J/A+A/628/A67 15273Å near-infrared DIB (Elyajouri+, 2019)
Updated extraction of the APOGEE 1.5273 µm diffuse interstellar band:
a Planck view on the carrier depletion in dense cores.
Elyajouri M., Lallement R.
<Astron. Astrophys. 628, A67 (2019)>
=2019A&A...628A..67E 2019A&A...628A..67E (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Equivalent widths
Keywords: ISM: clouds - ISM: lines and bands - dust, extinction -
infrared: ISM - ISM: molecules
Abstract:
The latest SDSS/APOGEE data release DR14 has provided an increased
number of stellar spectra in the H band and associated stellar models
using an innovative algorithm known as The Cannon. We took advantage
of these novelties to extract the 15273Å near-infrared DIB and to
study its link with dust extinction and emission. We modified our
automated fitting methods dedicated for hot stars and used in earlier
studies with some adaptations motivated by the change from early- or
intermediate-type stars to red giants. A new method has also been
developed to quantify the upper limits on DIB strengths. Careful and
thorough examinations of the DIB parameters, the continuum shape and
the quality of the adjustment of the model to the data were done. We
compared our DIB measurements with the stellar extinctions Av from the
Starhorse database. We then compared the resulting DIB-extinction
ratio with the dust optical depth derived from Planck data, globally
and also separately for nearby off-Plane cloud complexes. Our analysis
has led to the production of a catalog containing 124 064 new
measurements of the 15273Å DIB, allowing us to revisit the
correlation between DIB strength and dust reddening.
Description:
The latest APOGEE Data Release 14 (DR14; Abolfathi et al.,
2018ApJS..235...42A 2018ApJS..235...42A) includes results from APOGEE-1 (September
2011-July 2014) in addition to two years of SDSS-IV APOGEE-2 data
(July 2014-July 2016). DR14 APOGEE products contain data from
approximately 263000 stars, all identified by 2MASS catalog name. We
used the APOGEE DR 14 normalized spectra and their associated best fit
Cannon models to extract the 15273Å DIB strengths and their
associated uncertainties. We made use of the stellar extinctions in
the visible range Av calculated with the Bayesian Starhorse method
developed by Santiago et al. (2016A&A...585A..42S 2016A&A...585A..42S) and Queiroz et al.
(2018MNRAS.476.2556Q 2018MNRAS.476.2556Q). To trace Galactic dust properties in regions
with DIB measurements and allow better comparisons with the
interstellar dust along the sightlines, we made use of the Planck
Legacy archival data. Here we used the Planck 2015 results described
in Planck Collaboration et al. (2016A&A...586A.132P 2016A&A...586A.132P).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 103 124064 Measured DIB strengths and adopted AV and
dust optical depth
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See also:
J/ApJS/225/19 : DIBs from SDSS-III APOGEE spectra (Elyajouri+, 2016)
J/A+A/600/A129 : DIBs in APOGEE telluric std star spectra (Elyajouri+, 2017)
J/A+A/606/A76 : The ESO DIBs Large Exploration Survey (Cox+, 2017)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- 2MASS 2MASS name (HHMMSS.ss+DDMMSS.s)
18- 30 E13.9 deg GLAT Galactic latitude
32- 44 F13.9 deg GLON Galactic longitude
46- 57 E12.9 mag AVmean Extinction AV
59- 69 E11.9 mag e_AVmean Error on the extinction
71- 80 F10.8 0.1nm EW Measured DIB strength
82- 91 F10.8 0.1nm e_EW Error on the measured DIB strength
93-103 E11.6 --- tauPlanck Planck 353GHz dust optical depth
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Acknowledgements:
Meriem El-Yajouri, Meriem.El-Yajouri(at)obspm.fr
(End) Patricia Vannier [CDS] 24-Jul-2019