J/A+A/596/A60 NIBLES II. Arecibo follow-up observations (Butcher+, 2016)
NIBLES - an HI census of stellar mass selected SDSS galaxies.
II. Arecibo follow-up observations.
Butcher Z., Schneider S., van Driel W., Lehnert M., Minchin R.
<Astron. Astrophys. 596, A60 (2016)>
=2016A&A...596A..60B 2016A&A...596A..60B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Galaxies, spectra ; Radio lines ; H I data
Keywords: surveys - galaxies: general - galaxies: distances and redshifts -
radio lines: galaxies - galaxies: ISM
Abstract:
We obtained Arecibo HI line follow-up observations of 154 of the 2600
galaxies in the Nancay Interstellar Baryons Legacy Extragalactic
Survey (NIBLES) sample. These observations are on average four times
more sensitive than the original observations at the Nancay Radio
Telescope. The main goal of this survey is to characterize the
underlying HI properties of the NIBLES galaxies which were undetected
or marginally detected at Nancay. Of the Nancay non-detections, 85%
were either clearly or marginally detected at Arecibo, while 89% of
the Nancay marginal detections were clearly detected. Based on the
statistics of the detections relative to g-i color and r-band
luminosity (Lr) distribution among our Arecibo observations, we
anticipate ∼60% of our 867 Nancay non-detections and marginal
detections could be detected at the sensitivity of our Arecibo
observations. Follow-up observations of our low luminosity
(Lr<108.5L☉) blue sources indicate that they have, on average,
more concentrated stellar mass distributions than the Nancay
detections in the same luminosity range, suggesting we may be probing
galaxies with intrinsically different properties. These follow-up
observations enable us to probe HI mass fractions, log(MHI/M*) 0.5dex
and 1dex lower, on average, than the NIBLES and ALFALFA surveys
respectively.
Description:
HI line observations of the 139 clear or marginally detected sources
from the NIBLES Arecibo follow-up observations. Observations were
carried out with the Arecibo L-band wideband receiver (L-wide) with
the Wideband Arecibo Pulsar Processor (WAPP) correlator backend using
two polarizations with a bandpass of 50MHz across 4096 frequency
channels corresponding to a channel separation of approximately
2.6km/s. Spectrum files are the output files from Robert Minchin's
CORMEASURE routine from the Arecibo Observatory. Data have been
smoothed to approximately 18.7km/s. Velocities are heliocentric in
the optical convention in units of km/s and flux density is in
Janskys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 144 72 Basic optical and HI data - Arecibo detections
of Nancay non-detections and marginals
table2.dat 144 5 Basic optical and HI data - Arecibo marginal
detections of Nancay non-detections
table3.dat 144 15 Marginal and confused Nancay detections are
flagged with an M and K respectively
table4.dat 171 52 Basic optical and HI data - comparison of Arecibo
and Nancay detections
table5.dat 144 10 Basic optical and HI data - Arecibo detected
galaxies not included in the final Nancay sample
sp/* . 139 Individual spectra for galaxies in tables
1, 2, 4 and 5
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See also:
J/A+A/595/A118 : NIBLES. I. The Nancay HI survey (van Driel+, 2016)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat table5.dat
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Bytes Format Units Label Explanations
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1- 4 I04 --- Source Source number
5- 7 A3 --- n_Source [MDK ] Note (G1)
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 32 F5.2 arcsec DEs Declination (J2000)
34- 57 A24 --- Name Common name, other than SDSS
59- 62 I4 km/s Vopt Optical heliocentric radial velocity (cz)
64- 65 I2 km/s e_Vopt rms uncertainty on Vopt
67- 71 F5.2 mag g-z g-z integrated colour index of the galaxy
using SDSS model magnitudes, corrected for
Galactic extinction, following Schlegel et
al. (1998ApJ...500..525S 1998ApJ...500..525S)
73- 78 F6.2 mag gMAG Integrated absolute g magnitude, corrected
for Galactic extinction, following Schlegel
et al. (1998ApJ...500..525S 1998ApJ...500..525S)
80- 84 F5.2 [Msun] logM* ?=- Total median stellar mass estimate
86- 91 F6.2 [yr-1] logsSFR ? Specific star formation rate, or SFR/M*
93- 96 F4.2 mJy rms rms noise level value of HI spectra
98-101 I4 km/s VHI ? Heliocentric radial velocity (cz) of
the center of the HI line profile
103-104 I2 km/s e_VHI ? rms uncertainty on VHI
106-108 I3 km/s W50 ? Velocity width measured at 50% of the HI
profile peak level, uncorrected for galaxy
inclination
110-112 I3 km/s W20 ? Velocity width measured at 20% of the HI
profile peak level, uncorrected for galaxy
inclination
114-117 F4.2 Jy.km/s FHI ? Integrated HI line flu
119-122 F4.2 Jy.km/s e_FHI ? rms uncertainty on FHI
124-128 F5.2 --- SNR Peak signal-to-noise ratio (3)
129-132 F4.1 --- S/N ? Signal-to-noise ratio determined taking
into account the line width (G2)
133 A1 --- l_logMHI Limit flag on logMHI
134-138 F5.2 [Msun] logMHI HI mass
139 A1 --- l_logMHI/M* Limit flag on logMHI/M*
140-144 F5.2 [-] logMHI/M* ? HI to stellar mass ratio
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Note (3): Peak signal-to-noise ratio, which we define as the peak flux density
divided by the rms; For non-detections, the SNR listed is the maximum found
in the expected velocity range of the HI profile.
