J/A+A/467/565 z=1-3 ULIRGs from the Spitzer SWIRE survey (Berta+, 2007)
Keck spectroscopy of z=1-3 ULIRGs from the Spitzer SWIRE survey.
Berta S., Lonsdale C.J., Siana B., Farrah D., Smith H.E., Polletta M.C.,
Franceschini A., Fritz J., Perez-Fournon I., Rowan-Robinson M., Shupe D.,
Surace J.
<Astron. Astrophys., 467, 565-584 (2007)>
=2007A&A...467..565B 2007A&A...467..565B
ADC_Keywords: Galaxies, IR ; Redshifts ; Equivalent widths
Keywords: galaxies: distance and redshifts - galaxies: active -
galaxies: starburst - galaxies: high redshift -
galaxies: fundamental parameters - infrared: galaxies
Abstract:
High-redshift ultra luminous infrared galaxies contribute the bulk of
the cosmic IR background and are the best candidates for very massive
galaxies in formation at z>1.5.
It is necessary to identify the energy source for their huge
luminosities, starburst or AGN activity, in order to correctly
interpret the role of ULIRGs in galaxy evolution, and compute reliable
estimates of their star formation rates, stellar masses, and accretion
luminosities.
Description:
We present Keck/LRIS optical spectroscopy of 35 z≥1.4 luminous IR
galaxies in the Spitzer Wide-area Infra-Red Extragalactic survey
(SWIRE) northern fields (Lockman Hole, ELAIS-N1, ELAIS-N2). The
primary targets belong to the "IR-peak" class of galaxies, having the
1.6µm (restframe) stellar feature detected in the IRAC Spitzer
channels. The spectral energy distributions of the main targets are
thoroughly analyzed, by means of spectro-photometric synthesis and
multi-component fits (stars + starburst dust + AGN torus).
Observations were carried out in multi-object mode with the Low
Resolution Imaging Spectrometer (LRIS) at the Cassegrain focus of the
Keck-I telescope, during the nights of May 27th and 28th, 2006.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 10 Summary of observations
table2.dat 100 35 Data for IR-peak sources included in slit,
sorted by field
table3.dat 82 41 Detected lines for IR-peak targets,
sorted by mask (first night)
table4.dat 82 32 Detected lines for IR-peak targets,
sorted by mask (second night)
table5.dat 64 125 Results for first night
table6.dat 67 124 Results for second night
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See also:
II/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)
J/AJ/129/1198 : SDSS quasars in SWIRE ELAIS N1 field (Hatziminaoglou+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Mask Each mask is named with the identification
number of its primary target
12- 13 I2 h RAh Right ascension (Eq=J2000, Ep=J2006.4)
15- 16 I2 min RAm Right ascension (Eq=J2000, Ep=J2006.4)
18- 23 F6.3 s RAs Right ascension (Eq=J2000, Ep=J2006.4)
25 A1 --- DE- Declination sign (Eq=J2000, Ep=J2006.4)
26- 27 I2 deg DEd Declination (Eq=J2000, Ep=J2006.4)
29- 30 I2 arcmin DEm Declination (Eq=J2000, Ep=J2006.4)
32- 37 F6.3 arcsec DEs Declination (Eq=J2000, Ep=J2006.4)
39- 41 I3 deg PA Position angle
43- 46 F4.2 --- AM Air mass
48- 51 I4 s Texp Exposition time
53- 54 I2 ---- Nslits Number of slitlets
56 I1 --- Np Number of IR-peakers
58- 59 I2 --- Nz Number of measured spectroscopic redshifts
without accounting for serendipitous sources
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- [BLS2007] SWIRE object name
13- 22 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
24- 32 F9.6 deg DEdeg Declination in decimal degrees (J2000)
34- 38 F5.2 mag rmag r magnitude in VEGA system
40- 45 F6.2 uJy S3.6um Flux density at 3.6um
47- 52 F6.2 uJy S4.5um Flux density at 4.5um
54- 59 F6.2 uJy S5.8um ?=- Flux density at 5.8um
61- 65 F5.2 uJy S8.0um ?=- Flux density at 8.0um
67- 73 F7.2 uJy S24um ?=- Flux density at 24um
75- 82 A8 --- phClass Photometric classification (G1)
84- 88 A5 --- spClass Spectral class (G2)
90- 94 F5.3 --- zsp ?=- Spectrosocopic redshift
96-100 F5.3 --- zph Photometric redshift
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- [BLS2007] SWIRE object name
13- 16 I4 0.1nm blue1 ?=- Observed blue wavelength interval
17 A1 --- --- [-]
18- 21 I4 0.1nm blue2 ? Observed blue wavelength interval
23- 26 I4 0.1nm red1 ?=- Observed red wavelength interval
27 A1 --- --- [-]
28- 31 I4 0.1nm red2 ? Observed red wavelength interval
33- 39 F7.2 0.1nm lambda ?=- Wavelength
41 A1 --- l_EW Limit flag on EW
42- 48 F7.2 0.1nm EW ?=- Equivalent width
50 A1 --- l_FWHM Limit flag on FWHM
51- 56 F6.2 0.1nm FWHM ?=- Full width at half maximum, corrected for
the instrumental resolution
59- 76 A18 --- Lines Identification of detected spectral features
78- 82 F5.3 --- z ?=- Computed spectroscopic redshift
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Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- [BLS2007] SWIRE object name
12 A1 --- n_[BLS2007] [s] (s) indicates serendipitous sources
14- 22 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
24- 32 F9.6 deg DEdeg Declination in decimal degrees (J2000
34 I1 --- Nem ?=- Number of detected emission lines
36 I1 --- Nabs ?=- Number of detected absorption lines
38- 42 F5.3 --- zspec ?=- Measured spectroscopic redshift
44- 48 F5.3 --- zphot ?=- Estimated photometric redshift (1)
50- 58 A9 --- phClass Photometric classification (G1)
60- 67 A8 --- spClass Spectroscopic class (G2)
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Note (1): Photometric estimate of z, as obtained with the Hyper-z code
(Bolzonella et al., 2000A&A...363..476B 2000A&A...363..476B).
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Global notes:
Note (G1): Photometric flags mean the following:
pow = IRAC power-law sed
P3 = 5.8um peaker
P2 = 4.5um peaker
L = upper limit at 8.0um
R = radio source
X = X-ray source
Note (G2): Spectral class as follows:
BLAGN = broad line AGN
ELG = emission line galaxy
NLAGN = narrow-line AGN
SB = starburst diagnostics
ALG = absorption line only
nc = no continuum detected (but emission lines yes)
star = star
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Oct-2007