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Title: Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS

Abstract

We present the results of the first test plates of the extended Baryon Oscillation Spectroscopic Survey. This paper focuses on the emission line galaxies (ELG) population targetted from the Dark Energy Survey (DES) photometry. We analyse the success rate, efficiency, redshift distribution, and clustering properties of the targets. From the 9000 spectroscopic redshifts targetted, 4600 have been selected from the DES photometry. The total success rate for redshifts between 0.6 and 1.2 is 71\% and 68\% respectively for a bright and faint, on average more distant, samples including redshifts measured from a single strong emission line. We find a mean redshift of 0.8 and 0.87, with 15 and 13\% of unknown redshifts respectively for the bright and faint samples. In the redshift range 0.6

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
Contributing Org.:
DES; BOSS; DES Collaboration
OSTI Identifier:
1390286
Alternate Identifier(s):
OSTI ID: 1253006
Report Number(s):
FERMILAB-PUB-15-451-AE; arXiv:1509.07121
Journal ID: ISSN 0035-8711; 1394641
Grant/Contract Number:
AC02-07CH11359; AC02-76SF00515; AST1138766; AYA201239559; ESP2013- 48274; FPA2013-47986
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 469; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; surveys; cosmology; observations

Citation Formats

Jouvel, S., Delubac, T., Comparat, J., Camacho, H., Carnero, A., Abdalla, F. B., Kneib, J. -P., Merson, A., Lima, M., Sobreira, F., da Costa, Luiz, Prada, F., Zhu, G. B., Benoit-Levy, A., Macora, A. De La, Kuropatkin, N., Lin, H., Abbott, T. M. C., Allam, S., Banerji, M., Bertin, E., Brooks, D., Capozzi, D., Kind, M. Carrasco, Carretero, J., Castander, F. J., Cunha, C. E., Desai, S., Doel, P., Eifler, T. F., Estrada, J., Neto, A. Fausti, Flaugher, B., Fosalba, P., Frieman, J., Gaztanaga, E., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Lahav, O., Li, T. S., Maia, M. A. G., March, M., Marshall, J. L., Miquel, R., Ogando, R., Percival, W. J., Plazas, A. A., Reil, K., Romer, A. K., Roodman, A., Rykoff, E. S., Sako, M., Sanchez, E., Santiago, B., Scarpine, V., Sevilla-Noarbe, I., Soares-Santos, M., Suchyta, E., Tarle, G., Thaler, J., Thomas, D., Walker, A., Zhang, Y., and Brownstein, J. Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS. United States: N. p., 2017. Web. doi:10.1093/mnras/stx163.
Jouvel, S., Delubac, T., Comparat, J., Camacho, H., Carnero, A., Abdalla, F. B., Kneib, J. -P., Merson, A., Lima, M., Sobreira, F., da Costa, Luiz, Prada, F., Zhu, G. B., Benoit-Levy, A., Macora, A. De La, Kuropatkin, N., Lin, H., Abbott, T. M. C., Allam, S., Banerji, M., Bertin, E., Brooks, D., Capozzi, D., Kind, M. Carrasco, Carretero, J., Castander, F. J., Cunha, C. E., Desai, S., Doel, P., Eifler, T. F., Estrada, J., Neto, A. Fausti, Flaugher, B., Fosalba, P., Frieman, J., Gaztanaga, E., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Lahav, O., Li, T. S., Maia, M. A. G., March, M., Marshall, J. L., Miquel, R., Ogando, R., Percival, W. J., Plazas, A. A., Reil, K., Romer, A. K., Roodman, A., Rykoff, E. S., Sako, M., Sanchez, E., Santiago, B., Scarpine, V., Sevilla-Noarbe, I., Soares-Santos, M., Suchyta, E., Tarle, G., Thaler, J., Thomas, D., Walker, A., Zhang, Y., & Brownstein, J. Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS. United States. doi:10.1093/mnras/stx163.
