The-10th-c-manga-workshop:abstracts

The 10th C-MaNGA workshop, Tsinghua, Dec 23-24, 2019

Abstract Submission

Provide the requested information if you are going to give a talk at the meeting. Please follow the same format as the example (keep the example on the top and don't delete it!).

Example

• Title: A summary of the MaNGA science projects at Tsinghua

Speaker: Cheng Li

Abstract: I will summarize the ongoing MaNGA projects at Tsinghua.

Please submit your abstract before Dec. 15, 2019.

Submitted Abstracts

• Title: Constraining inner density slopes with stellar kinematics

Speaker: Ran Li/Kai Zhu

Abstract: Recent progress in constraining the mass model of MaNGA galaxies with JAM.

• Title: The Impact of Merging on The Origin of Kinematically Misaligned and Counter-rotating Galaxies in MaNGA

Speaker: Songlin Li

Abstract: Galaxy mergers and interactions are expected to play a signicant role leading to offsets between gas and stellar motions in galaxies. Herein we crossmatch galaxies in MaNGA MPL-8 with the Dark Energy Spectroscopic Instrument (DESI) Legacy Surveys and identify 538 galaxies with merging/interacting features to investigate their position angle offsets (dPA) between gas and stellar rotation. We find that there is a much higher merging/interacting fraction in misaligned galaxies (30< dPA <150) than that in co-rotators (dPA < 30). This result corroborates that merging/interacting is one of the sources to produce misaligned galaxies and recent merging events can contribute to maximum 40% of such misalignment. Furthermore, the marginal merging/interacting fraction in star-forming (SF) counter-rotators (dPA >150) indicates the negligible role of merging in the origin of SF counter-rotators. In addition, the slightly smaller merging/interacting fraction in non star-forming (non-SF) counter-rotators (0.140) than that in non-SF misaligned galaxies (0.220) agrees with that counter-rotating is a stable state, where tidal features disappear. Finally, the ratio of co-rotators to counter-rotators in non-SF merging/interacting galaxies is about 8:1, much larger than the prediction from the isotropic merging (1:1), which supports the speculation that gas and stars prefer to be aligned during merging, as the orbital angular momentum transfers to gas and stellar spin.

• Title: Host Galaxy Properties of CL-AGNs]{Host Galaxy Properties of Changing-look AGN Revealed in the MaNGA Survey

Speaker: Xiaoling Yu

Abstract: Changing-look AGNs (CL-AGNs) are those AGN population whose broad Balmer emission lines appear or disappear within a few years. We use the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey to identify five CL-AGNs. The 2-D photometric and kinematic maps reveal common features as well as some unusual properties of CL-AGN hosts as compared to the AGN hosts in general. All MaNGA CL-AGNs reside in the star-forming main sequence with pseudo-bulges, similar to MaNGA non-CL-AGNs, and follow the $M_{BH}-\sigma_{*}$ relationship. The kinematic measurements indicate that they have similar distributions in the plane of angular momentum versus galaxy ellipticity. MaNGA CL-AGNs however show much higher (20\%) fraction of counter-rotating features compared to that (2\%) in general star-formation population. In addition, MaNGA CL-AGNs prefer face-on host galaxies with all axis ratio $>$ 0.7. Although low statistical significance, these results suggest that host galaxies could play a role in the CL-AGN phenomena.