J/MNRAS/523/23 ALMA observations counterparts of SDSS dr14Q (Wong+, 2023)
ALMA High-Level Data Products: submillimetre counterparts of SDSS quasars
in the ALMA footprint.
Wong A., Hatziminaoglou E., Borkar A., Popping G., Perez-Fournon I.,
Poidevin F., Stoehr F., Messias H.
<Mon. Not. R. Astron. Soc. 523, 23-40 (2023)>
=2023MNRAS.523...23W 2023MNRAS.523...23W (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Millimetric/submm sources ; Optical ; Photometry ;
Spectroscopy ; Positional data ; Redshifts ; Cross identifications
Keywords: Astronomical data bases: catalogues - quasars: general -
submillimetre: galaxies
Abstract:
The Atacama Large Millimetre/submillimetre Array (ALMA) is the world's
most advanced radio interferometric facility, producing science data
with an average rate of about 1 TB per day. After a process of
calibration, imaging and quality assurance, the scientific data are
stored in the ALMA Science Archive (ASA), along with the corresponding
raw data, making the ASA an invaluable resource for original
astronomical research. Due to their complexity, each ALMA data set has
the potential for scientific results that go well beyond the ideas
behind the original proposal that led to each observation. For this
reason, the European ALMA Regional Centre initiated the High-Level
Data Products initiative to develop science-oriented data products
derived from data sets publicly available in the ASA, that go beyond
the formal ALMA deliverables. The first instance of this initiative is
the creation of a catalogue of submillimetre (submm) detections of
Sloan Digital Sky Survey (SDSS) quasars from the SDSS Data Release 14
that lie in the aggregate ALMA footprint observed since ALMA Cycle 0.
The ALMA fluxes are extracted in an automatic fashion, using the ALMA
Data Mining Toolkit. All extractions above a signal-to-noise cut of
3.5 are considered, they have been visually inspected and the reliable
detections are presented in a catalogue of 376 entries, corresponding
to 275 unique quasars. Interesting targets found in the process, i.e.
lensed or jetted quasars as well as quasars with nearby submm
counterparts are highlighted, to facilitate further studies or
potential follow up observations.
Description:
One of the key strategic goals of ALMA is to further increase the
scientific usage of the ASA and the development of science-oriented,
curated data products to further facilitate the scientific
exploitation of the ASA. In response to this, the European ARC network
launched the High-Level Data Products (HLDP) initiative. The goal of
the initiative is to develop such science-oriented data products of
interest to the community and to develop, internally, the knowledge to
support the community with a diverse range of archival science cases.
As a demonstration of the capabilities of HLDP-like initiatives, we
provide a catalogue of ALMA detections of Sloan Digital Sky Survey
quasars within the ALMA footprint (i.e. see section Introduction). The
parent sample for this study is the SDSS dr14Q of Paris et al.
(2018A&A...613A..51P 2018A&A...613A..51P, Cat. VII/286) of 526356 spectroscopically
confirmed quasars from all SDSS data releases up until DR14, which
have confirmed redshift, spectral properties, and black hole masses
detailed by Rakshit et al. (2020ApJS..249...17R 2020ApJS..249...17R, Cat. J/ApJS/249/17).
Setting aside sources with a declination above 40 deg, that are not
observable by ALMA, results in a list of 357392 objects to be
considered (i.e. see section 2). These sources were matched against
the metadata of the ASA to identify the objects within the ALMA
footprint. The SDSS quasars may have been the primary target of each
observation or they may be lying in a region observed by ALMA while
targeting different objects. The match resulted in a total of 1295
entries, i.e. 1295 instances of SDSS quasars falling within the ALMA
footprint. This corresponds to 732 unique sources within the regions
covered by 288 unique ALMA projects, with a total of 790 MOUSs. Then,
as detailed in section 3, to extract the submm continuum counterparts
of SDSS quasars in the ALMA footprint in an automated fashion, we made
use of the ALMA Data Mining Toolkit. Extractions was determined
through visual inspection. A total of 1707 ALMA extractions were
returned after the cross-matching between the ADMIT list and DR14Q
catalogue, applying a 5 arcsec search radius around the SDSS
coordinates.
