scholarly journals Near infrared surface photometry of late-type Virgo cluster galaxies

1997 ◽  
Vol 121 (3) ◽  
pp. 507-551 ◽  
Author(s):  
A. Boselli ◽  
R. J. Tuffs ◽  
G. Gavazzi ◽  
H. Hippelein ◽  
D. Pierini
Keyword(s):  
Near Infrared ◽  
Virgo Cluster ◽  
Surface Photometry ◽  
Late Type ◽  
Cluster Galaxies

Near Infrared Imaging of Late Type Virgo Cluster Galaxies

1996 ◽  
pp. 210-213
Author(s):  
Alessandro Boselli ◽  
Giuseppe Gavazzi ◽  
Hans Hippelein ◽  
James Lequeux ◽  
Daniele Pierini ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Virgo Cluster ◽  
Late Type ◽  
Near Infrared Imaging ◽  
Cluster Galaxies

scholarly journals Dissecting early-type dwarf galaxies into their multiple components

2012 ◽  
Vol 10 (H16) ◽  
pp. 364-364
Author(s):  
Joachim Janz ◽  
Eija Laurikainen ◽  
Thorsten Lisker ◽  
Heikki Salo
Keyword(s):  
Near Infrared ◽  
Dwarf Galaxies ◽  
Signal To Noise Ratio ◽  
Transformation Process ◽  
Virgo Cluster ◽  
Early Type ◽  
Late Type ◽  
Component Structure ◽  
Lenticular Galaxies ◽  
Low Mass

AbstractEarly-type dwarf galaxies are often thought to be either more diffuse versions of giant ellipticals or to be low-mass disk galaxies that were quenched and heated by the environment. In both cases, the picture that most astronomers have in mind probably is that of a dynamically hot, regular shaped galaxy, in which any previous substructure has either been smeared out, or has never been there. However, the early-type dwarfs are not that simple.We analyzed ~100 such objects in the Virgo cluster using deep near-infrared images and found that the majority has a multi-component structure, sometimes even with bars or lenses. The study was done by applying GALFIT to images from the SMAKCED collaboration (Stellar content, MAss and K inematics of Cluster Early-type Dwarfs, http://www.smakced.net). The sample comprises early-type galaxies in the Virgo cluster in a brightness range of −19 ≤ Mr ≤ −16 mag, and the data is complete down to Mr=−16.73 mag. The images typically reach a signal-to-noise ratio of 1 per pixel of ~0.25” at a surface brightness of ~22.5 mag/arcsec2 in the H-band. The galaxies were fitted with two-dimensional models, either with a simple Sérsic model or inner and outer components, as well as bars and lenses. Only a fraction of 31% of the galaxies can be fitted with a single Sérsic function. This fraction of “simple“ galaxies turns out to be a strong function of luminosity, with a smaller fraction for brighter objects. The bar fraction is 14% and also in 14% of the galaxies lenses were fitted.When comparing the flattening distribution, the early-type dwarfs are more similar to spiral galaxies than to elliptical or lenticular galaxies. It is disputable whether or not the dwarfs follow a common relation with the bright elliptical galaxies, e.g. in the brightness versus size diagram. At the same time, they appear as smooth continuation of bright late-type galaxies in this diagram. The inner and outer components, as well as the simple galaxies have similar flattening distributions. The inner components are mostly fitted with Sérsic-n values close to~1, i.e. with nearly exponential profiles. We argue that the inner components in the early-type dwarfs are not be bulges but may form parts of the disks, in which the matter was re-distributed during the transformation process from a late-type progenitor.

scholarly journals Far‐Infrared Photometry of a Statistical Sample of Late‐Type Virgo Cluster Galaxies

2002 ◽  
Vol 139 (1) ◽  
pp. 37-79 ◽  
Author(s):  
Richard J. Tuffs ◽  
Cristina C. Popescu ◽  
Daniele Pierini ◽  
Heinrich J. Volk ◽  
Hans Hippelein ◽  
...  
Keyword(s):  
Far Infrared ◽  
Virgo Cluster ◽  
Infrared Photometry ◽  
Late Type ◽  
Cluster Galaxies ◽  
Statistical Sample

scholarly journals Cold Dust in Late‐Type Virgo Cluster Galaxies

2002 ◽  
Vol 567 (1) ◽  
pp. 221-236 ◽  
Author(s):  
Cristina C. Popescu ◽  
Richard J. Tuffs ◽  
Heinrich J. Volk ◽  
Daniele Pierini ◽  
Barry F. Madore
Keyword(s):  
Virgo Cluster ◽  
Late Type ◽  
Cluster Galaxies ◽  
Cold Dust

UBVRandHubble Space TelescopeMid‐Ultraviolet and Near‐Infrared Surface Photometry and Radial Color Gradients of Late‐Type, Irregular, and Peculiar Galaxies

2005 ◽  
Vol 630 (2) ◽  
pp. 784-803 ◽  
Author(s):  
Violet A. Taylor ◽  
Rolf A. Jansen ◽  
Rogier A. Windhorst ◽  
Stephen C. Odewahn ◽  
John E. Hibbard
Keyword(s):  
Near Infrared ◽  
Surface Photometry ◽  
Late Type ◽  
Color Gradients ◽  
Peculiar Galaxies
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