Radio-optical properties of extragalactic populations in the VIPERS Survey

(1)

2015

Publication Year

2020-11-17T14:39:17Z

Acceptance in OA@INAF

Radio-optical properties of extragalactic populations in the VIPERS Survey

Title

ZANICHELLI, Alessandra; Gregorini, Loretta; BONDI, MARCO; VIPERS Team

Authors

10.1017/S1743921314010138

DOI

http://hdl.handle.net/20.500.12386/28385

Handle

PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION

Series

vol. 10, S309

(2)

Galaxies in 3D across the Universe Proceedings IAU Symposium No. 309, 2014

B. L. Ziegler, F. Combes, H. Dannerbauer, M. Verdugo, eds.

c

International Astronomical Union 2015

doi:10.1017/S1743921314010138

Radio-optical properties of extragalactic

populations in the VIPERS Survey

A. Zanichelli

1

, L. Gregorini

1,2

, M. Bondi

1

and the VIPERS Team

∗ 1 _INAF _{Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy,}

2

Dipartimento di Fisica e Astronomia, Universit`a di Bologna, via Ranzani 1, I-40126 Bologna, Italy

Abstract. The radio and optical characteristics of faint radio sources are investigated thanks to

the VIPERS spectroscopic and photometric data, and radio data from the VLA FIRST survey at 1.4 GHz.

The VIMOS Public Extragalactic Redshift Survey (VIPERS, Guzzo et al., 2014) is an ESO Large Program to measure the redshifts of 100.000 galaxies over∼ 24 deg2 of sky in the CFHTLS regions. Based on color pre-selection to remove most of the stars and of galaxies at z<0.5, VIPERS is spectroscopically limited to magnitude IA B <22.5

and covers the redshift range 0.5< z <1.2. A large dataset of ancillary data in various photometric bands is available. The ﬁrst public data release of∼ 57.000 VIPERS redshifts has been done in October 2013 (see http://vipers.inaf.it).

Thanks to VIPERS spectral type classification, the average properties of galaxy types at different cosmic epochs and radio fluxes can be investigated through optical identi-fications with radio sources in the VLA FIRST catalog (White et al., 1997). For non radio-detected VIPERS galaxies, the stacking of FIRST radio maps allows to push the analysis at very faint radio flux levels.

From the FIRST catalog we classiﬁed 1880 radio sources with S1.4G H z 0.77 mJy over

the VIPERS area. Among these, 1117 have an optical counterpart in the VIPERS photo-metric dataset down to IA B= 24.0,∼80% having either a spectroscopic or a good-quality

photometric redshift. The investigation of their radio–optical properties is ongoing. In parallel, we are conducting the radio stacking analysis for VIPERS galaxies that show no radio emission in the FIRST survey . A preliminary dataset of∼46000 VIPERS galaxies with good-quality spectroscopic redshift and type classiﬁcation has been used. First tests show that late spirals/irregulars are detected at increasing redshift, as ex-pected if radio emission in these galaxies is dominated by star formation, while red ellipticals/early spirals are detected at any z, suggesting a probable diﬀerent origin for radio emission.

The final sample will include the full VIPERS spectroscopic set, allowing us to investi-gate the different properties of the optical classes at very faint flux limits compared with that of radio–emitting galaxies, and to follow their evolution with redshift.

References

Guzzo, L., et al. 2014, A&A 566, 108 White, R.,L., et al. 1997, ApJ 475, 479

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available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S1743921314010138