J/A+A/682/A180 IRDC G14.225-0.506 stellar population (Diaz-Marquez+, 2024)
Radio survey of the stellar population in the infrared dark cloud G14.225-0.506.
Diaz-Marquez E., Grau R., Busquet G., Girart J.M., Sanchez-Monge A.,
Palau A., Povich M.S., Anez-Lopez N., Liu H.B., Zhang Q., Estalella R.
<Astron. Astrophys. 682, A180 (2024)>
=2024A&A...682A.180D 2024A&A...682A.180D (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Infrared sources ; Radio sources
Keywords: stars: formation - ISM: jets and outflows - radio continuum: ISM -
ISM: individual objects: G14.225-0.506
Abstract:
The IRDC G14.225-0.506 is associated with a network of filaments,
which result in two different dense hubs, as well as with several
signposts of star formation activity. The aim of this work is to study
the cm continuum emission to characterize the stellar population in
G14.2. We performed deep (∼1.5-3uJy) radio continuum observations
at 6 and 3.6cm using the VLA in the A configuration (∼0.3''). We have
also made use of observations taken during different days to study the
presence of variability at short timescales. We detected a total of 66
sources, 32 in the northern region G14.2-N and 34 in the southern
region G14.2-S. Ten of the sources are found to be variable. Based on
their spectral index, the emission in G14.2-N is mainly dominated by
non-thermal sources while G14.2-S contains more thermal emitters.
Approximately 75% of the sources present a counterpart at other
wavelengths. In the inner 0.4pc region around the center of each hub,
the number of IR sources in G14.2-N is larger than in G14.2-S by a
factor of 4. We also studied the relation between the radio luminosity
and the bolometric luminosity, finding that the thermal emission of
the studied sources is compatible with thermal radio jets. For our
sources with X-ray counterparts, the non-thermal emitters follow a
Guedel-Benz relation with k=0.03. We found similar levels of
fragmentation between G14.2-N and G14.2-S, suggesting that both
regions are most likely twin hubs. The non-thermal emission found in
the less evolved objects suggests that G14.2-N may be composed of more
massive YSOs as well as being in a more advanced evolutionary stage,
consistent with the filament-halo gradient in age and mass from
previous works. Our results confirm a wider evolutionary sequence
starting in G14.2-S as the youngest part, followed by G14.2-N, and
ending with the most evolved region M17.
Description:
Full tables C.1 and C.2 of Appendix C showing the positions and
parameters of the radio sources detected at C- and X-band in the
IRDC G14.225-0.506.
Objects:
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RA (2000) DE Designation(s)
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18 19 00.00 -16 40 00.0 G14.225-0.506 = GAL 014.225-00.506
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 78 32 Spectral indices of the radio sources located
in G14.2-N
table7.dat 78 35 Spectral indices of the radio sources located
in G14.2-S
tablec1.dat 148 53 Parameters of the radio sources detected at C-band
tablec2.dat 148 36 Parameters of the radio sources detected at X-band
list.dat 124 4 List of fits images
fits/* . 4 Individual fits images
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Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Source Name of the detected source (VLA-NN)
8- 21 F14.9 uJy SC Integrated flux detected at C-band
23- 35 F13.9 uJy e_SC ? Error in the integrated flux detected
at C-band
37- 49 F13.8 uJy SX Integrated flux detected at X-band
51- 63 F13.9 uJy e_SX ? Error in the integrated flux detected
at X-band
65- 69 F5.2 --- SpId Spectral index
71- 74 F4.2 --- e_SpId ? Error in the spectral index
76 A1 --- upp [Y/N] Upper limit?
78 A1 --- low [Y/N] Lower limit?
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Byte-by-byte Description of file: tablec1.dat tablec2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Source Name of the detected source (VLA-NN)
8 A1 --- HUB [N/S] Region where the source is located
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 23 F8.5 s RAs Right ascension (J2000)
25- 31 F7.5 s e_RAs Error in the right ascension
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 47 F8.5 arcsec DEs Declination (J2000)
49- 55 F7.5 arcsec e_DEs Error in the declination
57- 70 F14.9 uJy Scorr Integrated flux corrected for the
primary beam attenuation
72- 84 F13.9 uJy e_Scorr Error in the integrated flux
86-100 F15.10 uJy/beam Ipeakcorr Peak intensity corrected for the
primary beam attenuation
102-121 F20.16 uJy/beam e_Ipeakcorr Error in the peak intensity
123-135 F13.8 mas Size ?=0 Size of the source
137-142 F6.2 deg PA ? Position angle
144-148 F5.2 deg e_PA ? Error in the position angle
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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- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 56 A27 "datime" Obs.date Observation date
57- 67 E11.6 Hz Freq Observed frequency
69- 74 I6 Kibyte size Size of FITS file
76- 95 A20 --- FileName Name of FITS file, in subdirectory fits
97-124 A28 --- Title Title of the FITS file
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Acknowledgements:
Elena Diaz-Marquez, ediazm(at)fqa.ub.edu
(End) Patricia Vannier [CDS] 04-Dec-2023