2010A&A...516A..11L


Query : 2010A&A...516A..11L

2010A&A...516A..11L - Astronomy and Astrophysics, volume 516, A11-11 (2010/6-2)

Structure and dynamics of giant low surface brightness galaxies.

LELLI F., FRATERNALI F. and SANCISI R.

Abstract (from CDS):

Giant low surface brightness (GLSB) galaxies are commonly thought to be massive, dark matter dominated systems. However, this conclusion is based on highly uncertain rotation curves. We present here a new study of two prototypical GLSB galaxies: Malin 1 and NGC 7589. We re-analysed existing HI observations and derived new rotation curves, which were used to investigate the distributions of luminous and dark matter in these galaxies. In contrast to previous findings, the rotation curves of both galaxies show a steep rise in the central parts, typical of high surface brightness (HSB) systems. Mass decompositions with a dark matter halo show that baryons may dominate the dynamics of the inner regions. Indeed, a ``maximum disk'' fit gives stellar mass-to-light ratios in the range of values typically found for HSB galaxies. These results, together with other recent studies, suggest that GLSB galaxies are systems with a double structure: an inner HSB early-type spiral galaxy and an outer extended LSB disk. We also tested the predictions of MOND: the rotation curve of NGC 7589 is reproduced well, whereas Malin 1 represents a challenging test for the theory.

Abstract Copyright:

Journal keyword(s): dark matter - galaxies: structure - galaxies: kinematics and dynamics - galaxies: individual: Malin 1 - galaxies: individual: NGC 7589 - methods: data analysis

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 289 AGN 00 52 42.365 -31 12 20.99   11.36 13.44 10.38 11.4 ~ 225 0
2 NAME OKM2018 SWIFT J0402.9+0197 Sy2 04 02 48.255 +01 57 56.63   14.60 13.33 12.51 11.28 ~ 92 0
3 NGC 2770 GiG 09 09 33.622 +33 07 24.29   12.1       ~ 249 0
4 2MASS J10395248+2050493 LIN 10 39 52.4820927048 +20 50 49.375560660   14.20       ~ 89 0
5 NGC 3642 LIN 11 22 17.9010437568 +59 04 28.275641436   14.86 14.04     ~ 198 0
6 UGC 6614 LIN 11 39 14.8736598984 +17 08 37.200948684   14.8       ~ 138 0
7 NGC 4017 rG 11 58 45.6669574320 +27 27 08.585419680   13.5       ~ 95 0
8 2MASX J12365934+1419494 LSB 12 36 59.3463193464 +14 19 49.164305988   17.80       ~ 193 0
9 2dFGRS TGN394Z034 LSB 13 03 15.9953585376 +01 28 07.135042800   15.673   14.777   ~ 28 0
10 NGC 5383 GiG 13 57 04.9709727768 +41 50 46.419238680   12.5   10.95   ~ 330 0
11 NGC 5533 Sy2 14 16 07.7507477232 +35 20 37.879981584   13.0       ~ 163 1
12 NGC 5905 H2G 15 15 23.3280793632 +55 31 01.926808032   13.6       ~ 263 1
13 NGC 7589 Sy1 23 18 15.6790109856 +00 15 40.267016028   15.01 17.01     ~ 82 3

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2023.02.07-15:49:21

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