Local Infrared Luminous Galaxies (LIRGs)

1. Local Infrared Luminous Galaxies (LIRGs) Xiaoyang Xia Tianjin Normal University Collaborating with Jianling Wang, Shude Mao, Zugan Deng, Hong. Wu

3. Motivation • The Morphology of LIRGs Wu et al. 1998, Arribas et al. 2004, Zheng et al. 2004, Melbourne et al. 2005 • Star Formation History Madau et al. 1998, Cowie et al. 1996 • Disk galaxy Formation

4. Is there evolution relation between LIRGs and ULIRGs? • A big fraction of higher-z LIRGs are disk galaxies (Zheng et al. 2004, Melbourne et al. 2005, Bell et al. 2005)

5. Motivation • The Morphology of LIRGs Wu et al. 1998, Arribas et al. 2004, Zheng et al. 2004, Melbourne et al. 2005 • Star Formation History Madau et al. 1998, Cowie et al. 1996 • Disk galaxy Formation

7. Le Floc'h et al. (2006, astro-ph/0506462)

8. Sample • From cross correlation of IRAS FSC with SDSS DR2 (Cao et al. 2006) • r<15.9 (Fukugita et al. 2004) • f(60)>0.3Jy

10. Results • The fractions of different morphologies • The stellar mass distribution of local LIRGs • The spectral properties of local LIRGs

11. Non-barred spiral

12. Barred spiral

13. Interacting

14. Merging

15. Compact

18. Results • The fractions of different morphologies • The stellar mass distribution of local LIRGs • The spectral properties of local LIRGs

22. Perez-Gonzalez, et al. (2005,astro-ph/0505101)

24. Reddy, et al. (2006, astro-ph/0602596)

25. Results • The fractions of different morphologies • The stellar mass distribution of local LIRGs • The spectral properties of local LIRGs

30. Marcillac et al. (2006)

31. BC03 BC03 BC03

36. Conclusion • The fractions of interacting and spirals are 48% and 40% for local LIRGs • ¾ of spirals of local LIRGs are stronly barred • Most local LIRGs are intermidiate mass galaxies • Local LIRGs have lower specific SFR, small cold gas fractions and narrow range of stellar mass

37. Thank You

38. Wang et al. (2006)

39. Wang et al. (2006)

40. Wang et al. (2006)

41. Marcillac et al. (2006)

42. Dressler et al. (1999)