2009A&A...508..117F


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET19:05:58

2009A&A...508..117F - Astronomy and Astrophysics, volume 508, 117-132 (2009/12-2)

Multi-wavelength properties of Spitzer selected starbursts at z∼2.

FIOLET N., OMONT A., POLLETTA M., OWEN F., BERTA S., SHUPE D., SIANA B., LONSDALE C., STRAZZULLO V., PANNELLA M., BAKER A.J., BEELEN A., BIGGS A., DE BREUCK C., FARRAH D., IVISON R., LAGACHE G., LUTZ D., TACCONI L.J. and ZYLKA R.

Abstract (from CDS):

Wide-field Spitzer surveys allow identification of thousands of potentially high-z submillimeter galaxies (SMGs) through their bright 24µm emission and their mid-IR colors. We want to determine the average properties of such z∼2 Spitzer-selected SMGs by combining millimeter, radio, and infrared photometry for a representative IR-flux (λrest∼8µm) limited sample of SMG candidates.A complete sample of 33 sources believed to be starbursts (``5.8µm-peakers'') was selected in the (0.5deg2) J1046+56 field with selection criteria F24µm400µJy, the presence of a redshifted stellar emission peak at 5.8µm, and r'Vega23. The field, part of the SWIRE Lockman Hole field, benefits from very deep VLA/GMRT 20cm, 50cm, and 90cm radio data (all 33 sources are detected at 50cm), and deep 160µm and 70µm Spitzer data. The 33 sources, with photometric redshifts ∼1.5-2.5, were observed at 1.2mm with IRAM-30m/MAMBO to an rms ∼0.7-0.8mJy in most cases. Their millimeter, radio, 7-band Spitzer, and near-IR properties were jointly analyzed. The entire sample of 33 sources has an average 1.2mm flux density of 1.56±0.22mJy and a median of 1.61mJy, so the majority of the sources can be considered SMGs. Four sources have confirmed 4σ detections, and nine were tentatively detected at the 3σ level. Because of its 24µm selection, our sample shows systematically lower F1.2mm/F24µm flux ratios than classical SMGs, probably because of enhanced PAH emission. A median FIR SED was built by stacking images at the positions of 21 sources in the region of deepest Spitzer coverage. Its parameters are Tdust=37±8K, LFIR=2.5x1012L, and SFR=450M/yr. The FIR-radio correlation provides another estimate of LFIR for each source, with an average value of 4.1x1012L; however, this value may be overestimated because of some AGN contribution. Most of our targets are also luminous star-forming BzK galaxies which constitute a significant fraction of weak SMGs at 1.7≲z≲ 2.3. Spitzer 24µm-selected starbursts and AGN-dominated ULIRGs can be reliably distinguished using IRAC-24µm SEDs. Such ``5.8µm-peakers'' with F24µm>400µJy have LFIR>1012L. They are thus z∼2 ULIRGs, and the majority may be considered SMGs. However, they have systematically lower 1.2mm/24µm flux density ratios than classical SMGs, warmer dust, comparable or lower IR/mm luminosities, and higher stellar masses. About 2000-3000 ``5.8µm-peakers'' may be easily identifiable within SWIRE catalogues over 49deg2.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: starburst - galaxies: active - infrared: galaxies - submillimeter - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/A+A/508/117): table1.dat table4.dat table5.dat>

Nomenclature: Table 1: [FOP2009] L-NN (Nos L-1 to L-33).

CDS comments: Fig.9 IRAS 20551-4850 is a probable misprint for IRAS 20551-4250.

