J/ApJS/220/12 FMOS-COSMOS survey III. 0.7<z<2.5 galaxies (Silverman+, 2015)
The FMOS-COSMOS survey of star-forming galaxies at z∼1.6.
III. Survey design, performance, and sample characteristics.
Silverman J.D., Kashino D., Sanders D., Kartaltepe J.S., Arimoto N.,
Renzini A., Rodighiero G., Daddi E., Zahid J., Nagao T., Kewley L.J.,
Lilly S.J., Sugiyama N., Baronchelli I., Capak P., Carollo C.M., Chu J.,
Hasinger G., Ilbert O., Juneau S., Kajisawa M., Koekemoer A.M., Kovac K.,
Le Fevre O., Masters D., McCracken H.J., Onodera M., Schulze A.,
Scoville N., Strazzullo V., Taniguchi Y.
<Astrophys. J. Suppl. Ser., 220, 12 (2015)>
=2015ApJS..220...12S 2015ApJS..220...12S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Spectra, infrared ; Redshifts ; Surveys
Keywords: galaxies: general; galaxies: high-redshift; galaxies: ISM; surveys;
techniques: spectroscopic
Abstract:
We present a spectroscopic survey of galaxies in the COSMOS field
using the Fiber Multi-object Spectrograph (FMOS), a near-infrared
instrument on the Subaru Telescope. Our survey is specifically
designed to detect the Hα emission line that falls within the
H-band (1.6-1.8µm) spectroscopic window from star-forming galaxies
with 1.4<z<1.7 and Mstellar≳1010M☉. With the high multiplex
capability of FMOS, it is now feasible to construct samples of over
1000 galaxies having spectroscopic redshifts at epochs that were
previously challenging. The high-resolution mode (R∼2600) effectively
separates Hα and [NII]λ6585, thus enabling studies of the
gas-phase metallicity and photoionization state of the interstellar
medium. The primary aim of our program is to establish how star
formation depends on stellar mass and environment, both recognized as
drivers of galaxy evolution at lower redshifts. In addition to the
main galaxy sample, our target selection places priority on those
detected in the far-infrared by Herschel/PACS to assess the level of
obscured star formation and investigate, in detail, outliers from the
star formation rate (SFR)--stellar mass relation. Galaxies with
Hα detections are followed up with FMOS observations at shorter
wavelengths using the J-long (1.11-1.35µm) grating to detect
Hβ and [OIII]λ5008 which provides an assessment of the
extinction required to measure SFRs not hampered by dust, and an
indication of embedded active galactic nuclei. With 460 redshifts
measured from 1153 spectra, we assess the performance of the
instrument with respect to achieving our goals, discuss inherent
biases in the sample, and detail the emission-line properties. Our
higher-level data products, including catalogs and spectra, are
available to the community.
Description:
We report on observations carried out between 2012 March and 2013
January with Subaru/FMOS. The central square degree of COSMOS is
effectively covered with four FMOS footprints, designated as HR1-HR4
(Figure 1), using both the high-resolution H-long (1.60-1.80um;
R∼2600) and J-long (1.11-1.35um) gratings.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 156 1153 Observed Subaru/FMOS-COSMOS galaxies and
measurements
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See also:
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
J/ApJ/806/L35 : NIR spectroscopy of COSMOS FIR galaxies (Kartaltepe+, 2015)
J/ApJ/775/106 : CANDELS passive & massive early-type galaxies (Cassata+, 2013)
J/A+A/556/A55 : Multi-color phot. of star-forming galaxies (Ilbert+, 2013)
J/ApJ/761/143 : Black hole masses of z∼1.4 AGNs from SXDS (Nobuta+, 2012)
J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)
J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)
J/ApJ/751/50 : Cat. of galaxy groups from DEEP2 Redshift Survey (Gerke+ 2012)
J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011)
J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)
J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007)
J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)
http://member.ipmu.jp/fmos-cosmos/FMOS-COSMOS.html : FMOS-COSMOS home page
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [FMOS_]
6- 21 A16 --- FMOS FMOS unique identifier (JHHMMSS.s+DDMMSS)
23- 31 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
33- 39 F7.5 deg DEdeg Declination in decimal degrees (J2000)
41- 47 F7.3 --- z [0.7/2.5]?=-99 Best measurement of redshift
49 I1 --- q_z [0/4] Quality flag for z (z≥2: highly
reliable; 0=no emission line detected) (1)
51 A1 --- l_FHa Limit flag on FHa (2)
52- 58 F7.3 10-17mW/m2 FHa [0.3/23.3]?=-99 Observed Hα flux (3)
60- 65 F6.2 --- SNHa [1.5/37.1]?=-99 S/N of observed Hα flux
67- 73 F7.2 km/s FWHMHa [42/1099]?=-99 Velocity FWHM of
Hα line (4)
75- 80 F6.2 km/s e_FWHMHa ?=-99 The 1σ error in FWHMHa
82 A1 --- l_FNII Limit flag on FNII (2)
83- 89 F7.3 10-17mW/m2 FNII [0.2/24]?=-99 Observed [NII] (6584A) flux (3)
91- 96 F6.2 --- SNNII [1.5/18.1]?=-99 S/N of observed
[NII](6584Å) flux
98-103 F6.2 --- ApCor1 [1.1/5.6]?=-99 Aperture correction factor (5)
105 A1 --- l_FHb Limit flag on FHb (2)
106-112 F7.3 10-17mW/m2 FHb [0.3/19.8]?=-99 Observed Hβ flux (3)
114-119 F6.2 --- SNHb [1.5/14]?=-99 S/N of observed Hβ flux
121 A1 --- l_FOIII Limit flag on FOIII (2)
122-128 F7.3 10-17mW/m2 FOIII [0.3/36]?=-99 Observed [OIII](5007A) flux (3)
130-135 F6.2 --- SNOIII [1.6/46]?=-99 S/N of observed
[OIII](5007Å) flux
137-142 F6.2 --- ApCor2 [1.4/6.3]?=-99 Aperture correction factor (6)
144-150 F7.3 --- zCOS [0/3.4]?=-99 Redshift measurement from
zCOSMOS-deep
152-156 F5.1 --- q_zCOS [0/22.5]?=-99 Quality flag for zCOS (7)
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Note (1): Based on the S/N of the Hα detection and corroborative
information as described in Section 9. If detected then a value
between 1 and 4, otherwise 0; as follows:
1 = Presence of a single emission line with S/N between 1.5 and 3.
2 = One emission line having S/N greater than 3 and less than 5.
3 = One emission line having S/N greater than 5.
4 = One emission line having S/N greater than 5 (usually Hα) and
a second line that both confirms the redshift and has S/N greater than 1.5.
Note (2): Upper limits (non-detections) on the fluxes are given at a level
of 2σ and described in Section 8.2.
Note (3): Not corrected for aperture loss. In units of 1e-17erg/s/cm2.
A -99.0 indicate a NULL detection.
Note (4): Not deconvolved with spectral resolution.
Note (5): For Hα and [NII](6584Å) fluxes to compensate for the effect
of the aperture size and should be multiplied to the flux
measurements.
Note (6): For Hβ and [OIII](5007Å) fluxes to compensate for the effect
of the aperture size and should be multiplied to the flux
measurements.
Note (7): If observed a value of 0 or higher (with 0 being undetected).
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History:
From electronic version of the journal
References:
Kashino et al. Paper I. 2013ApJ...777L...8K 2013ApJ...777L...8K
zahid et al. Paper II. 2014ApJ...792...75Z 2014ApJ...792...75Z
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 06-Nov-2015