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J/ApJ/835/212  Wide-field spectrosc. survey of GCs in Virgo cluster  (Ko+, 2017)

To the edge of M87 and beyond: spectroscopy of intracluster globular clusters and ultracompact dwarfs in the Virgo cluster. Ko Y., Hwang H.S., Lee M.G., Park H.S., Lim S., Sohn J., Jang I.S., Hwang N., Park B.-G. <Astrophys. J., 835, 212-212 (2017)> =2017ApJ...835..212K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Photometry, ugriz ; Radial velocities ; Clusters, globular Keywords: galaxies: clusters: individual: Virgo; galaxies: elliptical and lenticular, cD; galaxies: individual: M87; globular clusters: general; galaxies: kinematics and dynamics; galaxies: star clusters: general Abstract: We present the results of a wide-field spectroscopic survey of globular clusters (GCs) in the Virgo cluster. We obtain spectra for 201 GCs and 55 ultracompact dwarfs (UCDs) using Hectospec on the Multiple-Mirror Telescope and derive their radial velocities. We identify 46 genuine intracluster GCs (IGCs), not associated with any Virgo galaxies, using the 3D GMM test on the spatial and radial velocity distribution. They are located at a projected distance 200kpc≲R≲500kpc from the center of M87. The radial velocity distribution of these IGCs shows two peaks, one at vr=1023km/s, associated with the Virgo main body, and another at vr=36km/s, associated with the infalling structure. The velocity dispersion of the IGCs in the Virgo main body is σGC∼314km/s, which is smoothly connected to the velocity dispersion profile of M87 GCs but is much lower than that of dwarf galaxies in the same survey field, σdwarf∼608km/s. The UCDs are more centrally concentrated on massive galaxies-M87, M86, and M84. The radial velocity dispersion of the UCD system is much smaller than that of dwarf galaxies. Our results confirm the large-scale distribution of Virgo IGCs indicated by previous photometric surveys. The color distribution of the confirmed IGCs shows a bimodality similar to that of M87 GCs. This indicates that most IGCs are stripped off dwarf galaxies and some off massive galaxies in the Virgo. Description: We selected globular cluster (GC) candidates using the Next Generation Virgo Cluster Survey (NGVS; Ferrarese+ 2012ApJS..200....4F) archival images covering the central region of the Virgo cluster. The NGVS is a wide-field imaging survey of the Virgo cluster using MegaCam with a field of view of 1°x1° attached at the Canada-French-Hawaii Telescope. We carried out spectroscopic observation of GC candidates in the Virgo using the Hectospec mounted on the 6.5m Multiple-Mirror Telescope in queue mode under program ID 2014A-UAO-G18 (PI: Myung Gyoon Lee) between 2014 February and March (wavelength range: 3650Å to 9200Å). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 76 635 Spectroscopic and photometric properties of foreground stars and background galaxies table3.dat 119 633 Spectroscopic and photometric properties of the combined globular cluster (GC) sample table4.dat 103 138 Spectroscopic and photometric properties of the combined ultracompact dwarf (UCD) sample
See also: V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985) J/A+AS/139/393 : Young Massive Star Clusters. II. (Larsen, 1999) J/A+A/383/823 : Radial velocities of UCOs in Fornax (Mieske+, 2002) J/A+A/464/L21 : Velocities of globular clusters in Fornax (Bergond+, 2007) J/ApJ/655/144 : ACS Virgo Cluster Survey. XIII. (Mei+, 2007) J/A+A/477/L9 : Globular clusters around NGC 1399 (Schuberth+, 2008) J/MNRAS/396/1075 : GC in nearby dwarf galaxies. II (Georgiev+, 2009) J/ApJS/180/54 : GC candidates in ACS Virgo survey. (Jordan+, 2009) J/ApJS/182/216 : Surface photometry of Virgo ellipticals (Kormendy+, 2009) J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010) J/A+A/513/A52 : Velocities of NGC 1399 globular clusters (Schuberth+, 2010) J/AJ/142/199 : Sizes and luminosities of stellar systems (Brodie+, 2011) J/A+A/531/A4 : Ultra compact dwarfs and globulars in Hya I (Misgeld+, 2011) J/ApJS/197/33 : The M87 globular cluster system (Strader+, 2011) J/ApJ/748/29 : Spectroscopy of