arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.4150astro-ph
收藏

用红外线探测器测定恒星形成率

Determining Star Formation Rates for Infrared Galaxies

G. H. Rieke, A. Alonso-Herrero, B. J. Weiner, P. G. Perez-Gonzalez, M. Blaylock, J. L. Donley, D. Marcillac, .

摘要:

研究表明,在总红外光度= L(TIR)~10^10 L_sun范围内,用单波段24 μ m光度和经消光校正的帕邢α光度测量红外星系的恒星形成率(SFR)是一致的。MIPS 24微米测光可以从这个光度以上准确地得出恒星形成率:SFR(M_sun/yr)= 7.8 x 10 ^-10 L(24 um,L_sun)从L(TIR)= 5 x 10^9 L_sun到10^11 L_sun,对于更高的L(TIR),SFR = 7.8 x 10 ^-10 L(24 um,L_sun)x(7.76 x 10 ^-11 L(24))^0.048。对于L(TIR)>= 10^10 L_sun的星系,这些新的表达式应该提供0.2 dex以内的SFR。当L(TIR)>= 10^11 L_sun时,我们发现,使用折射率校正的Pa-α(可能使用任何其他光学或近红外复合线),红外星系的SFR被显著低估。作为这项工作的一部分,我们构建了光谱能量分布(SED)模板的11个发光和超明亮的纯恒星形成红外星系(LIRGs和ULIRGs)和光谱范围为0.4微米至30厘米。我们使用这些模板和SINGS数据构建了L(TIR)= 5 x 10^9至10^13 L_sun的红外星系的平均模板,范围从5微米到30厘米。所有这些模板都可以在线获得。

英文摘要:

We show that measures of star formation rates (SFRs) for infrared galaxies using either single-band 24 um or extinction-corrected Paschen-alpha luminosities are consistent in the total infrared luminosity = L(TIR) ~ 10^10 L_sun range. MIPS 24 micron photometry can yield star formation rates accurately from this luminosity upward: SFR(M_sun/yr) = 7.8 x 10^-10 L(24 um, L_sun) from L(TIR) = 5 x 10^9 L_sun to 10^11 L_sun, and SFR = 7.8 x 10^-10 L(24 um, L_sun) x (7.76 x 10^-11 L(24))^0.048 for higher L(TIR). For galaxies with L(TIR) >= 10^10 L_sun, these new expressions should provide SFRs to within 0.2 dex. For L(TIR) >= 10^11 L_sun, we find that the SFR of infrared galaxies is significantly underestimated using extinction-corrected Pa-alpha (and presumably using any other optical or near infrared recombination lines). As a part of this work, we constructed spectral energy distribution (SED) templates for eleven luminous and ultraluminous purely star forming infrared galaxies (LIRGs and ULIRGs) and over the spectral range 0.4 microns to 30 cm. We use these templates and the SINGS data to construct average templates from 5 microns to 30 cm for infrared galaxies with L(TIR) = 5 x 10^9 to 10^13 L_sun. All of these templates are made available on line.

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。

↑