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Title:
Near Infrared Spectroscopy and the Search for CO Emission in 3 Extremely Luminous IRAS Sources
Authors:
Evans, A. S.; Sanders, D. B.; Cutri, R. M.; Radford, S. J. E.; Solomon, P. M.; Downes, D.; Kramer, C.
Affiliation:
AA(Caltech, Pasadena, USA, ), AB(IfA, Hawaii, USA, ), AC(IPAC-Caltech, Pasadena, USA, ), AD(NRAO, Tucson, USA, ), AE(SUNY, Stony Brook, USA, ), AF(IRAM, Grenoble, France, ), AG(IRAM, Granada, Spain, )
Publication:
Galaxy Interactions at Low and High Redshift, Proceedings of IAU Symposium #186, held at Kyoto, Japan, 26-30 August, 1997. Edited by J. E. Barnes, and D. B. Sanders, 1999., p.354
Publication Date:
00/1999
Origin:
AUTHOR
Bibliographic Code:
1999IAUS..186..354E

Abstract

Rest-frame 0.48--1.1 micron emission line strengths and molecular gas mass (H2) upper limits for the hyperluminous infrared galaxies (HyLIGs: Lir > = 1013 Lodot) IRAS F09104+4109 (z = 0.4417), IRAS F15307+3252 (z = 0.926), and the QSO PG 1634+706 (z = 1.338) -- are presented. Diagnostic emission-line ratios ([O III] lambda 5007/H beta, [S II] lambda 6724/H alpha, [N II] lambda 6583/H alpha, and [S III] lambda lambda 9069+9532/H alpha) 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(H2) < 1-3 times 1010 h-2 Modot (q0 = 0.5, H0 = 100h km/s-1 Mpc-1), less than the H2 mass of the most gas-rich infrared galaxies in the local Universe. All three sources have LIR / L'CO ~1300-2000, the most extreme values for extragalactic 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 the AGN.

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