| The conformity of HI galaxies in ALFALFA-SDSS sample |
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| 作者姓名： | Lin-Cheng Li Bo Qin Jie Wang Jing Wang You-Gang Wang |
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| 作者单位： | National Astronomical Observatories;School of Astronomy and Space Science;International Centre for Radio Astronomy Research（ICRAR）;Department of Astronomy |
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| 基金项目： | funded by the National Key R&D Program of China(Grant No.2018YFA0404603);supported by CAS Interdisciplinary Innovation Team(JCTD-2019-05)。 |
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| 摘 要： | The conformity effect,indicating the evolution of galaxies is related to its surrounding neighbor galaxies as far as a few Mpc,is an interesting phenomenon in the modeling of galaxy and evolution.Here we study the conformity effect of HI galaxies in a matched galaxy sample between SDSS DR7 and ALFALFA surveys.By checking the probability difference for the detected H i galaxies as a function of distance around a normal or an H i galaxy,we find that this effect is significant out to 5 Mpc.It also shows a dependence on the stellar mass of galaxies,with the strength the strongest in the stellar mass range of 1010*/M⊙<1010.5.However,when the sample is confined to central galaxies in groups with virial radii smaller than 1 Mpc,the 1-halo conformity signal is still evident,while the 2-halo conformity signal is reduced to a very weak amplitude.Our results confirm the previous study in the optical band that the 2-halo term is possibly caused by the bias effect in the sample selection.Furthermore,we confirm the existence of the 1-halo conformity discovered in the optical and radio band in previous investigations.Our results provide another viewpoint on the conformity effect and hope to shed light on the co-evolution of the galaxies and their neighbors in the current galaxy formation models.
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| 关 键 词： | method data analysis-radio lines galaxies-galaxies evolution |
The conformity of HI galaxies in ALFALFA-SDSS sample |
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| Lin-Cheng Li,Bo Qin,Jie Wang,Jing Wang,You-Gang Wang.The conformity of HI galaxies in ALFALFA-SDSS sample[J].Research in Astronomy and Astrophysics,2021(2). |
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