2021A&A...655A..64M


Query : 2021A&A...655A..64M

2021A&A...655A..64M - Astronomy and Astrophysics, volume 655A, 64-64 (2021/11-1)

Bayesian inference of three-dimensional gas maps. I. Galactic CO.

MERTSCH P. and VITTINO A.

Abstract (from CDS):

Carbon monoxide (CO) is the best tracer of Galactic molecular hydrogen (H2). Its lowest rotational emission lines are in the radio regime, and thanks to Galactic rotation, emission at different distances is Doppler shifted. For a given gas flow model, the observed spectra can thus be deprojected along the line of sight to infer the gas distribution. We used the CO-line survey of Dame et al. (2001ApJ...547..792D) to reconstruct the three-dimensional density of H2. We considered the deprojection as a Bayesian variational inference problem. The posterior distribution of the gas densities allowed us to estimate the mean and uncertainty of the reconstructed density. Unlike most of the previous attempts, we took the correlations of gas on a variety of scales into account, which allowed us to correct for some of the well-known pathologies, such as finger-of-god effects. The two gas flow models that we adopted incorporate a Galactic bar that induces radial motions in the inner few kiloparsecs and thus offers spectral resolution towards the Galactic centre. We compared our gas maps with those of earlier studies and characterise their statistical properties, for instance the radial profile of the average surface mass density.

Abstract Copyright: © ESO 2021

Journal keyword(s): Galaxy: structure - ISM: kinematics and dynamics - ISM: molecules - methods: statistical

VizieR on-line data: <Available at CDS (J/A+A/655/A64): list.dat fits/*>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Per Arm PoG 03 30 +45.0           ~ 1528 0
2 NGC 3504 LIN 11 03 11.3 +27 58 21   13.48 12.93     ~ 527 2
3 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1855 2
4 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 902 1
5 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2599 2
6 NAME Nor Arm PoG 16 00 -50.0           ~ 437 0
7 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14643 0
8 NAME Galactic Bar reg ~ ~           ~ 1245 0

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