Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-10-16
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
23 pages, 12 figures + 1 figure in appendix Accepted in A&A on 01 September 2009
Scientific paper
10.1051/0004-6361/200912742
A complete sample of 33 sources believed to be starbursts ("5.8micron-peakers") was selected in the (0.5 sq. deg.) J1046+56 field with selection criteria F_(24micron)>400muJy, the presence of a redshifted stellar emission peak at 5.8um, and r'(Vega)>23. 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 160micron and 70micron 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 4sigma detections, and nine were tentatively detected at the 3sigma level. Because of its 24micron selection, our sample shows systematically lower F_(1.2mm)/F_(24micron) 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 T_(dust)=37+/-8K, L_(FIR)=2.5x10^{12}Lo, and SFR=450Mo/yr. The FIR-radio correlation provides another estimate of L_(FIR) for each source, with an average value of 4.1x10^{12}Lo; 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
Baker Andrew Jordan
Beelen Alexander
Berta Stefano
Biggs Andy
de Breuck Carlos
No associations
LandOfFree
Multi-wavelength properties of Spitzer-selected starbursts at z~2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multi-wavelength properties of Spitzer-selected starbursts at z~2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-wavelength properties of Spitzer-selected starbursts at z~2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-123813