We present the optical and infrared identifications of the 266 radio sources detected at 20 cm with the Very Large Array in the Chandra Deep Field-South. Using deep i-band Advanced Camera for Surveys, R-band Wide Field Imager, K-band SOFI NTT, K-band ISAAC VLT and Spitzer imaging data, we are able to find reliable counterparts for 254 (similar to 95%) VLA sources. Twelve radio sources remain unidentified, and three of them are "empty fields.'' Using literature and our own data we are able to assign redshifts to 186 (similar to 70%) radio sources: 108 are spectroscopic redshifts and 78 are reliable photometric redshifts. Based on the rest-frame colors and morphological distributions of the host galaxies, we find evidences for a change in the submillijansky radio source population: (1) above approximate to 0.08 mJy early-type galaxies are dominating and (2) at flux densities below approximate to 0.08 mJy, starburst galaxies become dominant.

THE VLA SURVEY OF THE CHANDRA DEEP FIELD-SOUTH. II. IDENTIFICATION AND HOST GALAXY PROPERTIES OF SUBMILLIJANSKY SOURCES

ROSATI, Piero;
2008

Abstract

We present the optical and infrared identifications of the 266 radio sources detected at 20 cm with the Very Large Array in the Chandra Deep Field-South. Using deep i-band Advanced Camera for Surveys, R-band Wide Field Imager, K-band SOFI NTT, K-band ISAAC VLT and Spitzer imaging data, we are able to find reliable counterparts for 254 (similar to 95%) VLA sources. Twelve radio sources remain unidentified, and three of them are "empty fields.'' Using literature and our own data we are able to assign redshifts to 186 (similar to 70%) radio sources: 108 are spectroscopic redshifts and 78 are reliable photometric redshifts. Based on the rest-frame colors and morphological distributions of the host galaxies, we find evidences for a change in the submillijansky radio source population: (1) above approximate to 0.08 mJy early-type galaxies are dominating and (2) at flux densities below approximate to 0.08 mJy, starburst galaxies become dominant.
2008
Mainieri, V; Kellermann, Ki; Fomalont, Eb; Miller, N; Padovani, P; Rosati, Piero; Shaver, P; Silverman, J; Tozzi, P; Bergeron, J; Hasinger, G; Norman, C; Popesso, P.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1853939
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 36
  • ???jsp.display-item.citation.isi??? 36
social impact