J/A+A/635/A7 NOEMA redshift of bright Herschel galaxies (Neri+, 2020)
NOEMA redshift measurements of bright Herschel galaxies.
Neri R., Cox P., Omont A., Beelen A., Berta S., Bakx T., Lehnert M.,
Baker A.J., Buat V., Cooray A., Dannerbauer H., Dunne L., Dye S.,
Eales S., Gavazzi R., Harris A.J., Herrera C.N., Hughes D., Ivison R.,
Jin S., Krips M., Lagache G., Marchetti L., Messias H., Negrello M.,
Perez-Fournon I., Riechers D.A., Serjeant S., Urquhart S., Vlahakis C.,
Weiss A., van der Werf P., Yang C., Young A.J.
<Astron. Astrophys. 635, A7 (2020)>
=2020A&A...635A...7N 2020A&A...635A...7N (SIMBAD/NED BibCode)
ADC_Keywords: Millimetric/submm sources ; Galaxies, spectra ; Redshifts
Keywords: galaxies: high-redshift - galaxies: ISM -
gravitational lensing: strong - submillimeter: galaxies -
radio lines: ISM
Abstract:
Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we have
conducted a program to measure redshifts for thirteen bright galaxies
detected in the Herschel Astrophysical Large Area Survey (H-ATLAS)
with S(500)≥80mJy. We report reliable spectroscopic redshifts for
twelve individual sources, which are derived from scans of the 3 and
2-mm bands, covering up to 31GHz in each band, and are based on the
detection of at least two emission lines. The spectroscopic redshifts
are in the range between 2.08<z<4.05 with a median value of
z=2.9±0.6. The sources are unresolved or barely resolved on scales
of 10kpc. In one field, two galaxies with different redshifts were
detected. In two cases, the sources are found to be binary galaxies
with projected distances of ∼140kpc. The linewidths of the sources
are large, with a mean value for the full width at half maximum of
700±300km/s and a median of 800km/s. We analyze the nature of the
sources with currently available ancillary data to determine if they
are lensed or hyper-luminous (LFIR>1013L☉) galaxies. We also
present a re-analysis of the spectral energy distributions including
the continuum flux densities measured at 3 and 2-mm to derive overall
properties of the sources. Future prospects based on these efficient
measurements of redshifts of high-z galaxies using NOEMA are outlined,
including a comprehensive survey of all the brightest Herschel
galaxies.
Description:
Observational results are presented for 17 sub-millimeter bright
galaxies from the Herschel Astrophysical Large Area Survey. These
galaxies are HerBS-34, HerBS-43a, HerBS-43b, HerBS-44, HerBS-54,
HerBS-58, HerBS-70e, HerBS-70w, HerBS-79, HerBS-89a, HerBS-95e,
HerBS-95w, HerBS-113, HerBS-154, HerBS-173 HerBS-204e and HerBS-204w.
For each galaxies we provide spectroscopic redshifts (but for
HerBS-173 and HerBS-204), linewidths (but for HerBS-173) and
luminosities, 2-mm continuum fluxes and positions, infrared
luminosities, dust masses, dust temperatures, and spectral emissivity
indices.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 13 The Sample
table3.dat 174 18 Observed continuum positions and flux densities
table4.dat 83 15 Summary of emission line properties and
spectroscopic redshifts
table5.dat 68 16 *Infrared luminosities, dust masses, dust
temperatures, and spectral emissivity indices
table6.dat 47 14 *Physical properties of the galaxies
sp1/* . 14 Individual spectra
sp2/* . 17 Individual spectra
list.dat 122 18 List of fits files
fits/* . 18 Individual fits files
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Note on table5.dat: In order to derive the infrared luminosities, dust masses,
and temperatures of the sources, we modeled their SEDs using two different
approaches:
(i) a single-temperature MBB, following Berta et al. (2016A&A...587A..73B 2016A&A...587A..73B),
and (ii) the Draine & Li (2007ApJ...657..810D 2007ApJ...657..810D, hereafter DL07) dust models.
Note on table6.dat: The table assumes no differential lensing between the CO
and dust emission. The infrared luminosities and dust masses are those derived
using the MBB approach (see Table 5). The gas masses are estimated using
Eq. 2; see Sect. 4.5 and footnote of Table5 for details.
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Source HerBS name (HerBS-NNN) (1)
11- 26 A16 --- H-ATLAS H-ATLAS name (JHHMMSS.s+DDMMSS)
28- 31 F4.2 --- zph Photometric redshifts (2)
33- 37 F5.1 mJy S250 Herschel 250um flux density (1)
39- 41 F3.1 mJy e_S250 Herschel 250um flux density error (1)
43- 47 F5.1 mJy S350 Herschel 350um flux density (1)
49- 51 F3.1 mJy e_S350 Herschel 350um flux density error (1)
53- 57 F5.1 mJy S500 Herschel 500um flux density (1)
59- 61 F3.1 mJy e_S500 Herschel 500um flux density error (1)
63- 66 F4.1 mJy S850 SCUBA-2 850um flux density (2)
68- 70 F3.1 mJy e_S850 SCUBA-2 850um flux density error (2)
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Note (1): The source names and Herschel flux densities are from Bakx et al.