Finally as explicited in section 4, following the visual inspection,
the submm counterparts of SDSS quasars in the DR14Q catalogue were
identified. A total of 376 reliable detections of 275 unique objects
from 84 unique projects were found. The tableb1.dat contains the first
20 entries of the full catalogue of submm detections of DR14Q quasars
in the ALMA footprint. The tableb2.dat shows the list of DR14Q quasars
in the ALMA footprint with more than one submm counterparts extracted
within 5 arcsec from the optical coordinates of the quasar. There are
cases for which more counterparts are visible on the images than the
ones identified by the automated extraction method. The tableb3.dat
lists the flux of the various visually confirmed substructures
identified on the images of and around the lensed quasars discussed in
Section 5.2. The tableb4.dat lists the DR14Q quasars in the ALMA
footprint for which no submm counterpart was extracted. Finally, the
tableb5.dat contains the four quasars with visible submm counterparts
for which no primary-beam correction curve was available and for which
the automated extraction did not return any information.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tableb1.dat 322 376 Astrometric and observation quantities of main
catalogue of DR14Q quasars with ALMA detections
tableb3.dat 322 44 Astrometric and observation quantities from
extractions of multiple images of six lensed
quasars main
tableb2.dat 321 48 Astrometric and observation quantities of SDSS
quasars with confirmed ALMA counterparts that
have possible close companions within 5 arcsec
tableb4.dat 156 670 Astrometric and observation quantities of
SDSSdr14 quasars not detected by ALMA
tableb5.dat 156 4 Astrometric and observation quantities of the
four objects whose images did not have a primary
beam response curve and for which the automatic
flux extraction did not return flux measurement
--------------------------------------------------------------------------------
See also:
J/MNRAS/505/4726 : Study of relativistic jets in blazar objects (Keenan+, 2021)
J/MNRAS/478/1512 : ALMA calibrator continuum observations catalog
(Bonato+, 2018)
J/ApJ/806/258 : Optical LCs of QSO J0924+0219 lensed quasar (MacLeod+, 2015)
J/ApJS/249/17 : SDSS QSO DR14 spectral properties (Rakshit+, 2020)
VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)
Byte-by-byte Description of file: tableb1.dat tableb3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS Designation HHMMSS.ss+DDMMSS.s as in SDSS
DR14Q of Paris et al. 2018A&A...613A..51P 2018A&A...613A..51P,
Cat. VII/286 (SDSS_Name)
20- 21 I2 h RAh Right Ascension from SDSS (J2000) (SDSS_Ra)
23- 24 I2 min RAm Right Ascension from SDSS (J2000) (SDSS_Ra)
26- 30 F5.2 s RAs Right Ascension from SDSS (J2000) (SDSS_Ra)
32 A1 --- DE- Declination sign (J2000) (SDSS_Dec)
33- 34 I2 deg DEd Declination from SDSS (J2000) (SDSS_Dec)
36- 37 I2 arcmin DEm Declination from SDSS (J2000) (SDSS_Dec)
39- 42 F4.1 arcsec DEs Declination from SDSS (J2000) (SDSS_Dec)
44- 51 F8.6 --- z Spectroscopic redshift (z)
53- 54 I2 h RAah Right Ascension from ALMA (J2000) (ALMA_Ra)
56- 57 I2 min RAam Right Ascension from ALMA (J2000) (ALMA_Ra)
59- 63 F5.2 s RAas Right Ascension from ALMA (J2000) (ALMA_Ra)
65 A1 --- DEa- Declination sign (J2000) (ALMA_Dec)
66- 67 I2 deg DEad Declination from ALMA (J2000) (ALMA_Dec)
69- 70 I2 arcmin DEam Declination from ALMA (J2000) (ALMA_Dec)
72- 75 F4.1 arcsec DEas Declination from ALMA (J2000) (ALMA_Dec)
77- 96 F20.18 arcsec Sep Angular separation between ALMA and SDSS
(Sep._arcsec)
98 I1 --- Band ALMA observational receiver band number as
described in (https://www.eso.org/public/
teles-instr/alma/receiver-bands/) (Band)
100-102 A3 --- Array ALMA array used for the observations (Array)
104-122 F19.17 arcsec Res Angular resolution of ALMA observations
(Ang._res.)
