scholarly journals The role of black holes in galaxy formation and evolution

Nature ◽  
2009 ◽  
Vol 460 (7252) ◽  
pp. 213-219 ◽  
Author(s):  
A. Cattaneo ◽  
S. M. Faber ◽  
J. Binney ◽  
A. Dekel ◽  
J. Kormendy ◽  
...  
Keyword(s):  
Black Holes ◽  
Galaxy Formation ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution

scholarly journals The Role of Radio Loud Phase of Nuclear Activity in Galaxy Formation and Evolution

2013 ◽  
Vol 9 (S304) ◽  
pp. 419-420
Author(s):  
Gabriel A. Ohanian
Keyword(s):  
Galaxy Formation ◽  
Subsequent Development ◽  
Nuclear Activity ◽  
Evolution Of Galaxies ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
Key Questions

AbstractKey questions, which arise when one tries to clear up a problem of formation and evolution of galaxies, is the question of energy: what is the energetic budget of AGN owing to form galaxies and provide its subsequent development? Hence, for understanding the formation and evolution of galaxies, it is important to estimate the energetic budget of AGN which we try to do involving radio loud phase of nuclear activity.

scholarly journals JETS AND OUTFLOWS IN RADIO GALAXIES: IMPLICATIONS FOR AGN FEEDBACK

2012 ◽  
Vol 08 ◽  
pp. 396-399 ◽  
Author(s):  
ELEONORA TORRESI ◽  
PAOLA GRANDI ◽  
ELISA COSTANTINI ◽  
GIORGIO G. C. PALUMBO
Keyword(s):  
Black Holes ◽  
Galaxy Formation ◽  
Surrounding Medium ◽  
Radio Galaxies ◽  
Broad Line ◽  
Jets And Outflows ◽  
Massive Black Holes ◽  
X Ray ◽  
Formation And Evolution

One of the main debated astrophysical problems is the role of the AGN feedback in galaxy formation. It is known that massive black holes have a profound effect on the formation and evolution of galaxies, but how black holes and galaxies communicate is still an unsolved problem. For Radio Galaxies, feedback studies have mainly focused on jet/cavity systems in the most massive and X–ray luminous galaxy clusters. The recent high–resolution detection of warm absorbers in some Broad Line Radio Galaxies allow us to investigate the interplay between the nuclear engine and the surrounding medium from a different perspective. We report on the detection of warm absorbers in two Broad Line Radio Galaxies, 3C 382 and 3C 390.3, and discuss the physical and energetic properties of the absorbing gas. Finally, we attempt a comparison between radio–loud and radio–quiet outflows.

Supermassive black holes

2018 ◽  
Author(s):  
Michele Maggiore
Keyword(s):  
Black Holes ◽  
Gravitational Waves ◽  
Galaxy Formation ◽  
The Self ◽  
Mass Ratio ◽  
Pulsar Timing ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
Stochastic Backgrounds ◽  
Self Force

The supermassive BH at the center of our Galaxy. Formation and evolution of SMBH binaries. Perspective for detection with LISA. Extreme mass ratio inspirals (EMRIs). Computation of the EMRI’s waveform with the self-force approach. Stochastic backgrounds of gravitational waves produced by SMBH binaries. Perspective for detection at pulsar timing arrays

scholarly journals Dusty Starbursts within a z=3 Large Scale Structure revealed by ALMA

2015 ◽  
Vol 11 (S319) ◽  
pp. 109-109
Author(s):  
Hideki Umehata
Keyword(s):  
Galaxy Formation ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Massive Black Hole ◽  
Rich Cluster ◽  
Galaxy Formation And Evolution ◽  
Submillimeter Galaxies ◽  
Formation And Evolution

