The fmos-cosmos survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction

D. Kashino; J. D. Silverman; G. Rodighiero; A. Renzini; N. Arimoto; E. Daddi; S. J. Lilly; D. B. Sanders; J. Kartaltepe; H. J. Zahid; T. Nagao; N. Sugiyama; P. Capak; C. M. Carollo; J. Chu; G. Hasinger; O. Ilbert; M. Kajisawa; L. J. Kewley; A. M. Koekemoer; K. Kovač; O. Le Fèvre; D. Masters; H. J. McCracken; M. Onodera; N. Scoville; V. Strazzullo; M. Symeonidis; Y. Taniguchi

doi:10.1088/2041-8205/777/1/L8

The fmos-cosmos survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction

D. Kashino, J. D. Silverman, G. Rodighiero, A. Renzini, N. Arimoto, E. Daddi, S. J. Lilly, D. B. Sanders, J. Kartaltepe, H. J. Zahid, T. Nagao, N. Sugiyama, P. Capak, C. M. Carollo, J. Chu, G. Hasinger, O. Ilbert, M. Kajisawa, L. J. Kewley, A. M. KoekemoerK. Kovač, O. Le Fèvre, D. Masters, H. J. McCracken, M. Onodera, N. Scoville, V. Strazzullo, M. Symeonidis, Y. Taniguchi

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Abstract

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 f_Hα ≳ 4 × 10 ^-17 erg cm^-2 s^-1. 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 ≲ A _Hα ≲ 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 E_star (B-V)/E_neb(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.

Original language	English
Article number	L8
Journal	Astrophysical Journal Letters
Volume	777
Issue number	1
DOIs	https://doi.org/10.1088/2041-8205/777/1/L8
Publication status	Published - 1 Nov 2013

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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., ... Taniguchi, Y. (2013). The fmos-cosmos survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction. Astrophysical Journal Letters, 777(1), Article L8. https://doi.org/10.1088/2041-8205/777/1/L8

@article{82c7b96db0f64d149b8319e3274a555e,

title = "The fmos-cosmos survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction",

abstract = "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 ≳ 4 × 10 -17 erg cm-2 s-1. 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 ≲ A Hα ≲ 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.",

keywords = "galaxies: ISM, galaxies: evolution, galaxies: general, galaxies: high-redshift, galaxies: star formation",

author = "D. Kashino and Silverman, {J. D.} and G. Rodighiero and A. Renzini and N. Arimoto and E. Daddi and Lilly, {S. J.} and Sanders, {D. B.} and J. Kartaltepe and Zahid, {H. J.} and T. Nagao and N. Sugiyama and P. Capak and Carollo, {C. M.} and J. Chu and G. Hasinger and O. Ilbert and M. Kajisawa and Kewley, {L. J.} and Koekemoer, {A. M.} and K. Kova{\v c} and {Le F{\`e}vre}, O. and D. Masters and McCracken, {H. J.} and M. Onodera and N. Scoville and V. Strazzullo and M. Symeonidis and Y. Taniguchi",

year = "2013",

month = nov,

day = "1",

doi = "10.1088/2041-8205/777/1/L8",

language = "English",

volume = "777",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

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Kashino, D, Silverman, JD, Rodighiero, G, Renzini, A, Arimoto, N, Daddi, E, Lilly, SJ, Sanders, DB, Kartaltepe, J, Zahid, HJ, Nagao, T, Sugiyama, N, Capak, P, Carollo, CM, Chu, J, Hasinger, G, Ilbert, O, Kajisawa, M, Kewley, LJ, Koekemoer, AM, Kovač, K, Le Fèvre, O, Masters, D, McCracken, HJ, Onodera, M, Scoville, N, Strazzullo, V, Symeonidis, M & Taniguchi, Y 2013, 'The fmos-cosmos survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction', Astrophysical Journal Letters, vol. 777, no. 1, L8. https://doi.org/10.1088/2041-8205/777/1/L8

TY - JOUR

T1 - The fmos-cosmos survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction

AU - Kashino, D.

AU - Silverman, J. D.

AU - Rodighiero, G.

AU - Renzini, A.

AU - Arimoto, N.

AU - Daddi, E.

AU - Lilly, S. J.

AU - Sanders, D. B.

AU - Kartaltepe, J.

AU - Zahid, H. J.

AU - Nagao, T.

AU - Sugiyama, N.

AU - Capak, P.

AU - Carollo, C. M.

AU - Chu, J.

AU - Hasinger, G.

AU - Ilbert, O.

AU - Kajisawa, M.

AU - Kewley, L. J.

AU - Koekemoer, A. M.

AU - Kovač, K.

AU - Le Fèvre, O.

AU - Masters, D.

AU - McCracken, H. J.

AU - Onodera, M.

AU - Scoville, N.

AU - Strazzullo, V.

AU - Symeonidis, M.

AU - Taniguchi, Y.

PY - 2013/11/1

Y1 - 2013/11/1

N2 - 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 ≳ 4 × 10 -17 erg cm-2 s-1. 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 ≲ A Hα ≲ 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.

AB - 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 ≳ 4 × 10 -17 erg cm-2 s-1. 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 ≲ A Hα ≲ 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.

KW - galaxies: ISM

KW - galaxies: evolution

KW - galaxies: general

KW - galaxies: high-redshift

KW - galaxies: star formation

UR - http://www.scopus.com/inward/record.url?scp=84886299586&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/777/1/L8

DO - 10.1088/2041-8205/777/1/L8

M3 - Article

SN - 2041-8205

VL - 777

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L8

ER -

The fmos-cosmos survey of star-forming galaxies at z ∼ 1.6. I. Hα-based star formation rates and dust extinction

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