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Feedback in the local universe: The Relation Between Star Formation and AGN Activity in elliptical galaxies

Feedback in the local universe: The Relation Between Star Formation and AGN Activity in elliptical galaxies. Sravani Vaddi 1 , Chris O’Dea 1 , Stefi Baum 1 , Christine Jones 2 , Bill Forman2, Samantha Whitmore 3 and Rabeea Ahmed 3 1 Astrophysical Sciences & Technology, RIT

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Feedback in the local universe: The Relation Between Star Formation and AGN Activity in elliptical galaxies

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  1. Feedback in the local universe:The Relation Between Star Formation and AGN Activity in elliptical galaxies Sravani Vaddi1, Chris O’Dea1, Stefi Baum1, Christine Jones2, Bill Forman2, Samantha Whitmore3 and Rabeea Ahmed3 1Astrophysical Sciences & Technology, RIT 2Harvard-Smithsonian Center for Astrophysics 3Harvard University Sravani Vaddi, RIT

  2. AGN - Active Galactic Nucleus • AGN - Class of galaxies showing energetic phenomena at the center of the galaxy. • Proposed by Hoyle and Fowler(1963). Fig: AGN Model Sravani Vaddi, RIT

  3. Multi-wavelength images of AGN INFRARED Hydra A galaxy Sravani Vaddi, RIT Centaurus A galaxy. Credit: X-ray: Chandra; Radio: VLA; Optical: ESO

  4. Motivation Observations BrightFaint Theory predicts large number of bright/massive galaxies. But observations indicate that there are very few bright galaxies. Some mysterious energy is preventing star formation. Theory Number density Galaxy brightness Fig: Galaxy Luminosity Function. Simply a distribution of galaxies Credit: Simon Driver Sravani Vaddi, RIT

  5. Possible solution – agn feedback • Jets from the AGN prevent cooling of the gas by pushing away the gas. • This reduces star formation. Hydra A. Credit: X-ray: Chandra Telescope; Radio: VLA; Optical: Canada-France-Hawaii-Telescope Sravani Vaddi, RIT

  6. The Project AGN feedback is observed in distant galaxies. THEN, • Is it still ongoing? • How powerful is AGN activity in the nearby galaxies? • How does it affect star formation in these galaxies if at all it does? Sravani Vaddi, RIT

  7. Result 1 – Radio power and galaxy mass relation Maximum radio power from the AGN is dependent on the mass of the galaxy. Massive galaxies are capable of hosting powerful radio sources. This is consistent with AGN feedback shaping the high mass end of galaxy LF. Sravani Vaddi, RIT

  8. Conclusion & Future work CONCLUSION • We notice that AGN feedback is ongoing in the local universe. • AGN activity is not very powerful and prominent in the nearby galaxies as compared to distant galaxies. • AGN activity does seem to influence star formation via feedback, BUT, it is not the only process involved in reducing star formation. FUTURE WORK • How much feedback is affecting star formation. What are the other processes? • Quantitative analysis for this work needs to be done such as calculating star formation rate, efficiency of accretion. SravaniVaddi, RIT

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