Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes

L. Bizzocchi; J. Afonso; E. Ibar; M. Grossi; C. Simpson; S. Chapman; M. J. Jarvis; H. Rottgering; R. P. Norris; J. Dunlop; R. J. Ivison; H. Messias; J. Pforr; M. Vaccari; N. Seymour; P. Best; E. Gonz; D.. Farrah; J.-S. Huang; M. Lacy

doi:10.1007/978-3-642-22795-0-10

Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes

L. Bizzocchi
, J. Afonso
, E. Ibar
, M. Grossi
, C. Simpson
, S. Chapman
, M. J. Jarvis
, H. Rottgering
, R. P. Norris
, J. Dunlop
, R. J. Ivison
, H. Messias
, J. Pforr
, M. Vaccari
, N. Seymour
, P. Best
, E. Gonz
, D.. Farrah
, J.-S. Huang
, M. Lacy

School of Science

Research output: Chapter in Book / Conference Paper › Conference Paper

Abstract

Ultra Steep Spectrum (USS) radio sources have been successfully used to select powerful radio sources at high redshifts (z > 2). Typically restricted to large-sky surveys and relatively bright radio flux densities, it has gradually become possible to extend the USS search to sub-mJy levels, thanks to the recent appearance of sensitive low-frequency radio facilities. Here we present a first detailed analysis of the nature of the faintest USS sources. By using GMRT and VLA radio observations of the Lockman Hole (LH) at 610MHz and 1.4GHz, a sample of 58 micro-Jansky USS sources is assembled. Deep infrared data at 3.6 and 4.5Î¼m from the Spitzer Extragalactic Representative Volume Survey (SERVS) is used to reliably identify counterparts for 48 (83%) of these sources, showing an average magnitude of [3.6]=19.7 mag(AB). Spectroscopic redshifts for 14 USS sources, together with photometric redshift estimates, improved by the use of the deep SERVS data, for a further 19 objects, show redshifts ranging from z =0.1 to z=2.8, peaking at zâˆ¼0.6 and tailing off at high redshifts.

Original language	English
Title of host publication	The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010
Publisher	Springer
Pages	97-100
Number of pages	4
ISBN (Print)	9783642227943
DOIs	https://doi.org/10.1007/978-3-642-22795-0-10
Publication status	Published - 2012
Event	JENAM (Conference) - Duration: 6 Sept 2010 → …

Publication series

Name
ISSN (Print)	1570-6591

Conference

Conference	JENAM (Conference)
Period	6/09/10 → …

Access to Document

10.1007/978-3-642-22795-0-10

Cite this

Bizzocchi, L., Afonso, J., Ibar, E., Grossi, M., Simpson, C., Chapman, S., Jarvis, M. J., Rottgering, H., Norris, R. P., Dunlop, J., Ivison, R. J., Messias, H., Pforr, J., Vaccari, M., Seymour, N., Best, P., Gonz, E., Farrah, D., Huang, J.-S., & Lacy, M. (2012). Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes. In The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010 (pp. 97-100). Springer. https://doi.org/10.1007/978-3-642-22795-0-10

Bizzocchi, L. ; Afonso, J. ; Ibar, E. et al. / Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes. The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010. Springer, 2012. pp. 97-100

@inproceedings{ef6a76cc18e34814b184a683c6b7d461,

title = "Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes",

abstract = "Ultra Steep Spectrum (USS) radio sources have been successfully used to select powerful radio sources at high redshifts (z > 2). Typically restricted to large-sky surveys and relatively bright radio flux densities, it has gradually become possible to extend the USS search to sub-mJy levels, thanks to the recent appearance of sensitive low-frequency radio facilities. Here we present a first detailed analysis of the nature of the faintest USS sources. By using GMRT and VLA radio observations of the Lockman Hole (LH) at 610MHz and 1.4GHz, a sample of 58 micro-Jansky USS sources is assembled. Deep infrared data at 3.6 and 4.5{\^I}¼m from the Spitzer Extragalactic Representative Volume Survey (SERVS) is used to reliably identify counterparts for 48 (83\%) of these sources, showing an average magnitude of [3.6]=19.7 mag(AB). Spectroscopic redshifts for 14 USS sources, together with photometric redshift estimates, improved by the use of the deep SERVS data, for a further 19 objects, show redshifts ranging from z =0.1 to z=2.8, peaking at z{\^a}ˆ¼0.6 and tailing off at high redshifts.",

author = "L. Bizzocchi and J. Afonso and E. Ibar and M. Grossi and C. Simpson and S. Chapman and Jarvis, \{M. J.\} and H. Rottgering and Norris, \{R. P.\} and J. Dunlop and Ivison, \{R. J.\} and H. Messias and J. Pforr and M. Vaccari and N. Seymour and P. Best and E. Gonz and D.. Farrah and J.-S. Huang and M. Lacy",