AbstractThe role of the large-scale structure is one of the most important theme in studying galaxy formation and evolution. However, it has been still mystery especially at z>2. On the basis of our ALMA 1.1 mm observations in a z ~ 3 protocluster field, it is suggested that submillimeter galaxies (SMGs) preferentially reside in the densest environment at z ~ 3. Furthermore we find a rich cluster of AGN-host SMGs at the core of the protocluster, combining with Chandra X-ray data. Our results indicate the vigorous star-formation and accelerated super massive black hole (SMBH) growth in the node of the cosmic web.

scholarly journals Tracing the relation between black holes and dark haloes

2004 ◽  
Vol 220 ◽  
pp. 317-318
Author(s):  
Pieter Buyle ◽  
Maarten Baes ◽  
Herwig Dejonghe
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Galaxy Formation ◽  
Velocity Dispersion ◽  
Spiral Galaxies ◽  
Circular Velocity ◽  
Supermassive Black Hole ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
Fisher Relation

We present new velocity dispersion measurements for a set of 12 spiral galaxies and use them to derive a more accurate υc – σ relation which holds for a wide morphological range of galaxies. Combined with the MBH – σ relation, this relation can be used as a tool to estimate supermassive black hole (SMBH) masses by means of the asymptotic circular velocity. Together with the Tully-Fisher relation, it serves as a constraint for galaxy formation and evolution models.

scholarly journals Properties of green valley galaxies in relation to their selection criteria

2019 ◽  
Vol 15 (S356) ◽  
pp. 152-157
Author(s):  
Beatrice Nyiransengiyumva ◽  
Mirjana Pović ◽  
Pheneas Nkundabakura ◽  
Antoine Mahoro
Keyword(s):  
Galaxy Formation ◽  
Selection Criteria ◽  
Morphological Properties ◽  
Morphological Transformation ◽  
Open Questions ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
The Difference ◽  
Stellar Masses

AbstractThe distribution of galaxies has been studied to show the difference between the blue cloud and red sequence and to define the green valley region. However, there are still many open questions regarding the importance of the green valley for understanding the morphological transformation and evolution of galaxies, how galaxies change from late-type to early-type and the role of AGN in galaxy formation and evolution scenario. The work focused on studying in more details the properties of green valley galaxies by testing the six most used selection criteria, differences between them, and how they may affect the main results and conclusions. The main findings are that, by selecting the green valley galaxies using different criteria, we are selecting different types of galaxies in terms of their stellar masses, sSFR, SFR, spectroscopic classification and morphological properties, where the difference was more significant for colour criteria than for sSFR and SFR vs. M* criteria.

scholarly journals A SAURON view of double-barred galaxies

2009 ◽  
Vol 5 (S262) ◽  
pp. 323-324
Author(s):  
Adriana de Lorenzo-Cáceres ◽  
Alexandre Vazdekis ◽  
Jesús Falcón-Barroso ◽  
Inma Martínez-Valpuesta
Keyword(s):  
Galaxy Formation ◽  
Spectroscopic Data ◽  
Stellar Population ◽  
Population Analysis ◽  
Barred Galaxies ◽  
Galaxy Formation And Evolution ◽  
The Galaxy ◽  
Central Regions ◽  
Formation And Evolution

Double bars might be the key mechanisms to transport gas to the very central regions of galaxies, so double-barred galaxies are key objects to better understand the galaxy formation and evolution scenarios. In order to disentangle the role of double bars in the galaxy build up, we are performing a whole kinematical and stellar population analysis of these objects from high S/N spectroscopic data.

scholarly journals The formation of brightest cluster galaxies: the case of ABELL 407

2015 ◽  
Vol 48 (1) ◽  
Author(s):  
Louise O.V. Edwards
Keyword(s):  
Galaxy Formation ◽  
Cluster Galaxy ◽  
Cluster Galaxies ◽  
Brightest Cluster Galaxies ◽  
Galaxy Formation And Evolution ◽  
The Galaxy ◽  
Formation And Evolution ◽  
Intracluster Light

