J/ApJ/903/24 Lyα emitters and QSOs in COMSOS and EGS fields (Mukae+, 2020)
Cosmological 3D HI Map with HETDEX Lyα Emitters and eBOSS QSOs at
z=2; IGM-Galaxy/QSO Connection and a ∼40Mpc Scale Giant HII Bubble Candidate
Mukae S., Ouchi M., Hill G.J., Gebhardt K., Cooper E.M., Jeong D.,
Saito S., Fabricius M., Gawiser E., Ciardullo R., Farrow D., Davis D.,
Zeimann G., Finkelstein S.L., Gronwall C., Liu C., Zhang Y., Byrohl C., Ono
Y., Schneider D.P., Jarvis M.J., Casey C.M., Mawatari K.
<Astrophys. J., 903, 24 (2020)>
=2020ApJ...903...24M 2020ApJ...903...24M
ADC_Keywords: Intergalactic medium; QSOs; Galaxies; Redshifts; Spectra, optical
Keywords: Galaxy formation ; Intergalactic medium ; Large-scale structure
of the universe
Abstract:
We present cosmological (30-400Mpc) distributions of neutral hydrogen
(HI) in the intergalactic medium (IGM) traced by Lyα emitters
(LAEs) and QSOs at z=2.1-2.5, selected with the data of the ongoing
Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) and the eBOSS
survey. Motivated by a previous study of Mukae et al., we investigate
spatial correlations of LAEs and QSOs with HI tomography maps
reconstructed from HI Lyα forest absorption in the spectra of
background galaxies and QSOs obtained by the CLAMATO survey and this
study, respectively. In the cosmological volume far from QSOs, we find
that LAEs reside in regions of strong HI absorption, i.e., HI rich,
which is consistent with results of previous galaxy-background QSO
pair studies. Moreover, there is an anisotropy in the HI distribution
plot of transverse and line-of-sight distances; on average the HI
absorption peak is blueshifted by ∼200km/s from the LAE Lyα
redshift, reproducing the known average velocity offset between the
Lyα emission redshift and the galaxy systemic redshift. We have
identified a ∼40Mpc scale volume of HI underdensity that is a
candidate for a giant HII bubble, where six QSOs and an LAE
overdensity exist at =2.16. The coincidence of the QSO and LAE
overdensities with the HI underdensity indicates that the ionizing
photon radiation of the QSOs has created a highly ionized volume of
multiple proximity zones in a matter overdensity. Our results suggest
an evolutionary picture where H i gas in an overdensity of galaxies
becomes highly photoionized when QSOs emerge in the galaxies.
Description:
Two catalogs of foreground galaxies are drawn from samples of
Lyα emitters (LAEs) in the COSMOS and EGS regions. The COSMOS
and EGS LAE catalogs are constructed from early observations of
HETDEX, obtained with the Visible Integral-field Replicable Unit
Spectrograph (VIRUS) on the upgraded 10m Hobby-Eberly Telescope (HET).
The HET is an innovative telescope with an 11m segmented primary
mirror, located in West Texas at the McDonald Observatory. VIRUS is a
massively replicated integral field spectrograph, designed for blind
spectroscopic surveys. It consists of 78 fiber integral field units
(IFUs) distributed within the 22' diameter field of view of the
telescope. A detailed technical description of the HET wide-field
upgrade and VIRUS is presented in Hill et al. (2020, in preparation).
