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Dwingeloo 1

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The visible radius of Dwingeloo 1 is approximately 4.2', which at the distance of 3 Mpc corresponds to about 4 kpc. The neutral hydrogen is detected as far as 6 kpc (7.5') from the center. The total mass of the galaxy is about 1/4 that of the Milky Way out to the measured distance of
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that begin at the ends of the bar at nearly right angles and wind counterclockwise. The length of the arms is up to 180°. The disk of the galaxy is inclined with respect to the observer, with the inclination angle being 50°. The galaxy recedes from the Milky Way at a speed of about 256 km/s.
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In 1999 another estimate was published, claiming a distance of more than 5 Mpc. It was based on the infrared Tully–Fisher relation. As of 2011, the distance to Dwingeloo 1 is thought to be approximately 3 Mpc, based on its likely membership in the IC 342/Maffei group.
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The distribution of the neutral hydrogen in Dwingeloo 1 is typical for barred spiral galaxies—it is rather flat with a minimum in the center or along the bar. The total mass of the neutral hydrogen is estimated at 370–450 million
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Kraan-Korteweg, R. C.; Loan, A. J.; Burton, W. B.; Lahav, O.; Ferguson, H. C.; Henning, P. A.; Lynden-Bell, D. (1994). "Discovery of a nearby spiral galaxy behind the Milky Way".
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Dwingeloo 1 is a highly obscured galaxy, which makes distance determination a difficult problem. The initial estimate, made soon after the discovery and based on the
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plates earlier in the same year, but was not recognized as such. It was also independently discovered a few weeks later by another team of astronomers working with
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Burton, W.B.; Verheijen, M. A. W.; Kraan-Korteweg, R. C.; Henning, P. A. (1996). "Neutral hydrogen in the nearby galaxies Dwingeloo 1 and Dwingeloo 2".
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Huchtmeier, W.K.; Lercher, G.; Seeberger, R.; Saurer, W.; Weinberger, R. (1995). "Two new possible members of the IC342-Maffei1/2 group of galaxies".
913: 445: 1934: 1905: 906: 175: 33: 294: 1924: 945: 1929: 1872: 883: 940: 301: 275: 929: 232: 59: 317: 1180: 762:; Rieke, M. J.; McCarthy, D. (1999). "An Infrared Determination of the Reddening and Distance to Dwingeloo 1". 278:, which searched for neutral hydrogen (HI) radio emissions at the wavelength of 21 cm from objects in the 1394: 1389: 759: 344: 1351: 119: 1939: 1690: 1288: 1278: 1102: 274:
The Dwingeloo 1 galaxy was discovered in 1994 by the Dwingeloo Obscured Galaxy Survey (DOGS) using the
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does not exceed 10% of that of neutral hydrogen. Optical observations detected around 15
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Karachentsev, I. D. (2005). "The Local Group and Other Neighboring Galaxy Groups".
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Heavily obscured barred spiral galaxy in the constellation Cassiopeia
817:"CO Observations of a Galaxy behind the Galactic Plane, Dwingeloo 1" 376:. Dwingeloo 1 is a molecular gas-poor galaxy. The total mass of the 793: 599: 574: 551: 289:
The galaxy was, however, first noted as an unremarkable feature on
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Kuno, Nario; Vila-Vilaro, Baltasar; Nishiyama, Kohta (1996).
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Loan, A.J.; Maddox, S. J.; Lahav, O.; et al. (1996).
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In its overall size and mass, the galaxy is comparable to
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galaxy block the light from the galaxies lying behind it.
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that was used in the DOGS survey and first detected it.
