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arXiv 2101.02101astro-ph.GA
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极亮射电智慧选择星系的黑洞质量

The black hole masses of extremely luminous radio-WISE selected galaxies

E. R. Ferris, A. W. Blain, R. J. Assef, N. A. Hatch, A. Kimball, M. Kim, A. Sajina, A. Silva, D. Stern, T. Diaz-Santos, C-W. Tsai, D. Wylezalek

摘要:

我们目前的近红外测光和光谱的30个极其明亮的无线电和中红外选定的星系。随着辐射热光度超过$\sim10^{13}$ $\rm{L_{\odot}}$和红移范围从$z = 0.880-2.853$,我们使用VLT仪器X射手和ISAAC调查这个独特的人口星系。在18个星系中检测到宽的多分量发射线,我们分别在6个、15个和13个星系中测量了近红外线$\rm{H\rmβ}$、$\text{[OIII]}\rmλ\rmλ4959,5007$和$\rm{H\rmα}$,在UVB臂中还检测到10条$\text{[OIII]}\rmλ5007$和5条CIV线。并导出了超大质量黑洞质量$10^{7.9}$-$10^{9.4}$ $\text{M}_{\odot}$的下限,并给出了相应的宿主质量$10^{10.4}$-$10^{12.0}$ $\text{M}_{\odot}$的期望值。我们在$2σ$显著性下测量这些源中的八个的$\rmλ_{Edd}$ > 1。近红外测光和SED拟合被用来直接比较恒星质量。我们检测到两个巴耳末线在五个星系,并使用这些来推断平均可见光消光$A_{V}$ = 2.68马格。由于我们的$\rm{H\rmβ}$发射线测量的非检测和不确定性,我们模拟了广泛的$\rm{H\rmβ}$线的FWHM = 1480 $\rm{kms^{-1}}$估计消光测量$\rm{H\rmα}$发射的所有来源。然后,我们用它来推断平均$A_{V}=3.62$等,展示了这些星系的高度模糊的性质,在最极端和模糊的情况下,我们对黑洞质量的估计增加了0.5个数量级。

英文摘要:

We present near-IR photometry and spectroscopy of 30 extremely luminous radio and mid-IR selected galaxies. With bolometric luminosities exceeding $\sim10^{13}$ $\rm{L_{\odot}}$ and redshifts ranging from $z = 0.880-2.853$, we use VLT instruments X-shooter and ISAAC to investigate this unique population of galaxies. Broad multi-component emission lines are detected in 18 galaxies and we measure the near-IR lines $\rm{H\rmβ}$, $\text{[OIII]}\rmλ\rmλ4959,5007$ and $\rm{H\rmα}$ in six, 15 and 13 galaxies respectively, with 10 $\rm{Lyα}$ and five CIV lines additionally detected in the UVB arm. We use the broad $\text{[OIII]}\rmλ5007$ emission lines as a proxy for the bolometric AGN luminosity, and derive lower limits to supermassive black hole masses of $10^{7.9}$-$10^{9.4}$ $\text{M}_{\odot}$ with expectations of corresponding host masses of $10^{10.4}$-$10^{12.0}$ $\text{M}_{\odot}$. We measure $\rmλ_{Edd}$ > 1 for eight of these sources at a $2σ$ significance. Near-IR photometry and SED fitting are used to compare stellar masses directly. We detect both Balmer lines in five galaxies and use these to infer a mean visual extinction of $A_{V}$ = 2.68 mag. Due to non-detections and uncertainties in our $\rm{H\rmβ}$ emission line measurements, we simulate a broad $\rm{H\rmβ}$ line of FWHM = 1480 $\rm{kms^{-1}}$ to estimate extinction for all sources with measured $\rm{H\rmα}$ emission. We then use this to infer a mean $A_{V}=3.62$ mag, demonstrating the highly-obscured nature of these galaxies, with the consequence of increasing our estimates of black-hole masses by an 0.5 orders of magnitude in the most extreme and obscured cases.

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