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	The '''Antennae Galaxies''', also known as '''NGC 4038'''/'''NGC 4039''' and '''Caldwell 60''', are a pair of ] in the ] ]. They are currently going through a ] phase, in which the collision of clouds of gas and dust, with entangled magnetic fields, causes rapid star formation. They were discovered by ] in 1785.<ref name="universe-today">{{cite web		The '''Antennae Galaxies''', also known as '''NGC 4038'''/'''NGC 4039''' and '''Caldwell 60''' are a pair of ] in the ] ]. They are currently going through a ] phase, in which the collision of clouds of gas and dust, with entangled magnetic fields, causes rapid star formation. They were discovered by ] in 1785.<ref name="universe-today">{{cite web
	\| title=Corvus		\| title=Corvus
	\| work=Universe Today		\| work=Universe Today

Revision as of 04:15, 22 December 2019

Antennae Galaxies
Hubble Space Telescope image of NGC 4038 (top) and NGC 4039 (bottom)
Observation data (J2000 epoch)
Constellation	Corvus
Right ascension	12 01 53.0 / 12 01 53.6
Declination	−18° 52′ 10″ / −18° 53′ 11″
Redshift	1642 ± 12 / 1641 ± 9 km/s
Distance	45 Mly / 65 Mly
Apparent magnitude (V)	11.2 / 11.1
Characteristics
Type	SB(s)m pec / SA(s)m pec
Size	500,000 ly (150 kpc)
Apparent size (V)	5′.2 × 3′.1 / 3′.1 × 1′.6
Notable features	Interacting galaxies
Other designations
Ringtail Galaxy, NGC 4038 / 4039, PGC 37967 / 37969, Arp 244, Caldwell 60/61, UGCA 264/265

The Antennae Galaxies, also known as NGC 4038/NGC 4039 and Caldwell 60 are a pair of interacting galaxies in the constellation Corvus. They are currently going through a starburst phase, in which the collision of clouds of gas and dust, with entangled magnetic fields, causes rapid star formation. They were discovered by William Herschel in 1785.

General information

The Antennae Galaxies are undergoing a galactic collision. Located in the NGC 4038 group with five other galaxies, these two galaxies are known as the Antennae Galaxies because the two long tails of stars, gas and dust ejected from the galaxies as a result of the collision resemble an insect's antennae. The nuclei of the two galaxies are joining to become one giant galaxy. Most galaxies probably undergo at least one significant collision in their lifetimes. This is likely the future of our Milky Way when it collides with the Andromeda Galaxy.

Five supernovae have been discovered in NGC 4038: SN 1921A, SN 1974E, SN 2004GT, SN 2007sr and SN 2013dk.

A recent study finds that these interacting galaxies are less remote from the Milky Way than previously thought—at 45 million light-years instead of 65 million light-years.

They are located 0.25° north of 31 Crateris and 3.25° southwest of Gamma Corvi.

The Antennae galaxies also contain a relatively young collection of massive globular clusters that were possibly formed as a result of the collision between the two galaxies. The young age of these clusters is in contrast to the average age of most known globular clusters, around 12 billion years old, with the formation of the globulars likely originating from shockwaves, generated by the collision of the galaxies, compressing large, massive molecular clouds. The densest regions of the collapsing and compressing clouds are believed to be the birthplace of the clusters.

Timeline

About 1.2 billion years ago, the Antennae were two separate galaxies. NGC 4038 was a barred spiral galaxy and NGC 4039 was a spiral galaxy. Before the galaxies collided, NGC 4039 was larger than NGC 4038. 900 million years ago, the Antennae began to approach one another, looking similar to NGC 2207 and IC 2163. 600 million years ago, the Antennae passed through each other, looking like the Mice Galaxies. 300 million years ago, the Antennae's stars began to be released from both galaxies. Today the two streamers of ejected stars extend far beyond the original galaxies, resulting in the antennae shape.

Within 400 million years, the Antennae's nuclei will collide and become a single core with stars, gas, and dust around it. Observations and simulations of colliding galaxies suggest that the Antennae Galaxies will eventually form an elliptical galaxy.

X-ray source

Areas containing large amounts of neon, magnesium, and silicon were found when the Chandra X-ray Observatory analyzed the Antennae Galaxies. These elements are necessary in order for planets that may contain life (as we know it) to form. The clouds imaged contain 16 times as much magnesium and 24 times as much silicon as the Sun.

Image gallery

ESO's VLT observes the Antennae Galaxies.
Antennae Galaxies composite of ALMA and Hubble observations

References

R. W. Sinnott, ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 978-0-933346-51-2.
^ "NASA/IPAC Extragalactic Database". Results for NGC 4038 / 4039. Retrieved 2006-12-07.
Astronomy Picture of the Day Archive (28 April 2017). "Exploring the Antennae". Retrieved 2018-05-01.
"Corvus". Universe Today. Retrieved 2006-12-07.
"List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Retrieved 2015-08-22.
"The Antennae Galaxies Found To Be Closer To Us". Space Daily. 2008-05-12. Retrieved 2008-06-30.
O'Meara, Stephen James (2002). The Caldwell Objects. Cambridge University Press. pp. 240–43. ISBN 978-0-521-82796-6.
Van Den Bergh, Sidney (2001). "van den Bergh, How Did Globular Clusters Form?". The Astrophysical Journal. 559 (2): L113–L114. arXiv:astro-ph/0108298. Bibcode:2001ApJ...559L.113V. doi:10.1086/323754.
J. E. Barnes; L. Hernquist (1992). "Dynamics of interacting galaxies". Annual Review of Astronomy and Astrophysics. 30 (1): 705–742. Bibcode:1992ARA&A..30..705B. doi:10.1146/annurev.aa.30.090192.003421.

Notes

The quoted size is based on an assumed distance around 60 million ly although a more recent study gives a less remote distance of 45 million ly, giving consequently smaller values for the size.

External links

v t e Caldwell catalogue
List	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109
See also	Messier Catalogue Catalogue of Nebulae and Clusters of Stars New General Catalogue Index Catalogue Revised New General Catalogue Herschel 400 Catalogue
Category Commons Portal

v t e New General Catalogue 4000 to 4499
4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499
Astronomical catalog List of NGC objects 4001–5000

New General Catalogue 4000 to 4499

Constellation of Corvus

Stars

Bayer	α (Alchiba) β (Kraz) γ (Gienah) δ (Algorab) ε (Minkar) ζ η
Flamsteed	3 6
Variable	R W RV SX TT TU TV TY (31 Crt) VV
HR	4699
HD	103774 104067 111031
Other	EC 11507-2253 Ross 695 DENIS-P J1228.2−1547 LHS 2520 Stargate VHS J1256–1257

Exoplanets	HD 104067 b

Nebulae	NGC 4361

Galaxies

NGC	4027
Other	Antennae Galaxies (NGC 4038/4039) * Corvus A Dwarf Galaxy

Galaxy clusters	NGC 4038 Group

Astronomical events	SN 2004gt SN 2007sr