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Investigations on the origin of the submillimeter extragalactic background light
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|Title:||Investigations on the origin of the submillimeter extragalactic background light|
|Issue Date:||Aug 2013|
|Publisher:||[Honolulu] : [University of Hawaii at Manoa], [August 2013]|
|Abstract:||In this thesis we describe single-dish far-infrared(FIR)/submillimeter observations with the revolutionary camera SCUBA-2 designed to resolve the FIR/submillimeter extragalactic background light (EBL) at 450 and 850 m into distinct sources (submillimeter galaxies; SMGs). We also describe arcsecond spatial resolution interferometric observations using the Submillimeter Array (SMA) on a selected sample of the faint 850 m SMGs from the single-dish samples which are highly-amplified by cluster lensings. These interferometric observations provide a much more detailed understanding of the nature of the SMGs.|
By combining SCUBA-2 data on two cluster lensing fields, A1689 and A370, and three blank fields, CDF-N, CDF-S, and COSMOS, we cover a wide flux range at both 450 and 850 m. The number counts are measured to a flux of around 1 (450 m) and 0.1 mJy (850 m). The depth at 450 m is unprecedented. 113:9+49:7 -28:4 Jy deg-2 of the 450 m and 37:3+21:1 -12:9 Jy deg-2 of the 850 m EBL are resolved, corresponding to almost full resolution of the EBL.
In the A370 field, we find a correlation between the Ks-band and the 850 m/20 cm flux ratio of the SCUBA-2 detected 850 m SMGs. A much higher fraction of 450 m SMGs have 20 cm and 850 m counterparts while the 850 m SMGs have fewer radio and 450 m counterparts. This implies a scenario where both 450 m and 20 cm emission preferentially select lower redshift dusty sources (z < 3), while 850 m emission traces a higher fraction of dusty sources at higher redshifts (z > 3). This is consistent with the conclusions drawn from comparing our number counts with the phenomenological models.
In the CDF-N field, a fraction of 9+12 -6 % of single-dish detected sources split into multiple fainter sources based on our SMA follow-up studies of the SCUBA-2 detected 850 m SMGs. Contrary to recent results from the literature, we find only a small difference between our original single-dish counts and the multiplicity corrected counts.
The SMA observations on one of the faint 850 m SMGs, A2390-3, nd no counterparts in the optical and infrared, indicating a heavily dust-enshrouded nature, and a non-detection in the radio implies that this source probably lies at a very high redshift. With welldetermined positions and gravitational amplifications, we accurately measure the intrinsic 850 m flux of A2390-3, which was poorly constrained due to large uncertainties on the amplifications caused by the poor resolution.
|Description:||Ph.D. University of Hawaii at Manoa 2013.|
Includes bibliographical references.
|Appears in Collections:||Ph.D. - Astronomy|
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