year = "2012",

doi = "10.1007/978-3-642-22795-0-10",

language = "English",

isbn = "9783642227943",

publisher = "Springer",

pages = "97--100",

booktitle = "The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010",

note = "JENAM (Conference) ; Conference date: 06-09-2010",

}

Bizzocchi, L, Afonso, J, Ibar, E, Grossi, M, Simpson, C, Chapman, S, Jarvis, MJ, Rottgering, H, Norris, RP, Dunlop, J, Ivison, RJ, Messias, H, Pforr, J, Vaccari, M, Seymour, N, Best, P, Gonz, E, Farrah, D, Huang, J-S & Lacy, M 2012, Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes. in The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010. Springer, pp. 97-100, JENAM (Conference), 6/09/10. https://doi.org/10.1007/978-3-642-22795-0-10

Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes. / Bizzocchi, L.; Afonso, J.; Ibar, E. et al.
The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010. Springer, 2012. p. 97-100.

Research output: Chapter in Book / Conference Paper › Conference Paper

TY - GEN

T1 - Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes

AU - Bizzocchi, L.

AU - Afonso, J.

AU - Ibar, E.

AU - Grossi, M.

AU - Simpson, C.

AU - Chapman, S.

AU - Jarvis, M. J.

AU - Rottgering, H.

AU - Norris, R. P.

AU - Dunlop, J.

AU - Ivison, R. J.

AU - Messias, H.

AU - Pforr, J.

AU - Vaccari, M.

AU - Seymour, N.

AU - Best, P.

AU - Gonz, E.

AU - Farrah, D..

AU - Huang, J.-S.

AU - Lacy, M.

PY - 2012

Y1 - 2012

N2 - Ultra Steep Spectrum (USS) radio sources have been successfully used to select powerful radio sources at high redshifts (z > 2). Typically restricted to large-sky surveys and relatively bright radio flux densities, it has gradually become possible to extend the USS search to sub-mJy levels, thanks to the recent appearance of sensitive low-frequency radio facilities. Here we present a first detailed analysis of the nature of the faintest USS sources. By using GMRT and VLA radio observations of the Lockman Hole (LH) at 610MHz and 1.4GHz, a sample of 58 micro-Jansky USS sources is assembled. Deep infrared data at 3.6 and 4.5Î¼m from the Spitzer Extragalactic Representative Volume Survey (SERVS) is used to reliably identify counterparts for 48 (83%) of these sources, showing an average magnitude of [3.6]=19.7 mag(AB). Spectroscopic redshifts for 14 USS sources, together with photometric redshift estimates, improved by the use of the deep SERVS data, for a further 19 objects, show redshifts ranging from z =0.1 to z=2.8, peaking at zâˆ¼0.6 and tailing off at high redshifts.

AB - Ultra Steep Spectrum (USS) radio sources have been successfully used to select powerful radio sources at high redshifts (z > 2). Typically restricted to large-sky surveys and relatively bright radio flux densities, it has gradually become possible to extend the USS search to sub-mJy levels, thanks to the recent appearance of sensitive low-frequency radio facilities. Here we present a first detailed analysis of the nature of the faintest USS sources. By using GMRT and VLA radio observations of the Lockman Hole (LH) at 610MHz and 1.4GHz, a sample of 58 micro-Jansky USS sources is assembled. Deep infrared data at 3.6 and 4.5Î¼m from the Spitzer Extragalactic Representative Volume Survey (SERVS) is used to reliably identify counterparts for 48 (83%) of these sources, showing an average magnitude of [3.6]=19.7 mag(AB). Spectroscopic redshifts for 14 USS sources, together with photometric redshift estimates, improved by the use of the deep SERVS data, for a further 19 objects, show redshifts ranging from z =0.1 to z=2.8, peaking at zâˆ¼0.6 and tailing off at high redshifts.

UR - http://handle.uws.edu.au:8081/1959.7/552148

UR - http://www.jenam2010.org/

U2 - 10.1007/978-3-642-22795-0-10

DO - 10.1007/978-3-642-22795-0-10

M3 - Conference Paper

SN - 9783642227943

SP - 97

EP - 100

BT - The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010

PB - Springer

T2 - JENAM (Conference)

Y2 - 6 September 2010

ER -

Bizzocchi L, Afonso J, Ibar E, Grossi M, Simpson C, Chapman S et al. Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes. In The Square Kilometre Array: Paving the Way for the New 21st Century Radio Astronomy Paradigm: Proceedings of Symposium 7 of JENAM 2010, Lisbon, Portugal, 6-10 September 2010. Springer. 2012. p. 97-100 doi: 10.1007/978-3-642-22795-0-10

Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes

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