This article begins with a general introduction to galaxy formation and evolution and ends with a discussion of the long-term spectroscopic study: The Role of Close Companions in the Formation of Brightest Cluster Galaxies and Intracluster Light. To illustrate the power, goals and aims of this larger project, preliminary data for one of the galaxy clusters in our sample is presented, Abell 407, which appears to be caught in the act of forming its Brightest Cluster Galaxy (BCG).

scholarly journals A New Catalog of Isolated Galaxies

2009 ◽  
Vol 5 (S267) ◽  
pp. 464-464
Author(s):  
J. A. Vázquez-Mata ◽  
H. M. Hernández-Toledo ◽  
Changbom Park ◽  
Yun-Young Choi
Keyword(s):  
Galaxy Formation ◽  
Environmental Effects ◽  
Comparative Studies ◽  
Sloan Digital Sky Survey ◽  
Selection Algorithm ◽  
Isolated Galaxies ◽  
Galaxy Formation And Evolution ◽  
Sky Survey ◽  
Data Release ◽  
Formation And Evolution

We present a new catalog of isolated galaxies (coined as UNAM–KIAS) obtained through an automated systematic search. The 1520 isolated galaxies were found in ~ 1.4 steradians of the sky in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5) photometry. The selection algorithm was implemented from a variation of the criteria developed by Karachentseva (1973), with full redshift information. This new catalog is aimed to carry out comparative studies of environmental effects and constraining the currently competing scenarios of galaxy formation and evolution.

scholarly journals The Structure of the Stellar Hosts in Blue Compact Dwarf Galaxies

2006 ◽  
Vol 2 (S235) ◽  
pp. 300-300
Author(s):  
R.O. Amorín ◽  
J.A.L. Aguerri ◽  
L.M. Cairós ◽  
N. Caon ◽  
C. Muñoz-Tuñón
Keyword(s):  
Galaxy Formation ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
Structural Parameters ◽  
Host Galaxy ◽  
Host Galaxies ◽  
Galaxy Formation And Evolution ◽  
Radial Profiles ◽  
Low Surface Brightness ◽  
Formation And Evolution

AbstractBlue compact dwarf (BCD) galaxies are gas-rich, low-luminosity (Mb≳-18 mag) and compact systems, currently undergoing violent star-formation burst (Sargent & Searle 1970). While it was initially hypothesized that they were very young galaxies (e.g. Sargent & Searle 1970, et al. 1988), the subsecuent detection of an extended, redder stellar host galaxy showed that the vast majority of them are old systems (e.g. Gil de Paz et al. 2003,2005). BCDs play an important role for understanding the process of galaxy formation and evolution.The structural properties of the low surface brightness stellar host in BCDs are often studied by fitting r1/n models to the outer regions of their radial profiles. The limitations imposed by the presence of a large starburst emission overlapping the underlying component makes this kind of analysis a difficult task.We propose a two-dimensional fitting methodology in order to improve the extraction of the structural parameters of the LSB host Amorín et al. 2006, submitted). A set of ideal simulations are presented in order to test the reliability of the method and to determine its robustness and flexibility. We present the different steps of the method discussing its advantages and weaknesses. We compare the results for a sample of eight objects with those already obtained using a one-dimensional technique (Caon et al. 2005).We fit a PSF convolved Sérsic model to the BVR images with the GALFIT publicly software (Peng et al. 2002). We restrict the fit to the stellar host by masking out the starburst region and take special care to minimize the sky-subtraction uncertainties. Consistency checks are performed to assess the reliability and accuracy of the derived structural parameters.We obtain robust fits for all the sample galaxies, all of which, except one, show low Sérsic indices n—very close to 1—with good agreement in the three bands. These findings suggest that the stellar hosts in BCDs have near-exponential profiles. Since the Sérsic index n of host galaxies is important in the context of the possible structural and evolutionary connections among the different types of dwarf galaxies, we are currently extending the study to a larger sample of objects. This kind of studies will help us to understand the mechanisms that form and shape BCD galaxies, and how they relate to the other dwarf galaxy classes.

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