2008A&A...490..555B


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST06:46:44

2008A&A...490..555B - Astronomy and Astrophysics, volume 490, 555-570 (2008/11-1)

HI holes and high-velocity clouds in the spiral galaxy NGC6946.

BOOMSMA R., OOSTERLOO T.A., FRATERNALI F., VAN DER HULST J.M. and SANCISI R.

Abstract (from CDS):

We present a study of the distribution and kinematics of the neutral gas in the low-inclination Scd galaxy NGC6946. The galaxy has been observed for 192h at 21-cm with the Westerbork Synthesis Radio Telescope. These are among the deepest observations ever obtained for a nearby galaxy. We detect widespread high-velocity HI (up to about 100km/s) and find 121 HI holes, most of which are located in the inner regions where the gas density and the star formation rate are higher. Much of the high-velocity gas appears to be related to star formation and to be, in some cases, associated with HI holes. The overall kinematics of the high-velocity gas is characterized by a slower rotation as compared with the regular disk rotation. We conclude that the high-velocity gas in NGC6946 is extra-planar and has the same properties as the gaseous halos observed in other spiral galaxies including the Milky Way. Stellar feedback (galactic fountain) is probably at the origin of most of the high-velocity gas and of the HI holes. There are also indications, especially in the outer regions, - an extended HI plume, velocity anomalies, sharp edges, and large-scale asymmmetries - pointing to tidal encounters and recent gas accretion.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 6946 - galaxies: ISM - galaxies: halos - galaxies: structure

Nomenclature: Fig.7: [BOF2008] NNN (Nos 1-121).

Simbad objects: 21

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Number of rows : 21

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 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1009 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10949 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9478 1
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5148 1
5 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1408 1
6 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2507 2
7 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1526 2
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14874 1
9 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1269 1
10 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1612 1
11 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 691 2
12 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3972 5
13 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 605 1
14 NGC 4559 H2G 12 35 57.6399424117 +27 57 35.859639262   10.46 10.01     ~ 533 1
15 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3794 4
16 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3736 1
17 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2552 2
18 LDN 149 DNe 17 27.0 -20 53           ~ 5 0
19 UGC 11583 LSB 20 30 15.39 +60 26 25.2   17       ~ 56 0
20 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2242 2
21 NAME Local Group GrG ~ ~           ~ 7000 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-06:46:44

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