The Calibration of Monochromatic Far-Infrared Star Formation Rate Indicators
D. Calzetti, S. -Y. Wu, S. Hong, R. C. Kennicutt, J. C. Lee, D. A. Dale, C. W. Engelbracht, L. van Zee, B. T. Draine, C. -N. Hao, K. D. Gordon, J. Moustakas, E.… 展开作者
D. Calzetti, S. -Y. Wu, S. Hong, R. C. Kennicutt, J. C. Lee, D. A. Dale, C. W. Engelbracht, L. van Zee, B. T. Draine, C. -N. Hao, K. D. Gordon, J. Moustakas, E. J. Murphy, M. Regan, A. Begum, M. Block, J. Dalcanton, J. Funes, A. Gil de Paz, B. Johnson, S. Sakai, E. Skillman, F. Walter, D. Weisz, B. Williams, Y. Wu
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69 pages, 19 figures, 2 tables; accepted for publication on ApJ
(Abridged) Spitzer data at 24, 70, and 160 micron and ground-based H-alpha images are analyzed for a sample of 189 nearby star-forming and starburst galaxies to investigate whether reliable star formation rate (SFR) indicators can be defined using the monochromatic infrared dust emission centered at 70 and 160 micron. We compare recently published recipes for SFR measures using combinations of the 24 micron and observed H-alpha luminosities with those using 24 micron luminosity alone. From these comparisons, we derive a reference SFR indicator for use in our analysis. Linear correlations between SFR and the 70 and 160 micron luminosity are found for L(70)>=1.4x10^{42} erg/s and L(160)>=2x10^{42} erg/s, corresponding to SFR>=0.1-0.3 M_sun/yr. Below those two luminosity limits, the relation between SFR and 70 micron (160 micron) luminosity is non-linear and SFR calibrations become problematic. The dispersion of the data around the mean trend increases for increasing wavelength, becoming about 25% (factor ~2) larger at 70 (160) micron than at 24 micron. The increasing dispersion is likely an effect of the increasing contribution to the infrared emission of dust heated by stellar populations not associated with the current star formation. The non-linear relation between SFR and the 70 and 160 micron emission at faint galaxy luminosities suggests that the increasing transparency of the interstellar medium, decreasing effective dust temperature, and decreasing filling factor of star forming regions across the galaxy become important factors for decreasing luminosity. The SFR calibrations are provided for galaxies with oxygen abundance 12+Log(O/H)>8.1. At lower metallicity the infrared luminosity no longer reliably traces the SFR because galaxies are less dusty and more transparent.
On the Reliability of Quasars as Cosmological Distance Indicators
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (Cinvestav)（墨西哥国立理工学院高级研究中心）；Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México（墨西哥国立自治大学物理科学研究所）；Facultad de Ciencias, Universidad Nacional Autónoma de México（墨西哥国立自治大学理学院）；Colegio de Ciencias y Humanidades Plantel Sur, Universidad Nacional Autónoma de México（墨西哥国立自治大学人文科学学院南校区）
Skipping the rungs! Calibrating distance indicators through their clustering with galaxies
The University of Queensland（昆士兰大学）；Swinburne University of Technology（斯威本科技大学）；OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery（OzGrav：引力波发现ARC卓越中心）
