Infrared Spectroscopy of CO Ro-Vibrational Absorption Lines toward the Obscured AGN IRAS 08572+3915
Infrared Spectroscopy of CO Ro-Vibrational Absorption Lines toward the Obscured AGN IRAS 08572+3915
复制标题
朝向被遮挡的 AGN IRAS 的 CO Ro 振动吸收线的红外光谱分析 08572 3915
DOI:
10.1093/pasj/65.1.5
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发表时间:
2012
影响因子:
2.3
通讯作者:
T. Geballe
中科院分区:
文献类型:
--
作者:
M. Shirahata;M. Shirahata;T. Nakagawa;T. Usuda;M. Goto;H. Suto;T. Geballe
We present high-resolution spectroscopy of gaseous CO absorption in the fundamental ro-vibrational band toward the heavily obscured active galactic nucleus (AGN) IRAS 08572+3915. We have detected absorption lines up to highly excited rotational levels (J 5 17). The velocity profiles reveal three distinct components, the strongest and broadest (Δ v> 200 km s � 1 ) of which is due to blueshifted (� 160 km s � 1 ) gas at a temperature of� 270 K absorbing at velocities as high as� 400 km s � 1 . A much weaker but even warmer (� 700 K) component, which is highly redshifted (+100 km s � 1 ), is also detected, in addition to a cold (� 20 K) component centered at the systemic velocity of the galaxy. On the assumption of local thermodynamic equilibrium, the column density of CO in the 270 K component is NCO� 4.5� 10 18 cm � 2 , which in fully molecular gas corresponds to an H2 column density of NH2 � 2.5� 10 22 cm � 2 . The thermal excitation of CO up to the observed high rotational levels requires a density greater than nc(H2) > 2� 10 7 cm � 3 , implying that the thickness of the warm absorbing layer is extremely small (Δ d< 4� 10 � 2 pc), even if it is highly clumped. The large column densities and high radial velocities associated
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DOI:
--
发表时间:
2008
期刊:
PASJ 60
影响因子:
--
作者:
Imanishi;M.;Nakagawa;T.;Ohyama;Y.;Shirahata;M.;Wada;T.;Onaka;T.;Oi;N.
通讯作者:
N.
影响因子:
6.5
作者:
Vollmer B.;Davies R. I.;Gratier P.;Lizee Th.;Imanishi M.;Gallimore J. F.;Impellizzeri C. M. V.;Garcia-Burillo S.;Le Petit F.
通讯作者:
Le Petit F.
DOI:
--
发表时间:
2007
期刊:
Publications of the Astronomical Society of Japan 59(印刷中)
影响因子:
--
作者:
Wada;K.
通讯作者:
K.
DOI:
--
发表时间:
2006
期刊:
Astrophysical Journal 637
影响因子:
--
作者:
Imanishi;Dudley;Maloney
通讯作者:
Maloney
DOI:
--
发表时间:
2004
期刊:
The Astrophysical Journal 619
影响因子:
--
作者:
K.Wada;K.Tomisaka
通讯作者:
K.Tomisaka