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After the discovery Dwingeloo 1 was classified as a
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(1999). 575:"The IC 342/Maffei Group Revealed" 446:"NASA/IPAC Extragalactic Database" 14: 1901: 1900: 295:Effelsberg 100-m Radio Telescope 946:Cassiopeia in Chinese astronomy 239:and is heavily obscured by the 1: 312:Distance and group membership 36:infrared image of Dwingeloo 1 884:Astronomy Picture of the Day 879:"Galaxy Dwingeloo 1 Emerges" 327:Dwingeloo 1 has two smaller 250:Dwingeloo 1 has two smaller 228:away from the Earth, in the 99:Heliocentric radial velocity 941:List of stars in Cassiopeia 930:Constellation of Cassiopeia 276:Dwingeloo Radio Observatory 1966: 1935:Cassiopeia (constellation) 685:Astronomy and Astrophysics 480:Astronomy and Astrophysics 1898: 1867: 1534: 1463: 936: 262:– and is a member of the 210: 26: 764:The Astronomical Journal 522:The Astronomical Journal 744:10.1093/mnras/280.2.537 697:1995A&A...293L..33H 502:1996A&A...309..687B 450:Results for Dwingeloo 1 345:dwarf spheroidal galaxy 111:Galactocentric velocity 1925:Barred spiral galaxies 318:Tully–Fisher relation 842:10.1093/pasj/48.1.19 357:barred spiral galaxy 222:barred spiral galaxy 1930:IC 342/Maffei Group 1873:Astronomical events 833:1996PASJ...48...19K 786:1999AJ....118..826I 735:1996MNRAS.280..537L 651:1994Natur.372...77K 591:1999ApJS..124...33B 544:2005AJ....129..178K 302:25m radio telescope 264:IC 342/Maffei Group 760:Alonso-Herrero, A. 378:molecular hydrogen 339:, and the second, 329:satellite galaxies 291:Palomar Sky Survey 252:satellite galaxies 235:. It lies in the 211:LEDA 100170, CAS 2 206:Other designations 157:Apparent magnitude 42:Observation data ( 1912: 1911: 1894: 1893: 1863: 1862: 1768: 1767: 1676: 1675: 1530: 1529: 1459: 1458: 389:Triangulum Galaxy 331:. The first one, 280:Zone of Avoidance 245:Triangulum Galaxy 237:Zone of Avoidance 224:about 10 million 215: 214: 191: 162: 1957: 1904: 1903: 1869: 1779: 1750:LBN 114.55+00.22 1687: 1536: 1465: 1375:17156 (Nushagak) 961: 923: 916: 909: 900: 892: 873: 847: 846: 844: 812: 806: 805: 779: 777:astro-ph/9905152 755: 749: 748: 746: 712: 701: 700: 680: 671: 670: 659:10.1038/372077a0 634: 613: 612: 602: 570: 564: 563: 537: 535:astro-ph/0410065 517: 506: 505: 495: 493:astro-ph/9511020 475: 460: 459: 457: 456: 442: 337:irregular galaxy 201: 197: 73: 31: 19: 1965: 1964: 1960: 1959: 1958: 1956: 1955: 1954: 1915: 1914: 1913: 1908: 1890: 1859: 1803: 1764: 1708: 1672: 1526: 1455: 1421:IRAS 23304+6147 1399: 1346: 1283: 1175: 1097: 950: 932: 927: 896: 876: 858: 855: 850: 814: 813: 809: 758:Ivanov, V. D.; 757: 756: 752: 714: 713: 704: 682: 681: 674: 636: 635: 616: 572: 571: 567: 519: 518: 509: 477: 476: 463: 454: 452: 444: 443: 428: 424: 397: 353: 314: 272: 199: 195: 170:Characteristics 103:110.3 ± 0.4 km/ 71: 67:Right ascension 37: 17: 12: 11: 5: 1963: 1961: 1953: 1952: 1947: 1942: 1937: 1932: 1927: 1917: 1916: 1910: 1909: 1899: 1896: 1895: 1892: 1891: 1889: 1888: 1883: 1877: 1875: 1865: 1864: 1861: 1860: 1858: 1857: 1852: 1847: 1842: 1837: 1832: 1827: 1822: 1817: 1811: 1809: 1805: 1804: 1802: 1801: 1796: 1791: 1785: 1783: 1776: 1770: 1769: 1766: 1765: 1763: 1762: 1757: 1752: 1747: 1742: 1737: 1732: 1727: 1722: 1716: 1714: 1710: 1709: 1707: 1706: 1701: 1695: 1693: 1684: 1678: 1677: 1674: 1673: 1671: 1670: 1665: 1660: 1655: 1650: 1645: 1640: 1635: 1630: 1625: 1620: 1615: 1610: 1605: 1600: 1595: 1590: 1585: 1580: 1575: 