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Rest-frame 0.48-1.1 micron emission line strengths and molecular gas mass(H_2) upper limits for 3 luminous infrared sources - the hyperluminous infraredgalaxies IR F09105+4108 (z=0.44), IR F15307+3252 (z=0.93), and theoptically-selected QSO PG 1634+706 (z=1.3) - are presented. Diagnosticemission-line ratios indicate a Seyfert 2-like spectrum for both infraredgalaxies, consistent with previously published work. The upper limits ofmolecular gas mass for all 3 sources are M(H_2) < 1-3x10^10 h^-2 M_sun (q=0.5,H=100h km/s/Mpc), less than that of the most gas-rich infrared galaxies in thelocal Universe. All 3 sources have L_ir/L'_CO = 1300-2000, and thus are theextragalactic sources with the most extreme L_ir/L'_CO values measured to date.Given the relatively warm far-infrared colors for all 3 objects, much of theirinfrared luminosity may emanate from a relatively modest amount of warm dust(e.g. M_d = 10^5-7 M_sun, T_d = 200-100 K) near the AGN...Comment: LaTex, 40 pages with 9 postscript and 3 jpg figures, ApJ, in pres

astrophysical journal/the astrophysical journal

Near‐Infrared Spectroscopy and a Search for CO Emission in Three Extremely Luminous<i>IRAS</i>Sources: IRAS F09105+4108, IRAS F15307+3252, and PG 1634+706

Near‐Infrared Spectroscopy and a Search for CO Emission in Three Extremely LuminousIRASSources: IRAS F09105+4108, IRAS F15307+3252, and PG 1634+706