124-143 F20.18 mJy Cont The continuum sensitivity of the ALMA image
(Cont._sens.)
145-166 F22.17 mJy Fpeak The ALMA peak flux (PeakfluxmJy)
168-174 F7.2 --- SNRp The signal to noise ratio of the peak flux
(PeakfluxSNR)
176-197 F22.17 mJy Fint The integrated ALMA flux (Int.fluxmJy)
199-205 F7.2 --- SNRi The signal to noise ratio of the integrated
flux (Int.fluxSNR)
207-211 F5.3 arcsec MajAxis The major axis αmax of the
extracted 2D Gaussian (Majoraxisarcsec)
213-218 F6.4 arcsec MinAxis The minor axis αmin of the
extracted 2D Gaussian (Minoraxisarcsec)
220-226 F7.3 deg PA The position angle of the ellipse (PA)
228-231 F4.2 arcsec MajbAxis The major axis of the ALMA beam
(Beammajorarcsec)
233-236 F4.2 arcsec MinbAxis The minor axis of the ALMA beam
(Beamminorarcsec)
238-243 F6.2 deg PAb The position angle associated to the ALMA
beam (Beam_PA)
245-266 F22.19 mJy RMS The RMS of the image (RMS_mJy)
268-277 A10 "Y:M:D" Obs Observation date as the first execution in
case of multiple executions (Obs._date)
279-292 A14 --- Proj The ALMA project code ID (Project_code)
294-316 A23 --- MOUS The MOUS Member Observation Unit Set
identifier (MOUS_id)
318-322 A5 --- ALMACAL Flag to indicate if the object is part of
ALMACAL projet (ALMACAL)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS Designation HHMMSS.ss+DDMMSS.s as in SDSS
DR14Q of Paris et al. 2018A&A...613A..51P 2018A&A...613A..51P,
Cat. VII/286 (SDSS_Name)
20 I1 --- f_SDSS ? Indicates the number of secondary
counterparts visible on the images but with
no flux extraction from the automated
process
22- 23 I2 h RAh Right Ascension from SDSS (J2000) (SDSS_Ra)
25- 26 I2 min RAm Right Ascension from SDSS (J2000) (SDSS_Ra)
28- 32 F5.2 s RAs Right Ascension from SDSS (J2000) (SDSS_Ra)
34 A1 --- DE- Declination sign (J2000) (SDSS_Dec)
35- 36 I2 deg DEd Declination from SDSS (J2000) (SDSS_Dec)
38- 39 I2 arcmin DEm Declination from SDSS (J2000) (SDSS_Dec)
41- 44 F4.1 arcsec DEs Declination from SDSS (J2000) (SDSS_Dec)
46- 53 F8.6 --- z Spectroscopic redshift (z)
55- 56 I2 h RAah Right Ascension from ALMA (J2000) (ALMA_Ra)
58- 59 I2 min RAam Right Ascension from ALMA (J2000) (ALMA_Ra)
61- 65 F5.2 s RAas Right Ascension from ALMA (J2000) (ALMA_Ra)
67 A1 --- DEa- Declination sign (J2000) (ALMA_Dec)
68- 69 I2 deg DEad Declination from ALMA (J2000) (ALMA_Dec)
71- 72 I2 arcmin DEam Declination from ALMA (J2000) (ALMA_Dec)
74- 77 F4.1 arcsec DEas Declination from ALMA (J2000) (ALMA_Dec)
79 A1 --- n_SDSS Indicates the multiplicity of the SDSS
source with counterparts having extracted
fluxes
81-100 F20.18 arcsec Sep Angular separation between ALMA and SDSS
(Sep._arcsec)
102 I1 --- Band ALMA observational receiver band number as
described in (https://www.eso.org/public/
teles-instr/alma/receiver-bands/) (Band)
104-106 A3 --- Array ALMA array used for the observations (Array)
108-126 F19.17 arcsec Res Angular resolution of ALMA observations
(Ang._res.)
