J/ApJ/945/94 HectoMAP: the complete redshift survey (DR2) (Sohn+, 2023)
HectoMAP: the complete redshift survey (Data Release 2).
Sohn J., Geller M.J., Hwang Ho S., Fabricant D.G., Utsumi Y., Damjanov I.
<Astrophys. J., 945, 94 (2023)>
=2023ApJ...945...94S 2023ApJ...945...94S
ADC_Keywords: Redshifts; Surveys; Spectra, optical; Photometry;
Galaxies, spectra
Keywords: Redshift surveys ; Large-scale structure of the universe ;
Galaxy clusters
Abstract:
HectoMAP is a dense redshift survey of 95403 galaxies based primarily
on MMT spectroscopy with a median redshift z=0.345. The survey covers
54.64deg2 in a 1.5° wide strip across the northern sky centered
at a decl. of 43.25°. We report the redshift, the spectral
indicator Dn4000, and the stellar mass. The red-selected survey is 81%
complete for 55,962 galaxies with (g-r)>1 and r<20.5; it is 72%
complete for 32,908 galaxies with (g-r)>1, (r-i)>0.5 and 20.5<r<21.3.
Comparison of the survey basis SDSS photometry with the HSC-SSP
photometry demonstrates that HectoMAP provides complete
magnitude-limited surveys based on either photometric system. We
update the comparison between the HSC-SSP photometric redshifts with
HectoMAP spectroscopic redshifts; the comparison demonstrates that the
HSC-SSP photometric redshifts have improved between the second and
third data releases. HectoMAP is a foundation for examining the
quiescent galaxy population (63% of the survey), clusters of galaxies,
and the cosmic web. HectoMAP is completely covered by the HSC-SSP
survey, thus enabling a variety of strong- and weak-lensing
investigations.
Description:
Galaxy selection for the HectoMAP spectroscopic survey is based on
SDSS DR16 photometry (Ahumada+ 2020, V/154). We base the survey on
SDSS ugriz Petrosian magnitudes after foreground-extinction correction.
See Section 2.1.1.
HectoMAP is covered by the HSC-SSP wide survey
(Miyazaki+ 2012SPIE.8446E..0ZM), which provides deep photometry to a
5σ depth of 26.5, 26.5, 26.2, 25.2, and 24.4mag in the g, r, i,
z, and y bands for point sources, respectively. We use the HSC-SSP
Public DR3 (Aihara+ 2022PASJ...74..247A 2022PASJ...74..247A). The HSC-SSP DR3 includes the
complete HectoMAP survey region in the g, r, and z bands.
See Section 2.1.2.
The HectoMAP survey includes redshifts for 95403 unique galaxies;
88294 of these redshifts are MMT/Hectospec observations (Section 2.2.2).
Particularly at redshifts z<0.2, SDSS complements the HectoMAP data
(Section 2.2.1). The NASA Extragalactic Database adds only a few
(375) unique redshifts in the HectoMAP survey region.
The SDSS spectra cover the wavelength range 3700-9100Å with a
typical spectral resolution of ∼3Å. The typical uncertainty of the
SDSS redshifts we use is 8km/s. There are also 2802 unique SDSS/BOSS
redshifts in the HectoMAP region. BOSS spectra cover the wavelength
range 3600-10400Å with generally larger (∼39km/s) uncertainties.
The 270mm-1 MMT/Hectospec grating yields a typical resolution of
∼6Å and covers the wavelength range 3700-9100Å. We made HectoMAP
observations from 2009 January to 2019 May.
Table 4 lists the 6544 stars with spectroscopy. There are 4253 stars
that were identified as point sources based on the SDSS database.