Simbad objects: 43

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Number of rows : 43

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5429 6
2 SWIRE J104351.16+590057.9 SBG 10 43 51.22 +59 00 58.0           ~ 4 0
3 SWIRE J104357.61+584921.5 SBG 10 43 57.61 +58 49 21.5           ~ 1 0
4 SWIRE J104409.98+584055.9 SBG 10 44 09.98 +58 40 55.9           ~ 2 0
5 SWIRE J104425.97+584024.0 SBG 10 44 25.99 +58 40 23.6           ~ 2 0
6 SWIRE J104427.53+584309.8 SBG 10 44 27.53 +58 43 09.8           ~ 4 0
7 SWIRE J104430.24+590701.6 SBG 10 44 30.32 +59 07 01.7           ~ 2 0
8 [MEH2010] LHN0 SBG 10 44 30.63 +58 55 18.4           ~ 4 0
9 SWIRE J104439.98+591240.4 SBG 10 44 39.98 +59 12 40.4           ~ 1 0
10 SWIRE J104440.25+585928.4 SBG 10 44 40.25 +58 59 28.6           ~ 4 0
11 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 758 0
12 SWIRE J104549.75+591903.5 SBG 10 45 49.67 +59 19 03.2           ~ 3 0
13 [OM2008] 813 SBG 10 45 56.93 +58 53 18.8           ~ 9 0
14 SWIRE J104601.78+590916.9 SBG 10 46 01.78 +59 09 16.9           ~ 5 0
15 SWIRE J104602.09+592003.1 SBG 10 46 02.09 +59 20 03.1           ~ 1 0
16 [OM2008] 1222 SBG 10 46 38.67 +58 56 12.5           ~ 8 0
17 SWIRE J104656.47+590235.5 SBG 10 46 56.49 +59 02 35.4           ~ 6 0
18 SWIRE J104702.82+591836.9 SBG 10 47 02.82 +59 18 36.9           ~ 1 0
19 SWIRE J104704.97+592332.3 SBG 10 47 04.97 +59 23 32.3           ~ 7 0
20 SWIRE J104706.82+585848.2 SBG 10 47 06.79 +58 58 48.1           ~ 2 0
21 SWIRE J104708.79+590627.2 SBG 10 47 08.81 +59 06 27.3           ~ 3 0
22 [MEH2010] LHN16 SBG 10 47 17.96 +59 02 31.8           ~ 5 0
23 SWIRE J104718.63+584318.1 SBG 10 47 18.63 +58 43 18.1           ~ 2 0
24 SWIRE J104720.49+591043.6 SBG 10 47 20.51 +59 10 43.2           ~ 3 0
25 [OM2008] 1569 SBG 10 47 26.43 +58 52 13.3           ~ 4 0
26 SWIRE J104732.10+585127.1 SBG 10 47 32.18 +58 51 26.9           ~ 2 0
27 SWIRE J104738.32+591010.0 SBG 10 47 38.32 +59 10 10.0           ~ 8 0
28 [MEH2010] LHN25 SBG 10 47 44.06 +59 06 24.9           ~ 3 0
29 [BLS2007] LH-577220 SBG 10 47 44.61 +59 14 13.0           ~ 5 0
30 SWIRE J104757.59+590451.7 SBG 10 47 57.59 +59 04 51.7           ~ 1 0
31 SWIRE J104807.86+591119.5 SBG 10 48 07.88 +59 11 20.2           ~ 2 0
32 SWIRE J104816.81+584658.5 SBG 10 48 16.81 +58 46 58.5           ~ 1 0
33 SWIRE J104830.71+585659.3 SBG 10 48 30.71 +58 56 59.3           ~ 2 0
34 SWIRE J104841.00+590056.8 SBG 10 48 41.00 +59 00 56.8           ~ 1 0
35 SWIRE J104848.23+585059.3 SBG 10 48 48.23 +58 50 59.3           ~ 2 0
36 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1844 1
37 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 953 1
38 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1818 3
39 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 318 0
40 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2727 4
41 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 402 2
42 NAME Superantennae Sy2 19 31 21.4252803168 -72 39 21.448768732   17.39 16.37 14.65   ~ 279 2
43 ESO 286-19 LIN 20 58 26.8182983654 -42 38 59.418569678   14.79 14.79 14.20   ~ 253 0

    Equat.    Gal    SGal    Ecl

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2021.03.04-19:05:58

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