2001A&A...375..797W


Query : 2001A&A...375..797W

2001A&A...375..797W - Astronomy and Astrophysics, volume 375, 797-804 (2001/9-1)

Molecular gas and dust in NGC4550. A galaxy with two counterrotating stellar disks.

WIKLIND T. and HENKEL C.

Abstract (from CDS):

We report the detection of 1x107M of molecular gas in the central region of the S0/E7 galaxy NGC 4550, inferred from observations of CO(1-0) emission. Dust is detected in HST WFPC2 images and found to be asymmetrically distributed around the nucleus, only extending to a galactocentric distance of 7'' (600pc). The shape of the CO emission profile is consistent with a molecular gas distribution following the dust. The distribution of the dust and gas in the center could be the result of an m=1 instability, which is the fastest growing unstable mode in counterrotating stellar disks. On a global scale the molecular gas in NGC 4550 is stable against gravitational collapse but nevertheless star formation appears to be ongoing with normal star formation efficiency and gas consumption time scales. The stellar velocity dispersion in NGC 4550 resembles that of elliptical galaxies. It is therefore likely that a hot X-ray emitting plasma limits the lifetime of the molecular gas, that must arise from a recent (≪1Gyr) accretion event.

Abstract Copyright:

Journal keyword(s): ISM: dust, extinction - ISM: molecules - galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 4550 - galaxies: structure

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 3593 GiG 11 14 36.9733686308 +12 49 05.505076217   11.8       ~ 332 2
2 NGC 4138 Sy1 12 09 29.788 +43 41 07.14 12.46 12.29 11.32 10.82   ~ 368 1
3 NGC 4550 GiP 12 35 30.612 +12 13 15.44 12.97 12.56 11.68     ~ 512 1
4 NGC 4551 GiP 12 35 37.980 +12 15 50.44 13.49 12.97 12.02     ~ 337 1
5 NGC 7217 LIN 22 07 52.368 +31 21 33.32   12.94 11.92     ~ 469 0
6 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1143 2

    Equat.    Gal    SGal    Ecl

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2021.07.29-22:36:47

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