Gruppa galaktik M101
Gruppa M101
Igor' Drozdovskii
Po sravneniyu s drugimi gruppami, gruppa galaktiki M 101 s ee sputnikami vydelyaetsya svoim dalekim (2.6 Mpk, |SGB|=23°) raspolozheniem ot ploskosti Mestnogo Sverhskopleniya.
V etoi gruppe ne udalos' zaregistrirovat' ellipticheskie i sferoidal'nye galaktiki razmerom bol'she 1 kpk. Kak i v sluchae gruppy NGC 5236, v dominiruyushei galaktike otsutstvuet baldzh i sushestvuet sil'naya raznica v lineinyh razmerah i svetimostyah dominiruyushei galaktiki i ostavshihsya chlenov (>3m). Massa M 101 prevyshaet summarnuyu massu ostal'nyh chlenov bolee chem v 6 raz.
Dominirovanie M 101 sredi ostal'nyh sputnikov pozvolyaet nam nadeyatsya, chto ona nahodit'sya vblizi dinamicheskogo centra gruppy. Tak i est': <Vk-V1>=(+124) km/s. Ocenka rasstoyaniya do M 101 29.m19 pochti sovpadaet so srednim znacheniem 29.m090.m15, poluchennym dlya vseh chlenov gruppy. V proekcii na nebesnuyu sferu M 101 ne zanimaet kakoe-libo ekscentricheskoe polozhenie po otnosheniyu k svoim sputnikam.
Takzhe stoit upomyanut' o morfologicheskoi odnorodnosti chlenov etoi gruppy. V gruppe ne soderzhat'sya galaktiki morfologicheskih tipov ran'she chem Sc. Harakternoe vremya peresecheniya v gruppe otnositel'no bol'shoe. Mediana krugovyh keplerovskih periodov t1k sostavlyaet 0.39 1/H. V etom otnoshenii gruppa M101 predstavlyaet soboi v nekotorm rode ryhluyu sistemu eshe ne prishedshuyu v sostoyanie virial'nogo ravnovesiya. Esli gruppa kak celoe szhimaetsya, galaktiki na blizhnem krayu dolzhny imet' bol'shie luchevye skorosti, chem galaktiki na dal'nem. K sozhaleniyu, netochnosti v ocenki rasstoyanii do galaktik etoi gruppy (okolo 0.3m) sravnimye s maksimal'nym radiusom gruppy (okolo 700 kpk) ne pozvolyayut nam uverenno vyyavit' dannyi effekt.
Imya | RA | Dec | tip | v | vLG1 | i | B | B-V | razm. | D |
---|---|---|---|---|---|---|---|---|---|---|
N5204 | 13 27.7 | 58 41 | SA(s)m | 204 | 332 | 56 | 11.73 | 0.41 | 5.0x3.0 | 4.92 |
U8508 ? | 13 28.8 | 55 10 | IAm | 63 | 176 | 54 | 14.40 | * | 1.7x1.0 | |
N5229 | 13 32.0 | 48 10 | 364 | 446 | 84 | * | * | |||
N5238 | 13 32.7 | 51 52 | 234 | 333 | 37 | * | * | 5.18 | ||
U8659 ? | 13 38.7 | 55 41 | * | * | * | * | * | |||
U8837 | 13 52.9 | 54 9 | 141 | 257 | 67 | 13.81 | 0.43 | 8.32 | ||
U8914 ? | 13 57.3 | 52 36 | * | * | * | * | * | |||
A1400+54 | 14 0.7 | 54 9 | 165 | 284 | * | * | * | |||
N5457,M101 | 14 1.4 | 54 35 | SAB(rs)cd | 242 | 363 | 24 | 8.31 | 0.45 | 28.8x26.9 | 7.4 |
N5474 | 14 3.3 | 53 54 | SA(s)cd p | 277 | 396 | 17 | 11.28 | 0.49 | 4.8x4.3 | 7.18 |
N5477 | 14 3.8 | 54 42 | 312 | 435 | 45 | 14.36 | 0.35 | 7.73 | ||
N5585 | 14 18.2 | 56 58 | 306 | 443 | 50 | 11.20 | 0.46 | 5.70 | ||
U9405 | 14 33.9 | 57 28 | 222 | 367 | 52 | * | * | 7.62 |
Opisanie: RA(h:m)/Dec(d:m) - pryamoe voshozhdenie (chasy:minuty)/sklonenie
na epohu 1950.0;
Tip - morfologicheskii tip;
v - luchevaya geliocentricheskaya skorost' ;
vLG1 - luchevaya skorost', ispravlennaya za dvizhenie Solnca;
i - naklon galaktiki po otnosheniyu k kartinnoi ploskosti (v gradusah);
B - polnaya zv.velichina v fil'tre B;
B-V - polnyi pokazatel' cveta;
razm. - standartnyi razmer v uglovyh minutah;
D - rasstoyanie do galaktiki (v Mpk).
Sokrasheniya:
M - Messier, N - NGC, U - UGC, UA - UGCA.
(Ispol'zovany materialy iz statei
"The Local Group in comparison with other nearby groups of galaxies",
I.D. Karachentsev, 1996, A&A, v.305, p.33 i
Karachentsev, I.D., Kopylov, A.I., Kopylova, F.G., 1994,
"Distance moduli in M101 group from brightest stars",
Bull. Spec. Astrophys. Obs., v.38,, p.5.)
Literatura
- Drozdovsky I.O., Karachentsev I.D., 1998, A&ASS, v.131, p. 1
- Schmidt K.-H., Boller T.: 1992 Astron. Nachr., v.313, p. 189
- Schmidt K.-H., Priebe A., Boller T.: 1993 Astron. Nachr., v.314, p. 371
Vernut'sya v stat'yu "Mestnoe Sverhskoplenie".
Publikacii s klyuchevymi slovami:
blizhaishie galaktiki - gruppa M 101 - M 101 - gruppa galaktik
Publikacii so slovami: blizhaishie galaktiki - gruppa M 101 - M 101 - gruppa galaktik | |
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