The COSMOS field has been observed by both XMM-Newton and Chandra.


(PI: G. Hasinger) covered the entire 2 deg2 with 50Ks per pointing. Additional information on the XMM campaign can be found on the XMM-COSMOS website
Contact: Marcella Brusa: marcella.brusa3 [at] unibo.it ; Alexis Finoguenov alexis.finoguenov [at] helsinki.fi



Chandra observed the entire field to a depth of ~2e-16 cgs with ACIS in the 0.5 - 2keV band, spending nearly 2 days at each location (~180 ksec exposure). The first phase was the Chandra COSMOS Survey (C-COSMOS), a 1.8 Megasecond GO program (PI: Martin Elvis, Cycle 8) covering the central 0.9 sq. deg. C-COSMOS found 1761 X-ray sources, 97% of them having optical or infrared counterparts. Only 2 sources are truly empty fields. The second phase was approved in Chandra Cycle 14: the 2.8 Megasecond 'Chandra COSMOS Legacy' survey (PI: Francesca Civano), the second largest Chandra GO program awarded in 14 years. COSMOS-Legacy has completed the Chandra coverage of the full COSMOS field to the same depth.

The 'Chandra COSMOS Legacy' survey includes 4016 X-ray sources, 97% of which can be optically and NIR identified. The reference publications are: Civano et al. 2016 and Marchesi et al. 2016. A stacking tool for Chandra data, CSTACK, is also available. Learn more about it in Other Tools.

Contact: Francesca Civano - francesca.civano [at] gmail.com


Summary of X-Ray survey properties
Telescope Band (keV) Depth (cgs) Area (deg2)
XMM-Newton 0.5-2.0 7.27E-16 2
XMM-Newton 2.0-4.5 4.96E-15 2
XMM-Newton 4.5-10.0 8.20E-15 2
Chandra 0.5-2.0 2.2E-16 2.2
Chandra 2-10 1.5E-15 2.2
Chandra 0.5-10 8.9E-16 2.2


Below: Three color image of the whole COSMOS-Legacy field (0.5-2.0 keV, 2.0-4.5 keV, and 4.5-7.0 keV as red, green and blue, respectively). Courtesy of J. DePasquale.