(2018MNRAS.473.1751B 2018MNRAS.473.1751B).
Note (2): The SCUBA-2 flux densities and photometric redshifts (zph) have been
updated from that paper based on a revision of the SCUBA-2 flux densities
(see text); further details are provided in Bakx et al. (in preparation).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Source HerBS name (HerBS-NNN or HerBS-NNNA)
12- 13 I2 h RAh Right ascension (J2000) (1)
15- 16 I2 min RAm Right ascension (J2000) (1)
18- 22 F5.2 s RAs Right ascension (J2000) (1)
23 A1 --- DE- Declination sign (J2000) (1)
24- 25 I2 deg DEd Declination (J2000) (1)
27- 28 I2 arcmin DEm Declination (J2000) (1)
30- 33 F4.1 arcsec DEs Declination (J2000) (1)
35- 38 F4.2 mJy S158.6GHz ? Flux density at 158.6GHz
40- 43 F4.2 mJy e_S158.6GHz ? rms uncertainty on S158.6GHz
45 A1 --- l_S149.0GHz Limit flag on S149.0GHz
46- 48 F3.1 mJy S149.0GHz ? Flux density at 149.0GHz
50- 52 F3.1 mJy e_S149.0GHz ? rms uncertainty on S149.0GHz
54- 57 F4.2 mJy S143.2GHz ? Flux density at 143.2GHz
59- 62 F4.2 mJy e_S143.2GHz ? rms uncertainty on S143.2GHz
64 A1 --- l_S133.5GHz Limit flag on S133.5GHz
65- 67 F3.1 mJy S133.5GHz ? Flux density at 133.5GHz
69- 71 F3.1 mJy e_S133.5GHz ? rms uncertainty on S133.5GHz
73 A1 --- l_S111.5GHz Limit flag on S111.5GHz
74- 77 F4.2 mJy S111.5GHz ? Flux density at 111.5GHz
79- 82 F4.2 mJy e_S111.5GHz ? rms uncertainty on S111.5GHz
84 A1 --- l_S103.7GHz Limit flag on S103.7GHz
85- 88 F4.2 mJy S103.7GHz ? Flux density at 103.7GHz
90- 93 F4.2 mJy e_S103.7GHz ? rms uncertainty on S103.7GHz
95- 98 F4.2 mJy S96.0GHz ? Flux density at 96.0GHz
100-103 F4.2 mJy e_S96.0GHz ? rms uncertainty on 96.0GHz
105 A1 --- l_S88.3GHz Limit flag on S88.3GHz
106-109 F4.2 mJy S88.3GHz ? Flux density at 88.3GHz
111-114 F4.2 mJy e_S88.3GHz ? rms uncertainty on SS88.3GHz
116-134 A19 --- FileName1 Name of spectrum file in subdirectory sp1 (2)
136-154 A19 --- FileName2 Name of spectrum file in subdirectory sp2 (2)
156-174 A19 --- FileName3 Name of spectrum file in subdirectory sp2 (2)
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Note (1): Positions are derived from the 2-mm continuum peaks, with the
exception of HerBS-173 and HerBS-204, whose positions are derived from the
stacked 3-mm continuum peaks (see Sect. 3.1 for further details).
See Section 3.1 for the continuum flux densities of the sources
HerBS-204 and HerBS-173. Note that for HerBS-70W and HerBS-95W, the flux
densities and upper limits were corrected for primary beam attenuation.
Note (2): spectrum file names are in the from HerBS-NNNa-line.dat,
where, for line, co32 = CO (3-2), co43 = CO (4-3), co54 = CO (5-4),
co65 = CO (6-5), ci = [CI] 3p1-3p0, and l103 = unidentified line.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Source HerBS name (HerBS-NNN or HerBS-NNNA)
11- 16 F6.4 --- zsp ? Spectroscopic redshift
18- 23 F6.4 --- e_zsp ? Spectroscopic redshift error
25- 28 I4 km/s DV Mean linewidth (FWHM) weighted by the peak
intensities of the detected CO
transitions, ΔV (1)
30- 32 I3 km/s e_DV Mean linewidth error
34- 36 F3.1 Jy.km/s F12CO(3-2) ? Line flux of 12CO(3-2)
38- 40 F3.1 Jy.km/s e_F12CO(3-2) ? Line flux of 12CO(3-2) error
42- 44 F3.1 Jy.km/s F12CO(4-3) ? Line flux of 12CO(4-3)
46- 48 F3.1 Jy.km/s e_F12CO(4-3) ? Line flux of 12CO(4-3) error
50- 53 F4.1 Jy.km/s F12CO(5-4) ? Line flux of 12CO(5-4)
55- 57 F3.1 Jy.km/s e_F12CO(5-4) ? Line flux of 12CO(5-4) error
59- 61 F3.1 Jy.km/s F12CO(6-5) ? Line flux of 12CO(6-5)
63- 65 F3.1 Jy.km/s e_F12CO(6-5) ? Line flux of 12CO(6-5) error
67 A1 --- l_F[CI] Upper limit flag on F[CI] (2)
68- 70 F3.1 Jy.km/s F[CI] ? Line flux of [CI](3P1-3P0)
72- 74 F3.1 Jy.km/s e_F[CI] ? Line flux of [CI](3P1-3P0) error
76 A1 --- l_FH2O Upper limit flag on FH2O (2)
77- 79 F3.1 Jy.km/s FH2O ? Line flux of H2O(211-202)
81- 83 F3.1 Jy.km/s e_FH2O ? Line flux of H2O(211-202) error
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Note (1): The linewidths of double-peaked profiles were estimated as
ΔV=Δw+Δs by fitting two Gaussians of identical
widths Δw and separation Δs. Linewidths and their uncertainties
are rounded to the closest multiples of 10km/s.
