arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1402.3600astro-ph.GAastro-ph.CO
收藏

[S III ]λλ9096,9532发射体在z = 1.34和1.23时的性质

The nature of [S III]λλ9096, 9532 emitters at z = 1.34 and 1.23

F. X. An, X. Z. Zheng, Y. Z. Meng, Y. Chen, Z. Z. Wen, G. L. Lü

摘要:

使用我们的深窄带$H_2S1$(中心在2.13 $μ$ m)成像调查的扩展钱德拉深场南(ECDFS)的研究[S III] $λ\lambda9096,9532$发射器在$z$ = 1.34和1.23。我们结合我们的数据与ECDFS的多波长数据,建立光谱能量分布(SED)从$U$的$K_{s}$ -波段的发射极候选人选择与强过剩的$H_2S1 - K_{s}$和推导光度红移,线光度,恒星质量和消光。用$H_2S1<22.8$和$K_{\rm s}<24.8$(AB)在381弧分$^{2}$面积上鉴定了14个[S III]发射体样品,其[S III]线光度为$L_{[SIII]}= \sim 10^{41.5-42.6}$ erg s $^{-1}$。在最深的钱德拉4 Ms观测中,没有发现[S III]发射体有X射线对应物,这表明它们不太可能由活动星系核提供动力。HST/ACS F606 W和HST/WFC 3 F160 W图像显示了它们的静止帧UV和光学形态。大约一半的[S III]发射体是合并的,至少三分之一是盘状星系。几乎所有的[S III]发射体在其SED中表现出突出的巴耳末突变,表明存在显著的星暴后成分。两者合计,我们的研究结果意味着,无论是冲击加热后的星暴和年轻的大质量恒星所造成的光电离很可能激发强[S III]发射线。我们的结论是,在我们的样本中的发射器是由恒星质量$8.7<\log (M/M_{sun})<9.9$的恒星形成星系为主。

英文摘要:

A study of [S III]$λ\lambda9096,9532$ emitters at $z$ = 1.34 and 1.23 is presented using our deep narrow-band $H_2S1$ (centered at 2.13 $μ$m) imaging survey of the Extended Chandra Deep Field South (ECDFS). We combine our data with multi-wavelength data of ECDFS to build up spectral energy distributions (SEDs) from the $U$ to the $K_{s}$-band for emitter candidates selected with strong excess in $H_2S1 - K_{s}$ and derive photometric redshifts, line luminosities, stellar masses and extinction. A sample of 14 [S III] emitters are identified with $H_2S1<22.8$ and $K_{\rm s}<24.8$ (AB) over 381 arcmin$^{2}$ area, having [S III] line luminosity $L_{[SIII]}= \sim 10^{41.5-42.6}$erg s$^{-1}$. None of the [S III] emitters is found to have X-ray counterpart in the deepest Chandra 4 Ms observation, suggesting that they are unlikely powered by AGN. HST/ACS F606W and HST/WFC3 F160W images show their rest-frame UV and optical morphologies. About half of the [S III] emitters are mergers and at least one third are disk-type galaxies. Nearly all [S III] emitters exhibit a prominent Balmer break in their SEDs, indicating the presence of a significant post-starburst component. Taken together, our results imply that both shock heating in post-starburst and photoionization caused by young massive stars are likely to excite strong [S III] emission lines. We conclude that the emitters in our sample are dominated by star-forming galaxies with stellar mass $8.7<\log (M/M_{sun})<9.9$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