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NGC 4561

NGC 4561
Hubble Space Telescope image of NGC 4561
Observation data (J2000 epoch)
ConstellationComa Berenices
Right ascension12h 36m 08.137s[1]
Declination+19° 19′ 21.32″[1]
Redshift0.00454±0.00020[2]
Heliocentric radial velocity1,410 km/s[3]
Distance82 ± 14 Mly (25.2 ± 4.3 Mpc)[4]
Group or clusterVirgo Cluster[5]
Apparent magnitude (B)12.70[3]
Characteristics
TypeSB(rs)dm,[6] Sc(dSc)[3]
Number of stars1.23×109 M☉[5]
Apparent size (V)0.727′ × 0.581′[1] (NIR)
Other designations
2MASX J12360813+1919213, NGC 4561, IC 3569, UGC 7768, PGC 42020[7]

NGC 4561 is a barred spiral galaxy in the constellation Coma Berenices. It was discovered by German-British astronomer William Herschel on April 13, 1784.[8] This galaxy is located at a distance of 82 ± 14 million light-years (25.2 ± 4.3 Mpc) from the Milky Way,[4] and is a member of the Virgo Cluster of galaxies.[5] It is 13th magnitude with an angular size of 1.5′.[9]

The morphological classification of NGC 4561 in the De Vaucouleurs system is SB(rs)dm,[6] indicating a barred spiral galaxy (SB) with a transitional inner ring structure (rs), loosely wound spiral arms (d), and an irregular appearance with no bulge component (m). The galactic plane is inclined at an angle of 28° to the plane of the sky, with the major axis aligned along a position angle of 60°.[5] It has a star formation rate of 0.23 M☉·yr−1. The net stellar mass of the galaxy is 1.23×109 M☉.[5]

A nuclear X-ray source was detected in NGC 4561 by Chandra, and was determined to be an active galactic nucleus based on XMM-Newton observations. It has a small supermassive black hole at the source, with a mass of at least 2×104 M☉.[10]

  1. ^ a b c Cite error: The named reference Skrutskie_et_al_2006 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Abazajian_et_al_2009 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Voyer_et_al_2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Haynes_et_al_2019 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Jiménez-Donaire_et_al_2023 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference De_Vaucouleurs_et_al_1991 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference cseligman was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SEDS was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Araya_Salvo_et_al_2012 was invoked but never defined (see the help page).

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