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Kash Farooq @kashfarooq
So, who wants to discuss the Demographics of Bulge Types within 11 Mpc and Implications for Galaxy Evolution? http://t.co/bpckjJG #astroJC
Prof. Karen Masters 💫⭐️✨ @KarenLMasters
Sitting in airport on way to #gal2011 could join #astroJC only haven't read paper. Will see if I can download.
astrojournalclub @astronomyjc
Hi everyone & welcome to the 5th meeting of #astrojc. We're discussing Demographics of local Bulge Types & Implications for Galaxy Evolution
astrojournalclub @astronomyjc
First, introductions: I'm Emma, a postdoc astronomer, mainly working on AGN evolution (& normally found @allinthegutter) #astrojc
Kash Farooq @kashfarooq
@_atjc So, are there an east of GMT people here? This meeting time is just for you! #astrojc
Arie Nouwen @AdrianusV
Yep, I'm here. Could only read summary. #astrojc
Kash Farooq @kashfarooq
@_atjc The gist of the paper is that current observations don't match the models. i.e. the models aren't working. Correct? #astrojc
Kash Farooq @kashfarooq
@_atjc Simulations produce more classical bulges than are observed. #astrojc
Arie Nouwen @AdrianusV
From the summary I C 3 classes: heavy galaxies > classic bulge, mediate galaxies > pseudobulge, small galaxies > no bulge. Correct? #astrojc
Arie Nouwen @AdrianusV
@kashfarooq maybe there are more mediate and light galaxies, which have no classical bulge. #astrojc
astrojournalclub @astronomyjc
@AdrianusV As I understand it, classical bulges form from mergers so they would tend to be in more massive galaxies #astrojc
astrojournalclub @astronomyjc
@AdrianusV Similarly, galaxies with classical bulges will be older as it's taken time to grow the bulge #astrojc
★ dr amanda bauer ★ @astropixie
@_atjc the implication is that there have way fewer mergers than models predict. assuming ps-bulges are not produced by mergers #astrojc
★ dr amanda bauer ★ @astropixie
@_atjc i'm interested in hierarchical vs "downsizing" issue #astrojc
astrojournalclub @astronomyjc
@astropixie 'Hierarchical' meaning galaxies grow in size through mergers; 'downsizing' meaning big things formed first? #astrojc
astrojournalclub @astronomyjc
If a galaxy goes from bulgeless to ps-bulge through internal evolution would this cause it to grow in size as well do you think? #astrojc
Kash Farooq @kashfarooq
@astropixie They say they have found fewer mergers because they have found fewer classical bulges? #astrojc
astrojournalclub @astronomyjc
@kashfarooq @astropixie It's more that galaxy formation models assume that all galaxies grow through mergers, so seeing many (1/2) #astrojc
astrojournalclub @astronomyjc
@kashfarooq @astropixie pseudobulges locally is odd, because the models don't predict them (2/2) #astrojc
Kash Farooq @kashfarooq
@astronomyjc They differentiate between ps-bulges and classical bulges by their Sérsic index. <2 = ps, >2 = classical. #astrojc
Arie Nouwen @AdrianusV
Does dark matter has influence on the formation of bulges? #astrojc
Kash Farooq @kashfarooq
@astronomyjc but...classical bulges can have Sérsic indices less than 2. So, some of their ps-bulges may be classical. #astrojc
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