2005A&A...437..339M


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.16CET03:49:11

2005A&A...437..339M - Astronomy and Astrophysics, volume 437, 339-343 (2005/7-1)

The proper motion of the Magellanic Clouds: The UCAC2-Hipparcos inconsistency.

MOMANY Y. and ZAGGIA S.

Abstract (from CDS):

Using the USNO CCD Astrograph all-sky Catalog (UCAC2), we measure the mean proper motion of the two Magellanic Clouds. Appropriately-selected LMC populations show a proper motion <µα,µδ≥~(+0.84,+4.32) that is significantly higher, in <µδ>, than currently accepted Hipparcos-like values; <µα,µδ≥~(+1.94,-0.14). A higher <µα> value is also found for the SMC. Interestingly, the mean UCAC2 LMC proper motion agrees very well with the only work in the literature (Anguita et al., 2000AJ....120..845A) pointing to an unbound Magellanic Clouds-Milky Way interaction. Nonetheless, the implications of the UCAC2 proper motion are hard to reconcile with our present day understanding of the Clouds-Galaxy interaction unless one assumes a more massive Milky Way. Consequently, although no sources of systematic error have been identified, it is perhaps most likely that the UCAC2 catalog has an as yet unidentified systematic error resulting in an inconsistency between UCAC2 and Hipparcos based results for the Magellanic Clouds.

Abstract Copyright:

Journal keyword(s): astronomical data bases: miscellaneous - astrometry - galaxies: Magellanic Clouds - galaxies: interactions

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 779 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9141 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5410 1
4 NAME Magellanic Bridge HI 03 11 -77.5           ~ 307 1
5 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2917 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14392 1
7 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1657 2
8 NAME Local Group GrG ~ ~           ~ 6701 0

    Equat.    Gal    SGal    Ecl

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2019.12.16-03:49:11

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