2018MNRAS.479.2505K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST14:54:02

2018MNRAS.479.2505K - Mon. Not. R. Astron. Soc., 479, 2505-2533 (2018/September-2)

Kinematics of the atomic ISM in M33 on 80 pc scales.

KOCH E.W., ROSOLOWSKY E.W., LOCKMAN F.J., KEPLEY A.A., LEROY A., SCHRUBA A., BRAINE J., DALCANTON J., JOHNSON M.C. and STANIMIROVIC S.

Abstract (from CDS):

We present new L-band (1-2 GHz) observations of the nearby spiral galaxy M33 with 80 pc resolution obtained with the Karl G. Jansky Very Large Array. The H I observations, combined with H I measurements from the Green Bank Telescope, improve the spectral resolution and sensitivity (2.8 K rms noise in a 0.2 km s–1 channel) compared to previous observations. We find individual profiles are usually non-Gaussian, harbouring line wings, multiple components, and asymmetries. Given this spectral complexity, we quantify the motions in the atomic interstellar medium through moment analysis of the spectra and fits to aligned, stacked profiles. The measured value of the H I line width depends strongly on the method used, with the velocity stacked profiles aligned to the peak velocity giving the minimum value of σ = 7 km s–1 and all other methods giving higher values (σ ∼ 10 km s–1). All measurements of the line width show a shallow radial trend, with σ decreasing by ∼2 km s–1 from Rgal = 0 to Rgal = 8 kpc. We consider a number of energy sources that might maintain the line width against turbulent dissipation, but no single source is adequate. We find excess emission relative to a Gaussian in the stacked profile line wings, ranging from 9 per cent to 26 per cent depending on how the spectra are aligned. By splitting the line wings into symmetric and asymmetric components, we find that the lagging rotational disc accounts for one-third of the line wing flux. We also find emission far from the rotation-axis of the galaxy in multiple discrete H I clouds, including a filament with a projected length of ∼8 kpc.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): ISM: kinematics and dynamics - galaxies: individual: M33 - galaxies: ISM - radio lines: ISM

Errata: erratum vol. 480, p. 3193 (2018)

Simbad objects: 14

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Number of rows : 14

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
2 NAME M31 Group GrG 00 47 28.6 +40 17 23           ~ 56 0
3 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
4 NGC 604 HII 01 34 32.1 +30 47 01           ~ 544 0
5 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1401 1
6 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2497 2
7 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1521 2
8 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 694 1
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
10 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 746 1
11 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1608 1
12 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 581 1
13 NGC 4559 H2G 12 35 57.6399424117 +27 57 35.859639262   10.46 10.01     ~ 533 1
14 NAME Local Group GrG ~ ~           ~ 6973 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-14:54:02

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