Far-Infrared and submillimeter properties of SDSS galaxies in the Herschel ATLAS science demonstration phase field  

作　　者：Man I Lam Hong Wu Yi-Nan Zhu Zhi-Min Zhou 

机构地区：[1]National Astronomical Observatories,Chinese Academy of Science [2]Graduate University of Chinese Academy of Sciences [3]Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2013年第2期179-196,共18页天文和天体物理学研究（英文版）

基　　金：supported by the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences;supported by the National Natural Science Foundation of China (Grant Nos. 11173030,10833006,10773014 and 11078017);partly supported by the China Ministry of Science and Technology under State Key Development Program for Basic Research (2012CB821800)

摘　　要：Using the Herschel ATLAS science demonstration phase data cross- identified with SDSS DR7 spectra, we select 297 galaxies with F250μm 〉 5σ. The sample galaxies are classified into five morphological types, and more than 40% of the galaxies are peculiar/compact galaxies. The peculiar galaxies show higher far- infrared/submillimeter luminosity-to-mass ratios than the other types. We perform and analyze the correlations of far-infrared/submillimeter and Hα luminosities for differ- ent morphological types and different spectral types. The Spearman rank coefficient decreases and the scatter increases with the wavelength increasing from 100 μm to 500 μm. We conclude that a single Herschel SPIRE band is not good for tracing star formation activities in galaxies. AGNs contribute less to the far-infrared/submillimeter luminosities and do not show a difference from star-forming galaxies. However, the earlier type galaxies present significant deviations from the best fit of star-forming galaxies.Using the Herschel ATLAS science demonstration phase data cross- identified with SDSS DR7 spectra, we select 297 galaxies with F250μm 〉 5σ. The sample galaxies are classified into five morphological types, and more than 40% of the galaxies are peculiar/compact galaxies. The peculiar galaxies show higher far- infrared/submillimeter luminosity-to-mass ratios than the other types. We perform and analyze the correlations of far-infrared/submillimeter and Hα luminosities for differ- ent morphological types and different spectral types. The Spearman rank coefficient decreases and the scatter increases with the wavelength increasing from 100 μm to 500 μm. We conclude that a single Herschel SPIRE band is not good for tracing star formation activities in galaxies. AGNs contribute less to the far-infrared/submillimeter luminosities and do not show a difference from star-forming galaxies. However, the earlier type galaxies present significant deviations from the best fit of star-forming galaxies.

关 键 词：galaxies： formation -- galaxies statistics -- galaxies structure -- in-frared： galaxies 

分 类 号：P152[天文地球—天文学]