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Title:
Near-Infrared Spectroscopy and a Search for CO Emission in Three Extremely Luminous IRAS Sources: IRAS F09105+4108, IRAS F15307+3252, and PG 1634+706
Authors:
Evans, A. S.; Sanders, D. B.; Cutri, R. M.; Radford, S. J. E.; Surace, J. A.; Solomon, P. M.; Downes, D.; Kramer, C.
Publication:
The Astrophysical Journal, Volume 506, Issue 1, pp. 205-221. (ApJ Homepage)
Publication Date:
10/1998
Origin:
APJ
ApJ Keywords:
GALAXIES: ACTIVE, GALAXIES: ISM, INFRARED: GALAXIES, ISM: MOLECULES, RADIO LINES: GALAXIES
DOI:
10.1086/306234
Bibliographic Code:
1998ApJ...506..205E

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 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] lambda5007/Hβ, [S II] lambdalambda6716, 6731/Hα, [N II] lambda6583/Hα, and [S III] lambdalambda9069, 9532/Hα) indicate a Seyfert 2-like spectrum for both infrared galaxies, consistent with previously published work. The upper limits of molecular gas mass for all three sources are M(H_2) < (1-3) x 10^10 h^-2 M_ȯ (q_0 = 0.5, H_0 = 100 h km s^-1 Mpc^-1), less than that of the most gas-rich infrared galaxies in the local universe. All three sources have L_ir/L^'_CO~1300-2000 and thus are the extragalactic sources with the most extreme L_ir/L^'_CO values measured to date. Given the relatively warm far-infrared colors for all three objects, much of their infrared luminosity may emanate from a relatively modest amount of warm dust (e.g., M_d ~ 10^5-10^7 h^-2 M_ȯ, T_d = 200-100 K) near the AGN. For F09105+4108 and F15307+3252, the implied circumnuclear covering factor of this dust is ~90%, while for PG 1634+706 the covering factor is only ~35%.
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