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Wednesday 20 July 2022, 13:00

WEBINAR

Star Formation Quenching in L* Ellipticals

Suraj Dhiwar
Inter-University Centre for Astronomy and Astrophysics, Pune, India

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Seminars / Webinars

UPCOMING WEΒINAR

Wednesday 20 July 2022, 13:00 (EET)

Star Formation Quenching in L* Ellipticals

Suraj Dhiwar
Inter-University Centre for Astronomy and Astrophysics, Pune, India

Abstract:

In this talk, I will present our study on star formation quenching in L* ellipticals. We have studied the evolution of L* elliptical galaxies in the color-magnitude diagram in terms of their star-formation history and environment in an attempt to learn about their quenching process. For this, from a parent sample of 36500 galaxies that were spectroscopically selected from Stripe82 of the Sloan Digital Sky Survey, we have selected a sample of 12 blue-cloud L* ellipticals (BLE), 11 green-valley L* ellipticals (GLE), and 28 red-sequence L* ellipticals (RLE) based on visual inspection and their surface-brightness profiles. Our analysis shows that most of the RLEs and GLEs are quenched only recently or are still forming stars, based on their [OIII] and Hα emission, while the BLEs are forming stars vigorously. Further, the star-formation in BLEs is found to be extended over the galaxy and not confined to their central region. The galaxy color correlates with the cosmic-web environment, with the BLEs tending to reside in lower-density regions, the RLEs preferring denser, clustered regions, and the GLEs found in either region. I will discuss the possible scenarios that cause this migration of the star-forming ellipticals towards the red sequence.

I will also give a short introduction of my ongoing projects on emission line mapping and UV morphology of intermediate redshift star-forming galaxies, and Lyman Continuum (LyC) emitters at redshift 1.0 < z < 2.0, which is being carried out using the deep imaging data from Ultra-Violet Imaging Telescope (UVIT) on board Astrosat.

 


Past webinar recordings are available here

 

