GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469-猫眼课题宝

DOI：

10.3847/2041-8213/acac66

发表时间：

2022-09

期刊：

The Astrophysical Journal Letters

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

L. Armus;T. Lai;U. V.;K. Larson;T. Díaz-Santos;A. Evans;M. Malkan;J. Rich;A. Medling;D. Law;H. Inami;F. Muller-Sanchez;V. Charmandaris;P. Werf;S. Stierwalt;S. Linden;G. Privon;L. Barcos-Muñoz;C. Hayward;Y. Song;P. Appleton;S. Aalto;T. Bøhn;T. Boker;M.J.I. Brown;L. Finnerty;J. Howell;K. Iwasawa;F. Kemper;J. Marshall;J. Mazzarella;J. McKinney;E. Murphy;D. Sanders;J. Surace

作为1328年董事自由支配时间提前释放科学计划的一部分，我们展示了詹姆斯韦伯太空望远镜（JWST）上的MIRI仪器对附近的Seyfert星系NGC 7469核的中红外光谱观测。高分辨率的核光谱包含19条辐射线，覆盖了很宽的电离范围。高电离谱线显示出宽的蓝移发射，速度可达1700 km s - 1， FWHM范围为~ 500 ~ 1100 km s - 1。宽发射的宽度和宽窄线通量比与电离势有关。结果表明，从核中出现的agn驱动的减速，分层的流出。估计的质量流出率比目前为AGN提供动力所需的黑洞吸积率大1-2个数量级。探测到8条纯旋转H2发射线，其本征宽度从FWHM ~ 125到330 km s−1。我们估计在中央100pc的热H2气体的总质量为~ 1.2 × 107 M⊙。多环芳烃特征在核光谱中非常微弱，但检测到6.2 μm的多环芳烃特征，其等效宽度为~ 0.07 μm，通量为2.7 × 10−17 W m−2。光谱在中红外波段急剧上升，硅酸盐强度为~ 0.02，明显小于大多数PG qso，但与其他Seyfert 1s相当。这些早期的MIRI中红外IFU数据突出了JWST探测活跃吸积超大质量黑洞周围多相星际介质的能力。

We present mid-infrared spectroscopic observations of the nucleus of the nearby Seyfert galaxy NGC 7469 taken with the MIRI instrument on the James Webb Space Telescope (JWST) as part of Directors Discretionary Time Early Release Science program 1328. The high-resolution nuclear spectrum contains 19 emission lines covering a wide range of ionization. The high-ionization lines show broad, blueshifted emission reaching velocities up to 1700 km s−1 and FWHM ranging from ∼500 to 1100 km s−1. The width of the broad emission and the broad-to-narrow line flux ratios correlate with ionization potential. The results suggest a decelerating, stratified, AGN-driven outflow emerging from the nucleus. The estimated mass outflow rate is 1–2 orders of magnitude larger than the current black hole accretion rate needed to power the AGN. Eight pure rotational H2 emission lines are detected with intrinsic widths ranging from FWHM ∼125 to 330 km s−1. We estimate a total mass of warm H2 gas of ∼1.2 × 107 M ⊙ in the central 100 pc. The PAH features are extremely weak in the nuclear spectrum, but a 6.2 μm PAH feature with an equivalent width of ∼0.07 μm and a flux of 2.7 × 10−17 W m−2 is detected. The spectrum is steeply rising in the mid-infrared, with a silicate strength of ∼0.02, significantly smaller than seen in most PG QSOs but comparable to other Seyfert 1s. These early MIRI mid-infrared IFU data highlight the power of JWST to probe the multiphase interstellar media surrounding actively accreting supermassive black holes.

GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469

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