The identification of z-dropouts in pan-starrs1: Three quasars at 6.5< z< 6.7

B. P. Venemans, E. Bañados, R. Decarli, E. P. Farina, F. Walter, K. C. Chambers, Xiaohui Fan, H. W. Rix, E. Schlafly, R. G. McMahon, R. Simcoe, D. Stern, W. S. Burgett, P. W. Draper, H. Flewelling, K. W. Hodapp, N. Kaiser, E. A. Magnier, N. Metcalfe, J. S. MorganP. A. Price, J. L. Tonry, C. Waters, Y. Alsayyad, M. Banerji, S. S. Chen, E. A. González-Solares, J. Greiner, C. Mazzucchelli, I. McGreer, D. R. Miller, S. Reed, P. W. Sullivan

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Luminous distant quasars are unique probes of the high-redshift intergalactic medium (IGM) and of the growth of massive galaxies and black holes in the early universe. Absorption due to neutral hydrogen in the IGM makes quasars beyond a redshift of z ≃ 6.5 very faint in the optical z band, thus locating quasars at higher redshifts requires large surveys that are sensitive above 1 micron. We report the discovery of three new z > 6.5 quasars, corresponding to an age of the universe of <850 Myr, selected as z-band dropouts in the Pan- STARRS1 survey. This increases the number of known z > 6.5 quasars from four to seven. The quasars have redshifts of z = 6.50, 6.52, and 6.66, and include the brightest z-dropout quasar reported to date, PSO J036.5078 + 03.0498 with M1450 = -27.4. We obtained near-infrared spectroscopy for the quasars, and from the Mg II line, we estimate that the central black holes have masses between 5 × 108 and 4 × 109 M⊙ and are accreting close to the Eddington limit (LBol LEdd = 0.13 - 1.2). We investigate the ionized regions around the quasars and find near-zone radii of RNZ = 1.5 - 5.2 proper Mpc, confirming the trend of decreasing near-zone sizes with increasing redshift found for quasars at 5.7 < z < 6.4. By combining RNZ of the PS1 quasars with those of 5.7 < z < 7.1 quasars in the literature, we derive a luminosity-corrected redshift evolution of RNZ,corrected = (7.2 ± 0.2) - (6.1 ± 0.7) × (z - 6) Mpc. However, the large spread in RNZ in the new quasars implies a wide range in quasar ages and/or a large variation in the neutral hydrogen fraction along different lines of sight.

Original languageEnglish (US)
Article numberL11
JournalAstrophysical Journal Letters
Volume801
Issue number1
DOIs
StatePublished - Mar 1 2015

Fingerprint

dropouts
quasars
hydrogen
infrared spectroscopy
near infrared
probe
intergalactic media
universe
luminosity
trend
line of sight

Keywords

  • cosmology: observations
  • galaxies: active
  • galaxies: individual (PSO J036.5078+03.0498, PSO J167.6415-13.4960, PSO J338.2298+29.5089)
  • quasars: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Venemans, B. P., Bañados, E., Decarli, R., Farina, E. P., Walter, F., Chambers, K. C., ... Sullivan, P. W. (2015). The identification of z-dropouts in pan-starrs1: Three quasars at 6.5< z< 6.7. Astrophysical Journal Letters, 801(1), [L11]. https://doi.org/10.1088/2041-8205/801/1/L11

The identification of z-dropouts in pan-starrs1 : Three quasars at 6.5< z< 6.7. / Venemans, B. P.; Bañados, E.; Decarli, R.; Farina, E. P.; Walter, F.; Chambers, K. C.; Fan, Xiaohui; Rix, H. W.; Schlafly, E.; McMahon, R. G.; Simcoe, R.; Stern, D.; Burgett, W. S.; Draper, P. W.; Flewelling, H.; Hodapp, K. W.; Kaiser, N.; Magnier, E. A.; Metcalfe, N.; Morgan, J. S.; Price, P. A.; Tonry, J. L.; Waters, C.; Alsayyad, Y.; Banerji, M.; Chen, S. S.; González-Solares, E. A.; Greiner, J.; Mazzucchelli, C.; McGreer, I.; Miller, D. R.; Reed, S.; Sullivan, P. W.

In: Astrophysical Journal Letters, Vol. 801, No. 1, L11, 01.03.2015.

