INTERFEROMETRIC IMAGING OF THE SUNYAEV-ZELDOVICH EFFECT AT 30 GHZ

Citation
Je. Carlstrom et al., INTERFEROMETRIC IMAGING OF THE SUNYAEV-ZELDOVICH EFFECT AT 30 GHZ, The Astrophysical journal, 456(2), 1996, pp. 75
Citations number
20
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
456
Issue
2
Year of publication
1996
Part
2
Database
ISI
SICI code
0004-637X(1996)456:2<75:IIOTSE>2.0.ZU;2-6
Abstract
We present high signal-to-noise ratio images of the Sunyaev-Zeldovich effect toward the clusters CL 0016+16 and Abell 773. A null result is reported for Abell 1704. The data were obtained with the millimeter ar ray of the Owens Valley Radio Observatory outfitted with 30 GHz receiv ers. Isothermal models for the cluster gas with core radii spanning 20 ''-100 '' were fitted to the visibility data. The results suggest the central decrement Delta T-0 lies within the range -700 to -820 mu K f or CL 0016+16 and -575 to -760 mu K for Abell 773, corresponding to Co mpton y-values of 1.3-1.5 x 10(-4) and 1.1-1.4 x 10(-4), respectively. A comparison of the image of the Sunyaev-Zeldovich effect toward CL 0 016+16 with a ROSAT image of the X-ray emission shows good corresponde nce; the positions agree within the uncertainties, and both images sho w resolved structure elongated at a position angle of similar to 50 de grees. Using the core radius and ellipticity derived from the X-ray da ta to constrain the model parameters resulted in a decrement for CL 00 16+16 of Delta T-0 = -717 +/- 65 mu K.