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J/ApJS/234/21 hCOSMOS: Hectospec survey of galaxies in COSMOS (Damjanov+, 2018)

hCOSMOS: a dense spectroscopic survey of r≤21.3 galaxies in the COSMOS field. Damjanov I., Zahid H.J., Geller M.J., Fabricant D.G., Hwang Ho S. <Astrophys. J. Suppl. Ser., 234, 21 (2018)> =2018ApJS..234...21D
ADC_Keywords: Galaxies ; Spectra, optical ; Velocity dispersion ; Stars, masses Keywords: cosmology: observations ; galaxies: distances and redshifts ; galaxies: evolution ; galaxies: fundamental parameters ; galaxies: structure ; large-scale structure of universe Abstract: We describe the hCOSMOS redshift survey of the COSMOS field conducted with the Hectospec spectrograph on the MMT. In the central 1deg2, the hCOS20.6 subset of the survey is >90% complete to a limiting magnitude r=20.6. The hCOSMOS survey includes 1701 new redshifts in the COSMOS field. We also use the total of 4362 new and remeasured objects to derive the age-sensitive Dn4000 index over the entire redshift interval 0.001≲z≲0.6. For 85% of the quiescent galaxies in hCOS20.6, we measure the central line-of-sight velocity dispersion. To explore potential uses of this survey, we combine previously measured galaxy sizes, profiles, and stellar masses with the spectroscopy. The comparison reveals the known relations among structural, kinematic, and stellar population properties. We also compare redshift and Dn4000 distributions of hCOS20.6 galaxies with SHELS; a complete spectroscopic survey of 4deg2 observed to the same depth. The redshift distributions in the two fields are very different, but the Dn4000 distribution is remarkably similar. The relation between velocity dispersion and stellar mass for massive hCOS20.6 galaxies is consistent with the local relation from the Sloan Digital Sky Survey. Using measured velocity dispersions, we test a photometric proxy calibrated to galaxies in the local universe. The systematic differences between the measured and photometric proxy velocity dispersions are correlated with galaxy dynamical and stellar population properties highlighting the importance of direct spectroscopic measurements. Description: We target galaxies with r-band magnitudes 17.77<r<21.3 in the UltraVISTA photometric catalog of Muzzin+, 2013, J/ApJS/206/8 for spectroscopy. We selected extended objects in HST images; see section 2.1 for further details. We observed hCOSMOS galaxies with Hectospec mounted on the 6.5m MMT. The Hectospec spectra cover the wavelength range 3700-9100Å at a resolution of R∼1500. We conducted observations during dark and gray nights in 2015 February, 2015 April, 2016 February, and 2016 March. We obtained 5492 science quality spectra (out of which 1405 are duplicates) in varying conditions. We include additional 275 spectra of galaxies in the COSMOS field from the Hectospec data archive. Thus, the hCOSMOS sample includes 4362 unique galaxies. Among these objects, 2661 have a redshift in the zCOSMOS (Lilly+ 2007, J/ApJS/172/70 ; 2009, J/ApJS/184/218) catalog and 1701 redshifts are completely new. For the galaxies that overlap with zCOSMOS, the Hectospec spectra yield a redshift with a smaller error along with broader wavelength coverage. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 109 4399 Photometric and spectroscopic properties of the hCOSMOS galaxy sample
See also: III/250 : The VIMOS VLT deep survey (VVDS-DEEP) (Le Fevre+ 2005) II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007) VII/203 : Las Campanas Redshift Survey (Shectman+ 1996) VII/250 : 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003) VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009) V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/MNRAS/276/1341 : Spectroscopy of E and S0 galaxies (Jorgensen+, 1995) J/ApJS/142/1 : DEEP Groth Strip Survey. II. (Simard+, 2002) J/A+A/407/423 : Coma cluster early-type galaxies. III. (Mehlert+, 2003) J/ApJ/592/728 : Lyman break galaxies at redshift z∼3 (Steidel+, 2003) J/AJ/127/2455 : Gemini Deep Deep Survey (GDDS) (Abraham+, 2004) J/A+A/418/885 : The FORS Deep Field Spectroscopic Survey (Noll+, 2004) J/ApJ/604/521 : Luminosities & masses of gal. out to z∼3 (Trujillo+, 2004) J/AJ/127/3121 : TKRS catalog of GOODS-North Field (Wirth+, 2004) J/MNRAS/371/703 : MILES library of empirical spectra (Sanchez-Blazquez+, 2006) J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007) J/MNRAS/382/109 : Massive galaxies in Extended Groth Strip (Trujillo+, 2007) J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009) J/ApJ/720/723 : Compact galaxies in the local universe (Taylor+, 2010) J/AJ/139/1857 : Sample of major galaxy pairs at z=0.08-0.38 (Woods+, 2010) J/ApJ/739/L44 : Structural data for gal. between 0.2<z<2.7 (Damjanov+, 2011) J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012) J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012) J/ApJS/206/8 : COSMOS/UltraVISTA Ks-selected catalogs v4.1 (Muzzin+, 2013) J/ApJ/762/77 : PM2GC mass-limited sample surface photom. (Poggianti+, 2013) J/MNRAS/441/203 : Massive quiescent ETG in clusters (Delaye+ 2014) J/ApJS/213/35 : SHELS: galaxy redshift survey for R≤20.6 (Geller+, 2014) J/ApJS/220/12 : FMOS-COSMOS survey III. 0.7<z<2.5 galaxies (Silverman+, 2015) J/ApJS/224/11 : SHELS: redshift survey of the F1 DLS field (Geller+, 2016) J/ApJ/821/101 : Stellar MFP for massive quiescent z<0.7 gal. (Zahid+, 2016) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg [149.4/150.8] Right Ascension (J2000) 12- 19 F8.6 deg DEdeg [1.6/2.9] Declination (J2000) 21- 29 A9 --- Inst Instrument used for spectroscopy ("hectospec", "SDSS" or "BOSS") 31- 36 I6 --- [MMS2013] [1/262338] UltraVISTA ID from Muzzin+ (2013, J/ApJS/206/8) 38- 44 F7.5 --- z [0.001/1.3] Spectroscopic redshift 46- 52 F7.5 --- e_z [0/0.0006] Uncertainty in z 54- 60 F7.2 --- Dn4000 [0.4/7.5]?=-999 Dn4000 break 62- 68 F7.2 --- e_Dn4000 [0.01/3.7]?=-999 Uncertainty in Dn4000 70- 73 I4 km/s sigma [91/950]?=-999 Measured velocity dispersion before fiber aperture correction 75- 78 I4 km/s e_sigma [6/462]?=-999 Uncertainty in sigma 80- 86 F7.2 [Msun] LogM [6.2/11.93]?=-999 Stellar mass 88- 93 F6.2 [Msun] E_LogM [0.03/0.6]?=999 Superior uncertainty in LogM 95-100 F6.2 [Msun] e_LogM [0.03/0.7]?=999 Inferior uncertainty in LogM 102-109 A8 --- Comm Comment (1)
Note (1): Comment as follows: hCOS20.6 = r<20.6mag (90% complete) (1968 occurrences); hCOSMOS = 20.6mag<r<21.3 mag (2431 occurrences).
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Mar-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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