Astronomy Twitter Journal Club: Demographics of Bulge Types within 11 Mpc and Implications for Galaxy Evolution

Transcript from the fifth meeting of the Astronomy Twitter Journal Club. The paper under discussion can be found at http://arxiv.org/abs/1104.0020 and was suggested by @astropixie
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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

17/07/2011 15:33:28 WIB
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.

17/07/2011 16:41:09 WIB
astrojournalclub @astronomyjc

Hi everyone & welcome to the 5th meeting of #astrojc. We're discussing Demographics of local Bulge Types & Implications for Galaxy Evolution

17/07/2011 17:00:10 WIB
astrojournalclub @astronomyjc

First, introductions: I'm Emma, a postdoc astronomer, mainly working on AGN evolution (& normally found @allinthegutter) #astrojc

17/07/2011 17:00:54 WIB
Kash Farooq @kashfarooq

@_atjc So, are there an east of GMT people here? This meeting time is just for you! #astrojc

17/07/2011 17:01:57 WIB
Arie Nouwen @AdrianusV

Yep, I'm here. Could only read summary. #astrojc

17/07/2011 17:07:44 WIB
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

17/07/2011 17:08:07 WIB
Kash Farooq @kashfarooq

@_atjc Simulations produce more classical bulges than are observed. #astrojc

17/07/2011 17:10:43 WIB
Arie Nouwen @AdrianusV

From the summary I C 3 classes: heavy galaxies > classic bulge, mediate galaxies > pseudobulge, small galaxies > no bulge. Correct? #astrojc

17/07/2011 17:12:22 WIB
Arie Nouwen @AdrianusV

@kashfarooq maybe there are more mediate and light galaxies, which have no classical bulge. #astrojc

17/07/2011 17:14:06 WIB
astrojournalclub @astronomyjc

@AdrianusV As I understand it, classical bulges form from mergers so they would tend to be in more massive galaxies #astrojc

17/07/2011 17:15:11 WIB
astrojournalclub @astronomyjc

@AdrianusV Similarly, galaxies with classical bulges will be older as it's taken time to grow the bulge #astrojc

17/07/2011 17:16:28 WIB
★ 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

17/07/2011 17:16:31 WIB
★ dr amanda bauer ★ @astropixie

@_atjc i'm interested in hierarchical vs "downsizing" issue #astrojc

17/07/2011 17:17:18 WIB
astrojournalclub @astronomyjc

@astropixie 'Hierarchical' meaning galaxies grow in size through mergers; 'downsizing' meaning big things formed first? #astrojc

17/07/2011 17:18:24 WIB
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

17/07/2011 17:19:50 WIB
Kash Farooq @kashfarooq

@astropixie They say they have found fewer mergers because they have found fewer classical bulges? #astrojc

17/07/2011 17:20:42 WIB
astrojournalclub @astronomyjc

@kashfarooq @astropixie It's more that galaxy formation models assume that all galaxies grow through mergers, so seeing many (1/2) #astrojc

17/07/2011 17:23:30 WIB
astrojournalclub @astronomyjc

@kashfarooq @astropixie pseudobulges locally is odd, because the models don't predict them (2/2) #astrojc

17/07/2011 17:24:14 WIB
Kash Farooq @kashfarooq

@astronomyjc They differentiate between ps-bulges and classical bulges by their Sérsic index. <2 = ps, >2 = classical. #astrojc

17/07/2011 17:24:49 WIB
Arie Nouwen @AdrianusV

Does dark matter has influence on the formation of bulges? #astrojc

17/07/2011 17:25:24 WIB
Kash Farooq @kashfarooq

@astronomyjc but...classical bulges can have Sérsic indices less than 2. So, some of their ps-bulges may be classical. #astrojc

17/07/2011 17:25:24 WIB
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