Each IFU feeds 448 fibers with diameter 1.5" to a pair of
spectrographs. The spectrographs have a fixed spectral bandpass of
3500-5500Å and a spectral resolution of ∼800. The HETDEX program is
performing a blind emission-line survey over a total of ∼450deg2
area with a standard exposure set of 3x6min dithers and aims to
identify 106 LAEs at Lyα emission redshifts of
zLyα=1.9-3.5 in a 9Gpc3 volume. The HETDEX survey constructs
an emission-line database where emission-line detections are processed
in combination with broadband imaging data, including data from
Subaru/Hyper Suprime-Cam (HSC).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 64 27 HETDEX LAEs in the COSMOS Field
table3.dat 69 26 HETDEX LAEs in the EGS field
table4.dat 47 78 Foreground QSOs in the EGS field
table5.dat 53 43 Background QSOs in the EGS field
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See also:
VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)
VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)
J/A+A/547/L1 : SDSS-III DR9 DLA catalogue (Noterdaeme+, 2012)
J/ApJS/237/31 : CLAMATO DR1: 3D Lyα forest tomography (Lee+, 2018)
J/ApJ/884/151 : Lyman cont. luminosity SDSS quasar pairs at z∼3 (Jalan+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- HETDEX Identifier
28- 29 I2 h RAh [10] Hour of right ascension (J2000)
31- 32 I2 min RAm [0/1] Minute of right ascension (J2000)
34- 38 F5.2 s RAs Second of right ascension (J2000)
40 A1 --- DE- [+] Sign of declination (J2000)
42- 43 I2 deg DEd [2] Degree of declination (J2000)
45- 46 I2 arcmin DEm [11/22] Arcminute of declination (J2000)
48- 52 F5.2 arcsec DEs Arcsecond of declination (J2000)
54- 58 F5.3 --- z [2.09/2.51] Redshift at Lyα emission line
60- 64 F5.2 --- Lum [6.34/24.7] Luminosity at Lyα (1042erg/s)
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 26 A26 --- HETDEX Identifier
28- 29 I2 h RAh [14] Hour of right ascension (J2000)
31- 32 I2 min RAm [17/23] Minute of right ascension (J2000)
34- 38 F5.2 s RAs Second of right ascension (J2000)
40 A1 --- DE- [+] Sign of declination (J2000)
42- 43 I2 deg DEd [52/53] Degree of declination (J2000)
45- 46 I2 arcmin DEm Arcminute of declination (J2000)
48- 52 F5.2 arcsec DEs Arcsecond of declination (J2000)
54- 58 F5.3 --- z [2.05/2.54] Redshift at Lyα emission line
60- 64 F5.2 --- Lum [6.33/39.3] Luminosity at Lyα (1042erg/s)
66- 69 A4 --- Label LAE(1-4) reside in the QSO overdensity, EGS-QO1
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- QSO QSO identifier (1)
17- 18 I2 h RAh [14] Hour of right ascension (J2000)
20- 21 I2 min RAm [14/25] Minute of right ascension (J2000)
23- 27 F5.2 s RAs Second of right ascension (J2000)
29 A1 --- DE- [+] Sign of declination (J2000)
31- 32 I2 deg DEd [52/53] Degree of declination (J2000)
34- 35 I2 arcmin DEm Arcminute of declination (J2000)
37- 41 F5.2 arcsec DEs Arcsecond of declination (J2000)
43- 47 F5.3 --- z [2.05/2.55] Spectroscopic redshift
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Note (1): Identifier built as follows: Plate-MJD-Fiber from the SDSS
quasar catalog DR14 (Paris, 2018, VII/286)
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- QSO QSO identifier (1)
17- 18 I2 h RAh [14] Hour of right ascension (J2000)
20- 21 I2 min RAm [14/25] Minute of right ascension (J2000)
23- 27 F5.2 s RAs Second of right ascension (J2000)
29 A1 --- DE- [+] Sign of declination (J2000)
31- 32 I2 deg DEd [52/53] Degree of declination (J2000)
34- 35 I2 arcmin DEm Arcminute of declination (J2000)
37- 41 F5.2 arcsec DEs Arcsecond of declination (J2000)
43- 47 F5.3 --- z [2.15/3.11] Spectroscopic redshift
49- 53 F5.2 mag gmag [18.2/22] g-band magnitude in AB system
--------------------------------------------------------------------------------
Note (1): Identifier built as follows: Plate-MJD-Fiber from the SDSS
quasar catalog DR14 (Paris, 2018, VII/286)
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 28-Feb-2022