#TITLE_ALTERNATIVE#
The term of active galactic nuclei (AGN) is related to the compact region at the center of the galaxy which emits very bright radiation. Current standard cosmological model stated that large scale structure in our universe was formed hierarchically. Therefore, we should be able to observe a lot of g...
Saved in:
| Main Author: | |
|---|---|
| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/28129 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The term of active galactic nuclei (AGN) is related to the compact region at the center of the galaxy which emits very bright radiation. Current standard cosmological model stated that large scale structure in our universe was formed hierarchically. Therefore, we should be able to observe a lot of galaxy mergers event. However, the number of binary AGN, which is merging galaxy product, is still relatively small. Narrow line region (NLR) in AGN is a potential indicator to detect binary AGN at 0,1 – 10 kpc separation scale. At that distance, the narrow lines will be observed as double-peaked (dNL AGN) because there are two distinct NLR which orbits their own supermassive black hole. On the other hand, the double-peaked profile can also be produced by NLR dynamics such as outflow, rotation, and/or interaction with jet. <br />
<br />
In this thesis, we obtained 3252 dNL AGN from SDSS DR 13. We found that dNL AGN distribution in diagnostic diagram follows normal AGN. This indicates that there isn’t any fundamental difference which is related with energy generation mechanism between them. Furthermore, dNL AGN doesn’t show preference to certain galaxy morphology. In general, the redshift and luminosity distribution of dNL AGN are same with normal AGN, supporting the notion that they are not located at special space-time in our universe. The relation between 𝐿𝑟/𝐿𝑏 and 𝑉𝑟/𝑉𝑏 is not perfectly linear and there is significant dispersion which indicates that binary AGN population doesn’t dominate dNL AGN sample. Most of dNL AGN have enhanced star formation rate (SFR) if compared with non-AGN galaxy and type 1 AGN. This shows that there is a certain positive feedback mechanism between AGN activity with interstellar medium which leads to star formation. Follow up spectroscopic observation was conducted for NGC 4098 and SDSS J1544. Double-peaked profile in those galaxies SDSS spectra is caused by binary AGN existence. |
|---|