التفاصيل البيبلوغرافية
| العنوان: |
The NGC 4013 tale: a pseudo-bulged, late-type spiral shaped by a major merger. |
| المؤلفون: |
Jianling Wang1,2 wjianl@bao.ac.cn, Hammer, Francois3 francois.hammer@obspm.fr, Puech, Mathieu3, Yanbin Yang3, Flores, Hector3 |
| المصدر: |
Monthly Notices of the Royal Astronomical Society. 10/1/2015, Vol. 452 Issue 4, p3551-3560. 10p. |
| مصطلحات موضوعية: |
*STELLAR luminosity function, *STAR formation, *ASTRONOMICAL models, *GALACTIC halos, *GAS air conditioning, *GALACTIC evolution |
| مستخلص: |
Many spiral galaxy haloes show stellar streams with various morphologies when observed with deep images. The origin of these tidal features is discussed, either coming from a satellite infall or caused by residuals of an ancient, gas-rich major merger. By modelling the formation of the peculiar features observed in the NGC 4013 halo, we investigate their origin. By using GADGET-2 with implemented gas cooling, star formation, and feedback, we have modelled the overall NGC 4013 galaxy and its associated halo features. A gas-rich major merger occurring 2.7-4.6 Gyr ago succeeds in reproducing the NGC 4013 galaxy properties, including all the faint stellar features, strong gas warp, boxy-shaped halo and vertical 3.6μm luminosity distribution. High gas fractions in the progenitors are sufficient to reproduce the observed thin and thick discs, with a small bulge fraction, as observed. A major merger is able to reproduce the overall NGC 4013 system, including the warp strength, the red colour and the high stellar mass density of the loop, while a minor merger model cannot. Because the gas-rich model suffices to create a pseudo-bulge with a small fraction of the light, NGC 4013 is perhaps the archetype of a late-type galaxy formed by a relatively recent merger. Then late type, pseudo-bulge spirals are not mandatorily made through secular evolution, and the NGC 4013 properties also illustrate that strong warps in isolated galaxies may well occur at a late phase of a gas-rich major merger. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
Full Text Finder