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THE EXTENDED VIRGO CLUSTER CATALOG
Kim, Suk,Rey, Soo-Chang,Jerjen, Helmut,Lisker, Thorsten,Sung, Eon-Chang,Lee, Youngdae,Chung, Jiwon,Pak, Mina,Yi, Wonhyeong,Lee, Woong IOP Publishing 2014 The Astrophysical journal Supplement series Vol.215 No.2
<P>We present a new catalog of galaxies in the wider region of the Virgo cluster, based on the Sloan Digital Sky Survey (SDSS) Data Release 7. The Extended Virgo Cluster Catalog (EVCC) covers an area of 725 deg(2) or 60.1 Mpc(2). It is 5.2 times larger than the footprint of the classical Virgo Cluster Catalog (VCC) and reaches out to 3.5 times the virial radius of the Virgo cluster. We selected 1324 spectroscopically targeted galaxies with radial velocities less than 3000 km s(-1). In addition, 265 galaxies that have been overlooked in the SDSS spectroscopic survey but have available redshifts in the NASA Extragalactic Database are also included. Our selection process secured a total of 1589 galaxies, 676 of which are not included in the VCC. The certain and possible cluster members are defined by means of redshift comparison with a cluster infall model. We employed two independent and complementary galaxy classification schemes: the traditional morphological classification based on the visual inspection of optical images and a characterization of galaxies from their spectroscopic features. SDSS u, g, r, i, and z passband photometry of all EVCC galaxies was performed using Source Extractor. We compare the EVCC galaxies with the VCC in terms of morphology, spatial distribution, and luminosity function. The EVCC defines a comprehensive galaxy sample covering a wider range in galaxy density that is significantly different from the inner region of the Virgo cluster. It will be the foundation for forthcoming galaxy evolution studies in the extended Virgo cluster region, complementing ongoing and planned Virgo cluster surveys at various wavelengths.</P>
LARGE-SCALE FILAMENTARY STRUCTURES AROUND THE VIRGO CLUSTER REVISITED
Kim, Suk,Rey, Soo-Chang,Bureau, Martin,Yoon, Hyein,Chung, Aeree,Jerjen, Helmut,Lisker, Thorsten,Jeong, Hyunjin,Sung, Eon-Chang,Lee, Youngdae,Lee, Woong,Chung, Jiwon American Astronomical Society 2016 The Astrophysical journal Vol.833 No.2
<P>We revisit the filamentary structures of galaxies around the Virgo cluster, exploiting a larger data set, based on the HyperLeda database, than previous studies. In particular, this includes a large number of low-luminosity galaxies, resulting in better sampled individual structures. We confirm seven known structures in the distance range 4. h(-1) Mpc < SGY < 16 h(-1) Mpc, now identified as filaments, where SGY is the axis of the supergalactic coordinate system roughly along the line of sight. The Hubble diagram of the filament galaxies suggests they are infalling toward the main body of the Virgo cluster. We propose that the collinear distribution of giant elliptical galaxies along the fundamental axis of the Virgo cluster is smoothly connected to two of these filaments (Leo. II. A and B). Behind the Virgo cluster (16. h(-1) Mpc. < SGY. < 27. h(-1) Mpc), we also identify a new filament elongated toward the NGC. 5353/4 group('NGC. 5353/4 filament') and confirm a sheet that includes galaxies from the W and M clouds of the Virgo cluster('W-M sheet'). In the Hubble diagram, the NGC. 5353/4 filament galaxies show infall toward the NGC 5353/4 group, whereas the W-M sheet galaxies do not show hints of gravitational influence from the Virgo cluster. The filamentary structures identified can now be used to better understand the generic role of filaments in the build-up of galaxy clusters at z approximate to 0.</P>