NGC 5273

NGC 5273
NGC 5273
	Sloan Digital Sky Survey image of NGC 5273
Observation data (J2000 epoch)
Right ascension	13h 42m 08.380s
Declination	+35° 39′ 15.47″
Redshift	0.00362
Distance	54.1 ± 6.8 Mly (16.6 ± 2.1 Mpc)
Apparent magnitude (V)	11.6; 13.12
Apparent magnitude (B)	14.01
Characteristics
Type	SA0(s)
Apparent size (V)	2.8′ × 2.4′
Other designations
	NGC 5273, UGC 8675, PGC 48521

NGC 5273 is a lenticular galaxy located 54 million light-years^[4] away in the northern constellation of Canes Venatici. This galaxy was discovered by William Herschel on May 1, 1785.^[8] It is positioned 1+1⁄4° to the southeast of the star 25 Canum Venaticorum.^[5]

The morphological classification of this galaxy is SA0(s),^[4] indicating it is lenticular in form. It displays a faint, unbarred spiral structure within a generally elliptical profile.^[9] NGC 5273 is classified as a type 1.5 Seyfert galaxy, with the X-ray emission from its active galactic nucleus undergoing significant absorption.^[10] However, data collected between the year 2000 and 2022 suggest this is a changing–look Seyfert, with the type ranging from 1 to 1.8/1.9.^[11] The activity level shows strong variability, allowing reverberation mapping of the supermassive black hole at the core. This object has an estimated mass of (4.7±1.6)×10⁶ M_☉.^[9]

References

^ ^a ^b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Pahari, Mayukh; et al. (September 2017), "Detection of the high-energy cut-off from the Seyfert 1.5 galaxy NGC 5273", Monthly Notices of the Royal Astronomical Society, 470 (3): 3239–3248, arXiv:1706.02489, Bibcode:2017MNRAS.470.3239P, doi:10.1093/mnras/stx1455.
^ Tully, R. Brent; et al. (August 2016), "Cosmicflows-3", The Astronomical Journal, 152 (2): 21, arXiv:1605.01765, Bibcode:2016AJ....152...50T, doi:10.3847/0004-6256/152/2/50, S2CID 250737862, 50.
^ ^a ^b ^c ^d Merrell, Katie A.; et al. (May 2023), "The Mass of the Black Hole in NGC 5273 from Stellar Dynamical Modeling", The Astrophysical Journal, 949 (1): 13, arXiv:2212.02484, Bibcode:2023ApJ...949...13M, doi:10.3847/1538-4357/acc4bc, 13.
^ ^a ^b ^c O'Meara, Stephen James (2007), Herschel 400 Observing Guide, Cambridge University Press, p. 193, ISBN 9780521858939.
^ ^a ^b Véron-Cetty, M.-P.; Véron, P. (2010), "A catalogue of quasars and active nuclei: 13th edition", Astronomy & Astrophysics, 518 (A10): A10, Bibcode:2010A&A...518A..10V, doi:10.1051/0004-6361/201014188.
^ "NGC 5273", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2023-11-07.
^ Seligman, Courtney, "NGC Objects: NGC 5250 - 5299", Celestial Atlas, retrieved 2023-11-10.
^ ^a ^b Bentz, Misty C.; et al. (November 2014), "The Mass of the Central Black Hole in the Nearby Seyfert Galaxy NGC 5273", The Astrophysical Journal, 796 (1): 8, arXiv:1409.5794, Bibcode:2014ApJ...796....8B, doi:10.1088/0004-637X/796/1/8, S2CID 118540233, 8.
^ Trippe, M. L.; et al. (December 2010), "A Multi-wavelength Study of the Nature of Type 1.8/1.9 Seyfert Galaxies", The Astrophysical Journal, 725 (2): 1749–1767, arXiv:1010.2750, Bibcode:2010ApJ...725.1749T, doi:10.1088/0004-637X/725/2/1749, S2CID 118395311.
^ Neustadt, J. M. M.; et al. (May 2023), "Multiple flares in the changing-look AGN NGC 5273", Monthly Notices of the Royal Astronomical Society, 521 (3): 3810–3829, arXiv:2211.03801, Bibcode:2023MNRAS.521.3810N, doi:10.1093/mnras/stad725.