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arXiv 1302.4895astro-ph.CO
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通过宇宙时间的红外SED的赫歇尔普查

The Herschel census of infrared SEDs through cosmic time

Myrto Symeonidis, M. Vaccari, S. Berta, M. J. Page, D. Lutz, V. Arumugam, H. Aussel, J. Bock, A. Boselli, V. Buat, P. L. Capak, D. L. Clements, A. Conley, L. Co… 展开作者

Myrto Symeonidis, M. Vaccari, S. Berta, M. J. Page, D. Lutz, V. Arumugam, H. Aussel, J. Bock, A. Boselli, V. Buat, P. L. Capak, D. L. Clements, A. Conley, L. Conversi, A. Cooray, C. D. Dowell, D. Farrah, A. Franceschini, E. Giovannoli, J. Glenn, M. Griffin, E. Hatziminaoglou, H. -S. Hwang, E. Ibar, O. Ilbert, R. J. Ivison, E. Le Floc'h, S. Lilly, J. S. Kartaltepe, B. Magnelli, G. Magdis, L. Marchetti, H. T. Nguyen, R. Nordon, B. O'Halloran, S. J. Oliver, A. Omont, A. Papageorgiou, H. Patel, C. P. Pearson, I. Perez-Fournon, M. Pohlen, P. Popesso, F. Pozzi, D. Rigopoulou, L. Riguccini, D. Rosario, I. G. Roseboom, M. Rowan-Robinson, M. Salvato, B. Schulz, Douglas Scott, N. Seymour, D. L. Shupe, A. J. Smith, I. Valtchanov, L. Wang, C. K. Xu, M. Zemcov, S. Wuyts

摘要:

利用来自COSMOS和GOODS(N+S)的最深SPIRE和PACS巡天(HerMES和PEP)的Herschel数据,我们研究了0.1<z<2的红外发光(L_IR> 10^10L_sun)星系的尘埃性质,并确定了它们如何随宇宙时间演化。这项工作的独特角度是对调查选择效应的严格分析,使其成为第一个在几乎完全没有选择偏见的框架内研究恒星形成主导的IR发光人口的研究。我们发现,红外发光的星系有广泛的远红外峰值的特征冷/延长尘埃排放和平均尘埃温度在25- 45 K范围内的SED。热(T> 45 K)的SED和冷(T<25 K)的卷云主导的SED都是罕见的,大多数源都在温暖的恒星暴增(如M82)和冷的螺旋星系(如M51)所占据的范围内。我们观测到一个光度-温度(L-T)关系,log[L_IR/L_sun]=12.5的星系的平均尘埃温度比log[L_IR/L_sun]=10.5的星系高出约10 K。然而,虽然在更明亮的系统中增加的尘埃加热是L-T关系背后的驱动因素,尘埃质量和/或星暴大小与光度的增加在塑造它中起着主导作用。我们的研究结果表明,在红外发光源的尘埃条件随宇宙时间的演变:在高红移,尘埃温度平均高达10 K低于当地测量。这表现为L-T关系的平坦化,表明早期宇宙中的(U)LIRG通常具有比局部等效源更广泛的尘埃分布和/或更高的尘埃质量的特征。有趣的是,尘埃温度的演化与光度有关,从z~0到z~2,T<35 K的LIRGs的分数增加了2倍,而T<35 K的ULIRGs的分数增加了6倍。

英文摘要:

Using Herschel data from the deepest SPIRE and PACS surveys (HerMES and PEP) in COSMOS and GOODS (N+S), we examine the dust properties of IR-luminous (L_IR>10^10 L_sun) galaxies at 0.1<z<2 and determine how these evolve with cosmic time. The unique angle of this work is the rigorous analysis of survey selection effects, making this the first study of the star-formation-dominated, IR-luminous population within a framework almost entirely free of selection biases. We find that IR-luminous galaxies have SEDs with broad far-IR peaks characterised by cool/extended dust emission and average dust temperatures in the 25-45K range. Hot (T>45K) SEDs and cold (T<25K), cirrus-dominated SEDs are rare, with most sources being within the range occupied by warm starbursts such as M82 and cool spirals such as M51. We observe a luminosity-temperature (L-T) relation, where the average dust temperature of log[L_IR/L_sun]=12.5 galaxies is about 10K higher than that of their log[L_IR/L_sun]=10.5 counterparts. However, although the increased dust heating in more luminous systems is the driving factor behind the L-T relation, the increase in dust mass and/or starburst size with luminosity plays a dominant role in shaping it. Our results show that the dust conditions in IR-luminous sources evolve with cosmic time: at high redshift, dust temperatures are on average up to 10K lower than what is measured locally. This is manifested as a flattening of the L-T relation, suggesting that (U)LIRGs in the early Universe are typically characterised by a more extended dust distribution and/or higher dust masses than local equivalent sources. Interestingly, the evolution in dust temperature is luminosity dependent, with the fraction of LIRGs with T<35K showing a 2-fold increase from z~0 to z~2, whereas that of ULIRGs with T<35K shows a 6-fold increase.

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