Diffuse Light in Galaxy Clusters


Introduction    Recent results    Publications   MPE   OPINAS   Dynamics Group


Introduction

Diffuse intracluster light (ICL) has now been observed in nearby and in intermediate redshift clusters. Individual intracluster stars have been detected in the Virgo, Hydra, and Coma clusters () and the first color-magnitude diagram and velocity measurements have been obtained. Recent studies show that the ICL contains of the order of 10% and perhaps up to 30% of the mass in stars of the cluster, but in the cores of more dense and rich clusters like Coma, the local ICL fraction can be high as 40%-50%. What can we learn from the ICL about the formation of galaxy clusters and the evolution of cluster galaxies? How and when did the ICL form? What are the dominant processes: tidal stripping, disruption, mergers? What is the connection to the central brightest cluster galaxy? Cosmological N-body and hydrodynamical simulations are now beginning to make predictions for the kinematics and origin of the ICL. The evolution of baryonic substructures in dense environments is traced by the ICL which can thus be used to constrain those aspects of cosmological simulations that are most uncertain, such as the modeling of star formation and the mass distribution of the baryonic component in galaxies. The first conference dedicated to the ICL was the Joint Discussion 2 at the General Assembly of the IAU at Rio de Janeiro in August 2009.

Recent results

A tale of two tails and an off-centered envelope: diffuse light around the cD galaxy NGC 3311 in the Hydra I cluster

The formation of intracluster light and extended halos around brightest cluster galaxies is closely related to morphological transformation, tidal stripping, and the disruption of galaxies in clusters. We looked for observational evidence to characterize these processes, by studying the morphology and kinematics of the diffuse light in the core of the Hydra I cluster. We found that the central galaxy NGC 3311 is surrounded by an extended, symmetric outer halo and an additional, off-centered envelope whose centroid is shifted by about 50`` to the north-east. The show that an entire group of small galaxies is currently falling through the core of the Hydra I cluster; some of these galaxies have already been partially dissolved by the strong tidal field. Their light is being added to the outer halo and intracluster light around the cD galaxy NGC 3311. The Hydra I cluster provides a vivid example of the morphological transformation and tidal dissolution of galaxies in clusters.Complete paper on ADS

Parameter range

Residual VLT/FORS1 V-band image after subtracting a photometric model for NGC 3311 and NGC 3309. The white ellipse indicates the extended halo off-centered towards the NE of the bright inner regions of NGC 3311 (black). The most noticeable substructure on top of the extended envelope NE of NGC 3311 is the tidal stream associated with the dwarf galaxy HCC 026. Its NW part is indicated on the image with the blue dashed polygon. At larger radii, and at fainter surface brightness levels, we see a thicker tail around HCC 007. The two small objects near the center of the NE polygon appear to be connected by a further small stream. NGC 007 has already lost ~half of its light, while NGC026 is mostly dissolved.


Diffuse Light in Galaxy Clusters JD2: XXVII IAU General Assembly Rio de Janeiro - August 6-7, 2009


Poster

Joint Discussion at the IAU General Assembly in Rio de Janeiro
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The Coma Cluster


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The Hydra I Cluster


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Publications

Arnaboldi, M., Ventimiglia, G., Iodice, E., Gerhard, O., Coccato, L. 2012,  A&A,  545,  A37.   
A tale of two tails and an off-centered envelope: diffuse light around the cD galaxy NGC 3311 in the Hydra I cluster.
2012A&A...545A..37A 

Coccato, L., Gerhard, O., Arnaboldi, M., Ventimiglia, G. 2011,  A&A,  533,  A138.   
Stellar population and the origin of intra-cluster stars around brightest cluster galaxies: the case of NGC 3311. 2011A&A...533A.138C 

Ventimiglia, G., Arnaboldi, M., Gerhard, O. 2011,  A&A,  528,  A24.   
The unmixed kinematics and origins of diffuse stellar light in the core of the Hydra I cluster (Abell 1060). 2011A&A...528A..24V 

Coccato, L., Gerhard, O., Arnaboldi, M. 2010,  MNRAS,  407,  L26.   
Distinct core and halo stellar populations and the formation history of the bright Coma cluster early-type galaxy NGC 4889.
2010MNRAS.407L..26C 

Ventimiglia, G., Gerhard, O., Arnaboldi, M., Coccato, L. 2010,  A&A,  520,  L9.   
The dynamically hot stellar halo around NGC 3311: a small cluster-dominated central galaxy. 2010A&A...520L...9V 

Coccato, L., Arnaboldi, M., Gerhard, O., Freeman, K. C., Ventimiglia, G., Yasuda, N. 2010,  A&A,  519,  A95.   
Kinematics and line strength indices in the halos of the Coma brightest cluster galaxies NGC 4874 and NGC 4889.
2010A&A...519A..95C 

