J/A+A/595/A118 NIBLES. I. The Nancay HI survey (van Driel+, 2016)
NIBLES - an HI census of stellar mass selected SDSS galaxies:
I. The Nancay HI survey.
van Driel M., Butcher Z., Schneider S., Lehnert M., Minchin R., Blyth S-L.,
Chemin L., Hallet N., Joseph T., Kotze P., Kraan-Korteweg R.C., Olofsson H.,
Ramatsoku M.
<Astron. Astrophys. 595, A118 (2016)>
=2016A&A...595A.118V 2016A&A...595A.118V (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; H I data ; Photometry, SDSS ; Radial velocities
Keywords: galaxies: general - galaxies: distances and redshifts -
galaxies: ISM - galaxies: photometry - radio lines: galaxies
Abstract:
To investigate galaxy properties as a function of their total stellar
mass, we obtained 21cm HI line observations at the 100-m class Nancay
Radio Telescope of 2839 galaxies from the Sloan Digital Sky Survey
(SDSS) in the Local Volume (900<cz<12000km/s), dubbed the
Nancay Interstellar Baryons Legacy Extragalactic Survey (NIBLES)
sample. They were selected evenly over their entire range of absolute
SDSS z-band magnitudes (Mz~-13.5 to -24mag), which were used as a
proxy for their stellar masses. In this paper, a first, global
presentation of the observations and basic results is given; their
further analysis will be presented in other papers in this series. The
galaxies were originally selected based on their properties, as listed
in SDSS DR5. Comparing this photometry to their total HI masses, we
noted that, for a few percent, the SDSS magnitudes appeared severely
misunderestimated, as confirmed by our re-measurements for selected
objects. Although using the later DR9 results eliminated this problem
in most cases, 384 still required manual photometric source selection.
Usable HI spectra were obtained for 2600 of the galaxies, of which
1733 (67%) were clearly detected and 174 (7%) marginally. The spectra
for 241 other observed galaxies could not be used for further analysis
owing to problems with either the HI or the SDSS data. We reached the
target number of about 150 sources per half-magnitude bin over the Mz
range -16.5 to -23mag. Down to -21mag the overall detection
rate is rather constant at the ∼75% level but it starts to decline
steadily towards the 30% level at -23mag. Making regression fits
by comparing total HI and stellar masses for our sample, including our
conservatively estimated HI upper limits for non-detections, we find
the relationship log(MHI/M*)=-0.59log(M*)+5.05, which lies
significantly below the relationship found in the MHI/M*-M* plane
when only using HI detections.
Description:
HI 21cm line spectra of the 1870 clearly or marginally detected SDSS
sources obtained for NIBLES at the Nancay Radio Telescope. Please note
that these include the six detections with velocities below the 900
km/s lower limit for the NIBLES statistical sample, which are listed
in Table A.5 (NIBLES sources 0347, 1572, 1734, 1897, 2259, and 2326).
See Sect. 3 of the paper for further details on data acquisition and
reduction. Data have been smoothed in velocity to 18 km/s resolution
(see exact number in the spectrum headers). A fitted polynomial
baseline was substracted from the observed spectra. Velocities (first
column) are heliocentric in the optical convention in units of km/s
and flux densities (second column) are in Janskys.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea12.dat 161 1864 Basic optical and HI data - clearly and marginally
detected galaxies (tables A1 and A2 of the paper)
tablea5.dat 127 6 Basic optical and HI data - galaxies with V<850km/s
not used for further analysis
tablea3.dat 119 730 Basic optical and HI data - non-detected galaxies
sp/* . 1870 Individual HI 21cm spectra
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Byte-by-byte Description of file: tablea12.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Note [cm] clearly (c) or marginally (m)
detected galaxy
3- 6 I04 --- Source Internal source number
8- 15 A8 --- Flag Flags regarding the SDSS and NRT data
16- 17 I2 h RAh Right ascension (J2000.0)
19- 20 I2 min RAm Right ascension (J2000.0)
22- 26 F5.2 s RAs Right ascension (J2000.0)
28 A1 --- DE- Declination sign (J2000.0)
29- 30 I2 deg DEd Declination (J2000.0)
32- 33 I2 arcmin DEm Declination (J2000.0)
35- 39 F5.2 arcsec DEs Declination (J2000.0)
41- 64 A24 -- Name common catalog name, other than the SDSS
66- 70 I5 km/s Vopt Optical heliocentric radial velocity, cz
72- 74 I3 km/s e_Vopt Uncertainty in Vopt