128-147 F20.18 mJy Cont The continuum sensitivity of the ALMA image
(Cont._sens.)
149-169 F21.17 mJy Fpeak The ALMA peak flux (PeakfluxmJy)
171-176 F6.2 --- SNRp The signal to noise ratio of the peak flux
(PeakfluxSNR)
178-199 F22.18 mJy Fint The integrated ALMA flux (Int.fluxmJy)
201-206 F6.2 --- SNRi The signal to noise ratio of the integrated
flux (Int.fluxSNR)
208-212 F5.3 arcsec MajAxis The major axis αmax of the
extracted 2D Gaussian (Majoraxisarcsec)
214-218 F5.3 arcsec MinAxis The minor axis αmin of the
extracted 2D Gaussian (Minoraxisarcsec)
220-225 F6.2 deg PA The position angle of the ellipse (PA)
227-230 F4.2 arcsec MajbAxis The major axis of the ALMA beam
(Beammajorarcsec)
232-235 F4.2 arcsec MinbAxis The minor axis of the ALMA beam
(Beamminorarcsec)
237-242 F6.2 deg PAb The position angle associated to the ALMA
beam (Beam_PA)
244-264 F21.19 mJy RMS The RMS of the image (RMS_mJy)
266-277 A12 "Y:M:D" Obs Observation date as the first execution in
case of multiple executions (Obs._date)
279-292 A14 --- Proj The ALMA project code ID (Project_code)
294-315 A22 --- MOUS The MOUS Member Observation Unit Set
identifier (MOUS_id)
317-321 A5 --- ALMACAL Flag to indicate if the object is part of
ALMACAL projet (ALMACAL)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb4.dat tableb5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS Designation HHMMSS.ss+DDMMSS.s as in SDSS DR14Q
of Paris et al. 2018A&A...613A..51P 2018A&A...613A..51P, Cat.
VII/286 (SDSS_Name)
20- 21 I2 h RAh Right Ascension from SDSS (J2000) (SDSS_Ra)
23- 24 I2 min RAm Right Ascension from SDSS (J2000) (SDSS_Ra)
26- 30 F5.2 s RAs Right Ascension from SDSS (J2000) (SDSS_Ra)
32 A1 --- DE- Declination sign (J2000) (SDSS_Dec)
33- 34 I2 deg DEd Declination from SDSS (J2000) (SDSS_Dec)
36- 37 I2 arcmin DEm Declination from SDSS (J2000) (SDSS_Dec)
39- 42 F4.1 arcsec DEs Declination from SDSS (J2000) (SDSS_Dec)
44- 62 F19.17 --- z Spectroscopic redshift (z)
64 I1 --- Band1 ? ALMA observational receiver band number
(Band) (1)
66 I1 --- Band2 ? ALMA observational receiver band number
(Band) (1)
68 I1 --- Band3 ? ALMA observational receiver band number
(Band) (1)
70- 72 A3 --- Array ALMA array used for the observations (Array)
74- 94 F21.18 arcsec Res Angular resolution of ALMA observations
(Ang._res.)
96-116 F21.18 mJy Cont The continuum sensitivity of the ALMA image
(Cont._sens.)
118-132 A15 --- Proj The ALMA project code ID (Project_code)
134-156 A23 --- MOUS The MOUS Member Observation Unit Set identifier
(MOUS_id)
--------------------------------------------------------------------------------
Note (1): ALMA bands described in
(https://www.eso.org/public/teles-instr/alma/receiver-bands/).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
License: CC-BY-4.0
(End) Luc Trabelsi [CDS] 18-May-2026