McNeil, E. K., Arnaboldi, M., Freeman, K. C., Gerhard, O. E., Coccato, L., Das, P. 2010,  A&A,  518,  A44.   
Counter-dispersed slitless-spectroscopy technique: planetary nebula velocities in the halo of NGC 1399. 2010A&A...518A..44M 

Arnaboldi, M., Gerhard, O. 2010,  HiA,  15,  97.   
JD2 - Diffuse Light in Galaxy Clusters. 2010HiA....15...97A 

Castro-Rodriguéz, N., Arnaboldi, M., Aguerri, J. A. L., Gerhard, O., Okamura, S., Yasuda, N., et al. 2009,  A&A,  507,  621.   
Intracluster light in the Virgo cluster: large scale distribution. 2009A&A...507..621C

Doherty, M., Arnaboldi, M., Das, P., Gerhard, O., Aguerri, J. A. L., Ciardullo, R., et al. 2009, A&A, 502, 771.
The edge of the M 87 halo and the kinematics of the diffuse light in the Virgo cluster core. 2009A&A...502..771D

Arnaboldi, M., Doherty, M., Gerhard, O., Ciardullo, R., Aguerri, J. A. L., Feldmeier, J. J., et al. 2008, ApJ, 674, L17.
Expansion Velocities and Core Masses of Bright Planetary Nebulae in the Virgo Cluster. 2008ApJ...674L..17A

Ventimiglia, G., Arnaboldi, M., Gerhard, O. 2008, AN, 329, 1057.
Intracluster Planetary Nebulae in the Hydra I cluster. 2008AN....329.1057V

Gerhard, O., Arnaboldi, M., Freeman, K. C., Okamura, S., Kashikawa, N., Yasuda, N. 2007, A&A, 468, 815.
The kinematics of intracluster planetary nebulae and the on-going subcluster merger in the Coma cluster core. 2007A&A...468..815G

Murante, G., Giovalli, M., Gerhard, O., Arnaboldi, M., Borgani, S., Dolag, K. 2007, MNRAS, 377, 2.
The importance of mergers for the origin of intracluster stars in cosmological simulations of galaxy clusters. 2007MNRAS.377....2M

Arnaboldi, M., Gerhard, O., Okamura, S., Kashikawa, N., Yasuda, N., Freeman, K. C. 2007, PASJ, 59, 419.
Multi-Slit Imaging Spectroscopy Technique: Catalog of Intracluster Planetary Nebulae in the Coma Cluster. 2007PASJ...59..419A

Williams, B. F., Ciardullo, R., Durrell, P. R., Vinciguerra, M., Feldmeier, J. J., Jacoby, G. H., et al. 2007, ApJ, 656, 756.
The Metallicity Distribution of Intracluster Stars in Virgo. 2007ApJ...656..756W

Durrell, P. R., Williams, B. F., Ciardullo, R., Feldmeier, J. J., von Hippel, T., Sigurdsson, S., et al. 2007, ApJ, 656, 746.
The Resolved Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster. 2007ApJ...656..746D

Williams, B. F., Ciardullo, R., Durrell, P. R., Feldmeier, J. J., Sigurdsson, S., Vinciguerra, M., et al. 2007, ApJ, 654, 835.
Virgo's Intracluster Globular Clusters as Seen by the Advanced Camera for Surveys. 2007ApJ...654..835W

Aguerri, J. A. L., Castro-Rodríguez, N., Napolitano, N., Arnaboldi, M., Gerhard, O. 2006, A&A, 457, 771.
Diffuse light in Hickson compact groups: the dynamically young system HCG 44. 2006A&A...457..771A

Aguerri, J. A. L., Gerhard, O. E., Arnaboldi, M., Napolitano, N. R., Castro-Rodriguez, N., Freeman, K. C. 2005, AJ, 129, 2585.
Intracluster Stars in the Virgo Cluster Core. 2005AJ....129.2585A

Gerhard, O., Arnaboldi, M., Freeman, K. C., Kashikawa, N., Okamura, S., Yasuda, N. 2005, ApJ, 621, L93.
Detection of Intracluster Planetary Nebulae in the Coma Cluster. 2005ApJ...621L..93G

Arnaboldi, M., Gerhard, O., Aguerri, J. A. L., Freeman, K. C., Napolitano, N. R., Okamura, S., et al. 2004, ApJ, 614, L33.
The Line-of-Sight Velocity Distributions of Intracluster Planetary Nebulae in the Virgo Cluster Core. 2004ApJ...614L..33A

Murante, G., Arnaboldi, M., Gerhard, O., Borgani, S., Cheng, L. M., Diaferio, A., et al. 2004, ApJ, 607, L83.
The Diffuse Light in Simulations of Galaxy Clusters. 2004ApJ...607L..83M