more massive than VLA 2.

Multiwavelength analysis of OH Megamaser galaxies: The case of IRAS11506-3851

2020 ◽  
Vol 15 (S359) ◽  
pp. 347-349
Author(s):  
Carpes P. Hekatelyne ◽  
Thaisa Storchi-Bergmann
Keyword(s):  
Active Galactic Nuclei ◽  
Hubble Space Telescope ◽  
Galactic Nuclei ◽  
Large Array ◽  
Very Large Array ◽  
Star Forming ◽  
Star Forming Regions ◽  
Field Unit ◽  
Mixed Transition ◽  
Integral Field

AbstractWe present Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST) and Very Large Array (VLA) observations of the inner kpc of the OH Megamaser galaxy IRAS 11506-3851. In this work we discuss the kinematics and excitation of the gas as well as its radio emission. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions allowed us to identify a partial ring of star-forming regions surrounding the nucleus with a radius of ≍500 pc. The emission-line ratios and excitation map reveal that the region inside the ring present mixed/transition excitation between those of Starbursts and Active Galactic Nuclei (AGN), while regions along the ring are excited by Starbursts. We suggest that we are probing a buried or fading AGN that could be both exciting the gas and originating an outflow.

scholarly journals OH main line masers in the M 82 starburst

2007 ◽  
Vol 3 (S242) ◽  
pp. 427-431
Author(s):  
M. K. Argo ◽  
A. Pedlar ◽  
T. W. B. Muxlow ◽  
R. J. Beswick
Keyword(s):  
Central Region ◽  
Supernova Remnants ◽  
Main Line ◽  
Line Of Sight ◽  
Starburst Galaxy ◽  
Large Array ◽  
Satellite Line ◽  
Very Large Array

AbstractA study of the distribution of OH gas in the central region of the nearby active starburst galaxy M82 has confirmed two previously known bright masers and revealed several new main line masers. Three of these are seen only at 1665 MHz, one is detected only at 1667 MHz, while the rest are detected in both lines. Observations covering both the 1665 and 1667 MHz lines, conducted with both the Very Large Array (VLA) and the Multi-Element Radio Linked Interferometer Network (MERLIN), have been used to accurately measure the positions and velocities of these features. This has allowed a comparison with catalogued continuum features in the starburst such as HII regions and supernova remnants, as well as known water and satellite line OH masers. Most of the main line masers appear to be associated with known HII regions although the two detected only at 1665 MHz are seen along the same line of sight as known supernova remnants.

Bipolar outflow of gas in the spiral galaxy NGC 3079

1986 ◽  
Vol 64 (4) ◽  
pp. 531-535 ◽  
Author(s):  
Nebojsa Duric ◽  
E. R. Seaquist
Keyword(s):  
Spectral Index ◽  
Spiral Galaxy ◽  
Central Region ◽  
Qualitative Description ◽  
Radio Continuum ◽  
Large Array ◽  
Very Large Array ◽  
Bipolar Outflow ◽  
The Galaxy

Very large array, radio-continuum observations of the edge-on spiral galaxy NGC 3079 are presented. The observations reveal that the nucleus has windlike properties and that the central region of the galaxy exhibits an unusual figure-eight morphology that shows evidence of severe depolarization and a flattening spectral index away from the nucleus. A qualitative description of a model is presented to account for the observed radio properties. It is shown that a wind-driven shock propagating away from the nucleus and focused by the ambient disk gas can give rise to the observed morphology.

scholarly journals realfast: Real-time, Commensal Fast Transient Surveys with the Very Large Array

2018 ◽  
Vol 236 (1) ◽  
pp. 8 ◽  
Author(s):  
C. J. Law ◽  
G. C. Bower ◽  
S. Burke-Spolaor ◽  
B. J. Butler ◽  
P. Demorest ◽  
...  
Keyword(s):  
Real Time ◽  
Large Array ◽  
Very Large Array ◽  
Fast Transient

Observations of minor planets with the very large array

1984 ◽  
Vol 34 (1-4) ◽  
pp. 39-48
Author(s):  
P. K. Seidelmann ◽  
G. H. Kaplan ◽  
K. J. Johnston ◽  
C. M. Wade
Keyword(s):  
Minor Planets ◽  
Large Array ◽  
Very Large Array
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