2019A&A...631A..50M


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.18CEST08:47:24

2019A&A...631A..50M - Astronomy and Astrophysics, volume 631A, 50-50 (2019/11-1)

HALOGAS: the properties of extraplanar HI in disc galaxies.

MARASCO A., FRATERNALI F., HEALD G., DE BLOK W.J.G., OOSTERLOO T., KAMPHUIS P., JOZSA G.I.G., VARGAS C.J., WINKEL B., WALTERBOS R.A.M., DETTMAR R.J. and JUTTE E.

Abstract (from CDS):

We present a systematic study of the extraplanar gas (EPG) in a sample of 15 nearby late-type galaxies at intermediate inclinations using publicly available, deep interferometric HI data from the Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) survey. For each system we masked the HI emission coming from the regularly rotating disc and used synthetic datacubes to model the leftover "anomalous" HI flux. Our model consists of a smooth, axisymmetric thick component described by three structural and four kinematical parameters, which are fit to the data via a Markov chain Monte Carlo (MCMC) based Bayesian method. We find that extraplanar HI is nearly ubiquitous in disc galaxies as we fail to detect it in only two of the systems with the poorest spatial resolution. The EPG component encloses ∼5-25% of the total HI mass with a mean value of 14%, and has a typical thickness of a few kpc which is incompatible with expectations based on hydrostatic equilibrium models. The EPG kinematics is remarkably similar throughout the sample, and consists of a lagging rotation with typical vertical gradients of ~-10km/s/kpc, a velocity dispersion of 15-30km/s, and, for most galaxies, a global inflow in both the vertical and radial directions with speeds of 20-30km/s. The EPG HI masses are in excellent agreement with predictions from simple models of the galactic fountain that are powered by stellar feedback. The combined effect of photo-ionisation and interaction of the fountain material with the circumgalactic medium can qualitatively explain the kinematics of the EPG, but dynamical models of the galactic fountain are required to fully test this framework.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: halos - galaxies: ISM - galaxies: evolution - ISM: structure - ISM: kinematics and dynamics

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 1727 GiP 01 47 29.890 +27 20 00.06   12.54 11.98 11.77   ~ 176 0
2 NGC 672 GiP 01 47 54.4762706495 +27 25 57.994773107 12.04 11.60 11.09 10.81   ~ 253 0
3 UGC 1807 G 02 21 13.40 +42 45 45.7   11.26   14.38   ~ 36 0
4 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1531 2
5 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 697 1
6 NGC 949 GiG 02 30 48.650 +37 08 12.46   12.667 11.975 11.490 10.790 ~ 139 0
7 NGC 1003 GiG 02 39 16.893 +40 52 20.25   12.1   10.83   ~ 162 0
8 UGCA 105 GiG 05 14 15.3240822656 +62 34 47.963432681   15.3       ~ 74 1
9 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1616 1
10 NGC 2541 GiG 08 14 40.1104536348 +49 03 42.058472450 12.03 12.26 11.80     ~ 279 1
11 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 821 1
12 NGC 4062 EmG 12 04 03.8088012817 +31 53 44.492255334   11.90 11.21 10.62 10.03 ~ 239 0
13 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2126 3
14 NGC 4274 LIN 12 19 50.665 +29 36 52.92 11.78 11.34 10.41     ~ 226 1
15 NGC 4275 GiC 12 19 52.602 +27 37 15.20   13.4       ~ 46 0
16 NGC 4414 GiG 12 26 27.089 +31 13 24.76 11.12 10.96 10.12     ~ 516 2
17 NGC 4448 H2G 12 28 15.428 +28 37 13.08   11.9       ~ 174 0
18 NGC 4559 H2G 12 35 57.6399424117 +27 57 35.859639262   10.46 10.01     ~ 536 1
19 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1065 2
20 NGC 5585 GiG 14 19 48.204 +56 43 44.58   11.73 11.216 11.12 10.123 ~ 383 0
21 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2248 2

    Equat.    Gal    SGal    Ecl

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2020.09.18-08:47:24

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