NGC 7418 - Misplaced Pages

Galaxy in the constellation Grus

NGC 7418
NGC 7418 by Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Grus
Right ascension	22 56 36.2
Declination	−37° 01′ 48.3″
Redshift	0.004837 ± 0.000017
Heliocentric radial velocity	1,450 ± 5 km/s
Distance	59.1 ± 8.5 Mly (18.2 ± 2.6 Mpc)
Apparent magnitude (V)	11.0
Characteristics
Type	SAB(rs)cd
Apparent size (V)	3.5′ × 2.6′
Other designations
ESO 406- G025, MCG -06-50-013, PGC 70069

NGC 7418 is an intermediate spiral galaxy located in the constellation Grus. It is located at a distance of circa 60 million light-years from Earth, which, given its apparent dimensions, means that NGC 7418 is about 60,000 light-years across. It was discovered by John Herschel on August 30, 1834.

Characteristics

NGC 7418 has a bright nucleus incorporated into a bar. The bar appears strong in the infrared H-band while in the optical wavelengths it appears weaker or even unbarred. The spiral arms of the galaxy emanate from the end of the bar. The galaxy has four grand design spiral arms. Their inner parts have knots while the outermost are smooth. The galaxy is seen with an inclination of 42 degrees.

In the centre of NGC 7418 is believed to lie a supermassive black hole with an estimated mass between 1 and 15 million (10 M_☉, based on the spiral pitch angle. The centre of the galaxy has also been found to host a massive stellar cluster, with an estimated mass of nearly 60 million (10) M_☉. The existence of this nuclear star cluster doesn't rule out the existence of a supermassive black hole. Galaxies like the Milky Way and the Andromeda Galaxy have been found to host both. The stellar population at the nucleus of NGC 7418 has been found to be quite young, with mean age less than 100 million years, indicating recent star forming activity.

One supernova has been observed in NGC 7418, SN 1983 Z. It was discovered by L. E. Gonzalez at Cerro El Roble 11" west and 52" south of the nucleus. On September 3, 1983 it had an apparent magnitude of 15.5.

Nearby galaxies

NGC 7418 is a member of a galaxy group known as the IC 1459 group. It is a loose group centred at IC 1459 and contains a large number of spiral galaxies. Other members include NGC 7418A, NGC 7421, IC 5264, IC 5269, IC 5269B, IC 5270, and IC 5273. NGC 7421 lies 19.5 arcminutes away and NGC 7418A lies 16.5 arcminutes to the north as seen in the sky. This group, along with the NGC 7582 group, form the Grus cloud, a region of elevated galaxy density. The Grus cloud, along with the nearby Pavo-Indus cloud, lies between the Local Supercluster and Pavo–Indus Supercluster.

The group features both diffuse X-ray emission from the intergalactic medium and HI emission. Based on the presence of both, it has been suggested that the group is in its early stages of assembling from different subgroups. Three HI clouds have been found to be associated with the group, two located near IC 5270 and one near NGC 7418, at its northwest edge, with total mass 6×10 M_☉. These HI clouds are believed to have formed from gas stripped from the galaxies as a result of interactions.

References

^ "NASA/IPAC Extragalactic Database". Results for NGC 7418. Retrieved 2019-01-18.
Seligman, Courtney. "NGC 7418 (= PGC 70069)". Celestial Atlas. Retrieved 19 November 2018.
Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near-Infrared and Optical Morphology of Spiral Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 73–111. arXiv:astro-ph/0206320. Bibcode:2002ApJS..143...73E. doi:10.1086/342340. S2CID 15491635.
Munoz-Mateos, J. C.; Gil de Paz, A.; Boissier, S.; Zamorano, J.; Jarrett, T.; Gallego, J.; Madore, B. F. (April 2007). "Specific Star Formation Rate Profiles in Nearby Spiral Galaxies: Quantifying the Inside-Out Formation of Disks". The Astrophysical Journal. 658 (2): 1006–1026. arXiv:astro-ph/0612017. Bibcode:2007ApJ...658.1006M. doi:10.1086/511812. S2CID 41735449.
^ Davis, Benjamin L.; Berrier, Joel C.; Johns, Lucas; Shields, Douglas W.; Hartley, Matthew T.; Kennefick, Daniel; Kennefick, Julia; Seigar, Marc S.; Lacy, Claud H. S. (20 June 2014). "The Black Hole Mass Function Derived from Local Spiral Galaxies". The Astrophysical Journal. 789 (2): 124. arXiv:1405.5876. Bibcode:2014ApJ...789..124D. doi:10.1088/0004-637X/789/2/124. S2CID 119302157.
Walcher, C. J.; van der Marel, R. P.; McLaughlin, D.; Rix, H.-W.; Boker, T.; Haring, N.; Ho, L. C.; Sarzi, M.; Shields, J. C. (January 2005). "Masses of Star Clusters in the Nuclei of Bulgeless Spiral Galaxies". The Astrophysical Journal. 618 (1): 237–246. arXiv:astro-ph/0409216. Bibcode:2005ApJ...618..237W. doi:10.1086/425977. S2CID 14365007.
Walcher, C. J.; Boker, T.; Charlot, S.; Ho, L. C.; Rix, H.-W.; Rossa, J.; Shields, J. C.; van der Marel, R. P. (October 2006). "Stellar Populations in the Nuclei of Late-Type Spiral Galaxies". The Astrophysical Journal. 649 (2): 692–708. arXiv:astro-ph/0604138. Bibcode:2006ApJ...649..692W. doi:10.1086/505166. S2CID 18882700.
"Circular No. 3867". International Astronomical Union Circular. Central Bureau for Astronomical Telegrams. 23 September 1983.
^ Serra, P.; et al. (25 July 2015). "ASKAP H i imaging of the galaxy group IC 1459". Monthly Notices of the Royal Astronomical Society. 452 (3): 2680–2691. arXiv:1506.04399. Bibcode:2015MNRAS.452.2680S. doi:10.1093/mnras/stv1326.
Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025.
de Vaucouleurs, G.; de Vaucouleurs, A.; Corwin, J. R. (1976). "Second reference catalogue of bright galaxies". Second Reference Catalogue of Bright Galaxies. 1976. Bibcode:1976RC2...C......0D.
Fouque, P.; Proust, D.; Quintana, H.; Ramirez, A.; Proust, D.; Quintana, H.; Ramirez, A. (1993). "Dynamics of the Pavo-Indus and Grus Clouds of Galaxies" (PDF). Astronomy and Astrophysics Supplement Series. 100 (3): 493–500. Bibcode:1993A&AS..100..493F.{{cite journal}}: CS1 maint: multiple names: authors list (link)

