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Published 1999 | public
Book Section - Chapter

Near Infrared Spectroscopy And The Search For CO Emission In 3 Extremely Luminous IRAS Sources

Abstract

Rest-frame 0.48-1.1 μm emission line strengths and molecular gas mass (H_2) upper limits for three luminous infrared sources — the hyperluminous infrared galaxies (HyLIGs: L_(ir) ≥ 10^(13) L_⨀ where L_(ir) ∼ L(8 – 1000μm) IRAS F09105+4108 (z = 0.4417), IRAS F15307+3252 (z = 0.926), and the optically-selected QSO PG 1634+706 (z = 1.338) — are presented. Diagnostic emission-line ratios ([O III] λ5007/Hß, [S II] λ6724/Hα, [N II] λ6583/Hα, and [S III] λλ9069+9532/Hα) indicate a Seyfert 2-like spectrum for both infrared galaxies, consistent with previously published work. Upper limits on the molecular gas mass for all three sources are M(H_2) < 1 – 3 x 10^(10) h^(-2) M_⨀ (q_0 = 0.5, H_0 = 100h km s^(-1) Mpc^(-1)), less than the H_2 mass of the most gas-rich infrared galaxies in the local Universe. All three sources have L_(ir)/L′_(CO) ∼ 1300 – 2000, the most extreme values for extra-galactic sources measured to date. Given the relatively warm far-infrared colors for all three objects, much of their infrared luminosity may emanate from a relatively small quantity of hot dust near an AGN.

Additional Information

© 1999 Springer Science+Business Media Dordrecht.

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Created:
August 22, 2023
Modified:
January 14, 2024