2003A&A...408..493B


Query : 2003A&A...408..493B

2003A&A...408..493B - Astronomy and Astrophysics, volume 408, 493-498 (2003/9-3)

Cold dust and its relation to molecular gas in the dwarf irregular galaxy NGC 4449.

BOETTNER C., KLEIN U. and HEITHAUSEN A.

Abstract (from CDS):

We present observations of the dwarf irregular galaxy NGC 4449 at 850µm and 450µm obtained with SCUBA at the JCMT. The distribution of the cold dust agrees well with that of the CO and Hα emission. To explain the integrated mm- through far-infrared continuum spectrum three dust components are required, with temperatures of 16K, 39K and 168K, respectively. The dust mass is dominated by the cold dust component; we derive a total dust mass of ∼3.8x106M, and with the local gas-to-dust ratio of ∼130 a total gas mass of MHI+H2∼4.9x108M. Comparison with the HI mass leads to a total molecular gas mass of ∼3.4x108M. We derive a conversion factor of the CO line intensity to molecular hydrogen column density XCO=NH2/ICO which is at least 11 times larger than the Galactic value. These values are in accord with the lower metallicity of NGC 4449.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4449 - galaxies: ISM - galaxies: irregular - ISM: dust, extinction

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1198 3
2 UGC 7577 GiG 12 27 41.8796163840 +43 29 58.136511408 13.75 13.10 12.7 12.33   ~ 242 0
3 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1076 1

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2022.08.18-04:05:06

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