[en] We detect a distant cluster of galaxies centered on the QSO lens and luminous X-ray source AX J2019+112, a.k.a. the ``Dark Cluster.'' Using deep V and I Keck images and wide-field K[SUB]s[/SUB] imaging from the New Technology Telescope (NTT), a tight red sequence of galaxies is identified within a radius of 0.2 h[SUP]-1[/SUP] Mpc of the known z=1.01 elliptical lensing galaxy. The sequence, which includes the central elliptical galaxy, has a slope in good agreement with the model predictions of Kodama et al. for z~1. We estimate the integrated rest-frame luminosity of the cluster to be L[SUB]V[/SUB]>=3.2x10[SUP]11[/SUP] h[SUP]-2[/SUP] L[SUB]solar[/SUB] (after accounting for significant extinction at the low latitude of this field), more than an order of magnitude higher than previous estimates. The central region of the cluster is deconvolved using the technique of Magain, Courbin, & Sohy, revealing a thick central arc coincident with an extended radio source. All the observed lensing features are readily explained by differential magnification of a radio-loud active galactic nucleus by a shallow elliptical potential. The QSO must lie just outside the diamond caustic, producing two images; the arc is a highly magnified image formed from a region close to the center of the host galaxy, projecting inside the caustic. The mass-to-light ratio within an aperture of 0.4 h[SUP]-1[/SUP] Mpc is M[SUB]X[/SUB]/L[SUB]V[/SUB]=224[SUP]+112[/SUP][SUB]- 78[/SUB]h(M/L[SUB]V[/SUB])[SUB]solar[/SUB], using the X-ray temperature. The strong lens model yields a compatible value, M/L[SUB]V[/SUB]=372[SUP]+94[/SUP][SUB]- 94[/SUB]h(M/L[SUB]V[/SUB])[SUB]solar[/SUB], whereas an independent weak-lensing analysis sets an upper limit of M/L[SUB]V[/SUB]<520h(M/L[SUB]V[/SUB])[SUB]solar[/SUB], typical of massive clusters.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Benítez, Narciso
Broadhurst, Tom
Rosati, Piero
Courbin, Fred
Squires, Gordon
Lidman, Chris
Magain, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
Deep Imaging of AX J2019+112: The Luminosity of a ``Dark Cluster''
Publication date :
01 December 1999
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Bahcall, N. A., & Fan, X. 1998, ApJ, 504, 1
Bartlett, J. G., Blanchard, A., & Barbosa, D. 1998, A&A, 336, 425
Moorwood, A., Cuby, J. G., & Lidman, C. 1998, ESO Mess., 91, 9
Nair, S., & Garrett, M. A. 1997, MNRAS, 284, 58
Narasimha, D., Subramanian, K., & Chitre, S. M. 1987, ApJ, 315, 434
Navarro, J. F., Frenk, C. S., & White, S. D. M. 1997, ApJ, 490, 493
Oke, J. B., et al. 1995, PASP, 107, 375
Persson, S. E., Murphy, D. C., Krzeminski, W., Roth, M., & Rieke, M. J. 1998, AJ, 116, 2475
Poggianti, B. M. 1997, A&AS, 122, 399
Richards, E. A., Fomalont, E. B., Kellermann, K. L., Partridge, R. B., & Windhorst R. A. 1997, AJ, 113, 1475
Rosati, P., Della Ceca, R., Norman, C., & Giacconi, R. 1998, ApJ, 492, L21
Rosati, P., Stanford, S. A., Eisenhardt, P. R., Elston, R., Spinrad, H., Stern, D., & Dey, A. 1999, AJ, 118, 76
Saunders, R., et al. 1997, ApJ, 479, L5
Schlegel, D. J., Finkbeiner, D. P., & Davis, M. 1998, ApJ, 500, 525
Schneider, D. P., Lawrence, C. R., Schmidt, M., Gunn, J. E., Turner, E. L., Burke, B. F., & Dhawan, V. 1985, ApJ, 294, 66
Smail, I., Ellis, R. S., Dressler, A., Couch, W. J., Oemler, A., J., Sharples, R. M., & Butcher, H. 1997, ApJ, 479, 70 (S97)
Smail, I., Hogg, D. W., Yan, L., & Cohen, J. G. 1995, ApJ, 449, L105
Squires, G., & Kaiser, N. 1996, ApJ, 473, 65
Squires, G., Kaiser, N., Babul, A., Fahlman, G., Woods, D., Neumann, D. M., & Böhringer, H. 1996, ApJ, 461, 572
Stanford, S. A., Eisenhardt, P. R., &Dickinson, M. 1998a, ApJ, 492, 461
Stanford, S. A., Elston, R., Eisenhardt, P., Spinrad, H., Stern, D., & Dey, A. 1998b, in ASP Conf. Ser. 146, The Young Universe: Galaxy Formation and Evolution at Intermediate and High Redshift, ed. S. D'Odorico, A. Fontana, &E. Giallongo (San Francisco: ASP), 514
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.