A search for radio emission from double-neutron star merger GW190425 using Apertif

被引：18

作者：

Boersma, O. M. ^{[1
,2
]}

van Leeuwen, J. ^{[1
,2
]}

Adams, E. A. K. ^{[2
,3
]}

Adebahr, B. ^{[4
]}

Kutkin, A. ^{[2
,5
]}

Oosterloo, T. ^{[2
,3
]}

de Blok, W. J. G. ^{[2
,3
,6
]}

van den Brink, R. ^{[2
,7
]}

Coolen, A. H. W. M. ^{[2
]}

Connor, L. ^{[8
]}

Damstra, S. ^{[2
]}

Denes, H. ^{[2
]}

Hess, K. M. ^{[2
,3
]}

van der Hulst, J. M. ^{[3
]}

Hut, B. ^{[2
]}

Ivashina, M. ^{[9
]}

Loose, G. M. ^{[2
]}

Lucero, D. M. ^{[10
]}

Maan, Y. ^{[2
]}

Mika, A. ^{[2
]}

Moss, V. A. ^{[2
,11
,12
]}

Mulder, H. ^{[2
]}

Oostrum, L. C. ^{[1
]}

Ruiter, M. ^{[2
]}

van der Schuur, D. ^{[2
]}

Smits, R. ^{[2
]}

Vermaas, N. J. ^{[2
]}

Vohl, D. ^{[2
]}

Ziemke, J. ^{[2
,13
]}

机构：

[1] Univ Amsterdam, Anton Pannekoek Inst, Postbus 94249, NL-1090 GE Amsterdam, Netherlands

[2] ASTRON, Netherlands Inst Radio Astron, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands

[3] Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[4] Ruhr Univ Bochum AIRUB, Astron Inst, Univ Str 150, D-44780 Bochum, Germany

[5] Lebedev Phys Inst, Astro Space Ctr, Profsoyuznaya Str 84-32, Moscow 117997, Russia

[6] Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa

[7] Tricas Ind Design & Engn, Zwolle, Netherlands

[8] CALTECH, Cahill Ctr Astron, Pasadena, CA 91125 USA

[9] Chalmers Univ Technol, Dept Elect Engn, Gothenburg, Sweden

[10] Virginia Polytech Inst & State Univ, Dept Phys, 50 West Campus Dr, Blacksburg, VA 24061 USA

[11] CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia

[12] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

[13] Univ Groningen, Ctr Informat Technol, POB 11044, NL-9700 CA Groningen, Netherlands

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 650卷

基金：

荷兰研究理事会; 欧洲研究理事会;

关键词：

gravitational waves; stars: neutron; radio continuum: stars;

D O I：

10.1051/0004-6361/202140578

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Detection of the electromagnetic emission from coalescing binary neutron stars (BNS) is important for understanding the merger and afterglow.Aims. We present a search for a radio counterpart to the gravitational-wave (GW) source GW190425, a BNS merger, using Apertif on the Westerbork Synthesis Radio Telescope (WSRT).Methods. We observed a field of high probability in the associated localisation region for three epochs at Delta T=68, 90, 109 d post merger. We identified all sources that exhibit flux variations consistent with the expected afterglow emission of GW190425. We also looked for possible transients. These are sources that are only present in one epoch. In addition, we quantified our ability to search for radio afterglows in the fourth and future observing runs of the GW detector network using Monte Carlo simulations.Results. We found 25 afterglow candidates based on their variability. None of these could be associated with a possible host galaxy at the luminosity distance of GW190425. We also found 55 transient afterglow candidates that were only detected in one epoch. All of these candidates turned out to be image artefacts. In the fourth observing run, we predict that up to three afterglows will be detectable by Apertif.Conclusions. While we did not find a source related to the afterglow emission of GW190425, the search validates our methods for future searches of radio afterglows.

引用

页数：9

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