Past Webinars

Date Speaker Title
18 Jul 2022 Samik Mitra
Prime Minister's Research Scholar, Department of Physics, IIT Guwahati, India
Properties of general relativistic magneto-hydrodynamics accretion flows around black holes in steady-state limit (Watch here)
12 Jul 2022 Christos Efthymiopoulos
University of Padova, Department of Mathematics
The information approach to the interpretation of quantum mechanics (Watch here)
5 Jul 2022 Kanak Saha
Inter-University Centre for Astronomy and Astrophysics, Pune, India
Growth and survival of bars in disk galaxies (Watch here)
28 Jun 2022 Georgios Loukes-Gerakopoulos
Astronomical Institute of the CAS, Czech Republic
Celestial Mechanics of Extreme Mass Ratio Inspirals (Watch here)
14 Jun 2022 Matthaios Katsanikas
Research Center for Astronomy and Applied Mathematics, Academy of Athens
Stickiness in 3D rotating galactic potentials (Watch here)
9 Jun 2022 Makrina Agaoglou
Instituto de Ciencias Matematicas, Madrid, Spain
Transport processes on a Potential Energy Surface with four wells, four index-1 saddles and an index-2 saddle (Watch here)
24 May 2022 Susanna Parenti
Institut d'Astrophysique Spatiale, France
Validation of a wave heated 3D MHD coronal-wind model using Polarized Brightness and EUV observations (Watch here)
17 May 2022 Konstantina Zouloumi
Research Center for Astronomy & Applied Mathematics & Department of Astrophysics, Astronomy and Mechanics, University of Athens
NAAF determination of the multiple pattern speeds and the manifolds in a simulation of a barred spiral galaxy (Watch here)
3 May 2022 Antonios Tsokaros
University of Illinois at Urbana-Champaign, USA
Numerical general relativity and astrophysics in the era of multimessenger astronomy (Watch here)
18 Apr 2022 Stavros Pastras
Research Center for Astronomy and Applied Mathematics, Academy of Athens
& Department of Physics, Section of Astrophysics, Astronomy and Mechanics, University of Athens
Gasflows in barred spiral galaxies by means of two different hydrocodes (Watch here)
12 Apr 2022 Spyridon Aleiferis
UK Atomic Energy Authority, Culham Science Centre, Abingdon, UK
Taming of the stars: how to control fusion plasmas (Watch here)
31 Mar 2022 Evangelos Melas
University of Athens, Department of Economics
Asymptotic symmetries and representation theory in General Relativity in three and four space-time dimensions (Watch here)
29 Mar 2022 Georgios Doulis
Institute of Theoretical Physics, University of Jena, Germany
Entropy as shock indicator in neutron star merger simulations (Watch here)
15 Mar 2022 Dimitris Stamatellos
Jeremiah Horrocks Institute for Mathematics, Physics & Astronomy, University of Central Lancashire, Preston, UK
The formation and evolution of disc-instability planets (Watch here)
10 Mar 2022 Damianos Iosifidis
Aristotle University of Thessaloniki
Perfect Hyperfluids (Watch here)
8 Mar 2022 Antonios Nathanail
University of Athens, Department of Physics
Still observing light from the binary neutron star merger first detected in 2017 (Watch here)
3 Mar 2022 Karnesis Nikolaos
Aristotle University of Thessaloniki, School of Physics
Detecting Gravitational Waves from space (Watch here)
22 Feb 2022 Athanasios C. Tzemos
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Chaos and Bohmian Quantum Potential (Watch here)
15 Feb 2022 Ioannis Contopoulos
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Quantum Interference: reality or an illusion of the detector? (Watch here)
8 Feb 2022 Charis Anastopoulos
Department of Physics, University of Patras
Gravitational effects in macroscopic quantum systems (Watch here)
1 Feb 2022 Konstantinos N. Gourgouliatos
Department of Physics, University of Patras
Magnetic Field Evolution in Neutron Star Crusts: Hall effect and beyond ( Watch here)
18 Jan 2022 Athanasios C. Tzemos
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Born's rule in the case of 3 entangled Bohmian qubits (Watch here)
11 Jan 2022 Constantinos Kalapotharakos
University of Maryland and Astrophysics Science Division, NASA/Goddard Space Flight Center, USA
Interpreting the Thermal and Non-Thermal High-Energy Emission in Multipolar Field Pulsar Magnetospheres (Watch here)
14 Dec 2021 Thorsten Naab
Max-Planck-Institute for Astrophysics, Garching, Germany
The GRIFFIN project - towards realistic simulations of galactic star cluster populations (Watch here)
7 Dec 2021 Ivan Minchev
Leibniz-Institut für Astrophysik Potsdam (AIP)
Modeling the Galactic disk in the age of Gaia (Watch here)
30 Nov 2021 Edoardo Legnaro
Research Center for Astronomy and Applied Mathematics of the Academy of Athens and University of Thessaloniki
Analytic Theory for Secular Lunisolar Resonances (Watch here)
9 Nov 2021 Dimitri A. Gadotti
ESO – European Southern Observatory
Nuclear discs in external galaxies and the Milky Way: building "bulges" without mergers (Watch here)
26 Oct 2021 Demosthenes Kazanas
NASA Goddard Space Flight Center, Corresponding Member of the Academy of Athens
Gravity beyond Einstein? Yes, but in which direction? (Watch here)
13 Jul 2021 Dimitris Christodoulou
University of Massachusetts
Major-Body Clustering in the Solar System (Watch here)
24 Jun 2021 Panos A. Patsis
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Building blocks of 3D, X-shaped bulges and thick spirals
(Watch here)
8 Jun 2021 George Contopoulos
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Μια συνοπτική έκθεση της Φιλοσοφίας της Φυσικής και των Μαθηματικών
(Διαθέσιμη μαγνητοσκοπημένη)
1 Jun 2021 Christos Efthymiopoulos
Department of Mathematics Tullio Levi-Civita, University of Padua
(Work in collaboration with Rita Mastroianni)
Secular dynamics for exoplanetary systems with two planets in mutually inclined orbits
(Watch here)
13 May 2021 Athanasios C. Tzemos
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Born's Rule in the case of two entangled Bohmian qubits
(Watch here)
22 Apr 2021 Costis Gontikakis
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Study of the emission measure during a solar flare observed with IRIS spectrograph (Watch here)

Seminars in 2020

Date Speaker Title
3 Mar 2020 Anastasios Anastasiadis
National Observatory of Athens / IAASARS
Unveiling Current Challenges in Space Weather Forecasting: The SAWS-ASPECS tool
25 Feb 2020 Vasileios Basios
Université Libre de Bruxelles, Interdisciplinary Centre for Nonlinear Phenomena & Complex Systems (Cenoli-ULB) & Département de Physique des Systèmes Complexes et Mécanique Statistique
Labyrinth Chaos: Conservative, non-Hamiltonian Chaos without Attractors
18 Feb 2020 Elias Koulouridis
National Observatory of Athens / IAASARS
Tracing the Universe: X-ray surveys and cosmology
11 Feb 2020 Costis Gontikakis
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Moss, the trace of hot loops in EUV, an ongoing research
28 Jan 2020 Athanassios C. Tzemos
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Chaos and ergodicity in the trajectories of two entangled Bohmian qubits
21 Jan 2020 George Dimopoulos
National Observatory of Athens
Coronal properties of Sy I Active Galaxies
14 Jan 2020 Panos A. Patsis
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Some open issues in Galactic Dynamics and the contribution of Image Processing in resolving them

A list of all previous seminars from 2008 to 2020 is available here.

Seminars List booklet

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