J/A+A/547/A49 Herschel EPoS: high-mass overview (Ragan+, 2012)
The Earliest Phases of Star Formation (EPoS) - A Herschel key program:
The precursors to high-mass stars and clusters.
Ragan S., Henning T., Krause O., Pitann J., Beuther H., Linz H.,
Tackenberg J., Balog Z., Hennemnan M., Launhardt R., Lippok N.,
Schmiedeke A., Schuller F., Steinacker J., Stutz A., Vasyunina T.
<Astron. Astrophys. 547, A49 (2012)>
=2012A&A...547A..49R 2012A&A...547A..49R
ADC_Keywords: Protostars ; Infrared sources ; Photometry, infrared ; YSOs
Keywords: ISM: clouds - stars: formation, massive
Abstract:
Stars are born deeply embedded in molecular clouds. In the earliest
embedded phases, protostars emit the bulk of their radiation in the
far-infrared wavelength range, where Herschel is perfectly suited to
probe at high angular resolution and dynamic range. In the high-mass
regime, the birthplaces of protostars are thought to be in the
high-density structures known as infrared-dark clouds (IRDCs). While
massive IRDCs are believed to have the right conditions to give rise
to massive stars and clusters, the evolutionary sequence of this
process is not well-characterized.
As part of the Earliest Phases of Star formation (EPoS) Herschel
guaranteed time key program, we isolate the embedded structures within
IRDCs and other cold, massive molecular clouds. We present the full
sample of 45 high-mass regions which were mapped at PACS 70, 100, and
160um and SPIRE 250, 350, and 500um. In the present paper, we
characterize a population of cores which appear in the PACS bands and
place them into context with their host molecular cloud and
investigate their evolutionary stage.
Description:
The core catalog giving the photometric parameters for 496 cores
appearing as point sources in the Herschel PACS 70, 100, and 160
micron bands, with best-fit core mass, temperatures, and luminosities.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 67 45 IRDC (infrared-dark clouds) sample
tablec.dat 108 496 Core catalog
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See also:
J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)
J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)
J/ApJ/680/349 : Galactic distribution of IRDCs (Jackson+, 2008)
J/ApJ/686/384 : 12CO, 13CO, C18O survey of IRDCs (Du+, 2008)
J/MNRAS/399/1506 : IRDC cores in SCUBA Legacy Catalogue (Parsons+, 2009)
J/ApJ/698/324 : Spitzer IRDCs (Ragan+, 2009)
J/ApJ/715/310 : Early stages of star formation in IRDCs (Rathborne+, 2010)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Full IRDC name
18- 25 F8.4 deg RAdeg Right ascension (J2000) of map center
27- 34 F8.4 deg DEdeg Declination (J2000) of map center
36- 40 F5.1 km/s Vlsr LSR Velocity
42- 45 F4.2 kpc Dist Kinematic distance
47- 50 F4.2 kpc E_Dist Positive uncertainty in distance
52- 55 F4.2 kpc e_Dist Negative uncertainty in distance
57- 61 I5 Msun Mcld ?=-9999 Mass of entire cloud (1)
63- 67 A5 --- r_Mcld Source of large scale map (2)
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Note (1): Masses are computed with ATLASGAL 870µm, SCUBA 850µm
or MAMBO 1.2mm data (see r_Mcld). In cases where no such maps were
available, the entry is -9999.
Note (2): Source of large scale map as follows:
SCUBA = mass computed with SCUBA 850um data
MAMBO = mass computed with MAMBO 1.2mm data
ATGAL = mass computed with ATLASGAL 870um data
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Byte-by-byte Description of file: tablec.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name IRDC name
18- 19 I2 --- Core Core ID number
21- 28 F8.4 deg RAdeg Right ascension (J2000)
30- 38 F9.5 deg DEdeg Declination (J2000)
40- 46 F7.3 Jy S24 ?=-99.999 Flux density at 24µm (1)
48- 54 F7.2 Jy S70 Flux density at 70µm
56- 62 F7.2 Jy S100 Flux density at 100µm
64- 71 F8.2 Jy S160 Flux density at 160µm
73- 74 I2 K Tcore Core temperature in Kelvin
76- 82 F7.1 Lsun Lcore Core luminosity in solar luminosities
84- 90 F7.2 Msun Mcore Core mass in solar masses
92-108 A17 --- catID Catalog ID (IRAS or MSX) (2)
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Note (1): Data were not available at 24µm for all cores, and some positions
were saturated in the Spitzer MIPS detector. In normal cases, the flux
density in Janskys is given (0.0 for instances of no counterpart in
available data). Otherwise:
999.999 = saturated source in Spitzer MIPS 24µm image
-99.999 = no data available
Note (2): Names of IRAS source or MSX source (Glll.lll+bb.bbbb) that best
matches the core position, RAdeg, DEdeg.
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Acknowledgements:
Sarah Ragan, ragan(at)mpia.de
(End) Sarah Ragan [MPIA], Patricia Vannier [CDS] 30-Oct-2012