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Discovery of the optical and radio counterpart to the fast X-ray transient EP240315a

Fuente: arXiv

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Hauptverfasser:	Gillanders, J. H., Rhodes, L., Srivastav, S., Carotenuto, F., Bright, J., Huber, M. E., Stevance, H. F., Smartt, S. J., Chambers, K. C., Chen, T. -W., Fender, R., Andersson, A., Cooper, A. J., Jonker, P. G., Cowie, F. J., deBoer, T., Erasmus, N., Fulton, M. D., Gao, H., Herman, J., Lin, C. -C., Lowe, T., Magnier, E. A., Miao, H. -Y., Minguez, P., Moore, T., Ngeow, C. -C., Nicholl, M., Pan, Y. -C., Pignata, G., Rest, A., Sheng, X., Smith, I. A., Smith, K. W., Tonry, J. L., Wainscoat, R. J., Weston, J., Yang, S., Young, D. R.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	High Energy Astrophysical Phenomena
Online-Zugang:	Acceder al recurso
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author	Gillanders, J. H. Rhodes, L. Srivastav, S. Carotenuto, F. Bright, J. Huber, M. E. Stevance, H. F. Smartt, S. J. Chambers, K. C. Chen, T. -W. Fender, R. Andersson, A. Cooper, A. J. Jonker, P. G. Cowie, F. J. deBoer, T. Erasmus, N. Fulton, M. D. Gao, H. Herman, J. Lin, C. -C. Lowe, T. Magnier, E. A. Miao, H. -Y. Minguez, P. Moore, T. Ngeow, C. -C. Nicholl, M. Pan, Y. -C. Pignata, G. Rest, A. Sheng, X. Smith, I. A. Smith, K. W. Tonry, J. L. Wainscoat, R. J. Weston, J. Yang, S. Young, D. R.
author_facet	Gillanders, J. H. Rhodes, L. Srivastav, S. Carotenuto, F. Bright, J. Huber, M. E. Stevance, H. F. Smartt, S. J. Chambers, K. C. Chen, T. -W. Fender, R. Andersson, A. Cooper, A. J. Jonker, P. G. Cowie, F. J. deBoer, T. Erasmus, N. Fulton, M. D. Gao, H. Herman, J. Lin, C. -C. Lowe, T. Magnier, E. A. Miao, H. -Y. Minguez, P. Moore, T. Ngeow, C. -C. Nicholl, M. Pan, Y. -C. Pignata, G. Rest, A. Sheng, X. Smith, I. A. Smith, K. W. Tonry, J. L. Wainscoat, R. J. Weston, J. Yang, S. Young, D. R.
contents	Fast X-ray Transients (FXTs) are extragalactic bursts of soft X-rays first identified >10 years ago. Since then, nearly 40 events have been discovered, although almost all of these have been recovered from archival Chandra and XMM-Newton data. To date, optical sky surveys and follow-up searches have not revealed any multi-wavelength counterparts. The Einstein Probe, launched in January 2024, has started surveying the sky in the soft X-ray regime (0.5-4 keV) and will rapidly increase the sample of FXTs discovered in real time. Here, we report the first discovery of both an optical and radio counterpart to a distant FXT, the fourth source publicly released by the Einstein Probe. We discovered a fast-fading optical transient within the 3 arcmin localisation radius of EP240315a with the all-sky optical survey ATLAS, and our follow-up Gemini spectrum provides a redshift, z=4.859+/-0.002. Furthermore, we uncovered a radio counterpart in the S-band (3.0 GHz) with the MeerKAT radio interferometer. The optical (rest-frame UV) and radio luminosities indicate the FXT most likely originates from either a long gamma-ray burst or a relativistic tidal disruption event. This may be a fortuitous early mission detection by the Einstein Probe or may signpost a mode of discovery for high-redshift, high-energy transients through soft X-ray surveys, combined with locating multi-wavelength counterparts.
format	Preprint
id	arxiv_https___arxiv_org_abs_2404_10660
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Discovery of the optical and radio counterpart to the fast X-ray transient EP240315a Gillanders, J. H. Rhodes, L. Srivastav, S. Carotenuto, F. Bright, J. Huber, M. E. Stevance, H. F. Smartt, S. J. Chambers, K. C. Chen, T. -W. Fender, R. Andersson, A. Cooper, A. J. Jonker, P. G. Cowie, F. J. deBoer, T. Erasmus, N. Fulton, M. D. Gao, H. Herman, J. Lin, C. -C. Lowe, T. Magnier, E. A. Miao, H. -Y. Minguez, P. Moore, T. Ngeow, C. -C. Nicholl, M. Pan, Y. -C. Pignata, G. Rest, A. Sheng, X. Smith, I. A. Smith, K. W. Tonry, J. L. Wainscoat, R. J. Weston, J. Yang, S. Young, D. R. High Energy Astrophysical Phenomena Fast X-ray Transients (FXTs) are extragalactic bursts of soft X-rays first identified >10 years ago. Since then, nearly 40 events have been discovered, although almost all of these have been recovered from archival Chandra and XMM-Newton data. To date, optical sky surveys and follow-up searches have not revealed any multi-wavelength counterparts. The Einstein Probe, launched in January 2024, has started surveying the sky in the soft X-ray regime (0.5-4 keV) and will rapidly increase the sample of FXTs discovered in real time. Here, we report the first discovery of both an optical and radio counterpart to a distant FXT, the fourth source publicly released by the Einstein Probe. We discovered a fast-fading optical transient within the 3 arcmin localisation radius of EP240315a with the all-sky optical survey ATLAS, and our follow-up Gemini spectrum provides a redshift, z=4.859+/-0.002. Furthermore, we uncovered a radio counterpart in the S-band (3.0 GHz) with the MeerKAT radio interferometer. The optical (rest-frame UV) and radio luminosities indicate the FXT most likely originates from either a long gamma-ray burst or a relativistic tidal disruption event. This may be a fortuitous early mission detection by the Einstein Probe or may signpost a mode of discovery for high-redshift, high-energy transients through soft X-ray surveys, combined with locating multi-wavelength counterparts.
title	Discovery of the optical and radio counterpart to the fast X-ray transient EP240315a
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2404.10660