External links

NGC 7418 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
NGC 7418 on SIMBAD

v t e Astronomical catalogs
NGC	NGC 7413 NGC 7414 NGC 7415 NGC 7416 NGC 7417 NGC 7418 NGC 7419 NGC 7420 NGC 7421 NGC 7422 NGC 7423
PGC	PGC 70065 PGC 70066 PGC 70067 PGC 70068 PGC 70069 PGC 70070 PGC 70071 PGC 70072 PGC 70073

v t e New General Catalogue 7000 to 7499
7000 7001 7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033 7034 7035 7036 7037 7038 7039 7040 7041 7042 7043 7044 7045 7046 7047 7048 7049 7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060 7061 7062 7063 7064 7065 7066 7067 7068 7069 7070 7071 7072 7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083 7084 7085 7086 7087 7088 7089 7090 7091 7092 7093 7094 7095 7096 7097 7098 7099 7100 7101 7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7112 7113 7114 7115 7116 7117 7118 7119 7120 7121 7122 7123 7124 7125 7126 7127 7128 7129 7130 7131 7132 7133 7134 7135 7136 7137 7138 7139 7140 7141 7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152 7153 7154 7155 7156 7157 7158 7159 7160 7161 7162 7163 7164 7165 7166 7167 7168 7169 7170 7171 7172 7173 7174 7175 7176 7177 7178 7179 7180 7181 7182 7183 7184 7185 7186 7187 7188 7189 7190 7191 7192 7193 7194 7195 7196 7197 7198 7199 7200 7201 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216 7217 7218 7219 7220 7221 7222 7223 7224 7225 7226 7227 7228 7229 7230 7231 7232 7233 7234 7235 7236 7237 7238 7239 7240 7241 7242 7243 7244 7245 7246 7247 7248 7249 7250 7251 7252 7253 7254 7255 7256 7257 7258 7259 7260 7261 7262 7263 7264 7265 7266 7267 7268 7269 7270 7271 7272 7273 7274 7275 7276 7277 7278 7279 7280 7281 7282 7283 7284 7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297 7298 7299 7300 7301 7302 7303 7304 7305 7306 7307 7308 7309 7310 7311 7312 7313 7314 7315 7316 7317 7318 7319 7320 7321 7322 7323 7324 7325 7326 7327 7328 7329 7330 7331 7332 7333 7334 7335 7336 7337 7338 7339 7340 7341 7342 7343 7344 7345 7346 7347 7348 7349 7350 7351 7352 7353 7354 7355 7356 7357 7358 7359 7360 7361 7362 7363 7364 7365 7366 7367 7368 7369 7370 7371 7372 7373 7374 7375 7376 7377 7378 7379 7380 7381 7382 7383 7384 7385 7386 7387 7388 7389 7390 7391 7392 7393 7394 7395 7396 7397 7398 7399 7400 7401 7402 7403 7404 7405 7406 7407 7408 7409 7410 7411 7412 7413 7414 7415 7416 7417 7418 7419 7420 7421 7422 7423 7424 7425 7426 7427 7428 7429 7430 7431 7432 7433 7434 7435 7436 7437 7438 7439 7440 7441 7442 7443 7444 7445 7446 7447 7448 7449 7450 7451 7452 7453 7454 7455 7456 7457 7458 7459 7460 7461 7462 7463 7464 7465 7466 7467 7468 7469 7470 7471 7472 7473 7474 7475 7476 7477 7478 7479 7480 7481 7482 7483 7484 7485 7486 7487 7488 7489 7490 7491 7492 7493 7494 7495 7496 7497 7498 7499
Astronomical catalog List of NGC objects 7001–7840

New General Catalogue 7000 to 7499

Constellation of Grus

Stars

Bayer	α (Alnair) β (Tiaki) γ (Aldhanab) δ δ ε ζ η θ ι κ λ μ μ ν ξ ο π π ρ σ σ τ τ τ υ φ
Variable	RZ CE
HR	8323 8501
HD	208487 (Itonda) 213240 215456
Other	2MASS J22282889–4310262 Gliese 832 PSR J2144−3933 S5-HVS1 WASP-95 WISE 2220−3628

Exoplanets	Gliese 832 b HD 208487 b HD 213240 b τ Gruis b

Galaxies

NGC	7070 7070A 7072 7075 7079 7087 7213 7418 7424 7496 7531 7552 7582 7590
Other	IC 1459 IC 5201

Galaxy clusters	Abell S1063