COLD DUST BUT WARM GAS IN THE UNUSUAL ELLIPTICAL GALAXY NGC 4125

Data from the Herschel Space Observatory have revealed an unusual elliptical galaxy, NGC 4125, which has strong and extended submillimeter emission from cold dust but only very strict upper limits to its CO and H I emission. Depending on the dust emissivity, the total dust mass is 2-5 x 10 super(6)...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2013-10, Vol.776 (2), p.1-5
Main Authors: Wilson, C D, Cridland, A, Foyle, K, Parkin, T J, COOPER, E MENTUCH, Roussel, H, Sauvage, M, Smith, M W L, Baes, M, Bendo, G
Format: Article
Language:English
Subjects:
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CARBON MONOXIDE
COSMIC DUST
Dust
Elliptical galaxies
EMISSION
Emissions control
EMISSIVITY
Evaporation
EVOLUTION
GALAXIES
Interstellar matter
MASS
Mass ratios
RED SHIFT
Sciences of the Universe
STARS
VISIBLE RADIATION
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Summary:Data from the Herschel Space Observatory have revealed an unusual elliptical galaxy, NGC 4125, which has strong and extended submillimeter emission from cold dust but only very strict upper limits to its CO and H I emission. Depending on the dust emissivity, the total dust mass is 2-5 x 10 super(6) M sub([middot in circle]). While the neutral gas-to-dust mass ratio is extremely low (< 12-30), including the ionized gas traced by [CII] emission raises this limit to or =, slant]10 super(4) K faster than the dust is evaporated. If galaxies like NGC 4125, where the far-infrared emission does not trace neutral gas in the usual manner, are common at higher redshift, this could have significant implications for our understanding of high redshift galaxies and galaxy evolution.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/776/2/L30