Imaging the cold molecular gas in SDSS J1148 + 5251 at z = 6.4

Irina I. Stefan, Chris L. Carilli, Jeff Wagg, Fabian Walter, Dominik A. Riechers, Frank Bertoldi, David A. Green, Xiaohui Fan, Karl Menten, Ran Wang

Research output: Contribution to journalArticle

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Abstract

We present Karl G. Jansky Very Large Array (VLA) observations of the CO (J = 2→1) line emission towards the z = 6.419 quasar SDSS J114816.64 + 525150.3 (J1148 + 5251). The molecular gas is found to be marginally resolved with amajor axis of 0.9 arcsec (consistent with previous size measurements of the CO (J = 7→6) emission). We observe tentative evidence for extended line emission towards the south-west on a scale of ~1.4 arcsec, but this is only detected at 3.3σ significance and should be confirmed. The position of the molecular emission region is in excellent agreement with previous detections of low-frequency radio continuum emission as well as [C II] line and thermal dust continuum emission. These CO (J = 2→1) observations provide an anchor for the low-excitation part of the molecular line spectral energy distribution. We find no evidence for extended low-excitation component, neither in the spectral line energy distribution nor the image. We fit a single kinetic gas temperature model of 50 K. We revisit the gas and dynamical masses in light of this new detection of a low-order transition of CO, and confirm previous findings that there is no extended reservoir of cold molecular gas in J1148 + 5251, and that the source departs substantially from the low-z relationship between black hole mass and bulge mass. Hence, the characteristics of J1148 + 5251 at z = 6.419 are very similar to z ~ 2 quasars, in the lack of a diffuse cold gas reservoir and kpc-size compactness of the star-forming region.

Original languageEnglish (US)
Pages (from-to)1713-1718
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume451
Issue number2
DOIs
StatePublished - May 1 2015

Fingerprint

cold gas
molecular gases
gas
quasars
continuums
Very Large Array (VLA)
void ratio
spectral energy distribution
gas temperature
anchor
excitation
line spectra
energy
cold
energy distribution
dust
radio
low frequencies
stars
kinetics

Keywords

  • Cosmology: observations
  • Galaxies: active
  • Galaxies: formation
  • Galaxies: high-redshift
  • Galaxies: individual: SDSS J114816.64 + 525150.3
  • Radio lines: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Stefan, I. I., Carilli, C. L., Wagg, J., Walter, F., Riechers, D. A., Bertoldi, F., ... Wang, R. (2015). Imaging the cold molecular gas in SDSS J1148 + 5251 at z = 6.4. Monthly Notices of the Royal Astronomical Society, 451(2), 1713-1718. https://doi.org/10.1093/mnras/stv1108

Imaging the cold molecular gas in SDSS J1148 + 5251 at z = 6.4. / Stefan, Irina I.; Carilli, Chris L.; Wagg, Jeff; Walter, Fabian; Riechers, Dominik A.; Bertoldi, Frank; Green, David A.; Fan, Xiaohui; Menten, Karl; Wang, Ran.

In: Monthly Notices of the Royal Astronomical Society, Vol. 451, No. 2, 01.05.2015, p. 1713-1718.