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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- 4 I04 --- Source Source number
5- 7 A3 --- n_Source [CDKR3 ] Note (G1)
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 32 F5.2 arcsec DEs Declination (J2000)
34- 57 A24 --- Name Common name, other than SDSS
59- 62 I4 km/s Vopt Optical heliocentric radial velocity (cz)
64- 65 I2 km/s e_Vopt rms uncertainty on Vopt
67- 71 F5.2 mag g-z g-z integrated colour index of the galaxy
using SDSS model magnitudes, corrected for
Galactic extinction, following Schlegel et
al. (1998ApJ...500..525S 1998ApJ...500..525S)
73- 78 F6.2 mag gMAG Integrated absolute g magnitude, corrected
for Galactic extinction, following Schlegel
et al. (1998ApJ...500..525S 1998ApJ...500..525S)
80- 84 F5.2 [Msun] logM* ?=- Total median stellar mass estimate
86- 91 F6.2 [yr-1] logsSFR ? Specific star formation rate, or SFR/M*
93- 96 F4.2 mJy rmsAO Arecibo rms noise level value of HI spectra
98-101 F4.2 mJy rmsNRT Nancay rms noise level value of HI spectra
103-106 I4 km/s VHIAO Arecibo heliocentric radial velocity (cz) of
the center of the HI line profile
108-109 I2 km/s e_VHIAO rms uncertainty on VHIAO
111-114 I4 km/s VHINRT Nancay heliocentric radial velocity (cz) of
the center of the HI line profile
116-117 I2 km/s e_VHINRT rms uncertainty on VHINRT
119-121 I3 km/s W50AO Arecibo velocity width measured at 50% of
the HI profile peak level, uncorrected for
galaxy inclination
123-125 I3 km/s W50NRT Nancay velocity width measured at 50% of the
HI profile peak level, uncorrected for
galaxy inclination
127-131 F5.2 Jy.km/s FHIAO Arecibo integrated HI line flux
133-136 F4.2 Jy.km/s e_FHIAO rms uncertainty on FHIAO
138-141 F4.1 Jy.km/s FHINRT Nancay integrated HI line flux
143-145 F3.1 Jy.km/s e_FHINRT rms uncertainty on FHINRT
147-152 F6.2 --- S/NAO Arecibo signal-to-noise ratio (G2)
154-159 F6.2 --- S/NNRT Nancay signal-to-noise ratio (G2)
161-165 F5.2 [Msun] logMHIAO Arecibo total HI mass
167-171 F5.2 [Msun] logMHINRT Nancay total HI mass
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Global notes:
Note (G1): Note as follows:
M = original Nancay detection classification changed to marginally detected
D = baseline ripple removed from HI spectrum
K = Nancay HI detection either clearly or possibly confused by another galaxy
within the NRT beam
C = HI detection of the target galaxy confused by another galaxy within the
Arecibo telescope beam
C3 = HI detection of the target galaxy confused by another galaxy in the
Arecibo telescope beam, but the secondary source likely contributes a
minor amount of flux to the total observed flux
R = sources possibly resolved by the Arecibo beam. These sources have an SDSS
optical image with a diameter about the same size as the Arecibo beam
which is expected to lead to an underestimate of their total HI flux.
Note (G2): Signal-to-noise ratio determined taking into account the line width,
following the ALFALFA HI survey formulation from
Saintonge (2007AJ....133.2087S 2007AJ....133.2087S):
S/N =1000(FHI/W50)*(W50/2*R)0.5/rms, where R is the velocity resolution,
18.7km/s on average.
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Byte-by-byte Description of file (#): sp/*
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Bytes Format Units Label Explanations
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3- 16 F14.8 km/s Vopt Optical heliocentric radial velocity
18- 31 E14.9 Jy SHI Flux density at 21-cm HI line
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Acknowledgements:
Zhon Butcher, zbutcher(at)astro.umass.edu
History:
* 30-Nov-2016: on-line version
* 12-Jan-2017: table4.dat corrected, velocities VHINRT initially in radio
convention rather than optical one (from author)
* 31-Aug-2018: In table2, for Source No 2162, Name 2MASX J23244466+0101490
corrected into SDSS J143152.98+032248.3
(End) Patricia Vannier [CDS] 29-Nov-2016