书布望远镜完成镜面对齐北京时间2月11日,美国航天局(NASA)公布了詹姆斯·韦布太空望远镜(James Webb Space Telescope,缩写JWST)所拍摄的第一颗恒星图像:黑色的背景上,有18个模糊的白点,它们显示的都是大熊座当中一颗明亮、孤独的...书布望远镜完成镜面对齐北京时间2月11日,美国航天局(NASA)公布了詹姆斯·韦布太空望远镜(James Webb Space Telescope,缩写JWST)所拍摄的第一颗恒星图像:黑色的背景上,有18个模糊的白点,它们显示的都是大熊座当中一颗明亮、孤独的恒坫--HD 84406。同时公布的还有JWST的一张“自拍照”,由红外相机(NIRCam)内部的一个特殊镜头拍摄,帮助校准主镜。展开更多
A study of[S Ⅲ]λλ9096,9532 emitters at z=1.34 and 1.23 is presented using our deep narrow-band H2S 1(centered at 2.13μm)imaging survey of the Extended Chandra Deep Field South(ECDFS).We combine our data with multi...A study of[S Ⅲ]λλ9096,9532 emitters at z=1.34 and 1.23 is presented using our deep narrow-band H2S 1(centered at 2.13μm)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 Ks-band for emitter candidates selected with strong excess in H2S 1 Ks and derive photometric redshifts,line luminosities,stellar masses and extinction.A sample of 14[S Ⅲ]emitters are identified with H2S 1<22.8 and Ks<24.8(AB)over 381 arcmin2area,having[S Ⅲ]line luminosity L[S Ⅲ]=~1041.5 42.6erg 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 AGNs.The 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[S Ⅲ]emitters in our sample are dominated by star-forming galaxies(SFGs)with stellar mass 8.7<log(M/M⊙)<9.9.展开更多
文摘书布望远镜完成镜面对齐北京时间2月11日,美国航天局(NASA)公布了詹姆斯·韦布太空望远镜(James Webb Space Telescope,缩写JWST)所拍摄的第一颗恒星图像:黑色的背景上,有18个模糊的白点,它们显示的都是大熊座当中一颗明亮、孤独的恒坫--HD 84406。同时公布的还有JWST的一张“自拍照”,由红外相机(NIRCam)内部的一个特殊镜头拍摄,帮助校准主镜。
基金This research uses data obtained through the Telescope Access Program(TAP),which is funded by the National Astronomical Observatories and the Special Fund for Astronomy from the Ministry of Financesupported by the National Basic Research Program of China(GrantNo.2013CB834900)the National Natural Science Foundation of China(Grant No.11063002)
文摘A study of[S Ⅲ]λλ9096,9532 emitters at z=1.34 and 1.23 is presented using our deep narrow-band H2S 1(centered at 2.13μm)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 Ks-band for emitter candidates selected with strong excess in H2S 1 Ks and derive photometric redshifts,line luminosities,stellar masses and extinction.A sample of 14[S Ⅲ]emitters are identified with H2S 1<22.8 and Ks<24.8(AB)over 381 arcmin2area,having[S Ⅲ]line luminosity L[S Ⅲ]=~1041.5 42.6erg 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 AGNs.The 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[S Ⅲ]emitters in our sample are dominated by star-forming galaxies(SFGs)with stellar mass 8.7<log(M/M⊙)<9.9.