Research output: Contribution to journalArticle

Venemans, BP, Bañados, E, Decarli, R, Farina, EP, Walter, F, Chambers, KC, Fan, X, Rix, HW, Schlafly, E, McMahon, RG, Simcoe, R, Stern, D, Burgett, WS, Draper, PW, Flewelling, H, Hodapp, KW, Kaiser, N, Magnier, EA, Metcalfe, N, Morgan, JS, Price, PA, Tonry, JL, Waters, C, Alsayyad, Y, Banerji, M, Chen, SS, González-Solares, EA, Greiner, J, Mazzucchelli, C, McGreer, I, Miller, DR, Reed, S & Sullivan, PW 2015, 'The identification of z-dropouts in pan-starrs1: Three quasars at 6.5< z< 6.7', Astrophysical Journal Letters, vol. 801, no. 1, L11. https://doi.org/10.1088/2041-8205/801/1/L11
Venemans BP, Bañados E, Decarli R, Farina EP, Walter F, Chambers KC et al. The identification of z-dropouts in pan-starrs1: Three quasars at 6.5< z< 6.7. Astrophysical Journal Letters. 2015 Mar 1;801(1). L11. https://doi.org/10.1088/2041-8205/801/1/L11
Venemans, B. P. ; Bañados, E. ; Decarli, R. ; Farina, E. P. ; Walter, F. ; Chambers, K. C. ; Fan, Xiaohui ; Rix, H. W. ; Schlafly, E. ; McMahon, R. G. ; Simcoe, R. ; Stern, D. ; Burgett, W. S. ; Draper, P. W. ; Flewelling, H. ; Hodapp, K. W. ; Kaiser, N. ; Magnier, E. A. ; Metcalfe, N. ; Morgan, J. S. ; Price, P. A. ; Tonry, J. L. ; Waters, C. ; Alsayyad, Y. ; Banerji, M. ; Chen, S. S. ; González-Solares, E. A. ; Greiner, J. ; Mazzucchelli, C. ; McGreer, I. ; Miller, D. R. ; Reed, S. ; Sullivan, P. W. / The identification of z-dropouts in pan-starrs1 : Three quasars at 6.5< z< 6.7. In: Astrophysical Journal Letters. 2015 ; Vol. 801, No. 1.
@article{1f3f02ebfab4451aa244360112eee54a,
title = "The identification of z-dropouts in pan-starrs1: Three quasars at 6.5< z< 6.7",
abstract = "Luminous distant quasars are unique probes of the high-redshift intergalactic medium (IGM) and of the growth of massive galaxies and black holes in the early universe. Absorption due to neutral hydrogen in the IGM makes quasars beyond a redshift of z ≃ 6.5 very faint in the optical z band, thus locating quasars at higher redshifts requires large surveys that are sensitive above 1 micron. We report the discovery of three new z > 6.5 quasars, corresponding to an age of the universe of <850 Myr, selected as z-band dropouts in the Pan- STARRS1 survey. This increases the number of known z > 6.5 quasars from four to seven. The quasars have redshifts of z = 6.50, 6.52, and 6.66, and include the brightest z-dropout quasar reported to date, PSO J036.5078 + 03.0498 with M1450 = -27.4. We obtained near-infrared spectroscopy for the quasars, and from the Mg II line, we estimate that the central black holes have masses between 5 × 108 and 4 × 109 M⊙ and are accreting close to the Eddington limit (LBol LEdd = 0.13 - 1.2). We investigate the ionized regions around the quasars and find near-zone radii of RNZ = 1.5 - 5.2 proper Mpc, confirming the trend of decreasing near-zone sizes with increasing redshift found for quasars at 5.7 < z < 6.4. By combining RNZ of the PS1 quasars with those of 5.7 < z < 7.1 quasars in the literature, we derive a luminosity-corrected redshift evolution of RNZ,corrected = (7.2 ± 0.2) - (6.1 ± 0.7) × (z - 6) Mpc. However, the large spread in RNZ in the new quasars implies a wide range in quasar ages and/or a large variation in the neutral hydrogen fraction along different lines of sight.",
keywords = "cosmology: observations, galaxies: active, galaxies: individual (PSO J036.5078+03.0498, PSO J167.6415-13.4960, PSO J338.2298+29.5089), quasars: general",
author = "Venemans, {B. P.} and E. Ba{\~n}ados and R. Decarli and Farina, {E. P.} and F. Walter and Chambers, {K. C.} and Xiaohui Fan and Rix, {H. W.} and E. Schlafly and McMahon, {R. G.} and R. Simcoe and D. Stern and Burgett, {W. S.} and Draper, {P. W.} and H. Flewelling and Hodapp, {K. W.} and N. Kaiser and Magnier, {E. A.} and N. Metcalfe and Morgan, {J. S.} and Price, {P. A.} and Tonry, {J. L.} and C. Waters and Y. Alsayyad and M. Banerji and Chen, {S. S.} and Gonz{\'a}lez-Solares, {E. A.} and J. Greiner and C. Mazzucchelli and I. McGreer and Miller, {D. R.} and S. Reed and Sullivan, {P. W.}",
year = "2015",
month = "3",
day = "1",
doi = "10.1088/2041-8205/801/1/L11",
language = "English (US)",
volume = "801",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - The identification of z-dropouts in pan-starrs1

T2 - Three quasars at 6.5< z< 6.7

AU - Venemans, B. P.

