FIRST RESULTS FROM A 1.3 cm EXPANDED VERY LARGE ARRAY SURVEY OF MASSIVE PROTOSTELLAR OBJECTS: G35.03+0.35

We report the first results of a survey on 74 narrow-line Seyfert 1 galaxies (NLS1s) carried out in 2015 with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A-configuration. So far, this is the largest survey aimed to image the radio continuum of NLS1s. We produced radio maps in order to compare the general properties of three different samples of objects: radio-quiet NLS1s (RQNLS1s), steep-spectrum radio-loud NLS1s (S-NLS1s), and flat-spectrum radio-loud NLS1s (F-NLS1s). We find that the three classes correspond to different radio morphologies, with F-NLS1s being more compact, and RQNLS1s often showing diffuse emission on kpc scales. We also find that F-NLS1s might be low-luminosity and possibly young blazars, and that S-NLS1s are part of the parent population of F-NLS1s. Dedicated studies to RQNLS1s are needed to fully understand their role in the unification pictures.

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Very Large Array Observations of Candidate High-Mass Protostellar Objects at 7 Millimeters

The Astronomical Journal ◽

10.1086/520334 ◽

2007 ◽

Vol 134 (3) ◽

pp. 906-911 ◽

Cited By ~ 7

Author(s):

Guido Garay ◽

Luis F. Rodríguez ◽

Itziar de Gregorio-Monsalvo

Keyword(s):

High Mass ◽

Large Array ◽

Very Large Array ◽

Protostellar Objects

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

Proceedings of the International Astronomical Union ◽

10.1017/s1743921320004317 ◽

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.

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Study of a wide-area coherent/synchronous system for next generation Very Large Array

2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting ◽

10.1109/ieeeconf35879.2020.9329617 ◽

2020 ◽

Author(s):

Hitoshi Kiuchi

Keyword(s):

Wide Area ◽

Large Array ◽

Next Generation ◽

Very Large Array ◽

Synchronous System

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OH main line masers in the M 82 starburst

Proceedings of the International Astronomical Union ◽

10.1017/s1743921307013543 ◽

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.

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Bipolar outflow of gas in the spiral galaxy NGC 3079

Canadian Journal of Physics ◽

10.1139/p86-100 ◽

1986 ◽

Vol 64 (4) ◽

pp. 531-535 ◽

Cited By ~ 1

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.

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