SDSS J211852.96−073227.5

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SDSS J211852.96-073227.5.
The Narrow-line Seyfert galaxy SDSS J211852.96-073227.5
Observation data (J2000.0 epoch)
ConstellationAquarius
Right ascension21h 18m 52.96s[1]
Declination−07° 32′ 27.60″[1]
Redshift0.260110[1]
Heliocentric radial velocity77,979 km/s[1]
Distance3.129 Gly
Characteristics
TypeCandidate BLAGN[1]
Size~337,000 ly (103.2 kpc) (estimated)[1]
Other designations
2MASS J21185296-0732275, IVS B2116-077, THING 587726877802758324, NVSS J211852-073229, TXS 2116-077, OCARS 2116-077[1] PGC 3431405

SDSS J211852.96−073227.5 is a narrow-line Seyfert galaxy[2] with an active galactic nucleus located in the constellation of Aquarius. The redshift of the object is (z) 0.26[1] and it was first discovered in April 2018 by astronomers who categorized the object as gamma-ray emitting.[3]

Description

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SDSS J211852.96−073227.5 is classified as a late stage galaxy merger involving two late-type galaxies.[4][5][6] When imaged, it is found to have two clearly resolved nuclei that is separated from each other by 12 kiloparsecs. Further observations, showed the merging companion galaxy at the same redshift, has presence of emission lines in its optical spectrum, confirming it a Type 2 Seyfert galaxy. A ring of Hydrogen-alpha material is shown surrounding the main galaxy's nucleus, with a curved filament feature connecting both nuclei. The supermassive black hole mass of the primary galaxy is estimated to be 3 x 107 Mʘ.[7][8] Young stellar population of stars mainly between 0.5 and 2.5 billion years old, are located mainly inside the inner region of the companion galaxy.[8]

Imaging made with Very Long Baseline Array (VLBA), showed SDSS J211852.95−073227.5 has a complex radio structure. When imaged, it has a core-jet morphology with a radio core showing an inverted radio spectrum at high frequencies while at lower frequencies, the spectrum is steep. The core is also found variable given that variations are shown.[9] There is evidence of an extended structure on parsec-scales imaged at 22 and 43 GHz frequencies based on imaging by VLBI Exploration of Radio Astrometry (VERA).[10] A dark matter halo of material is surrounding the core region.[7]

Further imaging, has found there is a radio jet emerging outwards from the galaxy.[11] This has been suggested to be triggered during the merging process, given the fact its kinematic age is much younger compared to the beginning of the merger between 0.5 and 2 billion years ago.[9][8] VLBA has shown the jet components are mainly weak with the entire jet being perpendicular towards the axis of the galaxy.[9]

References

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  1. ^ a b c d e f g h "NED Search results for SDSS J211852.96-073227.5". NASA/IPAC Extragalactic Database. Retrieved 2025-11-08.
  2. ^ Yang, Hui; Yuan, Weimin; Yao, Su; Pan, Hai-Wu; Komossa, S. (2018-07-26), On the multiwavelength properties of several γ-ray detected narrow-line Seyfert 1 galaxies, arXiv:1807.10074, Bibcode:2018rnls.confE..16Y, retrieved 2025-11-08
  3. ^ Yang, Hui; Yuan, Weimin; Yao, Su; Li, Ye; Zhang, Jin; Zhou, Hongyan; Komossa, S; Liu, He-Yang; Jin, Chichuan (2018-04-16). "SDSS J211852.96−073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy". Monthly Notices of the Royal Astronomical Society. 477 (4): 5127–5138. doi:10.1093/mnras/sty904. ISSN 0035-8711.
  4. ^ Järvelä, E.; Berton, M.; Ciroi, S.; Congiu, E.; Lähteenmäki, A.; Mille, F. Di (2020-04-01). "SDSS J211852.96−073227.5: The first non-local, interacting, late-type intermediate Seyfert galaxy with relativistic jets" (PDF). Astronomy & Astrophysics. 636: L12. arXiv:2004.07092. Bibcode:2020A&A...636L..12J. doi:10.1051/0004-6361/202037826. ISSN 0004-6361.
  5. ^ Kohler, Susanna (2020-04-08). "Jets from a Galaxy Collision". AAS Nova. Retrieved 2025-11-08.
  6. ^ Yao, Su; Komossa, S (2023-05-12). "Multiwavelength variability of γ-ray emitting narrow-line Seyfert 1 galaxies". Monthly Notices of the Royal Astronomical Society. 523 (1): 441–452. doi:10.1093/mnras/stad1415. ISSN 0035-8711.
  7. ^ a b Argüelles, C. R.; Rueda, J. A.; Ruffini, R. (2024-01-01). "Baryon-induced Collapse of Dark Matter Cores into Supermassive Black Holes". The Astrophysical Journal Letters. 961 (1): L10. arXiv:2312.07461. Bibcode:2024ApJ...961L..10A. doi:10.3847/2041-8213/ad1490. ISSN 2041-8205.
  8. ^ a b c Paliya, Vaidehi S.; Pérez, Enrique; García-Benito, Rubén; Ajello, Marco; Prada, Francisco; Alberdi, Antxon; Suh, Hyewon; Chandra, C. H. Ishwara; Domínguez, Alberto; Marchesi, Stefano; Matteo, Tiziana Di; Hartmann, Dieter; Chiaberge, Marco (2020-04-01). "TXS 2116−077: A Gamma-Ray Emitting Relativistic Jet Hosted in a Galaxy Merger". The Astrophysical Journal. 892 (2): 133. arXiv:2004.02703. Bibcode:2020ApJ...892..133P. doi:10.3847/1538-4357/ab754f. ISSN 0004-637X.
  9. ^ a b c Shao, Xi; Gu, Minfeng; Chen, Yongjun; Yang, Hui; Yao, Su; Yuan, Weimin; Shen, Zhiqiang (2023-02-01). "The Radio Structure of the γ-Ray Narrow-line Seyfert 1 Galaxy SDSS J211852.96-073227.5". The Astrophysical Journal. 943 (2): 136. arXiv:2211.16705. Bibcode:2023ApJ...943..136S. doi:10.3847/1538-4357/aca762. ISSN 0004-637X.
  10. ^ Takamura, Mieko; Hada, Kazuhiro; Honma, Mareki; Oyama, Tomoaki; Yamauchi, Aya; Suzuki, Syunsaku; Hagiwara, Yoshiaki; Orienti, Monica; D’Ammando, Filippo; Park, Jongho; Kam, Minchul; Doi, Akihiro (2023-07-01). "Probing the Heart of Active Narrow-line Seyfert 1 Galaxies with VERA Wideband Polarimetry". The Astrophysical Journal. 952 (1): 47. arXiv:2306.03139. Bibcode:2023ApJ...952...47T. doi:10.3847/1538-4357/acd9a8. ISSN 0004-637X.
  11. ^ McRae, Mike (2020-04-11). "For The First Time, Astronomers Photograph a Jet Spewing Out From Colliding Galaxies". ScienceAlert. Retrieved 2025-11-08.
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