Examples from the GOODS-South (top) and UDS (bottom) fields: 15×15 arcsec regions from the original CH1 map (left) compared to the residual image where all the sources surrounding the z-drop target have been subtracted with T-PHOT (right).

Contexts in source publication

Context 1

... have been selected initially through appropriate recastings of the "Lyman-break" technique as described in Grazian et al. (2012). The final color-color selection criteria take into account the different sets of passbands available in the two fields (see Grogin et al. 2011;Koekemoer et al. 2011) resulting in slightly different redshift selection functions ( Figure 1 of Grazian et al. 2012). In addition to the Lyman-break-selected candidates, we also inserted in the available FORS2 slits targets that did not pass the above criteria but had a photometric redshift of z 6.5 phot > ...

Context 2

... the IRAC bands, where source confusion and blending is significant, we first perform a T-PHOT second pass run using the option exclfile ( Merlin et al. 2016) to generate residual images where only the z∼7 sources under analysis are left. In this way, all sources are modeled and those close to the z∼7 are effectively removed (see, e.g., Figure 1) such that these cleaned images can be used to generate reliable stacked images of the candidates. We then visually inspect all our sources and exclude threeobjects (oneLyα emitter and twonon-emitters) due to the presence of bad residual features close to the targets that can possibly affect the photometry. ...