Optical identification and follow-up observations of SRGA J213151.5+491400 A new magnetic cataclysmic variable discovered with the SRG observatory

dc.authorscopusid6603483828
dc.authorscopusid6602750695
dc.authorscopusid55793902700
dc.authorscopusid59005716200
dc.authorscopusid6602084274
dc.authorscopusid56368196400
dc.authorscopusid9247225700
dc.contributor.authorBalman, S.
dc.contributor.authorKhamitov, I.
dc.contributor.authorKolbin, A.
dc.contributor.authorCaliskan, E. Aktekin
dc.contributor.authorBikmaev, I.
dc.contributor.authorOezdoenmez, A.
dc.contributor.authorFisek, S.
dc.date.accessioned2024-06-23T21:37:41Z
dc.date.available2024-06-23T21:37:41Z
dc.date.issued2024
dc.departmentKadir Has Universityen_US
dc.department-temp[Balman, S.; Esenoglu, H. H.; Yelkenci, K. F.; Saygac, A. T.; Guever, T.; Fisek, S.] Istanbul Univ, Fac Sci, Dept Astron & Space Sci, TR-34119 Istanbul, Turkiye; [Balman, S.] Kadir Has Univ, Fac Engn & Nat Sci, TR-34083 Istanbul, Turkiye; [Khamitov, I.; Kolbin, A.; Bikmaev, I.; Irtuganov, E.; Nikolaeva, E.; Sakhibullin, N.] Kazan Fed Univ, Dept Astron & Satellite Geodesy, Kremlevskaya Str 18, Kazan 420008, Russia; [Khamitov, I.; Kilic, Y.] Akdeniz Univ Campus, TUBITAK Natl Observ, TR-07058 Antalya, Turkiye; [Kolbin, A.; Gabdeev, M.] Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia; [Caliskan, E. Aktekin] Suleyman Demirel Univ, Dept Phys, TR-32000 Isparta, Turkiye; [Oezdoenmez, A.; Nasiroglu, I.; Er, H.] Ataturk Univ, Fac Sci, Dept Astron & Space Sci, TR-25240 Erzurum, Turkiye; [Burenin, R.; Gilfanov, M.; Sazonov, N. S. S.; Medvedev, P.] Russian Acad Sci, Space Res Inst, Profsoyuznaya Ul 84-32, Moscow 117997, Russia; [Burenin, R.; Sazonov, N. S. S.] Natl Res Univ, Higher Sch Econ, Moscow 101000, Russia; [Kilic, Y.] Akdeniz Univ, Fac Sci, Dept Space Sci & Technol, TR-07058 Antalya, Turkiye; [Camurdan, D. Zengin] Ege Univ, Sci Fac, Dept Astron & Space Sci, TR-35100 Bornova, Izmir, Turkiye; [Gilfanov, M.] Max Planck Inst Astrophys, Karl-Schwarzschild-Str 1, Postfach 1317, D-85741 Garching, Germany; [Sonbas, E.] Adiyaman Univ, Dept Phys, TR-02040 Adiyaman, Turkiye; [Sonbas, E.] Adiyaman Univ, Astrophys Applicat & Res Ctr, TR-02040 Adiyaman, Turkiyeen_US
dc.description.abstractContext. The paper is comprised of optical identification and multiwavelength studies of a new X-ray source discovered by the Spectrum Roentgen-Gamma (SRG) observatory during the ART-XC survey and its follow-up optical and X-ray observations. Aims. We aim to identify SRGA J213151.5+491400 in the optical wavelengths. We determine spectra and light curves in the optical high and low states to find periodicities in the light curves and resolve emission lines in the system using optical ground-based data. We intend to study the spectral and temporal X-ray characteristics of the new source using the SRG surveys in the high and low states and NICER data in the low state. Methods. We present optical data from telescopes in T & uuml;rkiye (RTT-150 and T100 at the T & Uuml;B & Idot;TAK 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. Using the optical data, we performed astrometry, photometry, spectroscopy, and power spectral analysis of the optical time series. We present optical Doppler tomography along with X-ray data analysis producing light curves and spectra. Results. We detected SRGA J213151.5+491400 in a high state in 2020 (17.9 mag) that decreased by 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, which is consistent with a magnetic cataclysmic variable (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 source. ART-XC detections yield an X-ray flux of (4.0-7.0) x 10-12 erg s-1 cm-2 in the high state. eROSITA detects a dominating hot plasma component (kTmax > 21 keV in the high state) declining to (4.0-6.0) x 10-13 erg s-1 cm-2 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)sigma 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.en_US