Research output: Contribution to journalArticle

Stefan, II, Carilli, CL, Wagg, J, Walter, F, Riechers, DA, Bertoldi, F, Green, DA, Fan, X, Menten, K & Wang, R 2015, 'Imaging the cold molecular gas in SDSS J1148 + 5251 at z = 6.4', Monthly Notices of the Royal Astronomical Society, vol. 451, no. 2, pp. 1713-1718. https://doi.org/10.1093/mnras/stv1108
Stefan II, Carilli CL, Wagg J, Walter F, Riechers DA, Bertoldi F et al. Imaging the cold molecular gas in SDSS J1148 + 5251 at z = 6.4. Monthly Notices of the Royal Astronomical Society. 2015 May 1;451(2):1713-1718. https://doi.org/10.1093/mnras/stv1108
Stefan, Irina I. ; Carilli, Chris L. ; Wagg, Jeff ; Walter, Fabian ; Riechers, Dominik A. ; Bertoldi, Frank ; Green, David A. ; Fan, Xiaohui ; Menten, Karl ; Wang, Ran. / Imaging the cold molecular gas in SDSS J1148 + 5251 at z = 6.4. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 451, No. 2. pp. 1713-1718.
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abstract = "We present Karl G. Jansky Very Large Array (VLA) observations of the CO (J = 2→1) line emission towards the z = 6.419 quasar SDSS J114816.64 + 525150.3 (J1148 + 5251). The molecular gas is found to be marginally resolved with amajor axis of 0.9 arcsec (consistent with previous size measurements of the CO (J = 7→6) emission). We observe tentative evidence for extended line emission towards the south-west on a scale of ~1.4 arcsec, but this is only detected at 3.3σ significance and should be confirmed. The position of the molecular emission region is in excellent agreement with previous detections of low-frequency radio continuum emission as well as [C II] line and thermal dust continuum emission. These CO (J = 2→1) observations provide an anchor for the low-excitation part of the molecular line spectral energy distribution. We find no evidence for extended low-excitation component, neither in the spectral line energy distribution nor the image. We fit a single kinetic gas temperature model of 50 K. We revisit the gas and dynamical masses in light of this new detection of a low-order transition of CO, and confirm previous findings that there is no extended reservoir of cold molecular gas in J1148 + 5251, and that the source departs substantially from the low-z relationship between black hole mass and bulge mass. Hence, the characteristics of J1148 + 5251 at z = 6.419 are very similar to z ~ 2 quasars, in the lack of a diffuse cold gas reservoir and kpc-size compactness of the star-forming region.",
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AU - Stefan, Irina I.

AU - Carilli, Chris L.

AU - Wagg, Jeff

AU - Walter, Fabian

AU - Riechers, Dominik A.

AU - Bertoldi, Frank

AU - Green, David A.

AU - Fan, Xiaohui

AU - Menten, Karl

AU - Wang, Ran

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N2 - We present Karl G. Jansky Very Large Array (VLA) observations of the CO (J = 2→1) line emission towards the z = 6.419 quasar SDSS J114816.64 + 525150.3 (J1148 + 5251). The molecular gas is found to be marginally resolved with amajor axis of 0.9 arcsec (consistent with previous size measurements of the CO (J = 7→6) emission). We observe tentative evidence for extended line emission towards the south-west on a scale of ~1.4 arcsec, but this is only detected at 3.3σ significance and should be confirmed. The position of the molecular emission region is in excellent agreement with previous detections of low-frequency radio continuum emission as well as [C II] line and thermal dust continuum emission. These CO (J = 2→1) observations provide an anchor for the low-excitation part of the molecular line spectral energy distribution. We find no evidence for extended low-excitation component, neither in the spectral line energy distribution nor the image. We fit a single kinetic gas temperature model of 50 K. We revisit the gas and dynamical masses in light of this new detection of a low-order transition of CO, and confirm previous findings that there is no extended reservoir of cold molecular gas in J1148 + 5251, and that the source departs substantially from the low-z relationship between black hole mass and bulge mass. Hence, the characteristics of J1148 + 5251 at z = 6.419 are very similar to z ~ 2 quasars, in the lack of a diffuse cold gas reservoir and kpc-size compactness of the star-forming region.

AB - We present Karl G. Jansky Very Large Array (VLA) observations of the CO (J = 2→1) line emission towards the z = 6.419 quasar SDSS J114816.64 + 525150.3 (J1148 + 5251). The molecular gas is found to be marginally resolved with amajor axis of 0.9 arcsec (consistent with previous size measurements of the CO (J = 7→6) emission). We observe tentative evidence for extended line emission towards the south-west on a scale of ~1.4 arcsec, but this is only detected at 3.3σ significance and should be confirmed. The position of the molecular emission region is in excellent agreement with previous detections of low-frequency radio continuum emission as well as [C II] line and thermal dust continuum emission. These CO (J = 2→1) observations provide an anchor for the low-excitation part of the molecular line spectral energy distribution. We find no evidence for extended low-excitation component, neither in the spectral line energy distribution nor the image. We fit a single kinetic gas temperature model of 50 K. We revisit the gas and dynamical masses in light of this new detection of a low-order transition of CO, and confirm previous findings that there is no extended reservoir of cold molecular gas in J1148 + 5251, and that the source departs substantially from the low-z relationship between black hole mass and bulge mass. Hence, the characteristics of J1148 + 5251 at z = 6.419 are very similar to z ~ 2 quasars, in the lack of a diffuse cold gas reservoir and kpc-size compactness of the star-forming region.

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KW - Galaxies: active

KW - Galaxies: formation

KW - Galaxies: high-redshift

KW - Galaxies: individual: SDSS J114816.64 + 525150.3

KW - Radio lines: galaxies

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