Markarian 493

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Markarian 493
Image of Markarian 493.png
The Seyfert galaxy Markarian 493.
Observation data (J2000 epoch)
Constellation Corona Borealis
Right ascension 15h 59m 09.62s [1]
Declination +35° 01′ 47.50″ [1]
Redshift 0.031503 [1]
Heliocentric radial velocity 9445 ± 3 km/s [1]
Distance 447 Mly
Apparent magnitude  (V)15.06
Apparent magnitude  (B)15.69
Characteristics
Type SB (r)b, Sy1 [1]
Size~77,900  ly (23.88  kpc) (estimated) [1]
Other designations
2MIG 2183, CGCG 195-003, KIG 0719, UGC 10120, PGC 56573, RBS 1545, SRFS 350, NVSS J155910+350145 [1]

Markarian 493 or UGC 10120, is an active Seyfert galaxy of type 1 [2] located in the constellation of Corona Borealis. The redshift of the galaxy is (z) 0.031 [1] and it was first discovered in the radio survey by astronomers in November 1980. [3]

Contents

Description

Markarian 493 is depicted as a face-on barred spiral galaxy of type SBb. [4] The morphology of the galaxy is very similar to something like MRK 42, with a bright central nucleus present and star formation regions in a form of a tight wound spiral. [5] Imaging also showed a bar and ring structure is present in the galaxy. [6]

The nucleus of Markarian 493 is active and it has been categorized as a narrow-line Seyfert galaxy based on its spectrum. [7] [8] When observed with the Very Large Array (VLA), the source of the galaxy is mainly weak with a component that is unresolved. There is minimal optical polarization of 26%. [9] In 2024, a central component is located with it being mainly surrounded by emission that is faint and extended. There is also a core component with a steep flux spectrum at 9 GHz frequencies. [10]

A study published in 2008, has found the presence of a circumnuclear ring inside its central region. The ring has a total radius of between 350 and 500 parsecs with traces of continuum emission originating from emission-line gas. The star formation rate inside the ring is calculated to be around 2 Mʘ per year, with a Hydrogen-alpha luminosity being 6.7 x 1041 erg s-1. In addition, there are multiple dust spiral arms located outside the ring region. [11] The central supermassive black hole for this galaxy is estimated to be 1.5 x 106 Mʘ. [12]

References

  1. 1 2 3 4 5 6 7 8 "NED Search results for Markarian 493". NASA/IPAC Extragalactic Database. Retrieved 2025-12-07.
  2. ↑ Bonson, K; Gallo, L C; Wilkins, D R; Fabian, A C (2018-04-04). "Variable blurred reflection in the narrow-line Seyfert 1 galaxy Mrk 493". Monthly Notices of the Royal Astronomical Society. 477 (3): 3247–3256. doi: 10.1093/mnras/sty828 . ISSN   0035-8711.
  3. ↑ Kojoian, G.; Tovmasian, Kh M.; Dickinson, D. F.; Dinger, A. S. C. (November 1980). "Radio survey of Markarian galaxies at 6 and 11 cm". The Astronomical Journal. 85: 1462–1467. Bibcode:1980AJ.....85.1462K. doi:10.1086/112821. ISSN   0004-6256.
  4. ↑ Lewis, B. M. (October 1984). "Face-on galaxies". The Astrophysical Journal. 285: 453–457. Bibcode:1984ApJ...285..453L. doi:10.1086/162474. ISSN   0004-637X.
  5. ↑ Marín, Víctor M. Muñoz; Delgado, Rosa M. González; Schmitt, Henrique R.; Fernandes, Roberto Cid; Pérez, Enrique; Storchi-Bergmann, Thaisa; Heckman, Tim; Leitherer, Claus (2007-04-26), "An Atlas of the Circumnuclear Regions of 75 Seyfert Galaxies in the Near-Ultraviolet with the Hubble Space Telescope Advanced Camera for Surveys", The Astronomical Journal, 134 (2): 648–667, arXiv: 0704.3617 , Bibcode:2007AJ....134..648M, doi:10.1086/519448
  6. ↑ Kompaniiets, O. (2023-11-20), "Multiwavelength Properties of the Low-Redshift Isolated Galaxies with Active Nuclei Modelled with Cigale", Kosmìčna Nauka Ì Tehnologìâ, 29 (5): 88–98, arXiv: 2311.12000 , Bibcode:2023KosNT..29e..88K, doi:10.15407/knit2023.05.088 , retrieved 2025-12-07
  7. ↑ Riffel, R.; Rodríguez-Ardila, A.; Pastoriza, M. G. (October 2006). "A 0.8-2.4 μm spectral atlas of active galactic nuclei". Astronomy and Astrophysics. 457 (1): 61–70. arXiv: astro-ph/0605463 . Bibcode:2006A&A...457...61R. doi:10.1051/0004-6361:20065291. ISSN   0004-6361.
  8. ↑ Osterbrock, D. E.; Pogge, R. W. (October 1985). "The spectra of narrow-line Seyfert 1 galaxies". The Astrophysical Journal. 297: 166–176. Bibcode:1985ApJ...297..166O. doi:10.1086/163513. ISSN   0004-637X.
  9. ↑ Ulvestad, James S.; Antonucci, Robert R. J.; Goodrich, Robert W. (January 1995). "Radio Properties of Narrow-Lined Seyfert 1 Galaxies". The Astronomical Journal. 109: 81. Bibcode:1995AJ....109...81U. doi:10.1086/117258. ISSN   0004-6256.
  10. ↑ Paul, Jeremiah D.; Plotkin, Richard M.; Brandt, W. N.; Ellis, Christopher H.; Gallo, Elena; Greene, Jenny E.; Ho, Luis C.; Kimball, Amy E.; Haggard, Daryl (2024-10-01). "Radio Scrutiny of the X-Ray-weak Tail of Low-mass Active Galactic Nuclei: A Novel Signature of High-Eddington Accretion?". The Astrophysical Journal. 974 (1): 66. arXiv: 2404.02423 . Bibcode:2024ApJ...974...66P. doi: 10.3847/1538-4357/ad67d1 . ISSN   0004-637X.
  11. ↑ Popovic, L. C.; Smirnova, A. A.; Kovacevic, J.; Moiseev, A. V.; Afanasiev, V. L. (2008-12-28), "THREE-DIMENSIONAL SPECTROSCOPIC STUDY OF THE LINE-EMITTING REGIONS OF MRK 493", The Astronomical Journal, 137 (3): 3548–3557, arXiv: 0812.4817 , doi:10.1088/0004-6256/137/3/3548
  12. ↑ Adegoke, Oluwashina; Dewangan, Gulab C.; Pawar, Pramod; Pal, Main (2018-12-19), "UV to X-Ray Comptonization Delay in MRK 493", The Astrophysical Journal Letters, 870 (2): L13, arXiv: 1812.08056 , doi: 10.3847/2041-8213/aaf8ab , retrieved 2025-12-07
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