The Dense Molecular Gas and Nuclear Activity in the ULIRG IRAS 13120-5453
G. C. Privon, S. Aalto, N. Falstad, S. Muller, E. González-Alfonso, K. Sliwa, E. Treister, F. Costagliola, L. Armus, A. S. Evans, S. Garcia-Burillo, T. Izumi, K… 展开作者
G. C. Privon, S. Aalto, N. Falstad, S. Muller, E. González-Alfonso, K. Sliwa, E. Treister, F. Costagliola, L. Armus, A. S. Evans, S. Garcia-Burillo, T. Izumi, K. Sakamoto, P. van der Werf, J. K. Chu
备注:
accepted for publication in ApJ, 21 pages, 11 figures
We present new ALMA Band 7 ($\sim340$ GHz) observations of the dense gas tracers HCN, HCO$^+$, and CS in the local, single-nucleus, ultraluminous infrared galaxy IRAS 13120-5453. We find centrally enhanced HCN (4-3) emission, relative to HCO$^+$ (4-3), but do not find evidence for radiative pumping of HCN. Considering the size of the starburst (0.5 kpc) and the estimated supernovae rate of $\sim1.2$ yr$^{-1}$, the high HCN/HCO$^+$ ratio can be explained by an enhanced HCN abundance as a result of mechanical heating by the supernovae, though the active galactic nucleus and winds may also contribute additional mechanical heating. The starburst size implies a high $Σ_{IR}$ of $4.7\times10^{12}$ $L_{\odot}$ kpc$^{-2}$, slightly below predictions of radiation-pressure limited starbursts. The HCN line profile has low-level wings, which we tentatively interpret as evidence for outflowing dense molecular gas. However, the dense molecular outflow seen in the HCN line wings is unlikely to escape the galaxy and is destined to return to the nucleus and fuel future star formation. We also present modeling of Herschel observations of the H$_2$O lines and find a nuclear dust temperature of $\sim40$ K. IRAS 13120-5453 has a lower dust temperature and $Σ_{IR}$ than is inferred for the systems termed "compact obscured nuclei" (such as Arp 220 and Mrk 231). If IRAS 13120-5453 has undergone a compact obscured nucleus phase, we are likely witnessing it at a time when the feedback has already inflated the nuclear ISM and diluted star formation in the starburst/AGN core.
The link between galaxy merger, radio jet expansion and molecular outflow in the ULIRG IRAS 00183-7111
Cardiff University(卡迪夫大学);INAF, Arcetri Astrophysical Observatory(意大利国家天体物理研究所,阿切特里天文台);INAF - Istituto di Radioastronomia(意大利国家天体物理研究所,射电天文研究所);INAF–Astronomical Observatory of Capodimonte(意大利国家天体物理研究所,卡波迪蒙特天文台);Observatorio de Madrid, OAN-IGN(马德里天文台,西班牙国家地理研究所);Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB)(巴塞罗那大学宇宙科学研究所);ICREA(加泰罗尼亚高级研究学院);Cornell Center for Astrophysics and Planetary Science(康奈尔天体物理学与行星科学中心);Centro de Astrobiología (CAB), CSIC-INTA(天体生物学中心,西班牙国家航空航天技术研究所/西班牙国家科学研究委员会);Dipartimento di Fisica e Astronomia “Augusto Righi(博洛尼大学物理与天文学系);INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所,博洛尼天体物理与空间科学观测站);School of Natural Sciences, University of Tasmania(塔斯马尼亚大学自然科学学院)
The role of molecular gas in the nuclear regions of IRAS 00183-7111. ALMA and X-ray investigations of an ultraluminous infrared galaxy
我们提出了一个多频率的研究超亮红外星系(ULIRG)IRAS 00183-7111(z=0.327),从勺诊断图选择作为一个高度模糊的活动星系核(AGN)的候选人。使用ALMA循环0毫米和X射线观测;主要目的是验证CO示踪的分子气体在什么水平上可能对在X射线能量下观测到的遮蔽负责。理论和观测都表明,星系尺度的吸收可能在中等(即康普顿薄)柱密度的活动星系核遮蔽中发挥作用。我们从ALMA CO $_{(1-0)}$探测中推导出分子气体柱密度$(8.0\pm0.9)\times10^{21}$ cm $^{-2}$,而从X射线光谱拟合中得到的冷气体最佳拟合柱密度为$6.8^{+2.1}_{-1.5}\times10^{22}$ cm $^{-2}$。这两个量表明,分子气体可能只贡献了活动星系核遮蔽的一小部分;然而,它们之间的联系并不简单。IRAS 00183-7111的核区域可能被分层成不同的物质层:一层是内部的,被活动星系核的强辐射场高度电离(从X射线光谱中发现的高电离铁线推断),另一层是外部的,温度较低,从核延伸超过5 kpc(由ALMA观测到的分子气体追踪)。分子气体区也产生了强烈的星暴,SFR $\sim260\pm28$ M $_{\odot}$ yr $^{-1}$。这种核环境的复杂性使得很难确定活动星系核模糊的起源,因为目前可用的数据质量。为了深入研究这一问题,需要在毫米级…
GOALS-JWST: Resolved multi-phase molecular gas in IRAS 20551-4250 using JWST and ALMA
University of Hertfordshire(赫特福德大学);Space Telescope Science Institute(太空望远镜科学研究所);European Southern Observatory(欧洲南方天文台);Joint ALMA Observatory(ALMA联合天文台);California Institute of Technology(加州理工学院);UCLA(加州大学洛杉矶分校);AURA for the European Space Agency (ESA)(欧洲空间局(ESA)AURA);University of Virginia(弗吉尼亚大学);National Radio Astronomy Observatory(美国国家射电天文台)
Early Science with the Large Millimeter Telescope: an energy-driven wind revealed by massive molecular and fast X-ray outflows in the Seyfert Galaxy IRAS 17020+4544
Universidad de Alcalá(阿尔卡拉大学);Instituto de Física Fundamental, CSIC(基础物理研究所,西班牙国家研究委员会);Centro de Astrobiología (CAB), CSIC-INTA(天体生物学中心,西班牙国家研究委员会-国家航空航天技术研究所);George Mason University(乔治梅森大学)
IRAS 07251-0248 E 的观测揭示了一个被遮蔽的紧凑核,其隐藏的AGN正在以类星体亮度发射,同时存在由高浓度气体排出形成的热气泡。