J/MNRAS/522/5308 MIGHTEE-HI fluxes of COSMOS/XMM-LSS sources (Ponomareva+, 2023)
MIGHTEE-H I the first MeerKAT H I mass function from an untargeted
interferometric survey.
Ponomareva A.A., Jarvis M.J., Pan H., Maddox N., Jones M.G., Frank B.S.,
Rajohnson S.H.A., Mulaudzi W., Meyer M., Adams E.A.K., Baes M., Hess K.M.,
Kurapati S., Prandoni I., Sinigaglia F., Spekkens K., Tudorache M.,
Heywood I., Collier J.D., Sekhar S.
<Mon. Not. R. Astron. Soc. 522, 5308-5319 (2023)>
=2023MNRAS.522.5308P 2023MNRAS.522.5308P (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Radio sources ; H I data ; Positional data ;
Photometry ; Spectroscopy
Keywords: surveys - galaxies: evolution - galaxies: ISM -
galaxies: luminosity function, mass function - radio lines: galaxies
Abstract:
We present the first measurement of the H I mass function (HIMF) using
data from MeerKAT, based on 276 direct detections from the MeerKAT
International GigaHertz Tiered Extragalactic Exploration (MIGHTEE)
Survey Early Science data covering a period of approximately a billion
years (0 ≤ z ≤ 0.084). This is the first HIMF measured using
interferometric data over non-group or cluster field, i.e. a deep
blank field. We constrain the parameters of the Schechter function
that describes the HIMF with two different methods: 1/Vmax and
modified maximum likelihood (MML). We find a low-mass slope
α=-1.29+0.37-0.26 , 'knee' mass
log10 (M* / M☉) = 10.07+0.24-0.24 and normalization
log10 (φ* / Mpc-3) = -2.34+0.32-0.36 (H0 = 67.4 km/s/Mpc)
for 1/Vmax , and α = -1.44+0.13-0.10 , 'knee' mass
log10 (M* / M☉) = 10.22+0.10-0.13 and normalization
log10 (φ* / Mpc-3) = -2.52+0.19-0.14 for MML. When using
1/Vmax we find both the low-mass slope and 'knee' mass to be
consistent within 1σ with previous studies based on single-dish
surveys. The cosmological mass density of H I is found to be slightly
larger than previously reported:
ΩHI = 5.46+0.94-0.99 * 10-4 h-167.4 from 1/Vmax and
ΩHI = 6.31+0.31-0.31 * 10-4 h-167.4 from MML but
consistent within the uncertainties. We find no evidence for evolution
of the HIMF over the last billion years.
Description:
We present the first measurement of the HIMF using data from the
MeerKAT telescope. We use the MIGHTEE Early Science data in order to
construct the HIMF over the last billion years (0 ≤ z ≤ 0.084) and
calculate the cosmic H I mass density over this redshift range. This
is also the first HIMF measured using interferometric data over
non-group or cluster field, i.e. a deep blank field. Our work
demonstrates the capabilities of MeerKAT and provides a benchmark for
the future H I evolutionary studies with the SKA pathfinders. MIGHTEE
is a MeerKAT survey of four deep, extragalactic fields COSMOS,
XMM-LSS, ECDFS, ELAIS-S1. MeerKAT is a radio interferometer that
consists of 64 offset Gregorian dishes and equipped with three
receivers covering the frequency range from 580 to 3500 MHz. MIGHTEE
is simultaneously a spectral line, continuum, and polarization survey.
For this study we use the Early Science data, which were collected as
part of the H I emission project within the MIGHTEE survey. A
detailed description of MIGHTEE-H I is presented in Maddox et al.
(2021A&A...646A..35M 2021A&A...646A..35M). The Early Science MIGHTEE observations were
conducted between mid-2018 and mid-2019 in L band
(900 < ν < 1670 MHz) with a limited spectral resolution.
As explicited in section 2, the source finding was performed visually
by inspecting the H I data cubes with CARTA tool. The total Early
Science sample consists of 276 objects, each of which has an
identified optical counterpart in the very deep multiwavelength data
over these fields. However, we note that a counterpart was not
required for a source to be considered genuine. Although even the full
MIGHTEE survey will not be able to compete with the sky coverage of
the ALFALFA survey (∼6900 deg2 vs ∼32 deg2), the MIGHTEE Early
Science flux limit is a factor of 10 deeper than the approximate flux
limit of the large-area ALFALFA survey, and extends further in
redshift (e.g. a galaxy with an H I mass equal to 109 M☉ and
H I line width equal to 100 km/s would be detectable by ALFALFA out
to a distance of ∼80 Mpc while a galaxy with the same parameters will
be detectable by MIGHTEE to ∼428 Mpc). It allows us to study both the
low-mass slope and the 'knee' of the HIMF out to larger redshifts.
Next in our study section 3, the integrated H I flux density has
been calculated using the moment-0 maps constructed individually for
each source, taking diffuse low column density emission into account.
Extracted results for finding sources are presented in mightee.dat.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
mightee.dat 70 276 MIGHTEE Early science data from COSMOS and
XMMLSS in 1310-1420 MHz and spectral resolution
of 208985.824635 Hz
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See also:
J/MNRAS/508/1195 : The bTFr of MIGHTEE-H I spiral galaxies (Ponomareva+, 2021)
J/MNRAS/501/4550 : The complete Arecibo Ultra-Deep Survey (Xi+, 2021)
J/MNRAS/498/883 : Neutral hydrogen evolution over the past 11Gyr
(Grasha+, 2020)
J/MNRAS/494/2090 : Group galaxies in ALFALFA survey (Jones+, 2020)
J/MNRAS/473/1879 : VVDS14h redshift catalog (Rhee+, 2018)
J/MNRAS/460/923 : WSRT ZoA Perseus-Pisces. HI catalogue (Ramatsoku+, 2016)
J/MNRAS/346/1103 : Redshifts of damped Lymanα absorbers (Peroux+, 2003)
J/A+A/654/A173 : MeerKAT 21-cm HI imaging of Abell 2626 (Healy+, 2021)
J/A+A/604/A43 : HI in nearby radio sources (Maccagni+, 2017)
J/A+A/564/A125 : AGN Torus model comparison of AGN in the CDFS
(Buchner+, 2014)
J/A+A/547/L1 : SDSS-III DR9 DLA catalogue (Noterdaeme+, 2012)
J/ApJ/818/113 : HST observations of QSOs with medium spectra
(Neeleman+, 2016)
J/AJ/142/170 : ALFALFA survey: the α.40 HI source catalog
(Haynes+, 2011)
III/334 : VISTA Deep Extragalactic Observations (VIDEO) (Jarvis+,2013)
II/373 : The fourth UltraVISTA data release (DR4) (Moneti+, 2019)
Byte-by-byte Description of file: mightee.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Name Source name designation as
MGTH_JHHMMSS.s+DDMMSS (name)
23- 32 F10.6 deg RAdeg Right ascension (J2000) (ra)
34- 42 F9.6 deg DEdeg Declination (J2000) (dec)
44- 51 F8.6 GHz Freq Observed frequency HI rest frequency is
1.420405 GHz (freq)
53- 61 F9.6 Jy.km/s FHI Integrated total HI flux density (Sdv)
63- 70 F8.6 Jy.km/s e_FHI Error on the integrated total HI flux density
(err_Sdv)
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History:
From electronic version of the journal
License: CC-BY-4.0
(End) Luc Trabelsi [CDS] 16-Jul-2026