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


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.12CEST16:26:19

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 - 2020
#notes
1 NGC 289 AGN 00 52 42.365 -31 12 20.99   11.36 13.44 10.38 11.4 ~ 202 0
2 UGC 2936 Sy2 04 02 48.255 +01 57 56.63   14.60 13.33 12.51 11.28 ~ 84 0
3 NGC 2770 GiG 09 09 33.622 +33 07 24.29   12.1       ~ 233 0
4 2MASS J10395248+2050493 LIN 10 39 52.477 +20 50 49.35   14.20       ~ 81 0
5 NGC 3642 LIN 11 22 18.014 +59 04 27.27   14.86 14.04     ~ 189 0
6 UGC 6614 LIN 11 39 14.8715231180 +17 08 37.195414914   14.8       ~ 125 0
7 NGC 4017 rG 11 58 45.626 +27 27 08.41   13.5       ~ 88 0
8 2MASX J12365934+1419494 LSB 12 36 59.3469733716 +14 19 49.158501218   17.80       ~ 173 0
9 2MASX J13031599+0128071 LSB 13 03 15.992 +01 28 07.15   15.5       ~ 25 0
10 NGC 5383 GiG 13 57 04.975 +41 50 46.60   12.5   10.95   ~ 312 0
11 NGC 5533 G 14 16 07.7447534360 +35 20 37.779634124   13.0       ~ 147 1
12 NGC 5905 H2G 15 15 23.324 +55 31 01.59   13.6       ~ 250 1
13 NGC 7589 Sy1 23 18 15.6787076663 +00 15 40.266258808   15.01 17.01     ~ 71 3

    Equat.    Gal    SGal    Ecl

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2020.08.12-16:26:19

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