THE NEXT GENERATION VIRGO CLUSTER SURVEY-INFRARED (NGVS-IR). I. A NEW NEAR-ULTRAVIOLET, OPTICAL, AND NEAR-INFRARED GLOBULAR CLUSTER SELECTION TOOL
Roberto P. Munoz
,
Thomas H. Puzia
,
Ariane Lançon
(1)
,
Eric W. Peng
,
Patrick Cote
,
Laura Ferrarese
,
John P. Blakeslee
,
Simona Mei
(2)
,
Jean-Charles Cuillandre
(3)
,
Patrick Hudelot
(4)
,
Stephane Courteau
,
Pierre-Alain Duc
(5, 6)
,
Michael L. Balogh
(7, 8)
,
Alessandro Boselli
(9)
,
Frédéric Bournaud
(10)
,
Raymond G. Carlberg
,
Scott C. Chapman
(11)
,
Patrick Durrell
,
Paul Eigenthaler
,
Eric Emsellem
(12, 13)
,
Giuseppe Gavazzi
(14)
,
Stephen Gwyn
,
Marc Huertas-Company
(2)
,
Olivier Ilbert
(9)
,
Andres Jordan
(15)
,
Ronald Laesker
,
Rossella Licitra
(2)
,
Chengze Liu
,
Lauren Macarthur
,
Alan Mcconnachie
,
Henry Joy Mccracken
,
Yannick Mellier
(16)
,
Chien Y. Peng
,
Anand Raichoor
,
Matthew A. Taylor
,
John L. Tonry
,
R. Brent Tully
,
Hongxin Zhang
(17)
1
ObAS -
Observatoire astronomique de Strasbourg
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 CFHT - Canada-France-Hawaii Telescope Corporation
4 UMS 831 - Services communs OMP
5 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
6 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
7 University of Waterloo [Waterloo]
8 Leiden Observatory [Leiden]
9 LAM - Laboratoire d'Astrophysique de Marseille
10 DAP - Département d'Astrophysique (ex SAP)
11 Dalhousie University [Halifax]
12 CRAL - Centre de Recherche Astrophysique de Lyon
13 ESO - European Southern Observatory
14 UNIMIB - Università degli Studi di Milano-Bicocca = University of Milano-Bicocca
15 UC - Pontificia Universidad Católica de Chile
16 IAP - Institut d'Astrophysique de Paris
17 RCEES - Research Center for Eco-Environmental Sciences
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 CFHT - Canada-France-Hawaii Telescope Corporation
4 UMS 831 - Services communs OMP
5 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
6 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
7 University of Waterloo [Waterloo]
8 Leiden Observatory [Leiden]
9 LAM - Laboratoire d'Astrophysique de Marseille
10 DAP - Département d'Astrophysique (ex SAP)
11 Dalhousie University [Halifax]
12 CRAL - Centre de Recherche Astrophysique de Lyon
13 ESO - European Southern Observatory
14 UNIMIB - Università degli Studi di Milano-Bicocca = University of Milano-Bicocca
15 UC - Pontificia Universidad Católica de Chile
16 IAP - Institut d'Astrophysique de Paris
17 RCEES - Research Center for Eco-Environmental Sciences
Roberto P. Munoz
- Fonction : Auteur
Thomas H. Puzia
- Fonction : Auteur
Ariane Lançon
- Fonction : Auteur
- PersonId : 746427
- IdHAL : ariane-lancon
- ORCID : 0000-0002-7214-8296
- IdRef : 03581537X
Eric W. Peng
- Fonction : Auteur
Patrick Cote
- Fonction : Auteur
Laura Ferrarese
- Fonction : Auteur
John P. Blakeslee
- Fonction : Auteur
Stephane Courteau
- Fonction : Auteur
Pierre-Alain Duc
- Fonction : Auteur
- PersonId : 179615
- IdHAL : pierre-alain-duc
- ORCID : 0000-0003-3343-6284
- IdRef : 081788339
Alessandro Boselli
- Fonction : Auteur
- PersonId : 738628
- IdHAL : alessandro-boselli
- ORCID : 0000-0002-9795-6433
- IdRef : 095606696
Raymond G. Carlberg
- Fonction : Auteur
Patrick Durrell
- Fonction : Auteur
- PersonId : 780590
- ORCID : 0000-0001-9427-3373
Paul Eigenthaler
- Fonction : Auteur
Eric Emsellem
- Fonction : Auteur
- PersonId : 755373
- ORCID : 0000-0002-6155-7166
Stephen Gwyn
- Fonction : Auteur
- PersonId : 780540
- ORCID : 0000-0001-8221-8406
Marc Huertas-Company
- Fonction : Auteur
- PersonId : 757665
- ORCID : 0000-0002-1416-8483
- IdRef : 253021081
Ronald Laesker
- Fonction : Auteur
Chengze Liu
- Fonction : Auteur
Lauren Macarthur
- Fonction : Auteur
Alan Mcconnachie
- Fonction : Auteur
Henry Joy Mccracken
- Fonction : Auteur
Chien Y. Peng
- Fonction : Auteur
Anand Raichoor
- Fonction : Auteur
Matthew A. Taylor
- Fonction : Auteur
John L. Tonry
- Fonction : Auteur
R. Brent Tully
- Fonction : Auteur
Résumé
The NGVS-IR project (Next Generation Virgo Cluster Survey-Infrared) is a contiguous, near-infrared imaging survey of the Virgo cluster of galaxies. It complements the optical wide-field survey of Virgo (NGVS). In its current state, NGVS-IR consists of K-s-band imaging of 4 deg(2) centered on M87 and J- and K-s-band imaging of similar to 16 deg(2) covering the region between M49 and M87. We present observations of the central 4 deg(2) centered on Virgo's core region. The data were acquired with WIRCam on the Canada-France-Hawaii Telescope, and the total integration time was 41 hr distributed over 34 contiguous tiles. A survey-specific strategy was designed to account for extended galaxies while still measuring accurate sky brightness within the survey area. The average 5s limiting magnitude is K-s = 24.4 AB mag, and the 50% completeness limit is K-s = 23.75 AB mag for point-source detections, when using only images with better than 0.” 7 seeing (median seeing 0.” 54). Star clusters are marginally resolved in these image stacks, and Virgo galaxies with mu(Ks) similar or equal to 24.4 AB mag arcsec(-2) are detected. Combining the K-s data with optical and ultraviolet data, we build the uiK(s) color-color diagram, which allows a very clean color-based selection of globular clusters in Virgo. This diagnostic plot will provide reliable globular cluster candidates for spectroscopic follow-up campaigns, needed to continue the exploration of Virgo's photometric and kinematic substructures, and will help the design of future searches for globular clusters in extragalactic systems. We show that the new uiK(s) diagram displays significantly clearer substructure in the distribution of stars, globular clusters, and galaxies than the gzK(s) diagram-the NGVS + NGVS-IR equivalent of the BzK diagram that is widely used in cosmological surveys. Equipped with this powerful new tool, future NGVS-IR investigations based on the uiK(s) diagram will address the mapping and analysis of extended structures and compact stellar systems in and around Virgo galaxies.