A SPITZER UNBIASED ULTRADEEP SPECTROSCOPIC SURVEY

被引:5
作者
Bertincourt, B. [1 ,2 ,3 ]
Helou, G. [3 ]
Appleton, P. [3 ,4 ]
Ogle, P. [3 ]
Lagache, G. [1 ,2 ]
Brooke, T. [3 ]
Smith, J-D. [5 ]
Sheth, K. [3 ]
Dale, D. [6 ]
Harwit, M. [7 ]
Puget, J-L. [1 ,2 ]
Roussel, H. [8 ]
机构
[1] Univ Paris 11, Inst Astrophys Spatiale, F-91405 Orsay, France
[2] CNRS, UMR 8617, F-91405 Orsay, France
[3] CALTECH, Spitzer Sci Ctr, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA
[4] CALTECH, NASA, Herschel Sci Ctr, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA
[5] Univ Arizona, Steward Observ, Tucson, AZ USA
[6] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA
[7] Cornell Univ, Ithaca, NY USA
[8] Univ Paris 06, UPMC, Inst Astrophys Paris, F-75014 Paris, France
关键词
galaxies: starburst; infrared: galaxies; ULTRALUMINOUS INFRARED GALAXIES; STAR-FORMING GALAXIES; ACTIVE GALACTIC NUCLEI; GOODS-NORTH FIELD; AREA ISO SURVEY; SPACE-TELESCOPE; LUMINOUS GALAXIES; MIDINFRARED SPECTROSCOPY; SUBMILLIMETER GALAXIES; MOLECULAR-HYDROGEN;
D O I
10.1088/0004-637X/705/1/68
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We carried out an unbiased, spectroscopic survey using the low-resolution module of the infrared spectrograph (IRS) onboard Spitzer targeting two 2.6 square arcminute regions in the GOODS-North field. The IRS was used in a spectral mapping mode with 5 hr of effective integration time per pixel. One region was covered between 14 and 21 mu m and the other between 20 and 35 mu m. We extracted spectra for 45 sources. About 84% of the sources have reported detections by GOODS at 24 mu m, with a median f(nu)( 24 mu m) similar to 100 mu Jy. All but one source are detected in all four IRAC bands, 3.6 to 8 mu m. We use a new cross-correlation technique to measure redshifts and estimate IRS spectral types; this was successful for similar to 60% of the spectra. Fourteen sources show significant polycyclic aromatic hydrocarbon emission, four mostly SiO absorption, eight present mixed spectral signatures (low PAH and/or SiO) and two show a single line in emission. For the remaining 17, no spectral features were detected. Redshifts range from z similar to 0.2 to z similar to 2.2, with a median of 1. IR luminosities are roughly estimated from 24 mu m flux densities, and have median values of 2.2 x 10(11)L(circle dot) and 7.5 x 10(11)L(circle dot) at z similar to 1 and z similar to 2, respectively. This sample has fewer active galactic nuclei than previous faint samples observed with the IRS, which we attribute to the fainter luminosities reached here.
引用
收藏
页码:68 / 88
页数:21
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