论文标题
z = 4.72的超发光星爆伯斯特通过镜头星系对在z = 1.48上放大
A hyper luminous starburst at z=4.72 magnified by a lensing galaxy pair at z=1.48
论文作者
论文摘要
[删节]我们在Herschel参考调查中发现了一个非常明亮的IR源，$ s_ {500} $ 〜120mjy（红色处女座4- rv4）。基于IRAM/EMIR和IRAM/NOEMA的CO（5-4），CO（4-3）和[CI]线的检测，RV4位于Z = 4.724，产生了总共观察到的L $ _ {ir} $ 1.1 +//- 0.6x0 $^{14} $ l $ _ $ _ $ _ {1.1 +/- 0.6x0 $ _ = {在Herschel发射的位置，用VLA在10厘米处检测到三个斑点。每个BLOB的CO（5-4）线检测确认它们处于相同的线宽度相同的红移，表明它们是同一源的多个图像。在Spitzer和深层光学观察中，在三个VLA/NOEMA斑点的中心检测到了两个来源，即Hig-Z镜头1（HL1）West和HL1 East。这两个源用Xshooter光谱放置在z = 1.48，这表明它们可以合并并在重力上镜头rv4的发射。 HL1是在强镜头系统中已知的第二大镜头。 The Einstein radius of the lensing system is 2.2"+/-0.2 (20kpc). The high redshift of HL1 and the large Einstein radius are highly unusual for a strong lensing system. We present the ISM properties of the background source RV4. Different estimates of the gas depletion time yield low values suggesting that RV4 is a SB galaxy. Among all high-z SMGs, this source exhibits one of最低的l $ _ {[CI]} $ to l $ _ {ir} $比率，3.2 +/- 0.9x10 $^{ - 6} $，建议只有14 +/- 5myr的极短的气体tdepl，也显示了相对较高的L $ _ {[CI]} $_-----0.7---0。 l $ _ {co（5-4）} $ to $ _ {ir} $比率（只有预期的正常星系的价值的50％）暗示了低密度的气体，我们可以通过一个很高的sfe来解释RV4的短TDEPL tdepl朝低价值。
[Abridged] We discovered in the Herschel Reference Survey an extremely bright IR source with $S_{500}$~120mJy (Red Virgo 4 - RV4). Based on IRAM/EMIR and IRAM/NOEMA detections of the CO(5-4), CO(4-3), and [CI] lines, RV4 is located at z=4.724, yielding a total observed L$_{IR}$ of 1.1+/-0.6x0$^{14}$L$_{\odot}$. At the position of the Herschel emission, three blobs are detected with the VLA at 10cm. The CO(5-4) line detection of each blob confirms that they are at the same redshift with the same line width, indicating that they are multiple images of the same source. In Spitzer and deep optical observations, two sources, High-z Lens 1 (HL1) West and HL1 East, are detected at the center of the three VLA/NOEMA blobs. These two sources are placed at z=1.48 with XSHOOTER spectra, suggesting that they could be merging and gravitationally lensing the emission of RV4. HL1 is the second most distant lens known to date in strong lensing systems. The Einstein radius of the lensing system is 2.2"+/-0.2 (20kpc). The high redshift of HL1 and the large Einstein radius are highly unusual for a strong lensing system. We present the ISM properties of the background source RV4. Different estimates of the gas depletion time yield low values suggesting that RV4 is a SB galaxy. Among all high-z SMGs, this source exhibits one of the lowest L$_{[CI]}$ to L$_{IR}$ ratios, 3.2+/-0.9x10$^{-6}$, suggesting an extremely short gas tdepl of only 14+/-5Myr. It also shows a relatively high L$_{[CI]}$ to L$_{CO(4-3)}$ ratio (0.7+/-0.2) and low L$_{CO(5-4)}$ to L$_{IR}$ ratio (only ~50% of the value expected for normal galaxies) hinting a low density of gas. Finally, we discuss that the short tdepl of RV4 can be explained by either a very high SFE, which is difficult to reconcile with major mergers simulations of high-z galaxies, or a rapid decrease of SF, which would bias the estimate of tdepl toward low value.