76- 80 F5.2 mag g-z ?=- SDSS g-z band color, based on model
magnitudes
82- 87 F6.2 mag gMAG SDSS absolute g-band model magnitude
89- 93 F5.2 [Msun] log(M*) ?=- Logarithm of the MEDIAN total stellar
mass estimate
95-100 F6.2 [1/yr] log(sSFR) ?=- Logarithm of the specific Star
Formation Rate, or SFR/M*
102-106 F5.2 mJy rms rms noise level values of the HI spectra
108-112 I5 km/s VHI Heliocentric HI radial velocity
114-116 I3 km/s e_VHI Uncertainty in VHI
118-120 I3 km/s W50 HI profile velocity width measured at 50%
of the peak level
122-125 I4 km/s W20 HI profile velocity width measured at 20%
of the peak level
127-131 F5.2 Jy.km/s FHI Integrated measured HI line flux
133-136 F4.2 Jy.km/s e_FHI Uncertainty in FHI
139-142 F4.1 --- SNR Peak signal-to-noise ratio
145-149 F5.1 --- S/N Signal-to-noise ratio determined taking
into account the HI line width
151-155 F5.2 [Msun] log(MHI) Logarithm of the total HI mass
157-161 F5.2 --- log(MHI/M*) ?=- Logarithm of the ratio of the total HI
and stellar masses
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Byte-by-byte Description of file: tablea5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I04 --- Source Internal source number
5- 6 A2 --- Flag Flags regarding the SDSS and NRT data
8- 9 I2 h RAh Right ascension (J2000.0)
11- 12 I2 min RAm Right ascension (J2000.0)
14- 18 F5.2 s RAs Right ascension (J2000.0)
20 A1 --- DE- Declination sign (J2000.0)
21- 22 I2 deg DEd Declination (J2000.0)
24- 25 I2 arcmin DEm Declination (J2000.0)
27- 31 F5.2 arcsec DEs Declination (J2000.0)
33- 43 A11 -- Name common catalog name, other than the SDSS
46- 48 I3 km/s Vopt Optical heliocentric radial velocity, cz
50- 51 I2 km/s e_Vopt Uncertainty in Vopt
53- 56 F4.2 mag g-r ?=- SDSS g-r band color, based on model
magnitudes
58- 63 F6.2 mag gMAG SDSS absolute g-band model magnitude
65- 68 F4.2 [Msun] log(M*) ?=- Logarithm of the MEDIAN total stellar
mass estimate
70- 75 F6.2 [1/yr] log(sSFR) ?=- Logarithm of the specific Star
Formation Rate, or SFR/M*
77- 80 F4.2 mJy rms rms noise level values of the HI spectra
82- 84 I3 km/s VHI Heliocentric HI radial velocity
86- 87 I2 km/s e_VHI Uncertainty in VHI
89- 91 I3 km/s W50 HI profile velocity width measured at 50%
of the peak level
93- 95 I3 km/s W20 HI profile velocity width measured at 20%
of the peak level
97-101 F5.2 Jy.km/s FHI Integrated measured HI line flux
103-106 F4.2 Jy.km/s e_FHI Uncertainty in FHI
108-111 F4.1 --- SNR Peak signal-to-noise ratio
113-117 F5.1 --- S/N Signal-to-noise ratio determined taking
into account the HI line width
119-122 F4.2 [Msun] log(MHI) Logarithm of the total HI mass
124-127 F4.2 --- log(MHI/M*) ?=- Logarithm of the ratio of the total HI
and stellar masses
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Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I04 --- Source Source number
6- 11 A6 --- Flag Flags regarding the SDSS and NRT data
13- 14 I2 h RAh Right ascension (J2000.0)
16- 17 I2 min RAm Right ascension (J2000.0)
19- 23 F5.2 s RAs Right ascension (J2000.0)
25 A1 --- DE- Declination sign (J2000.0)
26- 27 I2 deg DEd Declination (J2000.0)
29- 30 I2 arcmin DEm Declination (J2000.0)
32- 36 F5.2 arcsec DEs Declination (J2000.0)
38- 61 A24 --- Name Common catalog name, other than the SDSS
62- 66 I5 km/s Vopt Optical heliocentric radial velocity, cz
68- 69 I2 km/s e_Vopt rms uncertainty on Vopt
71- 75 F5.2 mag g-z SDSS g-z colour index, based on model
magnitudes
77- 82 F6.2 mag gMAG SDSS absolute g-band model magnitude
84- 88 F5.2 [Msun] log(M*) ?=- Logarithm of the MEDIAN total stellar
mass estimate
90- 95 F6.2 [1/yr] log(sSFR) ?=- Logarithm of the specific Star
Formation Rate, or SFR/M*
97-100 F4.2 mJy rms rms noise level values of the HI spectra
102-105 F4.1 --- SNR Peak signal-to-noise ratio
107 A1 --- l_log(MHI) Limit flag on logMHI
108-112 F5.2 [Msun] log(MHI) HI mass
114 A1 --- l_log(MHI/M*) limit flag on logMHI/M*
115-119 F5.2 --- log(MHI/M*) Logarithm of the ratio of the total HI
and stellar masses
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Byte-by-byte Description of file (#): sp/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 16 F13.7 km/s Vopt Heliocentric optical velocity
19- 32 F14.11 Jy SHI Flux density at 21cm
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Acknowledgements:
Wim van Driel, wim.vandriel(at)obspm.fr
History:
* 11-Nov-2016: tables A1-A3
* 05-Dec-2016: spectra added
(End) Patricia Vannier [CDS] 07-Nov-2016