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J/ApJ/705/68        A Spitzer ultradeep survey (SUUSS)      (Bertincourt+, 2009)

A Spitzer Unbiased Ultradeep Spectroscopic Survey. Bertincourt B., Helou G., Appleton P., Ogle P., Lagache G., Brooke T., Smith J.-D., Sheth K., Dale D., Harwit M., Puget J.-L., Roussel H. <Astrophys. J., 705, 68-88 (2009)> =2009ApJ...705...68B
ADC_Keywords: Galaxies, spectra ; Galaxies, IR ; Redshifts Keywords: galaxies: starburst - infrared: galaxies Abstract: 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 5hr of effective integration time per pixel. One region was covered between 14 and 21um and the other between 20 and 35um. We extracted spectra for 45 sources. About 84% of the sources have reported detections by GOODS at 24um, with a median fν(24um)∼100uJy. All but one source are detected in all four IRAC bands, 3.6 to 8um. We use a new cross-correlation technique to measure redshifts and estimate IRS spectral types; this was successful for ∼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∼0.2 to z∼2.2, with a median of 1. IR luminosities are roughly estimated from 24um flux densities, and have median values of 2.2x1011L and 7.5x1011L at z∼1 and z∼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. Description: We chose to place the survey in the Hubble Deep Field North (HDF-N) covered in the infrared by Spitzer as part of the GOODS survey (Dickinson et al. 2003mglh.conf..324D; see also Cat. II/261). We observed a region in the HDF-N (Figure 1) with the Long-Low module of the IRS onboard Spitzer. Data are collected simultaneously from the two slits (LL1 and LL2) of the low-resolution module of the IRS, which cover different spectral ranges (14-21um and 20-38um).The survey was executed using eight Astronomical Observation Requests (AORs) for a total of 46.5hr of observation. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 51 45 Source extraction information table2.dat 80 45 Spitzer multi-wavelength data table4.dat 40 33 Cross-correlation analysis results
See also: II/261 : GOODS initial results (Giavalisco+, 2004) J/A+A/528/A35 : Infrared luminosity in GOODS fields (Magnelli+, 2011) J/ApJS/187/251 : Ultradeep Ks imaging in the GOODS-N (Wang+, 2010) J/ApJ/689/687 : GOODS-N spectroscopic survey (Barger+, 2008) J/ApJ/666/863 : GOODS MIPS early-type galaxies (Van Der Wel+, 2007) J/MNRAS/371/1891 : GOODS ELAIS-N1 24um flux densities (Rodighiero+, 2006) J/ApJ/653/1004 : Galaxies at 1.4≲z≲3.0 in GOODS-North Field (Reddy+, 2006) J/ApJ/634/128 : 16µm imaging around the HDF-N (Teplitz+, 2005) J/AJ/127/3121 : TKRS catalog of GOODS-North Field (Wirth+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [SUUSS] 7- 8 I2 --- SUUSS Source number 9 A1 --- f_SUUSS [d] Flag on SUUSS 9 (1) 11- 13 A3 --- Field Field (LL1: IRS low-resolution (20-35um) or LL2: IRS low-resolution (14-21um)) 15- 21 F7.3 deg RAdeg Spitzer/IRS right ascension in decimal degrees (J2000) 23- 29 F7.4 deg DEdeg Spitzer/IRS declination in decimal degrees (J2000) 31- 34 F4.1 --- S/N Signal to noise ratio estimation (2) 36- 39 F4.1 um S/Npk Maximum S/N (3) 41- 45 F5.2 um Wpk Wavelength at which the spectrum peaks (3) 47- 51 F5.2 um DelL Contracted spectral bandwidth over which the spectra have flux densities higher than 2σ
Note (1): d = SUUSS 9 is the [SIV] line source discussed in Section 4.3 which explains the low integrated S/N compared to its peak S/N. Note (2): S/N estimation when fluxes are integrated over the whole spectral range available (14-20um for LL2 and 20-35um for LL1). Note (3): Maximum S/N achieved in each spectrum and the wavelength at which it peaks. The spectra were smoothed using a comprehensive Hanning window over three channels in order to avoid contribution from any potentially remaining hot pixel value.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [SUUSS] 7- 8 I2 --- SUUSS Source number 10- 16 F7.3 deg RAdeg Spitzer/IRS right ascension in decimal degrees (J2000) 18- 24 F7.4 deg DEdeg Spitzer/IRS declination in decimal degrees (J2000) 26- 30 F5.2 uJy S3.6 ? Spitzer/IRAC 3.6um band flux (4) 32- 35 F4.2 uJy e_S3.6 ? S3.6 uncertainty 37- 41 F5.2 uJy S4.5 ? Spitzer/IRAC 4.5um band flux (4) 43- 46 F4.2 uJy e_S4.5 ? S4.5 uncertainty 48- 53 F6.3 uJy S5.8 ? Spitzer/IRAC 5.8um band flux (4) 55- 58 F4.2 uJy e_S5.8 ? S5.8 uncertainty 60- 65 F6.2 uJy S8.0 ? Spitzer/IRAC 8um band flux (4) 67- 70 F4.2 uJy e_S8.0 ? S8.0 uncertainty 72- 76 F5.1 uJy S24 ? Spitzer/MIPS 24um band flux (5) 78- 80 F3.1 uJy e_S24 ? S24 uncertainty
Note (4): IRAC photometry from GOODS legacy program, Dickinson et al. (2003mglh.conf..324D; see also Cat. II/261). Note (5): MIPS 24um photometry from GOODS-N, Chary (2007ASPC..380..375C).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [SUUSS] 7- 8 I2 --- SUUSS Source number 9 A1 --- f_SUUSS [c] no conclusive identification (1) 11 I1 --- Field [1/2] Field number (1: LL1 or 2: LL2) 13- 16 F4.2 --- zIRS ? Redshift from Spitzer/IRS 18- 21 F4.2 --- z ? Redshift from litterature 23 A1 --- r_z [P/S]? Code reference for z (2) 25- 34 A10 --- Template Template (galaxy prototype or PAH-class) 36- 40 A5 --- SpT Spectral characterisation (3)
Note (1): c = Sources with no conclusive identification from the cross-correlation method but for which we had ancilliary redshifts (same reference). Note (2): Code as follows: S = Spectroscopic redshifts from the Treasurey Keck Redshift Survey (Wirth et al. 2004, Cat. J/AJ/127/3121) P = Photometric redshifts from Caputi et al. (2006ApJ...637..727C) Note (3): Main spectral signature identified in the MIR spectra as follows: PAH = strong aromatic features, SiO = silicate absorption, Mixed = intermediate spectra, Line = the two special line-sources ([SIV] and [OIV]) discussed in Section 4.3.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 29-Nov-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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