J/A+A/680/A95 APM08279+5255 and NCv1.143 spectra (Yang+, 2023)
SUNRISE: The rich molecular inventory of high-redshift dusty galaxies revealed
by broadband spectral line surveys.
Yang C., Omont A., Martin S., Bisbas T.G., Cox P., Beelen A.,
Gonzalez-Alfonso E., Gavazzi R., Aalto S., Andreani P., Ceccarelli C.,
Gao Y., Gorski M., Guelin M., Fu H., Ivison R.J., Knudsen K.K., Lehnert M.,
Messias H., Muller S., Neri R., Riechers D., van der Werf P., Zhang Z.-Y.
<Astron. Astrophys. 680, A95 (2023)>
=2023A&A...680A..95Y 2023A&A...680A..95Y (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra; Interstellar medium; Millimetric/submm sources
Keywords: galaxies: high-redshift - galaxies: ISM - infrared: galaxies -
submillimeter: galaxies - radio lines: ISM - ISM: molecules
Abstract:
Understanding the nature of high-redshift dusty galaxies requires a
comprehensive view of their interstellar medium (ISM) and molecular
complexity. However, the molecular ISM at high redshifts is commonly
studied using only a few species beyond 12C16O, limiting our
understanding. In this paper, we present the results of deep 3mm
spectral line surveys using the NOrthern Extended Millimeter Array
(NOEMA) targeting two strongly lensed dusty galaxies observed when the
Universe was less than 1.8Gyr old: APM 08279+5255, a quasar at
redshift z=3.911, and NCv1.143 (H-ATLAS J125632.7+233625), a z=3.565
starburst galaxy. The spectral line surveys cover rest-frame
frequencies from about 330 to 550GHz for both galaxies. We report the
detection of 38 and 25 emission lines in APM 08279+5255 and NCv1.143,
respectively. These lines originate from 17 species, namely CO,
13CO, C18O, CN, CCH, HCN, HCO+, HNC, CS, C34S, H2O, H3O+,
NO, N2H+, CH, c-C3H2, as well as the vibrationally excited HCN
and neutral carbon. The spectra reveal the chemical richness and the
complexity of the physical properties of the ISM. By comparing the
spectra of the two sources and combining the analysis of the molecular
gas excitation, we find that the physical properties and the chemical
imprints of the ISM are different between them: the molecular gas is
more excited in APM 08279+5255, exhibiting higher molecular gas
temperatures and densities compared to NCv1.143; the molecular
abundances in APM 08279+5255 are akin to the values of local active
galactic nuclei (AGN), showing boosted relative abundances of the
dense gas tracers that might be related to high-temperature chemistry
and/or the X-ray-dominated regions, while NCv1.143 more closely
resembles local starburst galaxies. The most significant differences
between the two sources are found in H2O, where the 448GHz
ortho-H2O(423-330) line is significantly brighter in APM 08279+5255,
likely linked to the intense far-infrared radiation from the dust
powered by AGN. Our astrochemical model suggests that, at such high
column densities, FUV radiation is less important in regulating the
ISM, while cosmic rays (and/or X-rays and shocks) are the key players
in shaping the molecular abundances and the initial conditions of star
formation. Both our observed CO isotopologues line ratios and the
derived extreme ISM conditions (high gas temperature and density, high
cosmic-ray ionization rate) suggest the presence of a top-heavy
initial mass function. From the ∼330-550GHz continuum, we also find
evidence of non-thermal millimeter flux excess in APM 08279+5255 that
might be related to the central supermassive black hole. Such deep
spectral line surveys open a new window to study the physics and
chemistry of the ISM and the radiation field of galaxies in the early
Universe.
Description:
The deep 3 mm spectral line surveys of APM 08279+5255 and NCv1.143
were conducted using NOEMA with its PolyFix correlator.
The observations spanned two semesters from June 2018 to March 2019.
The FITS file of the 1D spectra of the SUNRISE line survey of
APM 08279+5255 and NCv1.143.
Objects:
------------------------------------------------------------------
RA (2000) DE Designation(s)
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08 31 41.71 +52 45 17.6 APM 08279+5255 = 3XMM J083141.7+524517
12 56 32.54 +23 36 27.6 NCv1.143 = H-ATLAS J125632.4+233627
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 80 2 List of fits spectra
fits/* . 2 Individual fits spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (J2000)
4- 5 I2 min RAm Right Ascension (J2000)
7- 11 F5.2 s RAs Right Ascension (J2000)
12 A1 --- DE- Declination sign (J2000)
13- 14 I2 deg DEd Declination (J2000)
16- 17 I2 arcmin DEm Declination (J2000)
19- 22 F4.1 arcsec DEs Declination (J2000)
24- 25 I2 --- Nx Number of pixels along X-axis
27- 31 I5 --- Ny Number of pixels along Y-axis
33- 35 I3 Kibyte size Size of FITS file
37- 54 A18 --- FileName Name of FITS file, in subdirectory fits
56- 80 A25 --- Title Title of the FITS file
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Acknowledgements:
Chentao Yang, chentao.yang(at)chalmers.se
(End) Patricia Vannier [CDS] 23-Oct-2023