The FMOS-COSMOS survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction.
KASHINO D., SILVERMAN J.D., RODIGHIERO G., RENZINI A., ARIMOTO N., DADDI E., LILLY S.J., SANDERS D.B., KARTALTEPE J., ZAHID H.J., NAGAO T., SUGIYAMA N., CAPAK P., CAROLLO C.M., CHU J., HASINGER G., ILBERT O., KAJISAWA M., KEWLEY L.J., KOEKEMOER A.M., KOVAC K., LE FEVRE O., MASTERS D., McCRACKEN H.J., ONODERA M., SCOVILLE N., STRAZZULLO V., SYMEONIDIS M. and TANIGUCHI Y.
Abstract (from CDS):
We present the first results from a near-IR spectroscopic survey of the COSMOS field, using the Fiber Multi-Object Spectrograph on the Subaru telescope, designed to characterize the star-forming galaxy population at 1.4 < z < 1.7. The high-resolution mode is implemented to detect Hα in emission between 1.6-1.8 µm with fHα ≳ 4x10–17 erg/cm2/s. Here, we specifically focus on 271 sBzK-selected galaxies that yield a Hα detection thus providing a redshift and emission line luminosity to establish the relation between star formation rate and stellar mass. With further J-band spectroscopy for 89 of these, the level of dust extinction is assessed by measuring the Balmer decrement using co-added spectra. We find that the extinction (0.6 ≲ AHα ≲ 2.5) rises with stellar mass and is elevated at high masses compared to low-redshift galaxies. Using this subset of the spectroscopic sample, we further find that the differential extinction between stellar and nebular emission Estar(B - V)/Eneb(B - V) is 0.7-0.8, dissimilar to that typically seen at low redshift. After correcting for extinction, we derive an Hα-based main sequence with a slope (0.81±0.04) and normalization similar to previous studies at these redshifts.
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galaxies: evolution - galaxies: general - galaxies: high-redshift - galaxies: ISM - galaxies: star formation
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
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10 00 28.60 +02 12 21.0
[
]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
bibcode : bibcode of the coordinates reference
236.82224 +42.12163
[
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