The Kennicutt–Schmidt Law and Gas Scale Height in Luminous and Ultraluminous Infrared Galaxies

Many ultraluminous infrared galaxies (ULIRGs) are powered by quasars hidden in the center, but many are also powered by starbursts. A simply diagnostic diagram is proposed that can identify obscured quasars in ULIRGs by their high-ionization emission lines ([O III]λ5007/Hβ ≳ 5), and “warm” IR color (f25/f60≳ 0.25).

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Ultraluminous Infrared Galaxies

Symposium - International Astronomical Union ◽

10.1017/s0074180900112859 ◽

1999 ◽

Vol 186 ◽

pp. 289-294 ◽

Cited By ~ 1

Author(s):

D.B. Sanders ◽

J.A. Surace ◽

C.M. Ishida

Keyword(s):

Globular Clusters ◽

Elliptical Galaxy ◽

Seyfert Galaxies ◽

Infrared Galaxies ◽

Primary Stage ◽

Massive Black Holes ◽

Bolometric Luminosity ◽

Ultraluminous Infrared Galaxies ◽

Supernova Explosions ◽

Galaxy Cores

At luminosities above ~ 1011L⊙, infrared galaxies become the dominant population of extragalactic objects in the local Universe (z < 0.5), being more numerous than optically selected starburst and Seyfert galaxies, and QSOs at comparable bolometric luminosity. At the highest luminosities, ultraluminous infrared galaxies (ULIGs: Lir > 1012L⊙), outnumber optically selected QSOs by a factor of ~ 1.5–2. All of the nearest ULIGs (z <0.1) appear to be advanced mergers that are powered by both a circumnuclear starburst and AGN, both of which are fueled by an enormous concentration of molecular gas (~ 1010M⊙) that has been funneled into the merger nucleus. ULIGs may represent a primary stage in the formation of massive black holes and elliptical galaxy cores. The intense circumnuclear starburst that accompanies the ULIG phase may also represent a primary stage in the formation of globular clusters, and the metal enrichment of the intergalactic medium by gas and dust expelled from the nucleus due to the combined forces of supernova explosions and powerful stellar winds.

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Atomic Hydrogen Gas Images of QSO Host Galaxies

Symposium - International Astronomical Union ◽

10.1017/s007418090016869x ◽

2002 ◽

Vol 199 ◽

pp. 122-126

Author(s):

J. Lim ◽

P.T.P. Ho

Keyword(s):

Atomic Hydrogen ◽

Hydrogen Gas ◽

Significant Fraction ◽

Host Galaxies ◽

Infrared Galaxies ◽

Parent Population ◽

Tidal Interactions ◽

Ultraluminous Infrared Galaxies

We present the first neutral atomic hydrogen (HI) gas images of QSO host galaxies. The results come from our ongoing survey of all twenty-three QSOs at redshifts z < 0.07 visible from the VLA. Our images show tidal interactions in all of the QSO host galaxies detected in HI, even when no such interactions are clearly visible in the optical. The results are not consistent with the suggestion by Sanders et al. (1988a, 1988b) that ultraluminous infrared galaxies, the vast majority of which are later-stage mergers, are the parent population of a significant fraction of radio-quiet QSOs. Instead, our results suggest that QSOs reside in a wide variety of interacting environments.

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Structural and Morphological Properties of Ultraluminous Infrared Galaxies at 1 < z < 3

Open Astronomy ◽

10.1515/astro-2017-0224 ◽

2015 ◽

Vol 24 (3) ◽

Author(s):

Guanwen Fang ◽

Zhongyang Ma ◽

Yang Chen ◽

Xu Kong

Keyword(s):

High Resolution ◽

Near Infrared ◽

Hubble Space Telescope ◽

Morphological Properties ◽

Wide Field ◽

High Resolution Imaging ◽

Infrared Galaxies ◽

Morphology And Structure ◽

Ultraluminous Infrared Galaxies ◽

Resolution Imaging

AbstractUsing the Hubble Space Telescope (HST)/Wide Field Camera 3 (WFC3) near-infrared high-resolution imaging from the 3D-HST survey, we analyze the morphology and structure of 502 ultraluminous infrared galaxies (ULIRGs;

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