Additionally, we spectroscopically identify 2291 stars originally
identified as extended sources based on the SDSS database (hereafter,
spectroscopically identified stars). See the Appendix.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 157 95405 The HectoMAP redshift survey
table4.dat 79 6544 Radial velocities for stars in HectoMAP
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See also:
VII/203 : Las Campanas Redshift Survey (Shectman+ 1996)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/AJ/139/1857 : Sample of major galaxy pairs at z=0.08-0.38 (Woods+, 2010)
J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012)
J/ApJ/750/168 : Redshift survey in Subaru GTO2deg2 field (Kurtz+, 2012)
J/ApJS/213/35 : SHELS: complete galaxy z survey for R≤20.6 (Geller+, 2014)
J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)
J/ApJS/224/11 : SHELS: redshift survey of the F1 DLS field (Geller+, 2016)
J/ApJ/819/63 : Hectospec survey of SZ clusters (HeCS-SZ) (Rines+, 2016)
J/ApJS/224/1 : redMaPPer cluster catalog from DES data (Rykoff+, 2016)
J/ApJS/229/20 : MMT/Hectospec redshift survey for Abell 2029 (Sohn+, 2017)
J/ApJS/234/21 : hCOSMOS: Hectospec survey of COSMOS gal. (Damjanov+, 2018)
J/ApJ/855/100 : HectoMAP cluster survey. II. X-ray clusters (Sohn+, 2018)
J/ApJ/856/172 : The HectoMAP cluster survey. I. (Sohn+, 2018)
J/MNRAS/495/1291 : SuGOHI. V. Group-to-cluster scale lenses (Jaelani+, 2020)
J/ApJ/923/143 : HectoMAP Cluster Survey: clusters & BCGs (Sohn+, 2021)
J/ApJ/909/129 : HectoMAP redshift survey DR1 (Sohn+, 2021)
J/ApJ/929/61 : Quiescent galaxies from SHELS and SDSS (Damjanov+, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- ObjID SDSS DR16 Object ID
21- 30 F10.6 deg RAdeg [200/250] Right Ascension (J2000)
32- 40 F9.6 deg DEdeg [42.5/44] Declination (J2000)
42- 50 F9.6 --- zspec [-0.0004/7.02] Spectroscopic redshift
52- 60 F9.6 --- e_zspec [3e-06/42] Redshift uncertainty
62- 66 F5.2 mag rPmag0 [12.29/23] SDSS Petrosian r-band magnitude
68- 72 F5.2 mag e_rPmag0 [0/58] rPmag0 uncertainty
74- 79 F6.2 mag rMAG [-31.7/-6.6] K-corrected r-band absolute cModel
magnitude (1)
81- 86 F6.2 mag rmag0 [12.24/23.24]?=-99 SDSS cModel r-band magnitude
88- 93 F6.2 mag e_rmag0 [0/1.38]?=-99 rmag0 uncertainty
95- 99 F5.2 mag g-r0 [-3.7/11.8] SDSS g-r cModel color index
101-105 F5.2 mag rmagHSC0 [0/23.85] HSC/SSP DR3 r-band cModel magnitude
107-110 F4.2 mag e_rmagHSC0 [0.01/0.5] rmagHSC0 uncertainty
112-117 F6.2 mag g-rHSC0 [-2.4/7.8]?=-99 HSC/SSP DR3 g-r cModel color
119-124 F6.2 --- Dn4000 [0.02/9.96]?=-99 Spectral indicator Dn4000;
see Section 3.1
126-131 F6.2 --- e_Dn4000 [0/9.9]?=-99 Dn4000 uncertainty
133-138 F6.2 [Msun] logMs [7/12.3]?=-99 Stellar mass in log scale;
see Section 3.2
140-145 F6.2 [Msun] E_logMs [0/1.1]?=-99 logMs upper uncertainty
147-152 F6.2 [Msun] e_logMs [0/0.9]?=-99 logMs lower uncertainty
154-157 A4 --- r_zspec Redshift Source (2)
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Note (1): K-correction at z=0.35; see Section 3.3.
Note (2): Source(s) of the spectroscopy as follows:
BOSS = SDSS/BOSS (Section 2.2.1; 2802 occurrences);
MMT = MMT/Hectospec observations (Section 2.2.2; 88296 occurrences);
NED = NASA Extragalactic Database (375 occurrences);
SDSS = SDSS Main Galaxy Sample (Section 2.2.1; 3932 occurrences).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- ObjID SDSS DR16 Object ID
21- 30 F10.6 deg RAdeg [200/250] Right Ascension (J2000)
32- 40 F9.6 deg DEdeg [42.5/44] Declination (J2000)
42- 49 F8.2 km/s cz [-1240/1367.5] Radial velocity (cz) of stars
51- 58 F8.2 km/s e_cz [0/95365]?=-9.99 cz uncertainty
60- 64 F5.2 mag rmag0 [10.48/32] Petrosian r-band magnitude
66- 70 F5.2 mag e_rmag0 [0/69.5] rmag0 uncertainty
72- 79 A8 --- Flag Classified as "Point" or "Extended" sources
by SDSS
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 31-Jan-2025