Planck intermediate results. LV. Reliability and thermal properties of high-frequency sources in the Second Planck Catalogue of Compact Sources
Planck Collaboration, Y. Akrami, M. Ashdown, J. Aumont, C. Baccigalupi, M. Ballardini, A. J. Banday, R. B. Barreiro, N. Bartolo, S. Basak, K. Benabed, J. -P. Be… 展开作者
Planck Collaboration, Y. Akrami, M. Ashdown, J. Aumont, C. Baccigalupi, M. Ballardini, A. J. Banday, R. B. Barreiro, N. Bartolo, S. Basak, K. Benabed, J. -P. Bernard, M. Bersanelli, P. Bielewicz, J. R. Bond, J. Borrill, F. R. Bouchet, C. Burigana, E. Calabrese, P. Carvalho, H. C. Chiang, B. P. Crill, F. Cuttaia, A. de Rosa, G. de Zotti, J. Delabrouille, J. -M. Delouis, E. Di Valentino, J. M. Diego, X. Dupac, S. Dusini, G. Efstathiou, F. Elsner, T. A. Enßlin, H. K. Eriksen, R. Fernandez-Cobos, F. Finelli, A. A. Fraisse, E. Franceschi, A. Frolov, S. Galeotta, K. Ganga, M. Gerbino, J. González-Nuevo, K. M. Górski, S. Gratton, A. Gruppuso, J. E. Gudmundsson, W. Handley, F. K. Hansen, D. Herranz, E. Hivon, M. Hobson, Z. Huang, W. C. Jones, E. Keihänen, R. Keskitalo, J. Kim, T. S. Kisner, N. Krachmalnicoff, M. Kunz, H. Kurki-Suonio, J. -M. Lamarre, A. Lasenby, M. Lattanzi, C. R. Lawrence, M. Le Jeune, F. Levrier, P. B. Lilje, V. Lindholm, M. López-Caniego, Y. -Z. Ma, J. F. Macías-Pérez, G. Maggio, N. Mandolesi, A. Marcos-Caballero, M. Maris, P. G. Martin, E. Martínez-González, S. Matarrese, N. Mauri, J. D. McEwen, M. Migliaccio, D. Molinari, A. Moneti, L. Montier, G. Morgante, P. Natoli, D. Paoletti, B. Partridge, F. Perrotta, V. Pettorino, F. Piacentini, G. Polenta, J. -L. Puget, J. P. Rachen, M. Reinecke, M. Remazeilles, A. Renzi, G. Rocha, G. Roudier, B. Ruiz-Granados, M. Savelainen, D. Scott, G. Sirri, L. D. Spencer, A. -S. Suur-Uski, J. A. Tauber, D. Tavagnacco, M. Tenti, L. Toffolatti, M. Tomasi, T. Trombetti, J. Valiviita, B. Van Tent, P. Vielva, F. Villa, I. K. Wehus, A. Zacchei, A. Zonca
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55 pages. Accepted for publication in A&A. The BeeP catalogue will be published in the Planck Legacy Archive (https://pla.esac.esa.int/pla)
We describe an extension of the most recent version of the Planck Catalogue of Compact Sources (PCCS2), produced using a new multi-band Bayesian Extraction and Estimation Package (BeeP). BeeP assumes that the compact sources present in PCCS2 at 857 GHz have a dust-like spectral energy distribution, which leads to emission at both lower and higher frequencies, and adjusts the parameters of the source and its SED to fit the emission observed in Planck's three highest frequency channels at 353, 545, and 857 GHz, as well as the IRIS map at 3000 GHz. In order to reduce confusion regarding diffuse cirrus emission, BeeP's data model includes a description of the background emission surrounding each source, and it adjusts the confidence in the source parameter extraction based on the statistical properties of the spatial distribution of the background emission. BeeP produces the following three new sets of parameters for each source: (a) fits to a modified blackbody (MBB) thermal emission model of the source; (b) SED-independent source flux densities at each frequency considered; and (c) fits to an MBB model of the background in which the source is embedded. BeeP also calculates, for each source, a reliability parameter, which takes into account confusion due to the surrounding cirrus. We define a high-reliability subset (BeeP/base), containing 26 083 sources (54.1 per cent of the total PCCS2 catalogue), the majority of which have no information on reliability in the PCCS2. The results of the BeeP extension of PCCS2, which are made publicly available via the PLA, will enable the study of the thermal properties of well-defined samples of compact Galactic and extra-galactic dusty sources.
Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue
我们研究了年轻的主序前恒星的运动学性质。我们根据盖亚DR 2目录中的数据，通过调用一些测光红外巡天来选择这些恒星。利用视差误差小于20%的4564颗恒星，得到了银河系自转角速度的参数：$Ω_0 =28.84\pm0.10$ km s $^{-1}$ kpc $^{-1}$，$Ω^{'}_0=-4.063\pm0.029$ km s $^{-1}$ kpc $^{-2}$和$Ω^{''}_0=0.766\pm0.020$ km s $^{-1}$ kpc $^{-3}$，其中Oort常数为$A=16.25\pm0.33$ km s $^{-1}$ kpc $^{-1}$和$B=-12.58\pm0.34$ km s $^{-1}$ kpc $^{-1}$ .对于采用的太阳银心距离$R_0=8.0\pm0.15$ kpc，太阳邻域绕银河系中心的圆自转速度为$V_0=230.7\pm4.4$ km s $^{-1}$。所考虑的恒星的剩余速度色散被证明是低的，这表明他们是非常年轻的。Herbig Ae/Be星的剩余速度色散在三个坐标上的平均值为$\sim$ 11 km s $^{-1}$，金牛T星的剩余速度色散为$\sim$ 7 km s $^{-1}$。
Candidate high-z proto-clusters among the Planck compact sources, as revealed by Herschel-SPIRE
通过确定在赫歇尔大型巡天808.4 ° ^2范围内的所有普朗克致密源的性质，我们已经确定了27个尘埃恒星形成星系（DSFG）的候选原星系团，它们在250、350或500 $μ$ mm的源中至少过密3σ。我们发现大约一半的普朗克紧凑源被赫歇尔分解成多个离散的物体，另一半则被赫歇尔分解。我们发现一个显着的差异版本的普朗克目录，与较早的版本举办了更大比例的候选原星团和银河卷云比后来的版本，我们归因于在创建的三个目录中使用的过滤器的差异。我们发现DSFG候选原团簇的表面密度为（3.3 $\pm$ 0.7）x 10^（-2）个源deg^（-2），与以前的类似研究非常一致。我们发现，普朗克颜色选择的S_{857} / S_{545} < 2的作品很好地选择候选的原簇，但可以错过原簇在z < 2. The Herschel colours of individual candidate proto-cluster members indicate our candidate proto-clusters all likely all lie at z >1。即使在最保守的估计中，我们的候选原星系团在353 GHz处的亮度也是模拟预期的5倍。需要进一步的观测来确认这些候选的原团是物理团，沿着视线的多个原团，还是无关联源的偶然排列。
Galactic Rotation Parameters Based on Stars from Activ Star-Forming Regions with Data from the Gaia DR2 Catalogue
我们研究了Gaia DR 2星表中25000多颗具有自行和三角运动的年轻恒星样本。其相对误差不超过10%。马顿等人根据盖亚DR 2星表的数据，通过调用WISE和普朗克星表的红外测量，选择了属于活跃恒星形成区的恒星。低质量的金牛座T星构成了大多数样本星。由此得到了银河系自转角速度的下列参数：$Ω_0 =28.40\pm0.11$ km s $^{-1}$ kpc $^{-1}$，$Ω^{'}_0=-3.933\pm0.033$ km s $^{-1}$ kpc $^{-2}$和$Ω^{''}_0=0.804\pm0.040$ km s $^{-1}$ kpc $^{-3}$。奥尔特常数为$A=15.73\pm0.32$ km s $^{-1}$ kpc $^{-1}$和$B=-12.67\pm0.34$ km s $^{-1}$ kpc $^{-1}$，而对于所采用的太阳银心距离$R_0=8.0\pm0.15$ kpc，太阳邻域绕银河系中心的圆周旋转速度为$V_0=227\pm4$ km s $^{-1}$。
