An ALMA Multiline Survey of the Interstellar Medium of the Redshift 7.5 Quasar Host Galaxy J1342+0928

Mladen Novak, Eduardo Banados, Roberto Decarli, Fabian Walter, Bram Venemans, Marcel Neeleman, Emanuele Paolo Farina, Chiara Mazzucchelli, Chris Carilli, Xiaohui Fan, Hans Walter Rix, Feige Wang

Research output: Contribution to journalArticle

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Abstract

We use Atacama Large Millimeter Array observations of the host galaxy of the quasar ULAS J1342+0928 at z = 7.54, to study the dust continuum and far-infrared lines emitted from its interstellar medium (ISM). The Rayleigh-Jeans tail of the dust continuum is well sampled with eight different spectral setups, and from a modified blackbody fit we obtain an emissivity coefficient of β = 1.85 ±0.3. Assuming a standard dust temperature of 47 K we derive a dust mass of M dust = 0.35 ×108 M and a star formation rate of . We have >4σ detections of the , , and atomic fine structure lines and limits on the , , and emission. We also report multiple limits of CO rotational lines with J up ≥ 7, as well as a tentative 3.3σ detection of the stack of four CO lines (J up = 11, 10, 8, and 7). We find line deficits that are in agreement with local ultra-luminous infrared galaxies. Comparison of the and lines indicates that the emission arises predominantly from the neutral medium, and we estimate that the photodisassociation regions in J1342+0928 have densities ≲5 ×104 cm-3. The data suggest that ∼16% of hydrogen is in ionized form and that the H ii regions have high electron densities of n e > 180 cm-3. Our observations favor a low gas-to-dust ratio of <100, and a metallicity of the ISM comparable to the solar value. All the measurements presented here suggest that the host galaxy of J1342+0928 is highly enriched in metal and dust, despite being observed just 680 Myr after the big bang.

Original languageEnglish (US)
Article number63
JournalAstrophysical Journal
Volume881
Issue number1
DOIs
StatePublished - Aug 10 2019

Fingerprint

quasars
dust
galaxies
continuums
M stars
star formation rate
emissivity
electron density
metallicity
fine structure
hydrogen
metal
coefficients
estimates
gases
gas
metals
temperature

Keywords

  • cosmology: observations
  • galaxies: high-redshift
  • galaxies: individual (ULAS J1342+0928)
  • galaxies: ISM
  • quasars: emission lines

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Novak, M., Banados, E., Decarli, R., Walter, F., Venemans, B., Neeleman, M., ... Wang, F. (2019). An ALMA Multiline Survey of the Interstellar Medium of the Redshift 7.5 Quasar Host Galaxy J1342+0928. Astrophysical Journal, 881(1), [63]. https://doi.org/10.3847/1538-4357/ab2beb

An ALMA Multiline Survey of the Interstellar Medium of the Redshift 7.5 Quasar Host Galaxy J1342+0928. / Novak, Mladen; Banados, Eduardo; Decarli, Roberto; Walter, Fabian; Venemans, Bram; Neeleman, Marcel; Farina, Emanuele Paolo; Mazzucchelli, Chiara; Carilli, Chris; Fan, Xiaohui; Rix, Hans Walter; Wang, Feige.

In: Astrophysical Journal, Vol. 881, No. 1, 63, 10.08.2019.

Research output: Contribution to journalArticle

Novak, M, Banados, E, Decarli, R, Walter, F, Venemans, B, Neeleman, M, Farina, EP, Mazzucchelli, C, Carilli, C, Fan, X, Rix, HW & Wang, F 2019, 'An ALMA Multiline Survey of the Interstellar Medium of the Redshift 7.5 Quasar Host Galaxy J1342+0928', Astrophysical Journal, vol. 881, no. 1, 63. https://doi.org/10.3847/1538-4357/ab2beb
Novak, Mladen ; Banados, Eduardo ; Decarli, Roberto ; Walter, Fabian ; Venemans, Bram ; Neeleman, Marcel ; Farina, Emanuele Paolo ; Mazzucchelli, Chiara ; Carilli, Chris ; Fan, Xiaohui ; Rix, Hans Walter ; Wang, Feige. / An ALMA Multiline Survey of the Interstellar Medium of the Redshift 7.5 Quasar Host Galaxy J1342+0928. In: Astrophysical Journal. 2019 ; Vol. 881, No. 1.
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abstract = "We use Atacama Large Millimeter Array observations of the host galaxy of the quasar ULAS J1342+0928 at z = 7.54, to study the dust continuum and far-infrared lines emitted from its interstellar medium (ISM). The Rayleigh-Jeans tail of the dust continuum is well sampled with eight different spectral setups, and from a modified blackbody fit we obtain an emissivity coefficient of β = 1.85 ±0.3. Assuming a standard dust temperature of 47 K we derive a dust mass of M dust = 0.35 ×108 M and a star formation rate of . We have >4σ detections of the , , and atomic fine structure lines and limits on the , , and emission. We also report multiple limits of CO rotational lines with J up ≥ 7, as well as a tentative 3.3σ detection of the stack of four CO lines (J up = 11, 10, 8, and 7). We find line deficits that are in agreement with local ultra-luminous infrared galaxies. Comparison of the and lines indicates that the emission arises predominantly from the neutral medium, and we estimate that the photodisassociation regions in J1342+0928 have densities ≲5 ×104 cm-3. The data suggest that ∼16{\%} of hydrogen is in ionized form and that the H ii regions have high electron densities of n e > 180 cm-3. Our observations favor a low gas-to-dust ratio of <100, and a metallicity of the ISM comparable to the solar value. All the measurements presented here suggest that the host galaxy of J1342+0928 is highly enriched in metal and dust, despite being observed just 680 Myr after the big bang.",
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AU - Banados, Eduardo

AU - Decarli, Roberto

AU - Walter, Fabian

AU - Venemans, Bram

AU - Neeleman, Marcel

AU - Farina, Emanuele Paolo

AU - Mazzucchelli, Chiara

AU - Carilli, Chris

AU - Fan, Xiaohui

AU - Rix, Hans Walter

AU - Wang, Feige

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KW - galaxies: individual (ULAS J1342+0928)

KW - galaxies: ISM

KW - quasars: emission lines

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