We report the detection of 158 micron [CII] fine-structure line emission from MIPS J142824.0+352619, a hyperluminous (L_IR ~ 10^13 L_sun) starburst galaxy at z=1.3. The line is bright, and corresponds to a fraction L_[CII]/L_FIR = 2 x 10^-3 of the far-IR (FIR) continuum. The [CII], CO, and FIR continuum emission may be modeled as arising from photodissociation regions (PDRs) that have a characteristic gas density of n ~ 10^4.2 cm^-3, and that are illuminated by a far-UV radiation field ~10^3.2 times more intense than the local interstellar radiation field. The mass in these PDRs accounts for approximately half of the molecular gas mass in this galaxy. The L_[CII]/L_FIR ratio is higher than observed in local ULIRGs or in the few high-redshift QSOs detected in [CII], but the L_[CII]/L_FIR and L_CO/L_FIR ratios are similar to the values seen in nearby starburst galaxies. This suggests that MIPS J142824.0+352619 is a scaled-up version of a starburst nucleus, with the burst extended over several kiloparsecs.
ALMA Imaging of Gas and Dust in a Galaxy Protocluster at Redshift 5.3: [CII] Emission in "Typical" Galaxies and Dusty Starbursts ~1 Billion Years after the Big Bang
We report interferometric measurements of [NII] 205 um fine-structure line emission from a representative sample of three galaxies at z=5-6 using the Atacama Large (sub)Millimeter Array (ALMA). These galaxies were previously detected in [CII] and far-infrared continuum emission and span almost two orders of magnitude in star formation rate (SFR). Our results show at least two different regimes of ionized inter-stellar medium properties for galaxies in the first billion years of cosmic time, separated by their L_[CII]/L_[NII] ratio. We find extremely low [NII] emission compared to [CII] (L_ [CI…
We report the serendipitous discovery of a dusty, starbursting galaxy at $z=5.667$ (hereafter called CRLE) in close physical association with the "normal" main-sequence galaxy HZ10 at $z=5.654$. CRLE was identified by detection of [CII], [NII] and CO(2-1) line emission, making it the highest redshift, most luminous starburst in the COSMOS field. This massive, dusty galaxy appears to be forming stars at a rate of at least 1500$\,M_\odot$ yr$^{-1}$ in a compact region only $\sim3$ kpc in diameter. The dynamical and dust emission properties of CRLE suggest an ongoing merger driving the starburst,…
Far-Infrared Line Imaging of the Starburst Ring in NGC 1097 with the Herschel/PACS Spectrometer
NGC 1097是一个邻近的SBb星系，有一个塞弗特核和一个明亮的星暴环。我们研究的星际介质（ISM）的物理特性，在环使用空间分辨远红外光谱图的环核星暴环的NGC 1097，获得与PACS光谱仪上的赫歇尔太空望远镜。特别地，我们绘制了[OI] 63 $μ$ m、[OIII] 88 $μ$ m、[NII] 122 $μ$ m、[CII] 158 $μ$ m和[NII] 205 $μ$ m的重要ISM冷却和诊断发射线。我们观察到，在[OI] 63 $μ$ m，[OIII] 88 $μ$ m，和[NII] 122 $μ$ m的线图中，发射沿环的NE部分成簇增强。我们观察到环核环快速旋转的证据，旋转速度约为220 $ km s$ ^{-1} $ (inclination uncorrected) measured in all lines. The [OI] 63 $ μ $m/[CII] 158 $ μ $m ratio varies smoothly throughout the central region, and is enhanced on the northeastern part of the ring, which may indicate a stronger radiation field. This enhancement coincides with peaks …
We present a study of interstellar medium in the host galaxies of 9 QSOs at 0.1<z<0.2 with blackhole masses of $3\times10^7\,M_\odot$ to $3\times10^9\,M_\odot$ based on the far-IR spectroscopy taken with {\it Herschel Space Observatory}. We detect the [OI]63$μ$m ([CII]158$μ$m) emission in 6(8) out of 8(9) sources. Our QSO sample has far-infrared luminosities (LFIR)~several times $10^{11}L_\odot$. The observed line-to-LFIR ratios (LOI/LFIR and LCII/LFIR) are in the ranges of $2.6\times10^{-4}$-$10^{-2}$ and $2.8\times10^{-4}$-$2\times10^{-3}$ respectively (including upper limits). These ratios …
We present the first attempt to detect outflows from galaxies approaching the Epoch of Reionization (EoR) using a sample of 9 star-forming ($\rm SFR=31\pm 20~M_{\odot}~yr^{-1}$) $z\sim 5.5$ galaxies for which the [CII]158$μ$m line has been previously obtained with ALMA. We first fit each line with a Gaussian function and compute the residuals by subtracting the best fitting model from the data. We combine the residuals of all sample galaxies and find that the total signal is characterised by a flux excess of $\sim 0.5$ mJy extended over $\sim 1000$ km~s$^{-1}$. Although we cannot exclude that …
We explore the detection, with upcoming spectroscopic surveys, of three-dimensional power spectra of emission line fluctuations produced in different phases of the Interstellar Medium (ISM) by ionized carbon, ionized nitrogen and neutral oxygen at redshift z>4. The emission line [CII] from ionized carbon at 157.7 micron, and multiple emission lines from carbon monoxide, are the main targets of planned ground-based surveys, and an important foreground for future space-based surveys like the Primordial Inflation Explorer (PIXIE). However, the oxygen [OI] (145.5 micron) line, and the nitrogen [NI…
Shock-Enhanced C+ Emission and the Detection of H2O from Stephan's Quintet's Group-Wide Shock using Herschel
我们首次用赫歇尔光谱探测到了[OI]63和[CII]158微米的精细结构跃迁，以及斯蒂芬五重奏中35 x 15 kpc^2的受激星系际暗条中的一条para-H2O谱线。这条暗条被认为是当一个高速入侵者与星团内气体碰撞时形成的。PACS光谱仪的观测提供了宽（> 1000 km s^-1）的发光[CII]谱线轮廓以及较暗的[OI] 63微米发射的证据。SPIRE FTS观测揭示了细丝中几个位置的p-H2O（111-000）跃迁的水发射，但没有其他分子线。H2O谱线很窄，可能与密度较大的中速气体经历最强的冲击加热有关。[CII]/PAH（tot）和[CII]/FIR比率太大，无法通过PDR中的正常光电加热来解释。也可以排除HII区激发或X射线/宇宙射线加热。观测结果得出的结论是，大部分分子气体是扩散和温暖的。我们建议，[CII]，[OI]和暖H2线的发射是由一个湍流级联，其中的动能从星系碰撞与IGM耗散到小尺度和低速度，通过冲击和湍流涡旋。低速磁震可以帮助解释[CII]/[OI]比值和观察到的相对较高的[CII]/H2比值。发现[CII]发射可以增强，在大规模的湍流区域的碰撞环境中的影响的解释[CII]发射在高z星系。