Jouvel, S., Delubac, T., Comparat, J., Camacho, H., Carnero, A., Abdalla, F. B., Kneib, J. -P., Merson, A., Lima, M., Sobreira, F., da Costa, Luiz, Prada, F., Zhu, G. B., Benoit-Levy, A., Macora, A. De La, Kuropatkin, N., Lin, H., Abbott, T. M. C., Allam, S., Banerji, M., Bertin, E., Brooks, D., Capozzi, D., Kind, M. Carrasco, Carretero, J., Castander, F. J., Cunha, C. E., Desai, S., Doel, P., Eifler, T. F., Estrada, J., Neto, A. Fausti, Flaugher, B., Fosalba, P., Frieman, J., Gaztanaga, E., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Lahav, O., Li, T. S., Maia, M. A. G., March, M., Marshall, J. L., Miquel, R., Ogando, R., Percival, W. J., Plazas, A. A., Reil, K., Romer, A. K., Roodman, A., Rykoff, E. S., Sako, M., Sanchez, E., Santiago, B., Scarpine, V., Sevilla-Noarbe, I., Soares-Santos, M., Suchyta, E., Tarle, G., Thaler, J., Thomas, D., Walker, A., Zhang, Y., and Brownstein, J. Fri . "Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS". United States. doi:10.1093/mnras/stx163. https://www.osti.gov/servlets/purl/1390286.
@article{osti_1390286,
title = {Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS},
author = {Jouvel, S. and Delubac, T. and Comparat, J. and Camacho, H. and Carnero, A. and Abdalla, F. B. and Kneib, J. -P. and Merson, A. and Lima, M. and Sobreira, F. and da Costa, Luiz and Prada, F. and Zhu, G. B. and Benoit-Levy, A. and Macora, A. De La and Kuropatkin, N. and Lin, H. and Abbott, T. M. C. and Allam, S. and Banerji, M. and Bertin, E. and Brooks, D. and Capozzi, D. and Kind, M. Carrasco and Carretero, J. and Castander, F. J. and Cunha, C. E. and Desai, S. and Doel, P. and Eifler, T. F. and Estrada, J. and Neto, A. Fausti and Flaugher, B. and Fosalba, P. and Frieman, J. and Gaztanaga, E. and Gerdes, D. W. and Gruen, D. and Gruendl, R. A. and Gutierrez, G. and Honscheid, K. and James, D. J. and Kuehn, K. and Lahav, O. and Li, T. S. and Maia, M. A. G. and March, M. and Marshall, J. L. and Miquel, R. and Ogando, R. and Percival, W. J. and Plazas, A. A. and Reil, K. and Romer, A. K. and Roodman, A. and Rykoff, E. S. and Sako, M. and Sanchez, E. and Santiago, B. and Scarpine, V. and Sevilla-Noarbe, I. and Soares-Santos, M. and Suchyta, E. and Tarle, G. and Thaler, J. and Thomas, D. and Walker, A. and Zhang, Y. and Brownstein, J.},
abstractNote = {We present the results of the first test plates of the extended Baryon Oscillation Spectroscopic Survey. This paper focuses on the emission line galaxies (ELG) population targetted from the Dark Energy Survey (DES) photometry. We analyse the success rate, efficiency, redshift distribution, and clustering properties of the targets. From the 9000 spectroscopic redshifts targetted, 4600 have been selected from the DES photometry. The total success rate for redshifts between 0.6 and 1.2 is 71\% and 68\% respectively for a bright and faint, on average more distant, samples including redshifts measured from a single strong emission line. We find a mean redshift of 0.8 and 0.87, with 15 and 13\% of unknown redshifts respectively for the bright and faint samples. In the redshift range 0.6},
doi = {10.1093/mnras/stx163},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 469,
place = {United States},
year = {Fri Mar 24 00:00:00 EDT 2017},
month = {Fri Mar 24 00:00:00 EDT 2017}
}

