J/A+A/663/A158 Deep NIR view of Ophiuchus galaxy cluster (Galdeano+, 2022)
A deep near-infrared view of the Ophiuchus galaxy cluster.
Galdeano D., Coldwell G., Duplancic F., Alonso S., Pereyra L.,
Minniti D., Zelada Bacigalupo R., Valotto C., Baravalle L., Alonso M.V.,
Nilo Castellon J.L.
<Astron. Astrophys. 663, A158 (2022)>
=2022A&A...663A.158G 2022A&A...663A.158G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Photometry, infrared ;
Morphology
Keywords: catalogs - galaxies: clusters: general - Galaxy: bulge -
infrared: galaxies - galaxies: clusters: individual: Ophiuchus
Abstract:
The Ophiuchus cluster of galaxies, located at low latitudes in the
direction of the Galactic bulge, has been relatively poorly studied in
comparison with other rich galaxy clusters like Coma, Virgo and
Fornax, in spite of being the 2nd brightest X-ray cluster in the sky.
Our aim is perform a study of the hidden galaxy population of the
massive cluster Ophiuchus located in the Zone of Avoidance.
Deep near-infrared images and photometry from the VISTA Variables in
the Via Lactea eXtended survey (VVVX) were used to detect galaxy
member candidates of Ophiuchus cluster up to 2Mpc from the cD galaxy
2MASX J17122774-2322108 using the Galdeano et al. criteria to select
the galaxies among the foreground sources. We also perform a
morphological visual classification, color-magnitude diagram and
density profiles.
We identified 537 candidate galaxy members of the Ophiuchus cluster up
to 2Mpc from the cD galaxy, increasing 7 times the number of galaxies
reported in previous catalogs. In addition, we performed a
morphological classification of these galaxy candidates finding that
the fraction of Ellipticals reaches more than the 60% in the central
region of the cluster. On the other hand the Spirals fraction is lower
than the 20% remaining almost constant throughout the cluster.
Moreover, we study the red sequence of galaxy member candidates and
use mock catalogs to explore the density profile of the cluster,
finding that the value derived from the mock catalog towards an
overdense region is in agreement with the galaxy excess of the central
zone of the Ophiuchus cluster.
Our investigation of the hidden population of Ophiuchus galaxies
underscores the importance of this cluster as a prime target for
future photometric and spectroscopic studies. Moreover the results of
this work highlights the potential of VVVX survey to study
extragalactic objects in the Zone of Avoidance.
Description:
We have investigated the hidden galaxy population of the massive
Ophiuchus cluster. We used deep near-infrared photometry provided by
the VVVX survey and analyzed the b505 and b506 tiles, over which the
cluster extends. These tiles are located behind the Galactic bulge,
near the edge of the VVVX.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 188 537 VVVX galaxies of the massive cluster Ophiuchus
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See also:
VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+A/583/A124 : Ophiuchus r'g'z' photometry and redshifts (Durret+, 2015)
J/A+A/613/A20 : Oph cluster galaxies r' magnitudes and sizes (Durret+, 2018)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- IAUname Unique identifier in IAU naming
convention VVVXJHHMMSS.ss+DDMMSS.s
25- 26 I2 h RAh Right Ascension (J2000)
28- 29 I2 min RAm Right Ascension (J2000)
31- 35 F5.2 s RAs Right Ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 47 F4.1 arcsec DEs Declination (J2000)
49- 53 F5.2 mag Ksmag(3) Aperture magnitude within 3 pixels in Ks
55- 58 F4.2 mag e_Ksmag(3) Error Aperture magnitude within 3 pixels
in Ks
60- 64 F5.2 mag Hmag(3) Aperture magnitude within 3 pixels in H
66- 69 F4.2 mag e_Hmag(3) Error Aperture magnitude within 3 pixels
in H
71- 75 F5.2 mag Jmag(3) Aperture magnitude within 3 pixels in J
77- 80 F4.2 mag e_Jmag(3) Error Aperture magnitude within 3 pixels
in J
82- 86 F5.2 mag Ksmag Total magnitude Ks
88- 91 F4.2 mag e_Ksmag Error Total magnitude Ks
93- 97 F5.2 mag Hmag Total magnitude H
99-102 F4.2 mag e_Hmag Error Total magnitude H
104-108 F5.2 mag Jmag Total magnitude J
110-113 F4.2 mag e_Jmag Error Total magnitude J
115-118 F4.2 --- CS Class_Star parameter (0=galaxy, 1=star)
120-124 F5.2 arcsec R1/2 Half light radius
126 I1 --- MType [0/5] Morphological type
128-132 F5.3 --- z ? Redshift
134-168 A35 --- OName Source name in other surveys
170-188 A19 --- r_OName Reference (Bibcode) for redshifts and
source name in other surveys (1)
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Note (1): References:
2003A&A...412...45P 2003A&A...412...45P = Paturel et al., 2003, Cat. VII/237, HYPERLEDA
2006AJ....131.1163S 2006AJ....131.1163S = Skrutskie et al., 2006, Cat. VII/233, 2MASX
2009MNRAS.399..683J 2009MNRAS.399..683J = Jones et al., Cat. VII/259, 6dF
2015A&A...583A.124D 2015A&A...583A.124D = Durret et al., 2015, Cat. J/A+A/583/A124
2018yCat.1345....0G 2018yCat.1345....0G = Gaia Collabaration, 2018, Gaia DR2, Cat. I/345
2020yCat.1350....0G 2020yCat.1350....0G = Gaia Collabaration, 2020, Gaia EDR3, Cat. I/350
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Acknowledgements:
Daniela Galdeano, dgaldeano(at)unsj-cuim.edu.ar
(End) Daniela Galdeano [UNSJ], Patricia Vannier [CDS] 06-May-2022