J/MNRAS/439/1556 ACT high significance 148 and 218GHz sources (Marsden+, 2014)
The Atacama Cosmology Telescope: dusty star-forming galaxies and active
galactic nuclei in the Southern survey.
Marsden D., Gralla M., Marriage T.A., Switzer E.R., Partridge B.,
Massardi M., Morales G., Addison G., Bond J.R., Crichton D., Das S.,
Devlin M., Dunner R., Hajian A., Hilton M., Hincks A., Hughes J.P.,
Irwin K., Kosowsky A., Menanteau F., Moodley K., Niemack M., Page L.,
Reese E.D., Schmitt B., Sehgal N., Sievers J., Staggs S., Swetz D.,
Thornton R., Wollack E.
<Mon. Not. R. Astron. Soc., 439, 1556-1574 (2014)>
=2014MNRAS.439.1556M 2014MNRAS.439.1556M
ADC_Keywords: Surveys ; Radio sources ; Galaxy catalogs
Keywords: methods: numerical - surveys - galaxies: active -
galaxies: high-redshift
Abstract:
We present a catalogue of 191 extragalactic sources detected by the
Atacama Cosmology Telescope (ACT) at 148 and/or 218GHz in the 2008
Southern survey. Flux densities span 14 -1700mJy, and we use source
spectral indices derived using ACT-only data to divide our sources
into two subpopulations: 167 radio galaxies powered by central active
galactic nuclei (AGN) and 24 dusty star-forming galaxies (DSFGs). We
cross-identify 97 percent of our sources (166 of the AGN and 19 of the
DSFGs) with those in currently available catalogues. When combined
with flux densities from the Australia Telescope 20GHz survey and
follow-up observations with the Australia Telescope Compact Array, the
synchrotron-dominated population is seen to exhibit a steepening of
the slope of the spectral energy distribution from 20 to 148GHz, with
the trend continuing to 218GHz. The ACT dust-dominated source
population has a median spectral index, α148-218, of
3.7+0.62-0.86, and includes both local galaxies and sources with
redshift around 6. Dusty sources with no counterpart in existing
catalogues likely belong to a recently discovered subpopulation of
DSFGs lensed by foreground galaxies or galaxy groups.
Description:
The ACT experiment (Swetz et al., 2011ApJS..194...41S 2011ApJS..194...41S) is situated on
the slopes of Cerro Toco in the Atacama Desert of Chile at an
elevation of 5190m. ACT's latitude gives access to both the northern
and southern celestial hemispheres. Observations occurred
simultaneously in three frequency bands, at 148GHz (2.0mm), 218GHz
(1.4mm) and 277GHz (1.1mm) with angular resolutions of roughly 1.4 ,
1.0 and 0.9-arcmin, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 156 191 ACT high significance 148 and 218GHz
Extragalactic Source Catalog
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See also:
J/ApJ/731/100 : 148GHz ACT extragalactic sources catalog (Marriage+, 2011)
J/MNRAS/402/2403 : Australia Tel. 20GHz Survey Catalog, AT20G (Murphy+, 2010)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [ACT-S]
7- 20 A14 --- ACT-S ACT-S designation (JHHMMSS+DDMMSS)
21 A1 --- n_ACT-S [d] No cross-identification (1)
23- 24 I2 h RAh Right ascension (J2000)
26- 27 I2 min RAm Right ascension (J2000)
29- 32 F4.1 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 44 F4.1 arcsec DEs Declination (J2000)
46- 50 F5.1 --- S/N1 [1.7/533] Signal-to-noise ratio at 148GHz
52- 57 F6.1 mJy S148m [4/1721] Flux density as measured directly from
the ACT 148GHz map
59- 64 F6.1 mJy S148 [3/1719] Deboosted flux density at 148GHz
66- 69 F4.1 mJy E_S148 Error on S148 (upper value)
71- 74 F4.1 mJy e_S148 Error on S148 (lower value)
76- 80 F5.1 --- S/N2 [1.8/302] Signal-to-noise ratio at 218GHz
82- 87 F6.1 mJy S218m [6/1420] Flux density as measured directly from
the ACT 218GHz map
89- 94 F6.1 mJy S218 [6/1420] Deboosted flux density at 218GHz
96- 99 F4.1 mJy E_S218 Error on S218 (upper value)
101-104 F4.1 mJy e_S218 Error on S218 (lower value)
106-109 F4.1 --- alpham Raw spectral index between 148 and 218GHz
(S(ν)∝να)
111-114 F4.1 --- alpha Deboosted spectral index between 148 and 218GHz
116-118 F3.1 --- E_alpha Error on alpha (upper value)
120-122 F3.1 --- e_alpha Error on alpha (lower value)
124-127 A4 --- Type [Sync Dust] Classification code (2)
129-142 A14 --- AT20G AT20G designation
143 A1 --- n_AT20G [*] Note on AT20G (1)
145-150 F6.1 mJy S20 ? Flux density at 20GHz
152-156 F5.1 mJy e_S20 ? rms uncertainty on S20
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Note (1): Notes as follows:
d = An ACT source not cross-identified with the catalogues specified
in Section 5
* = Name from 2010 November follow-up observation catalogue
Note (2): Classification codes are:
Sync = synchrotron-dominated sources (the vast majority of which are
cross-identified with radio catalogues)
Dust = low-redshift dust-dominated sources with IRAS counterparts
(typically ULIRGs) and dust-dominated sources also observed by
the South Pole Telescope (SPT), or with no cross-identification,
either shown or assumed to be high-redshift star-forming galaxies.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Dec-2014