A kinematical study of the giant H II regions in NGC 4449

Oriol Fuentes-Masip; Casiana Muñoz-Tuñon; Héctor O. Castañeda; Guillermo Tenorio-Tagle

A kinematical study of the giant H II regions in NGC 4449

Oriol Fuentes-Masip, Casiana Muñoz-Tuñon, Héctor O. Castañeda, Guillermo Tenorio-Tagle

Research output: Contribution to journal › Conference article › peer-review

Abstract

We present the results of a kinematical study of the H II regions in the central area of the giant irregular galaxy NGC 4449. A new method is defined to determine the sizes of the regions. We obtained the integrated parameters of the H II regions: radius, luminosity, radial velocity and velocity dispersion. We define the size and luminosity vs. velocity dispersion empirical correlations for the giant H II regions in the galaxy, and show that the correlations only hold for nebulae with surface brightness higher than 2 × 10³⁵ erg s^-1 pc^-2 in Hα and with a supersonic single line Gaussian profile. The exponent of the fits are consistent with virial mechanisms.

Original language	English
Pages (from-to)	34-37
Number of pages	4
Journal	Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias
Volume	10
State	Published - 2001
Externally published	Yes
Event	7th Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows - Austin, TX, United States Duration: 6 Apr 2000 → 8 Apr 2000

Keywords

Galaxies: irregulars
Hydrodynamics
ISM: H II regions
ISM: kinematics and dynamics

Cite this

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title = "A kinematical study of the giant H II regions in NGC 4449",

abstract = "We present the results of a kinematical study of the H II regions in the central area of the giant irregular galaxy NGC 4449. A new method is defined to determine the sizes of the regions. We obtained the integrated parameters of the H II regions: radius, luminosity, radial velocity and velocity dispersion. We define the size and luminosity vs. velocity dispersion empirical correlations for the giant H II regions in the galaxy, and show that the correlations only hold for nebulae with surface brightness higher than 2 × 1035 erg s-1 pc-2 in Hα and with a supersonic single line Gaussian profile. The exponent of the fits are consistent with virial mechanisms.",

keywords = "Galaxies: irregulars, Hydrodynamics, ISM: H II regions, ISM: kinematics and dynamics",

author = "Oriol Fuentes-Masip and Casiana Mu{\~n}oz-Tu{\~n}on and Casta{\~n}eda, {H{\'e}ctor O.} and Guillermo Tenorio-Tagle",

year = "2001",

language = "Ingl{\'e}s",

volume = "10",

pages = "34--37",

journal = "Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias",

issn = "1405-2059",

note = "7th Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows ; Conference date: 06-04-2000 Through 08-04-2000",

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TY - JOUR

T1 - A kinematical study of the giant H II regions in NGC 4449

AU - Fuentes-Masip, Oriol

AU - Muñoz-Tuñon, Casiana

AU - Castañeda, Héctor O.

AU - Tenorio-Tagle, Guillermo

PY - 2001

Y1 - 2001

N2 - We present the results of a kinematical study of the H II regions in the central area of the giant irregular galaxy NGC 4449. A new method is defined to determine the sizes of the regions. We obtained the integrated parameters of the H II regions: radius, luminosity, radial velocity and velocity dispersion. We define the size and luminosity vs. velocity dispersion empirical correlations for the giant H II regions in the galaxy, and show that the correlations only hold for nebulae with surface brightness higher than 2 × 1035 erg s-1 pc-2 in Hα and with a supersonic single line Gaussian profile. The exponent of the fits are consistent with virial mechanisms.

AB - We present the results of a kinematical study of the H II regions in the central area of the giant irregular galaxy NGC 4449. A new method is defined to determine the sizes of the regions. We obtained the integrated parameters of the H II regions: radius, luminosity, radial velocity and velocity dispersion. We define the size and luminosity vs. velocity dispersion empirical correlations for the giant H II regions in the galaxy, and show that the correlations only hold for nebulae with surface brightness higher than 2 × 1035 erg s-1 pc-2 in Hα and with a supersonic single line Gaussian profile. The exponent of the fits are consistent with virial mechanisms.

KW - Galaxies: irregulars

KW - Hydrodynamics

KW - ISM: H II regions

KW - ISM: kinematics and dynamics

UR - http://www.scopus.com/inward/record.url?scp=70649089229&partnerID=8YFLogxK

M3 - Artículo de la conferencia

AN - SCOPUS:70649089229

SN - 1405-2059

VL - 10

SP - 34

EP - 37

JO - Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias

JF - Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias

T2 - 7th Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows

Y2 - 6 April 2000 through 8 April 2000

ER -

A kinematical study of the giant H II regions in NGC 4449

Abstract

Keywords

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