Optical identification and follow-up observations of SRGA J213151.5+491400 -- a new magnetic cataclysmic variable discovered with SRG Observatory
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arXiv
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| Format: | Preprint |
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2024
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| author | Balman, Ş. Khamitov, I. Kolbin, A. Çalışkan, E. Aktekin Bikmaev, I. Özdönmez, A. Burenin, R. Kılıç, Y. Esenoğlu, H. H. Yelkenci, K. F. Çamurdan, D. Zengin Gilfanov, M. Nasıroğlu, I. Sonbaş, E. Gabdeev, M. Irtuganov, E. Saygaç, A. T. Nikolaeva, E. Sakhibullin, N. Er, H. Sazonov, S. Medvedev, P. Güver, T. Fişek, S. |
| author_facet | Balman, Ş. Khamitov, I. Kolbin, A. Çalışkan, E. Aktekin Bikmaev, I. Özdönmez, A. Burenin, R. Kılıç, Y. Esenoğlu, H. H. Yelkenci, K. F. Çamurdan, D. Zengin Gilfanov, M. Nasıroğlu, I. Sonbaş, E. Gabdeev, M. Irtuganov, E. Saygaç, A. T. Nikolaeva, E. Sakhibullin, N. Er, H. Sazonov, S. Medvedev, P. Güver, T. Fişek, S. |
| contents | We report results of optical identification and multi-wavelength study of a new polar-type magnetic cataclysmic variable (MCV), SRGA J213151.5+491400, discovered by Spectrum Roentgen-Gamma ($SRG$) observatory in the course of the all-sky survey. We present optical data from telescopes in Turkey (RTT-150 and T100 at the TÜBITAK National Observatory), and in Russia (6-m and 1-m at SAO RAS), together with the X-ray data obtained with $ART-XC$ and $eROSITA$ telescopes aboard $SRG$ and the $NICER$ observatory. We detect SRGA J213151.5+491400 in a high state in 2020 (17.9 mag) that decreases about 3 mag into a low state (21 mag) in 2021. We find only one significant period using optical photometric time series analysis which reveals the white dwarf spin/orbital period to be 0.059710(1) days (85.982 min). The long slit spectroscopy in the high state yields a power law continuum increasing towards the blue with a prominent He II line along with the Balmer line emissions with no cyclotron humps; consistent with MCV nature. Doppler Tomography confirms the polar nature revealing ballistic stream accretion along with magnetic stream during the high state. These characteristics show that the new source is a polar-type MCV. $SRG$ $ART-XC$ detections yield an X-ray flux of (4.0-7.0)$\times$10$^{-12}$ erg cm$^2$ s$^{-1}$ in the high state. $eROSITA$ detects a dominating hot plasma component (kT$_{\rm{max}}$ $>$ 21 keV in the high state) declining to (4.0-6.0)$\times$10$^{-13}$ erg cm$^2$ s$^{-1}$ in 2021 (low state). The $NICER$ data obtained in the low state reveal a two-pole accretor showing a soft X-ray component at (6-7)$σ$ significance with a blackbody temperature of 15-18 eV. A soft X-ray component has never been detected for a polar in the low state before. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_06001 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Optical identification and follow-up observations of SRGA J213151.5+491400 -- a new magnetic cataclysmic variable discovered with SRG Observatory Balman, Ş. Khamitov, I. Kolbin, A. Çalışkan, E. Aktekin Bikmaev, I. Özdönmez, A. Burenin, R. Kılıç, Y. Esenoğlu, H. H. Yelkenci, K. F. Çamurdan, D. Zengin Gilfanov, M. Nasıroğlu, I. Sonbaş, E. Gabdeev, M. Irtuganov, E. Saygaç, A. T. Nikolaeva, E. Sakhibullin, N. Er, H. Sazonov, S. Medvedev, P. Güver, T. Fişek, S. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We report results of optical identification and multi-wavelength study of a new polar-type magnetic cataclysmic variable (MCV), SRGA J213151.5+491400, discovered by Spectrum Roentgen-Gamma ($SRG$) observatory in the course of the all-sky survey. We present optical data from telescopes in Turkey (RTT-150 and T100 at the TÜBITAK National Observatory), and in Russia (6-m and 1-m at SAO RAS), together with the X-ray data obtained with $ART-XC$ and $eROSITA$ telescopes aboard $SRG$ and the $NICER$ observatory. We detect SRGA J213151.5+491400 in a high state in 2020 (17.9 mag) that decreases about 3 mag into a low state (21 mag) in 2021. We find only one significant period using optical photometric time series analysis which reveals the white dwarf spin/orbital period to be 0.059710(1) days (85.982 min). The long slit spectroscopy in the high state yields a power law continuum increasing towards the blue with a prominent He II line along with the Balmer line emissions with no cyclotron humps; consistent with MCV nature. Doppler Tomography confirms the polar nature revealing ballistic stream accretion along with magnetic stream during the high state. These characteristics show that the new source is a polar-type MCV. $SRG$ $ART-XC$ detections yield an X-ray flux of (4.0-7.0)$\times$10$^{-12}$ erg cm$^2$ s$^{-1}$ in the high state. $eROSITA$ detects a dominating hot plasma component (kT$_{\rm{max}}$ $>$ 21 keV in the high state) declining to (4.0-6.0)$\times$10$^{-13}$ erg cm$^2$ s$^{-1}$ in 2021 (low state). The $NICER$ data obtained in the low state reveal a two-pole accretor showing a soft X-ray component at (6-7)$σ$ significance with a blackbody temperature of 15-18 eV. A soft X-ray component has never been detected for a polar in the low state before. |
| title | Optical identification and follow-up observations of SRGA J213151.5+491400 -- a new magnetic cataclysmic variable discovered with SRG Observatory |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2401.06001 |