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  • We present the results of the first test plates of the extended Baryon Oscillation Spectroscopic Survey. This paper focuses on the emission line galaxies (ELG) population targetted from the Dark Energy Survey (DES) photometry. We analyse the success rate, efficiency, redshift distribution, and clustering properties of the targets. From the 9000 spectroscopic redshifts targetted, 4600 have been selected from the DES photometry. The total success rate for redshifts between 0.6 and 1.2 is 71\% and 68\% respectively for a bright and faint, on average more distant, samples including redshifts measured from a single strong emission line. We find a meanmore » redshift of 0.8 and 0.87, with 15 and 13\% of unknown redshifts respectively for the bright and faint samples. In the redshift range 0.6« less
  • We study the clustering of galaxies detected at i < 22.5 in the Science Verification observations of the Dark Energy Survey (DES). Two-point correlation functions are measured using 2.3 × 106 galaxies over a contiguous 116 deg 2 region in five bins of photometric redshift width Δz = 0.2 in the range 0.2 < z < 1.2. The impact of photometric redshift errors is assessed by comparing results using a template-based photo-zalgorithm (BPZ) to a machine-learning algorithm (TPZ). A companion paper presents maps of several observational variables (e.g. seeing, sky brightness) which could modulate the galaxy density. Here we characterizemore » and mitigate systematic errors on the measured clustering which arise from these observational variables, in addition to others such as Galactic dust and stellar contamination. After correcting for systematic effects, we then measure galaxy bias over a broad range of linear scales relative to mass clustering predicted from the Planck Λ cold dark matter model, finding agreement with the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) measurements with χ 2 of 4.0 (8.7) with 5 degrees of freedom for the TPZ (BPZ) redshifts. Furthermore, we test a ‘linear bias’ model, in which the galaxy clustering is a fixed multiple of the predicted non-linear dark matter clustering. The precision of the data allows us to determine that the linear bias model describes the observed galaxy clustering to 2.5 percent accuracy down to scales at least 4–10 times smaller than those on which linear theory is expected to be sufficient.« less
  • Using deep narrow-band (NB) imaging and optical spectroscopy from the Keck telescope and MMT, we identify a sample of 20 emission-line galaxies at z = 0.065-0.90 where the weak auroral emission line, [O III] λ4363, is detected at ≥3σ. These detections allow us to determine the gas-phase metallicity using the 'direct' method. With electron temperature measurements, and dust attenuation corrections from Balmer decrements, we find that four of these low-mass galaxies are extremely metal-poor with 12 + log (O/H) ≤ 7.65 or one-tenth solar. Our most metal-deficient galaxy has 12 + log (O/H) = 7.24{sub −0.30}{sup +0.45} (95% confidence), similarmore » to some of the lowest metallicity galaxies identified in the local universe. We find that our galaxies are all undergoing significant star formation with average specific star formation rate (SFR) of (100 Myr){sup –1}, and that they have high central SFR surface densities (average of 0.5 M {sub ☉} yr{sup –1} kpc{sup –2}). In addition, more than two-thirds of our galaxies have between one and four nearby companions within a projected radius of 100 kpc, which we find is an excess among star-forming galaxies at z = 0.4-0.85. We also find that the gas-phase metallicities for a given stellar mass and SFR lie systematically lower than the local M {sub *}-Z-(SFR) relation by ≈0.2 dex (2σ significance). These results are partly due to selection effects, since galaxies with strong star formation and low metallicity are more likely to yield [O III] λ4363 detections. Finally, the observed higher ionization parameter and high electron density suggest that they are lower redshift analogs to typical z ≳ 1 galaxies.« less
  • The Sloan Digital Sky Survey IV extended Baryonic Oscillation Spectroscopic Survey (SDSS-IV/eBOSS) will observe 195,000 emission-line galaxies (ELGs) to measure the Baryonic Acoustic Oscillation standard ruler (BAO) at redshift 0.9. To test different ELG selection algorithms, 9,000 spectra were observed with the SDSS spectrograph as a pilot survey based on data from several imaging surveys. First, using visual inspection and redshift quality flags, we show that the automated spectroscopic redshifts assigned by the pipeline meet the quality requirements for a reliable BAO measurement. We also show the correlations between sky emission, signal-to-noise ratio in the emission lines, and redshift error.more » Then we provide a detailed description of each target selection algorithm we tested and compare them with the requirements of the eBOSS experiment. As a result, we provide reliable redshift distributions for the different target selection schemes we tested. Lastly, we determine an target selection algorithms that is best suited to be applied on DECam photometry because they fulfill the eBOSS survey efficiency requirements.« less