1570: 1565: 1560: 1555: 1550: 1544: 1542: 1532: 1531: 1528: 1527: 1525: 1524: 1519: 1514: 1509: 1504: 1499: 1494: 1489: 1484: 1479: 1473: 1471: 1461: 1460: 1457: 1456: 1454: 1453: 1448: 1443: 1438: 1433: 1431:PSR J0205+6449 1428: 1423: 1418: 1413: 1407: 1405: 1401: 1400: 1398: 1397: 1392: 1387: 1382: 1377: 1372: 1367: 1362: 1356: 1354: 1348: 1347: 1345: 1344: 1339: 1334: 1329: 1324: 1319: 1314: 1309: 1304: 1299: 1293: 1291: 1285: 1284: 1282: 1281: 1276: 1271: 1266: 1261: 1256: 1251: 1246: 1241: 1236: 1231: 1226: 1221: 1216: 1211: 1206: 1201: 1196: 1191: 1185: 1183: 1177: 1176: 1174: 1173: 1168: 1163: 1158: 1153: 1148: 1143: 1138: 1133: 1128: 1123: 1118: 1113: 1107: 1105: 1099: 1098: 1096: 1095: 1090: 1085: 1080: 1075: 1070: 1065: 1060: 1055: 1050: 1045: 1040: 1035: 1030: 1025: 1020: 1015: 1010: 1005: 1000: 995: 990: 985: 980: 975: 969: 967: 958: 952: 951: 949: 948: 943: 937: 934: 933: 928: 926: 925: 918: 911: 903: 894: 893: 874: 854: 853:External links 851: 849: 848: 807: 794:10.1086/300986 750: 729:(2): 537–549. 702: 672: 614: 600:10.1086/313255 565: 552:10.1086/426368 528:(1): 178–188. 507: 461: 425: 423: 420: 419: 418: 413: 408: 403: 396: 393: 352: 349: 343:, is likely a 313: 310: 271: 268: 213: 212: 208: 207: 203: 202: 192: 182: 181: 178: 172: 171: 167: 166: 165:13.08 (V-band) 163: 153: 152: 147: 137: 136: 122: 116: 115: 112: 108: 107: 101: 95: 94: 91: 85: 84: 81: 75: 74: 69: 63: 62: 57: 51: 50: 39: 38: 32: 24: 23: 15: 13: 10: 9: 6: 4: 3: 2: 1962: 1951: 1948: 1946: 1943: 1941: 1938: 1936: 1933: 1931: 1928: 1926: 1923: 1922: 1920: 1907: 1897: 1887: 1884: 1882: 1879: 1878: 1876: 1874: 1870: 1866: 1856: 1853: 1851: 1848: 1846: 1843: 1841: 1838: 1836: 1833: 1831: 1828: 1826: 1823: 1821: 1818: 1816: 1815:Andromeda VII 1813: 1812: 1810: 1806: 1800: 1797: 1795: 1792: 1790: 1787: 1786: 1784: 1780: 1777: 1775: 1771: 1761: 1758: 1756: 1753: 1751: 1748: 1746: 1743: 1741: 1738: 1736: 1733: 1731: 1728: 1726: 1723: 1721: 1718: 1717: 1715: 1711: 1705: 1702: 1700: 1697: 1696: 1694: 1692: 1688: 1685: 1683: 1679: 1669: 1666: 1664: 1661: 1659: 1656: 1654: 1651: 1649: 1646: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 1626: 1624: 1621: 1619: 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584: 580: 576: 569: 566: 561: 557: 553: 549: 545: 541: 536: 531: 527: 523: 516: 514: 512: 508: 503: 499: 494: 489: 485: 481: 474: 472: 470: 468: 466: 462: 451: 447: 441: 439: 437: 435: 433: 431: 427: 421: 417: 414: 412: 409: 407: 404: 402: 399: 398: 394: 392: 390: 385: 383: 379: 375: 369: 365: 362: 358: 350: 348: 346: 342: 338: 334: 330: 325: 321: 319: 311: 309: 307: 303: 298: 296: 292: 287: 285: 281: 277: 269: 267: 266:of galaxies. 265: 261: 257: 253: 248: 246: 242: 238: 234: 231: 230:constellation 227: 223: 219: 209: 204: 193: 187: 186:Apparent size 183: 179: 177: 173: 168: 164: 158: 154: 151: 150:IC 342/Maffei 148: 146: 142: 138: 134: 130: 127: 123: 121: 117: 113: 109: 106: 102: 100: 96: 92: 90: 86: 82: 80: 76: 70: 68: 64: 61: 58: 56: 55:Constellation 52: 48: 45: 40: 35: 30: 25: 20: 1940:LEDA objects 1829: 1760:Westerhout 5 1730:Heart Nebula 1725:Cassiopeia A 1426:LS I +61 303 895: 882: 863: 860:"NAME Cas 2" 824: 820: 810: 767: 763: 753: 726: 720: 688: 684: 645:(6501): 77. 642: 638: 585:(1): 33–93. 582: 578: 568: 525: 521: 483: 479: 453:. Retrieved 449: 386: 382:H II regions 374:Solar masses 370: 366: 354: 326: 322: 315: 299: 288: 273: 249: 217: 216: 1886:SN 1572 (B) 1835:Dwingeloo 2 1830:Dwingeloo 1 1553:Messier 103 1522:HD 240237 b 1517:HD 240210 b 1487:HD 219134 b 1073:υ (Castula) 988:δ (Ruchbah) 973:α (Schedar) 691:: L33–L36. 