A world staff of astronomers has performed a long-term multiwavelength monitoring marketing campaign of a close-by narrow-line Seyfert 1 galaxy referred to as SDSS J164100.10+345452.7. Outcomes of the observations, printed March 9 on the pre-print server arXiv, ship essential insights into the character of this object.
Slender-line Seyfert 1 (NLS1) galaxies are a category of active galactic nuclei (AGN) which have all of the properties of kind 1 Seyfert galaxies, however present peculiar traits like slender Balmer traces, robust Fe II emission, and excessive properties within the X-rays.
At a redshift of 0.164, SDSS J164100.10+345452.7 (or J1641 for brief) is a close-by NLS1 detected in radio and gamma-ray bands. Earlier research of J1641 have prompt that it might host an unknown class of relativistic jets, utterly undetectable at low radio frequencies, that’s the place most observations of this NLS1 have been carried out up to now.
Due to this fact, with a view to confirm this and get extra insights into the character of J1641, a bunch of astronomers led by Patrizia Romano of the Brera Observatory in Italy has noticed this AGN in numerous wavelengths utilizing NASA’s Swift spacecraft and the Aalto College Metsähovi Radio Observatory in Finland.
“On this paper, we report on a 2-year multi-wavelength (optical, ultraviolet, and X-ray) monitoring of J1641 with the Neil Gehrels Swift Observatory (Gehrels et al. 2004) that was carried out in 2019–2021 concurrently with 37 GHz observations obtained as a part of the Metsähovi NLS1 monitoring program,” the researchers wrote.
The multiwavelength observations unveiled important variability within the mild curves of J1641 that’s smaller than variability reported within the literature for the perfect six well-known gamma-NLS1s. The time-selected X-ray spectroscopy exhibits that the galaxy is remarkably secure in the course of the two years of monitoring.
Throughout the two-year observational marketing campaign, two distinct radio flaring episodes have been recognized—one annually. Primarily based on the evaluation of the X-ray spectra previous and following the primary radio flare, it was discovered that the typical spectrum of J1641 might be greatest described by an absorbed energy regulation mannequin with a photon index of roughly 1.93, modified by {a partially} masking impartial absorber.
Furthermore, it was discovered that the X-ray spectrum closest to the radio flare, nonetheless, doesn’t require further absorption and is far tougher. The astronomers assume that this factors to the emergence of an extra, tougher spectral element, which they interpret because the jet emission peeking out of a spot within the absorber.
The researchers added that if the radio emission from J1641 is because of a jet, then its energy can be at a degree of 42.54 erg/s. This is likely one of the lowest measured values when put next with different recognized NLS1 galaxies, and harking back to the gamma-NLS1 J0706+3901.
Extra data:
P. Romano et al, Lengthy-term Swift and Metsähovi monitoring of SDSS J164100.10+345452.7 reveals multi-wavelength correlated variability, arXiv (2023). DOI: 10.48550/arxiv.2303.05534
Journal data:
arXiv
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Research explores a close-by narrow-line Seyfert 1 galaxy (2023, March 23)
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