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On the optical counterparts of radio transients and variables

On the optical counterparts of radio transients and variables
On the optical counterparts of radio transients and variables

We investigate the relation between the radio (Fr) and optical (Fo) flux densities of a variety of classes of radio transients and variables, with the aim of analysing whether this information can be used, in the future, to classify such events. Using flux density values between 1 and 10 GHz and the optical bands V and R, we build a sample with a total of 12 441 Fr and Fo measurements. The sample contains both Galactic objects, such as stellar sources and X-ray binaries, and extragalactic objects, such as gamma-ray bursts and quasars. By directly comparing the two parameters, it is already possible to distinguish between the Galactic and extragalactic populations. Although individual classes are harder to separate from the Fr - Fo parameter space to a high accuracy, and can only provide approximations, the basic approach provides an already useful foundation to develop a more accurate classification technique. In addition, we illustrate how example objects from different classes move in the parameter space as they evolve over time, offering a feature that could be used to reduce the confusion between classes. A small, blind test of the classification performance is also undertaken using a catalogue of VLA FIRST transient and variable sources, to demonstrate the advantages and current limitations of the approach.With more multiwavelength data becoming available in the future,we discuss other classification techniques which the Fr -Fo method could be combined with and potentially become an important part of an automatic radio transient classification system.

Galaxies: statistics, Quasars: general, Radio continuum: general, Radio continuum: transients, Stars: statistics, Stars: variables: general
0035-8711
2481-2504
Stewart, A. J.
f892bf1d-c923-405d-a33b-cc2935b3fc20
Muñoz-Darias, T.
3ce85aef-763c-4783-a13e-586115731bc2
Fender, R. P.
c802ddfc-25a3-4c0e-899d-11c405c705d1
Pietka, M.
861def41-c31f-4e1e-a576-e6cf828b5c7c
Stewart, A. J.
f892bf1d-c923-405d-a33b-cc2935b3fc20
Muñoz-Darias, T.
3ce85aef-763c-4783-a13e-586115731bc2
Fender, R. P.
c802ddfc-25a3-4c0e-899d-11c405c705d1
Pietka, M.
861def41-c31f-4e1e-a576-e6cf828b5c7c

Stewart, A. J., Muñoz-Darias, T., Fender, R. P. and Pietka, M. (2018) On the optical counterparts of radio transients and variables. Monthly Notices of the Royal Astronomical Society, 479 (2), 2481-2504. (doi:10.1093/MNRAS/STY1671).

Record type: Article

Abstract

We investigate the relation between the radio (Fr) and optical (Fo) flux densities of a variety of classes of radio transients and variables, with the aim of analysing whether this information can be used, in the future, to classify such events. Using flux density values between 1 and 10 GHz and the optical bands V and R, we build a sample with a total of 12 441 Fr and Fo measurements. The sample contains both Galactic objects, such as stellar sources and X-ray binaries, and extragalactic objects, such as gamma-ray bursts and quasars. By directly comparing the two parameters, it is already possible to distinguish between the Galactic and extragalactic populations. Although individual classes are harder to separate from the Fr - Fo parameter space to a high accuracy, and can only provide approximations, the basic approach provides an already useful foundation to develop a more accurate classification technique. In addition, we illustrate how example objects from different classes move in the parameter space as they evolve over time, offering a feature that could be used to reduce the confusion between classes. A small, blind test of the classification performance is also undertaken using a catalogue of VLA FIRST transient and variable sources, to demonstrate the advantages and current limitations of the approach.With more multiwavelength data becoming available in the future,we discuss other classification techniques which the Fr -Fo method could be combined with and potentially become an important part of an automatic radio transient classification system.

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More information

Accepted/In Press date: 20 June 2018
e-pub ahead of print date: 28 June 2018
Published date: 11 September 2018
Keywords: Galaxies: statistics, Quasars: general, Radio continuum: general, Radio continuum: transients, Stars: statistics, Stars: variables: general

Identifiers

Local EPrints ID: 425968
URI: http://eprints.soton.ac.uk/id/eprint/425968
ISSN: 0035-8711
PURE UUID: bfe7041e-10e7-40ad-b5be-47e54582c2d2

Catalogue record

Date deposited: 08 Nov 2018 17:30
Last modified: 08 Nov 2018 17:30

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