Note (2): For the sources that remain undetected in the [CI](3P1-3P0)
and H2O(211-202) transitions, we provide upper limits to the line
fluxes. The upper limits are based on 3σvsqrt(ΔVΔv),
where Δv and σv are the width in velocity and RMS noise of a
spectral channel, respectively. In the case of HerBS-70W and HerBS-95W,
the line fluxes and the upper limits were corrected for the primary beam
attenuation. See Sect. 3.1 for a discussion of the possible identification
of the emission line detected in HerBS-204.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Source HerBS name (HerBS-NNN or HerBS-NNNA) (1)
12- 15 F4.1 10+12Lsun muLMBB MBB infrared luminosity (50-1000um) (2)
17- 19 F3.1 10+12Lsun e_muLMBB MBB infrared luminosity (50-1000um)
error (3)
21- 25 F5.1 10+12Lsun muLDL07 DL07 infrared luminosity (8-1000um) (2)
27- 29 F3.1 10+12Lsun e_muLDL07 DL07 infrared luminosity (8-1000um)
error (3)
31- 34 F4.2 10+10Msun muMdustMBB MBB dust mass (2)
36- 39 F4.2 10+10Msun e_muMdustMBB MBB dust mass error (3)
41- 44 F4.1 K TdustMBB MBB dust temperature
46- 48 F3.1 K e_TdustMBB MBB dust temperature error (3)
50- 53 F4.2 10+10Msun muMdustDL07 DL07 dust mass (2)
55- 58 F4.2 10+10Msun e_muMdustDL07 DL07 dust mass error (3)
60- 63 F4.2 --- beta Spectral emissivity index
65- 68 F4.2 --- e_beta Spectral emissivity index error (3)
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Note (1): Regarding the sources that are double, appropriate corrections were
applied to estimate the flux densities of each source at 250, 350, and
500µm; see text for details.
For the sources HerBS-204 and HerBS-173, we used the stacked continuum data
(see Section 3.1). In the case of HerBS-204, we adopt a redshift zsp=2.37,
as the higher value (zsp=3.49) yields a dust temperature of 40K, which is
slightly higher than the values derived for the other sources in this sample
(see Sect. 3.1).
The MBB luminosities, dust masses, and temperatures include the effects of
the CMB; see section 4.2).
Note (2): not corrected for amplification (mu is the magnification factor).
Note (3): The quoted errors on the SED-fitting derived quantities are 1σ.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Source HerBS name (HerBS-NNN)
12- 15 F4.1 10+10K.km/s/pc2 muL'CO CO(1-0) luminosity (1)
17- 19 F3.1 10+10K.km/s/pc2 e_muL'CO CO(1-0) luminosity error
21- 24 F4.1 10+10Msun muMH2 H2 mass (1)
26- 28 F3.1 10+10Msun e_muMH2 H2 mass error
30- 33 F4.1 10+12Lsun muLFIR FIR luminosity (1)
35- 37 F3.1 10+12Lsun e_muLFIR FIR luminosity error
39- 42 F4.2 10+10Msun muMdust Dust mass (1)
44- 47 F4.2 10+10Msun e_muMdust Dust mass error
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Note (1): None of the properties in this table have been corrected for
gravitational magnification (mu is the magnification factor).
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Byte-by-byte Description of file: sp1/*
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Bytes Format Units Label Explanations
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3- 10 F8.4 GHz Freq Observing Frequency
14- 20 F7.3 mJy Flux ?=- Flux in line channel
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Byte-by-byte Description of file: sp2/*
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Bytes Format Units Label Explanations
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1- 10 F10.4 km/s VLSR LSR Velocity of line channel
14- 20 F7.3 mJy Flux Flux in line channel
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 39 E12.6 m/s VRAD ? Radial velocity
41- 44 I4 Kibyte size Size of FITS file
46- 64 A19 --- FileName Name of FITS file, in subdirectory fits
66-122 A57 --- Title Title of the FITS file
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Acknowledgements:
Roberto Neri, neri(at)iram.fr
(End) Roberto Neri [IRAM, France], Patricia Vannier [CDS] 03-Feb-2020