Evidence of enhanced star formation efficiency in luminous and ultraluminous infrared galaxies
نویسندگان
چکیده
منابع مشابه
Evidence of enhanced star formation efficiency in luminous and ultraluminous infrared galaxies
We present new observations made with the IRAM 30 m telescope of the J = 1−0 and 3–2 lines of HCN and HCO used to probe the dense molecular gas content in a sample of 17 local luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs). These observations have allowed us to derive an updated version of the power law describing the correlation between the FIR luminosity (LFIR) and the HCN(1−...
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We present HST/NICMOS observations of a sample of LIRGs. We show that active star formation appears to be occurring not only in the bright nuclei of these galaxies, but also in luminous super-star clusters and giant H ii regions with ages of up to 20− 40Myr. This population of bright clusters and H ii regions is unprecedented in normal galaxies and emphasizes the effects of the extreme star for...
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HST NICMOS observations of a sample of 24 luminous (LIGs: LIR[8− 1000μm] = 10L⊙) and ultraluminous (ULIGs: LIR ∼10 L⊙) infrared galaxies are presented. The observations provide, for the first time, high resolution HST imaging of the imbedded 1.1 2.2 μm nuclear regions of these mergers. All but one of the ULIGs are observed to have at least one compact (50-200 pc) nucleus, and more than half con...
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Among star forming galaxies, a spectral combination of a strong Hδ line in absorption and a moderate [Oii] emission has been suggested to be a useful method to identify dusty starburst galaxies at any redshift, on the basis of optical data alone. On one side it has been shown that such a spectral particularity is indeed suggestive of obscured starburst galaxies but, on the other, the degeneracy...
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The energy input into the interstellar medium in Ultraluminous Infrared Galaxies (ULIRGs) is enormous, regardless of the nature of the power source. I discuss some of the major consequences for the structure and energetics of the ISM in these galaxies. Observationally, the column densities in the nuclear regions of ULIRGs are known to be very high, which makes distinguishing starbursts from AGN...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20078223