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J/ApJ/723/1110         MIPS 24um observations of the HDFS         (Huynh+, 2010)

MIPS 24 µm observations of the Hubble Deep Field South: probing the IR-radio correlation of galaxies at z>1. Huynh M.T., Gawiser E., Marchesini D., Brammer G., Guaita L. <Astrophys. J., 723, 1110-1118 (2010)> =2010ApJ...723.1110H
ADC_Keywords: Photometry, infrared ; Galaxies, IR ; Radio sources Keywords: galaxies: evolution - galaxies: formation - galaxies: starburst Abstract: We present MIPS 24um observations of the Hubble Deep Field South taken with the Spitzer Space Telescope. The resulting image is 254arcmin2 in size and has a sensitivity ranging between ∼12 and ∼30uJy rms, with a median sensitivity of ∼20uJy rms. A total of 495 sources have been catalogued with a signal-to-noise ratio greater than 5σ. The source catalog is presented as well as source counts which have been corrected for completeness and flux boosting. The IR sources are then combined with MUSYC optical/NIR and ATHDFS radio observations to obtain redshifts and radio flux densities of the sample. We use the IR/radio flux density ratio (q24) to explore the IR-radio correlation for this IR sample and find q24=0.71±0.31 for sources detected in both IR and radio. The results are extended by stacking IR sources not detected in the radio observations and we derive an average q24 for redshift bins between 0<z<2.5. We find that the high-redshift (z>1) sources have an average q24 ratio which is better fit by local LIRG SEDs rather than local ULIRG SEDs, indicating that high-redshift ULIRGs differ in their IR/radio properties. So, ULIRGs at high-redshift have SEDs different from those found locally. Infrared-faint radio sources are examined, and while nine radio sources do not have an MIPS detection and are therefore radio-loud active galactic nuclei (AGNs), only one radio source has an extreme IRAC 3.6um to radio flux density ratio indicating it is a radio-loud AGN at z>1. Description: The MIPS 24um observations of the HDF-S were carried out over two campaigns. The first was in 2004 as part of the guaranteed time observations (GTOs; PI: Fazio) and the second in 2007 Cycle 3 observations (PID 30873, PI: Labbe). The radio observations of the HDF-S were made between 1998 and 2001 with the Australia Telescope Compact Array using all four available frequency bands. Between 100 and 300hr of observing at each band yielded images at 1.4, 2.5, 5.2, and 8.7GHz with maximum sensitivities of ∼10uJy rms (Huynh et al. 2005, Cat. J/AJ/130/1373; 2007, Cat. J/AJ/133/1331). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 70 495 The MIPS 24µm catalog table4.dat 75 9 Summary of radio Sources that have no MIPS 24um counterpart and hence are candidate infrared-faint radio sources
See also: J/ApJS/189/270 : MUSYC optical imaging in ECDF-S (Cardamone+, 2010) J/AJ/135/2470 : Radio observations of the HDFS region. IV. (Huynh+, 2008) J/AJ/133/1331 : Observation of HDFS at 2.5, 5.2, and 8.7GHz (Huynh+, 2007) J/ApJ/655/51 : HDFS IRAC observations of 2<z<3.5 galaxies (Wuyts+, 2007) J/AJ/134/1103 : MUSYC deep near-infrared imaging (Quadri+, 2007) J/AJ/132/2409 : Deep ATLAS radio observations of CDFS (Norris+, 2006) J/A+A/452/119 : EIS: infrared observations of CDF-S and HDF-S (Olsen+, 2006) J/ApJS/162/1 : MUSYC: optical source catalog (Gawiser+, 2006) J/AJ/130/1373 : Radio observations of the HDFS region. II (Huynh+, 2005) J/A+A/440/61 : FORS spectroscopy of HDFS galaxies (Rigopoulou+, 2005) J/AJ/125/1107 : Ultra-deep near-IR observation in HDF-S (Labbe+, 2003) J/A+A/375/1 : IR observations of CDF + HDF-South (Saracco+, 2001) J/A+AS/145/111 : HDF-South catalogue of galaxies (Volonteri+, 2000) J/ApJ/538/493 : HDF-South NICMOS field (Yahata+, 2000) J/AJ/120/2206 : NTT, HDF-S and HDF-N photometric redshifts (Fontana+, 2000) J/AJ/120/2747 : HDF-South WFPC2 observations (Casertano+, 2000) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- --- [MUSYC_MIPS] 11- 27 A17 --- ID Source identification (JHHMMSS.s+DDMMSS) 29- 38 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 40- 49 F10.6 deg DEdeg Declination in decimal degrees (J2000) 51- 58 F8.1 uJy S24um Spitzer/MIPS 24 micron flux density 60- 63 F4.1 uJy e_S24um Uncertainty in S24um (formal error from APEX) 65- 70 F6.1 --- S/N Signal-to-noise ratio of the source
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 7 A7 --- --- [ATHDFS_] 8- 23 A16 --- ATHDFS Radio identification (JHHMMSS.s+DDMMSS) (1) 25- 27 I3 uJy S24um Spitzer/MIPS 24um flux, 5σ limit 29- 33 F5.3 mJy S1.4 ATCA 1.4GHz flux density 35 A1 --- l_S3.6 Limit flag on S3.6 36- 41 F6.2 uJy S3.6 ? Spitzer/IRAC 3.6um flux density (from Marchesini et al., 2009ApJ...701.1765M) 42 A1 --- f_S3.6 [cd] not observed with IRAC (2) 44 A1 --- l_q24 Limit flag on q24 45- 49 F5.2 --- q24 IR/radio flux density ratio (q24=log(S24um/S1.4GHz)) 51 A1 --- l_R/IR Limit flag on R/IR 52- 56 F5.1 --- R/IR ? Radio-to-IRAC flux density ratio (S1.4GHz/S3.6um) 57 A1 --- f_R/IR [cd] not observed with IRAC (2) 59- 63 F5.3 --- zph ? Photometric redshift 64 A1 --- f_zph [b] undetected in optical (2) 66- 70 F5.2 --- alpha ? Radio spectral index (2.5GHz-1.4GHz) from Huynh et al. (2007, Cat. J/AJ/133/1331) and S∝να 72- 75 F4.2 --- e_alpha ? alpha uncertainty
Note (1): Only ATHDFS_J223205.9-603857 is faint enough at 3.6um to meet the original infrared-faint radio source (IFRS) definition of Norris et al. (2006, Cat. J/AJ/132/2409). All of these sources have q24 values suggestive of radio-loud AGNs. Note (2): Flag as follows: b = Not detected in MUSYC optical imaging. c = IRAC image of source has artifacts, so photometry is inaccurate. d = Out of IRAC coverage.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Jul-2012
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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