SIMBAD references

1998ApJ...506..205E - Astrophys. J., 506, 205-221 (1998/October-2)

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.

EVANS A.S., SANDERS D.B., CUTRI R.M., RADFORD S.J.E., SURACE J.A., SOLOMON P.M., DOWNES D. and KRAMER C.

Abstract (from CDS):

Rest-frame 0.48-1.1 µm emission-line strengths and molecular gas mass (H2) 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] λ5007/Hβ, [S II] λλ6716, 6731/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. The upper limits of molecular gas mass for all three sources are M(H2) < (1-3)x1010 h–2 M (q0 = 0.5, H0 = 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 Lir/L'CO∼1300-2000 and thus are the extragalactic sources with the most extreme Lir/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., Md ∼ 105-107 h–2 M, Td = 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%.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: ISM - Infrared: Galaxies - ISM: Molecules - Radio Lines: Galaxies

Simbad objects: 14

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