J/MNRAS/383/479 Radio obs. of optically obscured galaxies (Magliocchetti+, 2008)
The radio properties of optically obscured Spitzer sources.
Magliocchetti M., Andreani P., Zwaan M.A.
<Mon. Not. R. Astron. Soc., 383, 479-496 (2008)>
=2008MNRAS.383..479M 2008MNRAS.383..479M
ADC_Keywords: Galaxies, IR ; Infrared sources ; Radio sources
Keywords: galaxies: active - galaxies: starburst - cosmology: observations -
infrared: galaxies - radio continuum: galaxies
Abstract:
This paper analyses the radio properties of a subsample of optically
obscured (R≥25.5) galaxies observed at 24um by the Spitzer Space
Telescope within the First Look Survey. Ninety-six F24um≥0.35mJy
objects out of 510 are found to have a radio counterpart at 1.4GHz,
610MHz or at both frequencies, respectively, down to ∼40 and ∼200uJy.
IRAC photometry sets the majority of them in the redshift interval
z~=[1-3] and allows for a broad distinction between active galactic
nucleus (AGN) dominated galaxies (∼47 per cent of the radio-identified
sample) and systems powered by intense star formation (∼13 per cent),
the remaining objects being impossible to classify. The percentage of
radio identifications is a strong function of 24-um flux: almost all
sources brighter than F24um∼2mJy are endowed with a radio flux at
both 1.4GHz and 610MHz, while this fraction drastically decreases by
lowering the 24-um flux level.
Description:
Radio counterparts to optically obscured Spitzer sources were searched
by cross-correlating the catalogue obtained by Magliocchetti et al.
(2007MNRAS.375.1121M 2007MNRAS.375.1121M), with those provided by Condon et al. (2003,
Cat. J/AJ/125/2411), Morganti et al. (2004, Cat. J/A+A/424/371) and
Garn et al. (2007, Cat. J/MNRAS/376/1251).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 89 96 Radio counterparts to R>25.5 Spitzer sources
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See also:
J/AJ/125/2411 : SIRTF First-Look Survey (Condon+, 2003)
J/A+A/424/371 : 1.4GHz First Look Survey (FLS) (Morganti+, 2004)
J/AJ/131/2859 : Extragalactic First Look Survey: 24um data (Fadda+, 2006)
J/MNRAS/376/1251 : 610MHz observations of Spitzer XFLS (Garn+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Galaxy name (JHHMMSS.s+DDMMSS)
18- 21 F4.2 mJy F24 MIPS flux at 24um from Fadda et al.
(2006, Cat. J/AJ/131/2859)
23 A1 --- l_F3.6 Limit flag on F3.6
24- 30 F7.2 uJy F3.6 IRAC flux at 3.6um (1)
32 A1 --- l_F4.5 Limit flag on F4.5
33- 39 F7.2 uJy F4.5 IRAC flux at 4.5um (1)
41 A1 --- l_F5.8 Limit flag on F5.8
42- 48 F7.2 uJy F5.8 IRAC flux at 5.8um (1)
50 A1 --- l_F8 Limit flag on F8
51- 57 F7.2 uJy F8 IRAC flux at 8um (1)
59 A1 --- l_F1.4G Limit flag on F1.4G
60- 64 F5.2 mJy F1.4G Flux at 1.4GHz
65 A1 --- r_F1.4G [M] Reference for F1.4G (2)
67- 71 F5.2 mJy F610M ?=- Flux at 610MHz from Garn et al.
(2007, Cat. J/MNRAS/376/1251)
72 A1 --- n_F1.4G [*] Note on radio flux (3)
74- 78 A5 --- Class Class (4)
82 I1 --- zt [1/5] Likely redshift range (5)
84 A1 -- l_alpha Limit flag on alpha
85- 89 F5.2 --- alpha ?=- Radio spectral index
(S(ν)∝ν-α)
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Note (1): IRAC data from Lacy et al. (2005ApJS..161...41L 2005ApJS..161...41L)
Note (2): All radio data at 1.4 GHz are taken from Condon et al. (2003,
Cat. J/AJ/125/2411), except for those sources labelled with M, where
the radio information comes from Morganti et al. (2004, Cat.
J/A+A/424/371)
Note (3): In all cases but J171143.9+600741 and J172005.0+592430 (marked
with *) the reported radio fluxes correspond to the single radio
source closest to the centre of 24-um emission
Note (4): Class as follows:
SB0 = star forming, F24≥0.6; F8/F24<0.1
LI = local interloper
AGN0? = AGN0 ?
AGN0 = AGN, F24≥0.6; F8/F24≥0.1
AGN1 = AGN, F24<0.6; F4.5/F3.6≥4.5/3.6
UNCL = unclassified, F24<0.6; F4.5/F3.6<4.5/3.6 or no IRAC information
Note (5): Likely redshift range as follows:
1 = 0≤z≤1
2 = 1≤z≤1.5
3 = 1.5≤z≤3
4 = pure β>1 Power-Law (PL) AGN SED; no redshift assignment
is possible in these cases
5 = no redshift estimate was possible in that case
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-Jan-2009