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arXiv 1801.02635astro-ph.GA
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暗能量巡天中z~2类星体的紫外发光恒星形成过程

UV-Luminous, Star-Forming Hosts of z~2 Reddened Quasars in the Dark Energy Survey

C. F. Wethers, M. Banerji, P. C. Hewett, C. A. Lemon, R. G. McMahon, S. L. Reed, Y. Shen, F. B. Abdalla, A. Benoit-Lévy, D. Brooks, E. Buckley-Geer, D. Capozzi,… 展开作者

C. F. Wethers, M. Banerji, P. C. Hewett, C. A. Lemon, R. G. McMahon, S. L. Reed, Y. Shen, F. B. Abdalla, A. Benoit-Lévy, D. Brooks, E. Buckley-Geer, D. Capozzi, A. Carnero Rosell, M. CarrascoKind, J. Carretero, C. E. Cunha, C. B. D'Andrea, L. N. da Costa, D. L. DePoy, S. Desai, P. Doel, B. Flaugher, P. Fosalba, J. Frieman, J. García-Bellido, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, K. Honscheid, D. J. James, T. Jeltema, K. Kuehn, S. Kuhlmann, N. Kuropatkin, M. Lima, M. A. G. Maia, J. L. Marshall, P. Martini, F. Menanteau, R. Miquel, R. C. Nichol, B. Nord, A. A. Plazas, A. K. Romer, E. Sanchez, V. Scarpine, R. Schindler, M. Schubnell, I. Sevilla-Noarbe, M. Smith, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, G. Tarle, A. R. Walker

摘要:

我们首次在$1.5 < z < 2.7$对17个严重变红的高光度(E(B-V)$_{\rm{QSO}}\gtrsim$ 0.5; L $_{\rm{bol}}>$ 10 $^{46}$ ergs $^{-1}$)宽线类星体进行了静止框架紫外布居研究。我们结合了第一年的深,光学,地面观测从暗能量调查(DES)与近红外VISTA半球调查(VHS)和UKIDSS大面积调查(ULAS)的数据,从红化类星体最初确定。我们证明,显着的尘埃红向类星体在我们的样本中允许主机星系的发射被检测到的DES测光探测的休息帧紫外波长。通过利用这种红化效应,我们解开类星体的发射从宿主星系通过光谱能量分布(SED)拟合。我们在至少10个类星体中发现了一个相对清晰的恒星形成宿主星系的证据,另外3个类星体的辐射与恒星形成或散射光一致。从静止帧的紫外辐射,我们得到瞬时,尘埃校正的恒星形成率(SFR)的范围为25 < SFR $_{\rm{UV}}$ < 365 M $_{\odot}$ yr $^{-1}$,平均SFR $_{\rm{UV}}$ = 130 $\pm$ 95 M $_{\odot}$ yr $^{-1}$。我们发现SFR $_{\rm{UV}}$和测热类星体光度之间存在广泛的相关性。总的来说,我们的研究结果表明,在星系形成的高峰时期,在发光的变红类星体中发生了同时代的恒星形成和黑洞吸积的证据。

英文摘要:

We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity (E(B-V)$_{\rm{QSO}}\gtrsim$ 0.5; L$_{\rm{bol}}>$ 10$^{46}$ergs$^{-1}$) broad-line quasars at $1.5 < z < 2.7$. We combine the first year of deep, optical, ground-based observations from the Dark Energy Survey (DES) with the near infrared VISTA Hemisphere Survey (VHS) and UKIDSS Large Area Survey (ULAS) data, from which the reddened quasars were initially identified. We demonstrate that the significant dust reddening towards the quasar in our sample allows host galaxy emission to be detected at the rest-frame UV wavelengths probed by the DES photometry. By exploiting this reddening effect, we disentangle the quasar emission from that of the host galaxy via spectral energy distribution (SED) fitting. We find evidence for a relatively unobscured, star-forming host galaxy in at least ten quasars, with a further three quasars exhibiting emission consistent with either star formation or scattered light. From the rest-frame UV emission, we derive instantaneous, dust-corrected star formation rates (SFRs) in the range 25 < SFR$_{\rm{UV}}$ < 365 M$_{\odot}$yr$^{-1}$, with an average SFR$_{\rm{UV}}$ = 130 $\pm$ 95 M$_{\odot}$yr$^{-1}$. We find a broad correlation between SFR$_{\rm{UV}}$ and the bolometric quasar luminosity. Overall, our results show evidence for coeval star formation and black hole accretion occurring in luminous, reddened quasars at the peak epoch of galaxy formation.

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