Astronomy:Markarian 493

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Markarian 493
The Seyfert galaxy Markarian 493.
Observation data (J2000 epoch)
ConstellationCorona Borealis
Right ascension 15h 59m 09.62s[1]
Declination+35° 01′ 47.50″[1]
Redshift0.031503[1]
Helio radial velocity9445 ± 3 km/s[1]
Distance447 Mly
Apparent magnitude (V)15.06
Apparent magnitude (B)15.69
Characteristics
TypeSB (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]

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "NED Search results for Markarian 493". http://ned.ipac.caltech.edu/byname?objname=MRK+493&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  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." (in en). The Astronomical Journal 85: 1462–1467. doi:10.1086/112821. ISSN 0004-6256. Bibcode: 1980AJ.....85.1462K. https://articles.adsabs.harvard.edu//full/1980AJ.....85.1462K/0001465.000.html. 
  4. ↑ Lewis, B. M. (October 1984). "Face-on galaxies." (in en). The Astrophysical Journal 285: 453–457. doi:10.1086/162474. ISSN 0004-637X. Bibcode: 1984ApJ...285..453L. https://articles.adsabs.harvard.edu//full/1984ApJ...285..453L/0000455.000.html. 
  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, doi:10.1086/519448, Bibcode: 2007AJ....134..648M 
  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, doi:10.15407/knit2023.05.088, Bibcode: 2023KosNT..29e..88K, http://arxiv.org/abs/2311.12000, 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" (in en). Astronomy and Astrophysics 457 (1): 61–70. doi:10.1051/0004-6361:20065291. ISSN 0004-6361. Bibcode: 2006A&A...457...61R. https://ui.adsabs.harvard.edu/abs/2006A&A...457...61R/abstract. 
  8. ↑ Osterbrock, D. E.; Pogge, R. W. (October 1985). "The spectra of narrow-line Seyfert 1 galaxies." (in en). The Astrophysical Journal 297: 166–176. doi:10.1086/163513. ISSN 0004-637X. Bibcode: 1985ApJ...297..166O. https://articles.adsabs.harvard.edu/pdf/1985ApJ...297..166O. 
  9. ↑ Ulvestad, James S.; Antonucci, Robert R. J.; Goodrich, Robert W. (January 1995). "Radio Properties of Narrow-Lined Seyfert 1 Galaxies" (in en). The Astronomical Journal 109: 81. doi:10.1086/117258. ISSN 0004-6256. Bibcode: 1995AJ....109...81U. https://articles.adsabs.harvard.edu//full/1995AJ....109...81U/0000083.000.html. 
  10. ↑ Paul, Jeremiah D.; Plotkin, Richard M.; Brandt, W. N.; Ellis, Christopher H.; Gallo, Elena; Greene, Jenny E.; Ho, Luis C.; Kimball, Amy E. et al. (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. doi:10.3847/1538-4357/ad67d1. ISSN 0004-637X. Bibcode: 2024ApJ...974...66P. 
  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, 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, doi:10.3847/2041-8213/aaf8ab, http://arxiv.org/abs/1812.08056, retrieved 2025-12-07 



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