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arXiv 0802.3723astro-ph
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Spitzer多波段成像光度计的绝对校准和表征:IV。光谱能量分布模式

Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer: IV. The Spectral Energy Distribution Mode

N. Lu, P. S. Smith, C. W. Engelbracht, A. Noriega-Crespo, J. Morrison, K. D. Gordon, J. Stansberry, F. R. Marleau, G. H. Rieke, R. Paladini, D. L. Padgett, J. K… 展开作者

N. Lu, P. S. Smith, C. W. Engelbracht, A. Noriega-Crespo, J. Morrison, K. D. Gordon, J. Stansberry, F. R. Marleau, G. H. Rieke, R. Paladini, D. L. Padgett, J. Keene, W. B. Latter, D. Fadda, J. Rho

摘要:

Spitzer空间望远镜多波段成像光度计(MIPS)的光谱能量分布(SED)模式采用MIPS 70 μ m探测器提供远红外低光谱分辨率(R ~ 15-25)光谱学。反射光栅提供每像素1.7 μ m的色散,以及在检测器行1-27上52.8- 98.7 μ m的有效波长覆盖。最后5个检测器行被二阶衍射光污染,并且未被校准。流量刻度是根据70 μ m流量密度为0.5- 15 Jy的MIPS刻度星的观测结果进行的。点源通量校准精度估计为10%或更好的下降到约0.5焦耳在光谱的蓝端和2焦耳附近的红端。加上照明和孔径校正的额外不确定性,扩展光源的表面亮度校准精度可达~ 15%。通过对几颗定标星的多次测量,发现SED模式的重复性优于5%。

英文摘要:

The Spectral Energy Distribution (SED) mode of the Multiband Imaging Photometer for Spitzer (MIPS) Space Telescope provides low-spectral resolution (R ~ 15-25) spectroscopy in the far infrared using the MIPS 70 um detector. A reflective grating provides a dispersion of 1.7 um per pixel, and an effective wavelength coverage of 52.8--98.7 um over detector rows 1-27. The final 5 detector rows are contaminated by second-order diffracted light and are left uncalibrated. The flux calibration is based on observations of MIPS calibration stars with 70 um flux densities of 0.5--15 Jy. The point-source flux calibration accuracy is estimated to be 10% or better down to about 0.5 Jy at the blue end of the spectrum and to 2 Jy near the red end. With additional uncertainties from the illumination and aperture corrections included, the surface brightness calibration of extended sources is accurate to ~15%. Repeatability of better than 5% is found for the SED mode through multiple measurements of several calibration stars.

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