J/ApJS/263/27 CLAMATO DR2 redshift catalog (Horowitz+, 2022)
Second Data Release of the COSMOS Lyα Mapping and Tomography Observations:
the first 3D maps of the detailed cosmic web at 2.05<z<2.55.
Horowitz B., Lee K.-G., Ata M., Muller T., Krolewski A., Prochaska J.X.,
Hennawi J.F., White M., Schlegel D., Rich R.M., Nugent P.E., Suzuki N.,
Kashino D., Koekemoer A.M., Lemaux B.C.
<Astrophys. J. Suppl. Ser., 263, 27 (2022)>
=2022ApJS..263...27H 2022ApJS..263...27H
ADC_Keywords: Intergalactic medium; Galaxies, spectra; QSOs; Redshifts; Optical;
Surveys
Keywords: Intergalactic medium ; Extragalactic astronomy ;
Intergalactic filaments ; Intergalactic gas ; Voids ;
High-redshift galaxy clusters ; Galaxy clusters ; Lyman alpha forest ;
Spectroscopy ; Redshift surveys ; Surveys ; Hubble Space Telescope
Abstract:
We present the second data release of the COSMOS Lyα Mapping And
Tomography Observations Survey conducted with the Low Resolution
Imaging Spectrometer on the Keck I telescope. This project used
Lyα forest absorption in the spectra of faint star-forming
galaxies and quasars at z∼2-3 to trace neutral hydrogen in the
intergalactic medium. In particular, we use 320 objects over a
footprint of ∼0.2deg2 to reconstruct the absorption field at
2.05<z<2.55 at ∼2h-1Mpc resolution. We apply a Wiener filtering
technique to the observed data to reconstruct three-dimensional (3D)
maps of the field over a volume of 4.1x105h-3Mpc3. In addition
to the filtered flux maps, for the first time we infer the underlying
dark matter field through a forward-modeling framework from a joint
likelihood of galaxy and Lyα forest data, finding clear examples
of the detailed cosmic web consisting of cosmic voids, sheets,
filaments, and nodes. In addition to traditional figures, we present a
number of interactive 3D models to allow exploration of the data and
qualitative comparisons to known galaxy surveys. We find that our
inferred overdensities are consistent with those found from galaxy
fields. We will make all our reduced spectra, extracted Lyα
forest pixel data, and reconstructed tomographic maps publicly
available upon publication.
Description:
The COSMOS Lyα Mapping And Tomography Observations (CLAMATO)
survey observations were carried out using the Low Resolution Imaging
Spectrometer (LRIS) spectrograph on the Keck I telescope at Maunakea,
Hawai'i. The observations described in this paper were carried out in
2014-2020 via a total time allocation of 20.5 nights.
CLAMATO focused on the LRIS blue channel covering the range of
3700Å<λ<4400Å (R∼1100), which corresponds to the rest
frame Lyα at 2.1≲zα≲2.6. From the 32 unique slit-masks
observed in the 2014-2020 CLAMATO campaign, we reduced and extracted
600 spectra from the blue channel.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 103 600 The COSMOS Lyα Mapping And Tomography
Observations (CLAMATO) Data Release 2 redshift
catalog
sp/* . 619 Indiviual reduced spectra from LRIS-Blue
in FITS format
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See also:
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)
J/ApJ/675/49 : High-redshift QSOs in the SWIRE survey (Siana+, 2008)
J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)
J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)
J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)
J/ApJ/828/21 : ZFIRE v1.0 data release (Nanayakkara+, 2016)
J/ApJ/861/60 : z∼2.3 cosmic voids in the COSMOS field (Krolewski+, 2018)
J/ApJS/237/31 : CLAMATO DR1: 3D Lyα forest tomography (Lee+, 2018)
J/AJ/160/37 : IGM opacity from Lyman-break galaxies (Monzon+, 2020)
http://zenodo.org/record/7524313 : Data products for CLAMATO DR2
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 30 A30 --- FileName Name of the FITS file in subdirectory "sp" (1)
32- 38 I7 --- Seq [403/34729] CLAMATO ID number
(<[LKW2018] NNNNN> in Simbad)
40- 44 F5.2 mag gmag [20.12/25.3] Subaru g+ AB magnitude (2)
46- 49 F4.1 --- q_zspec [-3/4] Redshift confidence grade (4=very
secure, 3=secure, 2=probable, 1=insecure,
0=unidentified spectrum) (3)
51- 55 F5.3 --- zspec [0/3.52] Spectroscopic redshift as
determined from CLAMATO spectrum
57 I1 --- QSO [0/1] QSO flag (1 if QSO (19 occurrences);
0 if non-QSO)
59- 67 F9.5 deg RAdeg [149.4/150.5] Right Ascension (J2000) (2)
69- 75 F7.5 deg DEdeg [1.7/2.5] Declination (J2000) (2)
77- 80 F4.1 --- SN1 [0/35.7]?=-9 Estimated (median)
Lyα-forest S/N at 2.05<z<2.15
82- 85 F4.1 --- SN2 [0/42.2]?=-9 Estimated (median)
Lyα-forest S/N at 2.15<z<2.35
87- 90 F4.1 --- SN3 [0/49.2]?=-9 Estimated (median)
Lyα-forest S/N at 2.35<z<2.55
92- 95 F4.1 --- SNRed [-0.3/64.6]?=-9 Estimated S/N over restframe
1250Å-1350Å
97 I1 --- Tomo [0/1] Flag on whether sightline was used in
tomographic map (0 for no, 1 for yes)
99- 103 I5 s Texp [7200/53100] Exposure time on the spectrum, in
seconds (aggregate)
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Note (1): Spectrum filename as given in the spec_v0.tar.gz archive on
Zenodo: doi:10.5281/zenodo.5842842 (v2 on doi:10.5281/zenodo.7524313).
Note (2): Source positions and magnitudes from Capak+ 2007, II/284
Note (3): Redshift confidence grade, similar to that described in
Lilly+ 2007, J/ApJS/172/70 but without fractional grades.
See also Lee+ 2018, J/ApJS/237/31 (CLAMATO DR1).
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History:
From electronic version of the journal for Table 1.
Reduced spectra downloaded at: http://zenodo.org/record/7524313
References:
Lee et al. DR1. 2018ApJS..237...31L 2018ApJS..237...31L Cat. J/ApJS/237/31
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Jan-2023