BTA spectroscopy of J1430+2303 SMBH merger candidate
ATel #15319; Alexei V. Moiseev (SAO RAS), Darya V. Kozlova (UrFU), Sergey S. Kotov (SAO RAS)
on 10 Apr 2022; 17:56 UT
Credential Certification: Alexei Moiseev (moisav@gmail.com)
Subjects: Optical, AGN, Gravitational Waves
The Seyfert galaxy SDSS J143016.05+230344.4 (hereafter, J1430+2303) is recently considered by Jiang et al. (2022) as a SMBH binary candidate predicted to merge within 1-3 years (Atel. #15267). We performed the spectral observations of J1430+2303 with the 6-m telescope BTA of SAO RAS equipped by SCORPIO-2 multi-mode focal reducer in the long-slit mode with a grism provided ~6A resolution in the 4230-8550 spectral range with 1 arcsec slit width. The observations started on Apr 7, 2022, at 20:30 UTC with a total exposure of 40 min.
The comparison with the presented by Jiang et al. (2022) spectrum obtained at the Palomar Hale 5-m telescope on Jan 3, 2022 demonstrated a good agreement between normalised fluxes of the main narrow and broad emission lines (H-alpha, Hbeta, [OIII], [NII], [SII]) in two epochs of observations. However some differences are found in the shape of the broad H-alpha emission line profile: (1) The bright emission component appears in the red wing of the H-alpha at the velocities ~5000 km/s on Apr 7 spectrum. It may correspond to the outburst in He I 6678 emission line (this line was not detected in the previous epoch spectra); (2) Two peaks in the blue wing at -500 and -1300 km/s detected at the Hale telescope spectrum disappeared in the new spectrum.
Acknowledgments. This study was supported by the RFBR grant 19-29-11029.
References:
Jiang et al. 2022, arXiv:2201.11633
Observations of J1430+2303 in SAO RAS