dc.description.sponsorshipIKI; KFU [1805, 1824]; SAO RAS; TUG [16ARTT150-949]; RSF [N 23-12-00292]; RFBR [19-32-60048, FZSM-2023-0015]; EROSITA X-ray telescopes aboard the SRG orbital observatory; Deutsches Zentrum fr Luft- und Raumfahrt (DLR); DLR; German eROSITA Consortium; Russian eROSITA Consortium; Russian Space Agency, Russian Academy of Sciences and State Corporation Rosatom; SRG project; Lavochkin Association (NPOL)en_US
dc.description.sponsorshipWe acknowledge TUBITAK National Observatory (TUG), IKI, KFU, and AST for a partial support in using RTT150 (Russian-Turkish 1.5-m telescope in Antalya) with SRG ART-XC project numbers 1805 and 1824. We thank the NICER Observatory for performing the X-ray and TUBITAK National Observatory (TUG) and SAO RAS (Special Astrophysical Observatory of the Russian Academy of Sciences) for the optical observations, particularly Dmitry Oparin for the successfull SCORPIO-1 spectroscopic observations. We thank the NICER calibration team, particularly Craig Markwardt for help with the SCORPEON background analysis and Ron Remillard, for checking the total background, low and high energy noise characteristics of our observation and confirming the soft excess in the data. We acknowledge ATLAS, ZTF, and Gaia for the availability of their data and light curves. H.H.E. thanks TUG for partial support with project number 16ARTT150-949. The analysis of eROSITA X-Ray data has been supported by RSF grant N 23-12-00292. This study was partially funded by RFBR, project number 19-32-60048. E.I. and N.S. were partially supported by the subsidy FZSM-2023-0015 allocated to the Kazan Federal University. This work is based on data from Mikhail Pavlinsky ART-XC and eROSITA X-ray telescopes aboard the SRG orbital observatory. The SRG observatory was built by Roskosmos in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI) in the framework of the Russian Federal Space Program, with the participation of the Deutsches Zentrum fur Luft- und Raumfahrt (DLR). The eROSITA X-ray telescope was built by a consortium of German Institutes led by MPE, and supported by DLR. The SRG spacecraft was designed, built, launched and is operated by the Lavochkin Association and its subcontractors. The eROSITA data used in this work were processed using the eSASS software system developed by the German eROSITA Consortium and proprietary data reduction and analysis software developed by the Russian eROSITA Consortium. The ART-XC and eROSITA teams thank the Russian Space Agency, Russian Academy of Sciences and State Corporation Rosatom for the support of the SRG project and ART-XC telescope and the Lavochkin Association (NPOL) with its partners for the creation and operation of the SRG spacecraft.en_US
dc.identifier.citation0
dc.identifier.doi10.1051/0004-6361/202348455
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.scopus2-s2.0-85191590490
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202348455
dc.identifier.urihttps://hdl.handle.net/20.500.12469/5737
dc.identifier.volume684en_US
dc.identifier.wosWOS:001207450000001
dc.identifier.wosqualityQ1
dc.language.isoenen_US
dc.publisherEdp Sciences S Aen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectradiation mechanisms: thermalen_US
dc.subjectbinaries: closeen_US
dc.subjectstars: magnetic fielden_US
dc.subjectnovaeen_US
dc.subjectcataclysmic variablesen_US
dc.subjectwhite dwarfsen_US
dc.subjectX-rays: binariesen_US
dc.titleOptical identification and follow-up observations of SRGA J213151.5+491400 A new magnetic cataclysmic variable discovered with the SRG observatoryen_US
dc.typeArticleen_US
dspace.entity.typePublication

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