arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1710.03469astro-ph.GAastro-ph.CO
收藏

用红外总光度标定WISE中的恒星形成

Calibrating Star Formation in WISE using Total Infrared Luminosity

M. E. Cluver, T. H. Jarrett, D. A. Dale, J. -D. T. Smith, T. August, M. J. I. Brown

摘要:

本文给出了SINGS和KINGFISH组合样本中星系的精确分辨$WISE$测光。在W3 - 12 $μ$ m和W 4 - 23 $μ$ m波段的光度进行了校准,以恒星形成率(SFR)使用总红外光度,避免UV/光学的不确定性,由于尘埃消光校正。W3关系的1- $σ$散射为0.15 dex,在SFR和12 $μ$ m光度的近5个数量级上,宿主恒星质量的范围从矮星系(10 $^7$ M $_\odot$)到$\sim3\times$ M $_\star$(10 $^{11.5}$ M $_\odot$)星系。在没有深硅酸盐吸收功能和强大的活动星系核,我们希望这是一个可靠的SFR指标,主要是由于广泛的性质的W3带。相比之下,W 4 SFR关系显示出更多的分散(1- $σ=$ 0.18 dex)。这两种关系都显示出与射电连续统导出的SFR的合理一致性,并且与所谓的“混合”H $α+ 24 μ$ m和FUV $+$ 24 $μ$ m指标非常一致。此外,$WISE$ SFR关系似乎对样品中的金属丰度范围不敏感。我们还将我们的结果与IRAS选择的亮红外星系进行了比较,表明$WISE$关系保持一致,但对于最极端的星系,系统地偏离。考虑到$WISE$的全天覆盖和W3波段作为SFR指标的性能,$L_{12μ\rm m}$ SFR关系对研究附近星系和即将进行的光学和无线电波长大面积调查可能非常有用。

英文摘要:

We present accurate resolved $WISE$ photometry of galaxies in the combined SINGS and KINGFISH sample. The luminosities in the W3 12$μ$m and W4 23$μ$m bands are calibrated to star formation rates (SFRs) derived using the total infrared luminosity, avoiding UV/optical uncertainties due to dust extinction corrections. The W3 relation has a 1-$σ$ scatter of 0.15 dex over nearly 5 orders of magnitude in SFR and 12$μ$m luminosity, and a range in host stellar mass from dwarf (10$^7$ M$_\odot$) to $\sim3\times$M$_\star$ (10$^{11.5}$ M$_\odot$) galaxies. In the absence of deep silicate absorption features and powerful active galactic nuclei, we expect this to be a reliable SFR indicator chiefly due to the broad nature of the W3 band. By contrast the W4 SFR relation shows more scatter (1-$σ=$ 0.18 dex). Both relations show reasonable agreement with radio continuum-derived SFRs and excellent accordance with so-called "hybrid" H$α+ 24 μ$m and FUV$+$24$μ$m indicators. Moreover, the $WISE$ SFR relations appear to be insensitive to the metallicity range in the sample. We also compare our results with IRAS-selected luminous infrared galaxies, showing that the $WISE$ relations maintain concordance, but systematically deviate for the most extreme galaxies. Given the all-sky coverage of $WISE$ and the performance of the W3 band as a SFR indicator, the $L_{12μ\rm m}$ SFR relation could be of great use to studies of nearby galaxies and forthcoming large area surveys at optical and radio wavelengths.

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。

↑