J/A+A/642/A175 NIBLES bivariate luminosity function (Butcher+, 2020)
The NIBLES bivariate luminosity-HI mass distribution function revised using
Arecibo follow-up observations.
Butcher Z., van Driel W., Schneider S.
<Astron. Astrophys. 642, A175 (2020)>
=2020A&A...642A.175B 2020A&A...642A.175B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Spectra, radio
Keywords: galaxies: statistics - galaxies: general - galaxies: formation -
galaxies: dwarf - radio lines: galaxies
Abstract:
We present a modified optical luminosity-HI mass bivariate luminosity
function (BLF) based on HI line observations from the Nancay
Interstellar Baryons Legacy Extragalactic Survey (NIBLES), including
data from our new, four times more sensitive follow-up HI line
observations obtained with the Arecibo radio telescope. The follow-up
observations were designed to probe the underlying HI mass
distribution of the NIBLES galaxies that were undetected or marginally
detected in HI at the Radio Telescope. Our total follow-up sample
consists of 234 galaxies, and it spans the entire luminosity and color
range of the parent NIBLES sample of 2600 nearby (900<cz<12000km/s)
SDSS galaxies. We incorporated the follow-up data into the bivariate
analysis by scaling the NIBLES undetected fraction by an Arecibo-only
distribution. We find the resulting increase in low HI mass-to-light
ratio densities to be about 10% for the bins -1.0≤log(M/L)≤-0.5,
which produces an increased HI mass function (HIMF) low mass slope of
α=-1.14±0.07, being slightly shallower than the values of
-1.35±0.05 obtained by recent blind HI surveys. Applying the same
correction to the optically corrected bivariate luminosity function
from our previous paper produces a larger density increase of about
0.5 to 1dex in the lowest HI mass-to-light ratio bins for a given
luminosity while having a minimal effect on the resulting HIMF low
mass slope, which still agrees with blind survey HIMFs. This indicates
that while low HI-mass-to-light ratio galaxies do not contribute much
to the one-dimensional HIMF, their inclusion has a significant impact
on the densities in the two-dimensional distribution.
Description:
Arecibo observations were taken with the L-band wideband receiver and
the Wideband Arecibo Pulsar Processor (WAPP) autocorrelator backend
with two polarizations, a bandpass of 50MHz (10600km/s) and 4096
frequency channels separated by 2.6km/s. The receiver half-power beam
width is 3.5' and the system temperature ranges from 28 to 32K. Data
were taken in standard 5/5 minute integration ON/OFF position
switching mode. All galaxies were first observed for one 5/5 minute
cycle, and the weak and nondetections were then repeated depending on
available telescope time.
Included data consists of Arecibo clear detections and marginal
detections.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 162 79 Arecibo detections
tablea2.dat 162 17 Arecibo marginal detections
fits/* . 17 Individual fits spectra
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Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 4 I04 --- Source NIBLES source number
6- 7 A2 --- n_Source [MUC ] Note on Source
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- 56 A23 --- Name Common catalog name
58- 62 I5 km/s Vopt SDSS determined recession velocity
64- 65 I2 km/s e_Vopt rms uncertainty on Vopt
67- 71 F5.2 mag g-z g-z extinction corrected galaxy color
73- 78 F6.2 mag gMAG Absolute g-band magnitude
80- 84 F5.2 [Msun] log(M*) ? Median stellar mass estimates
86- 90 F5.2 [Lsun] log(Lr) SDSS r-band luminosity in solar units
92- 97 F6.2 1/yr log(sSFR) ? Specific star formation rate
99-102 F4.2 mJy rms rms noise values of the HI spectra
104-108 I5 km/s VHI HI line profile center velocity
110-111 I2 km/s e_VHI rms uncertainty on VHI
113-115 I3 km/s W50 velocity width at 50% the profile peak
117-119 I3 km/s W20 velocity width at 20% the profile peak
121-125 F5.2 Jy.km/s FHI Integrated flux density of HI profile
127-130 F4.2 Jy.km/s e_FHI rms uncertainty on FHI
132-135 F4.1 --- SNR Peak signal-to-noise ratio
137-141 F5.1 --- S/N Signal-to-noise from Saintonge (2007)
143-146 F4.2 [Msun] log(MHI) Total HI mass
148-152 F5.2 --- log(MHI/M*) ? HI mass to stellar mass ratio
154-162 A9 --- FileName Name of the fits spectrum in
subdirectory fits
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Acknowledgements:
Zhon Butcher, zbutcher(at)astro.umass.edu
(End) Patricia Vannier [CDS] 08-Jun-2020