M87 globular clusters (Romanowsky+, 2012) J/ApJS/215/22 : The Extended Virgo Cluster Catalog (EVCC) (Kim+, 2014) J/ApJ/802/30 : NGVS VI. Ultra-compact dwarfs in M87 (Zhang+, 2015) J/MNRAS/455/820 : M87 globular cluster candidates catalog (Oldham+, 2016) J/ApJS/227/12 : NGVS XXV. Virgo globular clusters photometry (Powalka+, 2016) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- S/G "STAR" or "GAL" 5- 7 I03 --- Seq Running sequence number within S/G class 9- 18 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 20- 28 F9.6 deg DEdeg Declination in decimal degrees (J2000) 30- 35 F6.3 mag imag [17.1/21] CFHT/MegaCam i band AB magnitude 37- 41 F5.3 mag e_imag [0/0.007] Error in imag 43- 47 F5.3 mag g-r [0.3/1] The (g-r) color index 49- 53 F5.3 mag e_g-r Error in g-r 55- 59 F5.3 mag g-i [0.6/1.7] The (g-i) color index 61- 65 F5.3 mag e_g-i Error in g-i 67- 72 I6 km/s HRV [-295/240245] Heliocentric radial velocity 74- 76 I3 km/s e_HRV [4/431] Error in HRV
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- ID Identification (1) 8- 17 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 19- 27 F9.6 deg DEdeg Declination in decimal degrees (J2000) 29- 34 F6.3 mag imag [17.8/23.5] i band AB magnitude 36- 40 F5.3 mag e_imag [0.001/0.02]? Error in imag 42- 46 F5.3 mag g-r [0.3/0.9]? The (g-r) color index 48- 52 F5.3 mag e_g-r ? Error in g-r 54- 58 F5.3 mag g-i [0.6/1.3]? The (g-i) color index 60- 64 F5.3 mag e_g-i ? Error in g-i 66- 68 A3 --- r_phot Source of photometry (2) 70- 73 I4 km/s HRV [-728/2777] Heliocentric radial velocity 75- 77 I3 km/s e_HRV [5/114] Error in HRV 79- 81 A3 --- r_HRV Source of HRV (2) 83- 85 F3.1 pc rh [1.3/9.2]? Half-light radius 87- 89 F3.1 pc E_rh [0/1.5]? Upper error in rh 91- 93 F3.1 pc e_rh [0/1.1]? Lower error in rh 95- 97 A3 --- r_rh ? Source of rh (2) 99-111 A13 --- Gal1 Host galaxy determined by Mclust method (3) 113-119 A7 --- Gal2 Host galaxy determined by Rv cut method
Note (1): GCNNN for sources from this study or HNNNNN/TNNNNN for sources from Strader et al. (2011, J/ApJS/197/33; <[SRB2011] {HT}NNNNN> in Simbad) or SNNNN for sources from Hanes+, 2001, J/ApJ/559/812; <[SFH81] NNNN> in Simbad. Note (2): Reference as follows: K16 = this study. S11 = Strader et al. (2011, J/ApJS/197/33). J09 = Jordan et al. (2009, J/ApJS/180/54). The magnitudes of this study and S11 are CFHT/MegaCam AB and dereddened SDSS AB magnitudes, respectively. Note (3): The Mclust subgroup that a given UCD belongs to is in parentheses.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Identification (1) 11- 20 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 22- 30 F9.6 deg DEdeg Declination in decimal degrees (J2000) 32- 37 F6.3 mag imag [17.5/22.3] i band AB magnitude 39- 43 F5.3 mag e_imag [0.001/0.02]? Error in imag 45- 49 F5.3 mag g-r [0.4/0.8]? The (g-r) color index 51- 55 F5.3 mag e_g-r ? Error in g-r 57- 61 F5.3 mag g-i [0.6/1.2]? The (g-i) color index 63- 67 F5.3 mag e_g-i ? Error in g-i 69- 71 A3 --- r_phot Source of photometry (2) 73- 76 I4 km/s HRV [-416/2419] Heliocentric radial velocity 78- 80 I3 km/s e_HRV [2/146] Error in HRV 82- 84 A3 --- r_HRV Source of HRV (2) 86- 89 F4.1 pc rh [0.6/40.2]? Half-light radius 91- 93 F3.1 pc E_rh [0/8.4]? Upper error in rh 95- 97 F3.1 pc e_rh [0/8.4]? Lower error in rh 99-101 A3 --- r_rh ? Source of rh (2) 103 A1 --- Mcl [A-C] Mclust subgroup that a given UCD belongs to
Note (1): UCDNN for sources from this study or M87UCD-NN for sources from Zhang et al. (2015, J/ApJ/802/30; <[ZPC2015] M87UCD NN> in Simbad) or SNNNN for sources from Hanes+, 2001, J/ApJ/559/812; <[SFH81] NNNN> in Simbad or HNNNNN/TNNNNN for sources from Strader et al. (2011, J/ApJS/197/33; <[SRB2011] {HT}NNNNN> in Simbad). Note (2): Reference as follows: K16 = this study. Z15 = Zhang et al. (2015, J/ApJ/802/30). J09 = Jordan et al. (2009, J/ApJS/180/54). The magnitudes of this study and Z15 are CFHT/MegaCam AB and dereddened SDSS AB magnitudes, respectively.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 31-Aug-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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