Extra-planar gas in the spiral galaxy NGC4559

CV Barbieri; F Fraternali; T Oosterloo; G Bertin; R Boomsma; R Sancisi

doi:10.1051/0004-6361:20042395

Extra-planar gas in the spiral galaxy NGC4559

CV Barbieri^*, F Fraternali, T Oosterloo, G Bertin, R Boomsma, R Sancisi

^*Corresponding author for this work

Astronomy

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Abstract

We present 21-cm line observations of the spiral galaxy NGC4559, made with the Westerbork Synthesis Radio Telescope. We have used them to study the HI distribution and kinematics, the relative amount and distribution of luminous and dark matter in this galaxy and, in particular, the presence of extra-planar gas. Our data do reveal the presence of such a component, in the form of a thick disk, with a mass of 5.9 x 10(8) M-circle dot (one tenth of the total HI mass) and a mean rotation velocity 25-50 km s(-1) lower than that of the thin disk. The extra-planar gas may be the result of galactic fountains but accretion from the IGM cannot be ruled out. With this study we confirm that lagging, thick HI layers are likely to be common in spiral galaxies.

Original language	English
Pages (from-to)	947-956.e7
Number of pages	17
Journal	Astronomy & Astrophysics
Volume	439
Issue number	3
DOIs	https://doi.org/10.1051/0004-6361:20042395
Publication status	Published - Sept-2005

Keywords

galaxies : halos
galaxies : individual : NGC4559
galaxies : ISM
galaxies : kinematics and dynamics
H-I
INTERSTELLAR-MEDIUM
HALO
NGC-4559
DISK

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@article{f49105b8c35644e6b0f281e16379ce06,

title = "Extra-planar gas in the spiral galaxy NGC4559",

abstract = "We present 21-cm line observations of the spiral galaxy NGC4559, made with the Westerbork Synthesis Radio Telescope. We have used them to study the HI distribution and kinematics, the relative amount and distribution of luminous and dark matter in this galaxy and, in particular, the presence of extra-planar gas. Our data do reveal the presence of such a component, in the form of a thick disk, with a mass of 5.9 x 10(8) M-circle dot (one tenth of the total HI mass) and a mean rotation velocity 25-50 km s(-1) lower than that of the thin disk. The extra-planar gas may be the result of galactic fountains but accretion from the IGM cannot be ruled out. With this study we confirm that lagging, thick HI layers are likely to be common in spiral galaxies.",

keywords = "galaxies : halos, galaxies : individual : NGC4559, galaxies : ISM, galaxies : kinematics and dynamics, H-I, INTERSTELLAR-MEDIUM, HALO, NGC-4559, DISK",

author = "CV Barbieri and F Fraternali and T Oosterloo and G Bertin and R Boomsma and R Sancisi",

year = "2005",

month = sep,

doi = "10.1051/0004-6361:20042395",

language = "English",

volume = "439",

pages = "947--956.e7",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = " EDP Sciences",

number = "3",

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TY - JOUR

T1 - Extra-planar gas in the spiral galaxy NGC4559

AU - Barbieri, CV

AU - Fraternali, F

AU - Oosterloo, T

AU - Bertin, G

AU - Boomsma, R

AU - Sancisi, R

PY - 2005/9

Y1 - 2005/9

N2 - We present 21-cm line observations of the spiral galaxy NGC4559, made with the Westerbork Synthesis Radio Telescope. We have used them to study the HI distribution and kinematics, the relative amount and distribution of luminous and dark matter in this galaxy and, in particular, the presence of extra-planar gas. Our data do reveal the presence of such a component, in the form of a thick disk, with a mass of 5.9 x 10(8) M-circle dot (one tenth of the total HI mass) and a mean rotation velocity 25-50 km s(-1) lower than that of the thin disk. The extra-planar gas may be the result of galactic fountains but accretion from the IGM cannot be ruled out. With this study we confirm that lagging, thick HI layers are likely to be common in spiral galaxies.

AB - We present 21-cm line observations of the spiral galaxy NGC4559, made with the Westerbork Synthesis Radio Telescope. We have used them to study the HI distribution and kinematics, the relative amount and distribution of luminous and dark matter in this galaxy and, in particular, the presence of extra-planar gas. Our data do reveal the presence of such a component, in the form of a thick disk, with a mass of 5.9 x 10(8) M-circle dot (one tenth of the total HI mass) and a mean rotation velocity 25-50 km s(-1) lower than that of the thin disk. The extra-planar gas may be the result of galactic fountains but accretion from the IGM cannot be ruled out. With this study we confirm that lagging, thick HI layers are likely to be common in spiral galaxies.

KW - galaxies : halos

KW - galaxies : individual : NGC4559

KW - galaxies : ISM

KW - galaxies : kinematics and dynamics

KW - H-I

KW - INTERSTELLAR-MEDIUM

KW - HALO

KW - NGC-4559

KW - DISK

U2 - 10.1051/0004-6361:20042395

DO - 10.1051/0004-6361:20042395

M3 - Article

SN - 0004-6361

VL - 439

SP - 947-956.e7

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

IS - 3

ER -

Extra-planar gas in the spiral galaxy NGC4559

Abstract

Keywords

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