AU - Bañados, E.

AU - Decarli, R.

AU - Farina, E. P.

AU - Walter, F.

AU - Chambers, K. C.

AU - Fan, Xiaohui

AU - Rix, H. W.

AU - Schlafly, E.

AU - McMahon, R. G.

AU - Simcoe, R.

AU - Stern, D.

AU - Burgett, W. S.

AU - Draper, P. W.

AU - Flewelling, H.

AU - Hodapp, K. W.

AU - Kaiser, N.

AU - Magnier, E. A.

AU - Metcalfe, N.

AU - Morgan, J. S.

AU - Price, P. A.

AU - Tonry, J. L.

AU - Waters, C.

AU - Alsayyad, Y.

AU - Banerji, M.

AU - Chen, S. S.

AU - González-Solares, E. A.

AU - Greiner, J.

AU - Mazzucchelli, C.

AU - McGreer, I.

AU - Miller, D. R.

AU - Reed, S.

AU - Sullivan, P. W.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - Luminous distant quasars are unique probes of the high-redshift intergalactic medium (IGM) and of the growth of massive galaxies and black holes in the early universe. Absorption due to neutral hydrogen in the IGM makes quasars beyond a redshift of z ≃ 6.5 very faint in the optical z band, thus locating quasars at higher redshifts requires large surveys that are sensitive above 1 micron. We report the discovery of three new z > 6.5 quasars, corresponding to an age of the universe of <850 Myr, selected as z-band dropouts in the Pan- STARRS1 survey. This increases the number of known z > 6.5 quasars from four to seven. The quasars have redshifts of z = 6.50, 6.52, and 6.66, and include the brightest z-dropout quasar reported to date, PSO J036.5078 + 03.0498 with M1450 = -27.4. We obtained near-infrared spectroscopy for the quasars, and from the Mg II line, we estimate that the central black holes have masses between 5 × 108 and 4 × 109 M⊙ and are accreting close to the Eddington limit (LBol LEdd = 0.13 - 1.2). We investigate the ionized regions around the quasars and find near-zone radii of RNZ = 1.5 - 5.2 proper Mpc, confirming the trend of decreasing near-zone sizes with increasing redshift found for quasars at 5.7 < z < 6.4. By combining RNZ of the PS1 quasars with those of 5.7 < z < 7.1 quasars in the literature, we derive a luminosity-corrected redshift evolution of RNZ,corrected = (7.2 ± 0.2) - (6.1 ± 0.7) × (z - 6) Mpc. However, the large spread in RNZ in the new quasars implies a wide range in quasar ages and/or a large variation in the neutral hydrogen fraction along different lines of sight.

AB - Luminous distant quasars are unique probes of the high-redshift intergalactic medium (IGM) and of the growth of massive galaxies and black holes in the early universe. Absorption due to neutral hydrogen in the IGM makes quasars beyond a redshift of z ≃ 6.5 very faint in the optical z band, thus locating quasars at higher redshifts requires large surveys that are sensitive above 1 micron. We report the discovery of three new z > 6.5 quasars, corresponding to an age of the universe of <850 Myr, selected as z-band dropouts in the Pan- STARRS1 survey. This increases the number of known z > 6.5 quasars from four to seven. The quasars have redshifts of z = 6.50, 6.52, and 6.66, and include the brightest z-dropout quasar reported to date, PSO J036.5078 + 03.0498 with M1450 = -27.4. We obtained near-infrared spectroscopy for the quasars, and from the Mg II line, we estimate that the central black holes have masses between 5 × 108 and 4 × 109 M⊙ and are accreting close to the Eddington limit (LBol LEdd = 0.13 - 1.2). We investigate the ionized regions around the quasars and find near-zone radii of RNZ = 1.5 - 5.2 proper Mpc, confirming the trend of decreasing near-zone sizes with increasing redshift found for quasars at 5.7 < z < 6.4. By combining RNZ of the PS1 quasars with those of 5.7 < z < 7.1 quasars in the literature, we derive a luminosity-corrected redshift evolution of RNZ,corrected = (7.2 ± 0.2) - (6.1 ± 0.7) × (z - 6) Mpc. However, the large spread in RNZ in the new quasars implies a wide range in quasar ages and/or a large variation in the neutral hydrogen fraction along different lines of sight.

KW - cosmology: observations

KW - galaxies: active

KW - galaxies: individual (PSO J036.5078+03.0498, PSO J167.6415-13.4960, PSO J338.2298+29.5089)

KW - quasars: general

UR - http://www.scopus.com/inward/record.url?scp=84924144473&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84924144473&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/801/1/L11

DO - 10.1088/2041-8205/801/1/L11

M3 - Article

AN - SCOPUS:84924144473

VL - 801

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 1

M1 - L11

ER -