arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0904.0028astro-ph.CO
收藏

近红外选择星系扩展钱德拉深场南亚毫米特性的LABOCA巡天

A LABOCA survey of the Extended Chandra Deep Field South - submillimeter properties of near-IR selected galaxies

T. R. Greve, A. Weiss, F. Walter, I. Smail, X. Z. Zheng, K. K. Knudsen, K. E. K. Coppin, A. Kovacs, E. F. Bell, C. de Breuck, H. Dannerbauer, M. Dickinson, E. G… 展开作者

T. R. Greve, A. Weiss, F. Walter, I. Smail, X. Z. Zheng, K. K. Knudsen, K. E. K. Coppin, A. Kovacs, E. F. Bell, C. de Breuck, H. Dannerbauer, M. Dickinson, E. Gawiser, D. Lutz, H. -W. Rix, E. Schinnerer, D. Alexander, F. Bertoldi, W. N. Brandt, S. C. Chapman, R. J. Ivison, A. M. Koekemoer, E. Kreysa, P. Kurczynski, K. Menten, G. Siringo, M. Swinbank, P. van der Werf

摘要:

利用阿塔卡马探路者实验(APEX)上的大顶点BOlometer CAmera(LABOCA)获得的330小时ESO-MPG 870微米扩展钱德拉深场南(ECDF-S)测量,我们对8266个近红外(近红外)样品进行了亚毫米(submm)波长的叠加分析。(K_vega <= 20)个星系,包括893个BzK星系,1253个极红天体(ERO)和737个遥远红星系(DRG)。对于K_vega <= 20、BzK、ERO和DRG样品,我们测量的平均870微米通量分别为0.20+-0.01mJy(20.0sigma)、0.45+-0.04mJy(11.3sigma)、0.42+-0.03mJy(14.0sigma)和0.41+-0.04mJy(10.3sigma)。对于BzK,ERO和DRG子样本,它们在某种程度上重叠,并且类似于z ~ 1-2,这意味着平均远红外光度为~2- 6 × 10 ^{11} Lsolar,恒星形成速率为~40- 100 Msolar。将BzK星系分为恒星形成星系(sBzK)和被动星系(pBzK),前者被显著探测到(0.48 ± 0.04mJy,12.0 σ),而后者仅被勉强探测到(0.27 ± 0.10mJy,2.7 σ),从而证实sBzK/pBzK标准确实分离出了遮蔽的、恒星形成的和真正被动的星系。K_vega ≤ 20个星系对870 μ m河外背景光的贡献为6.6 ± 0.3Jy deg^{-2}(~15%)。sBzK和pBzK星系对EBL的贡献分别为1.7+-0.2Jy deg^{-2}(~4%)和0.2+-0.1 Jy deg^{-2}(< 0.5%)。[删节]

英文摘要:

Using the 330hr ESO-MPG 870-micron survey of the Extended Chandra Deep Field South (ECDF-S) obtained with the Large Apex BOlometer CAmera (LABOCA) on the Atacama Pathfinder EXperiment (APEX), we have carried out a stacking analysis at submillimeter (submm) wavelengths of a sample of 8266 near-infra-red (near-IR) selected (K_vega <= 20) galaxies, including 893 BzK galaxies, 1253 extremely red objects (EROs) and 737 distant red galaxies (DRGs), selected from the Multi-wavelength Survey by Yale-Chile (MUSYC). We measure average 870-micron fluxes of 0.20+-0.01mJy (20.0sigma), 0.45+-0.04mJy (11.3sigma), 0.42+-0.03mJy (14.0sigma), and 0.41+-0.04mJy (10.3sigma) for the K_vega <= 20, BzK, ERO and DRG samples, respectively. For the BzK, ERO and DRG subsamples, which overlap to some degree and are like to be at z ~ 1-2, this implies an average far-IR luminosity of ~2-6x10^{11} Lsolar and star formation rate of ~40-100Msolar. Splitting the BzK galaxies up into star-forming (sBzK) and passive (pBzK) galaxies, the former is significantly detected (0.48+-0.04mJy, 12.0sigma) while the latter is only marginally detected (0.27+-0.10mJy, 2.7sigma), thus confirming that the sBzK/pBzK criteria do isolate obscured, star forming and truly passive galaxies. The K_vega <= 20 galaxies are found to contribute with 6.6+-0.3Jy deg^{-2} (~15%) to the 870-micron extragalactic background light (EBL). sBzK and pBzK galaxies contribute 1.7+-0.2Jy deg^{-2} (~4%) and 0.2+-0.1 Jy deg^{-2} (< 0.5%) to the EBL. [Abridged]

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。

↑