486:: 687–701. 401:Dwingeloo 2 361:spiral arms 333:Dwingeloo 2 306:Netherlands 256:Dwingeloo 2 226:light-years 218:Dwingeloo 1 79:Declination 22:Dwingeloo 1 1919:Categories 1668:Trumpler 3 1548:Messier 52 1482:HD 17156 b 1469:Exoplanets 1441:4U 0142+61 1411:BD+60°2522 1008:θ (Marfak) 1003:η (Achird) 770:(2): 826. 455:2006-11-21 422:References 351:Properties 233:Cassiopeia 72:02 56 51.9 60:Cassiopeia 1477:HD 7924 b 1416:Gliese 49 1103:Flamsteed 993:ε (Segin) 827:: 19–22. 609:119907629 560:119385141 284:Milky Way 270:Discovery 241:Milky Way 131:(~3  1906:Category 1855:Maffei 2 1850:Maffei 1 1774:Galaxies 1755:Sh 2-185 1663:NGC 7790 1658:NGC 7789 1653:NGC 1027 1181:Variable 998:ζ (Fulu) 978:β (Caph) 802:15619332 411:Maffei 2 406:Maffei 1 395:See also 335:, is an 120:Distance 114:257 km/s 93:0.000368 89:Redshift 1881:SN 1181 1740:IC 1805 1682:Nebulae 1648:NGC 663 1643:NGC 659 1638:NGC 654 1633:NGC 637 1628:NGC 559 1623:NGC 457 1618:NGC 436 1613:NGC 433 1608:NGC 381 1603:NGC 366 1598:NGC 358 1593:NGC 225 1588:NGC 189 1583:NGC 146 1578:NGC 136 1573:NGC 133 1568:NGC 129 1563:NGC 110 1558:NGC 103 1436:Tycho G 1209:YZ (21) 829:Bibcode 782:Bibcode 731:Bibcode 693:Bibcode 667:4242688 647:Bibcode 587:Bibcode 540:Bibcode 498:Bibcode 304:in the 180:SB(s)cd 145:cluster 1745:KjPn 8 1735:IC 289 1395:240430 1390:240429 1385:240237 1380:240210 1156:48 (A) 865:SIMBAD 800:  665:  639:Nature 607:  558:  416:IC 342 198:× 0.34 188:  159:  1845:IC 10 1825:3C 35 1820:3C 20 1808:Other 1720:3C 58 1713:Other 1502:e (h) 1404:Other 1370:15558 1279:V1405 1274:V1022 965:Bayer 956:Stars 798:S2CID 772:arXiv 663:S2CID 605:S2CID 556:S2CID 530:arXiv 488:arXiv 220:is a 141:Group 47:epoch 44:J2000 1840:MB 3 1704:7635 1451:WR 3 1446:WR 2 1365:7977 1360:7924 1342:8881 1337:8853 1332:8832 1269:V987 1264:V773 1259:V863 1254:V762 1249:V705 1244:V669 1239:V547 1234:V509 1229:V373 889:NASA 689:293L 341:MB 3 260:MB 3 258:and 176:Type 34:WISE 1799:278 1794:185 1789:147 1782:NGC 1699:281 1691:NGC 1327:932 1322:743 1317:297 1312:273 1307:244 1302:196 1297:144 837:doi 790:doi 768:118 739:doi 727:280 655:doi 643:372 595:doi 583:124 548:doi 526:129 484:309 194:4.2 190:(V) 161:(V) 143:or 133:Mpc 129:Mly 1921:: 1352:HD 1289:HR 1224:PZ 1219:AR 1214:AO 1204:WZ 1199:TZ 1171:54 1166:50 1161:49 1151:47 1146:42 1141:12 1136:10 887:. 881:. 868:. 862:. 835:. 825:48 823:. 819:. 796:. 788:. 780:. 766:. 737:. 725:. 719:. 705:^ 687:. 675:^ 661:. 653:. 641:. 617:^ 603:. 593:. 581:. 577:. 554:. 546:. 538:. 524:. 510:^ 496:. 482:. 464:^ 448:. 429:^ 391:. 347:. 297:. 254:– 247:. 126:10 124:~ 1512:g 1507:f 1497:d 1492:c 1194:S 1189:R 1131:9 1126:6 1121:4 1116:2 1111:1 1093:ω 1088:ψ 1083:χ 1078:φ 1068:υ 1063:τ 1058:σ 1053:ρ 1048:π 1043:ο 1038:ξ 1033:ν 1028:μ 1023:λ 1018:κ 1013:ι 922:e 915:t 908:v 891:. 872:. 845:. 839:: 831:: 804:. 792:: 784:: 774:: 747:. 741:: 733:: 699:. 695:: 669:. 657:: 649:: 611:. 597:: 589:: 562:. 550:: 542:: 532:: 504:. 500:: 490:: 458:. 200:′ 196:′ 135:) 105:s 49:)

Index


WISE
J2000
epoch
Constellation
Cassiopeia
Right ascension
Declination
Redshift
Heliocentric radial velocity
s
Distance
10
Mly
Mpc
Group
cluster
IC 342/Maffei
Apparent magnitude
Type
Apparent size
barred spiral galaxy
light-years
constellation
Cassiopeia
Zone of Avoidance
Milky Way
Triangulum Galaxy
satellite galaxies
Dwingeloo 2

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