2018ApJS..235...30K


Query : 2018ApJS..235...30K

2018ApJS..235...30K - Astrophys. J., Suppl. Ser., 235, 30-30 (2018/April-0)

The Herschel-PACS legacy of low-mass protostars: the properties of warm and hot gas components and their origin in far-UV illuminated Shocks.

KARSKA A., KAUFMAN M.J., KRISTENSEN L.E., VAN DISHOECK E.F., HERCZEG G.J., MOTTRAM J.C., TYCHONIEC L., LINDBERG J.E., EVANS II N.J., GREEN J.D., YANG Y.-L., GUSDORF A., ITRICH D. and SIODMIAK N.

Abstract (from CDS):

Recent observations from Herschel allow the identification of important mechanisms responsible both for the heating of the gas that surrounds low-mass protostars and for its subsequent cooling in the far-infrared. Shocks are routinely invoked to reproduce some properties of the far-IR spectra, but standard models fail to reproduce the emission from key molecules, e.g., H2O. Here, we present the Herschel Photodetector Array Camera and Spectrometer (PACS) far-IR spectroscopy of 90 embedded low-mass protostars (Class 0/I). The Herschel-PACS spectral maps, covering ∼55-210 µm with a field of view of ∼50'', are used to quantify the gas excitation conditions and spatial extent using rotational transitions of H2O, high-J CO, and OH, as well as [O I] and [C II]. We confirm that a warm (∼300 K) CO reservoir is ubiquitous and that a hotter component (760 ± 170 K) is frequently detected around protostars. The line emission is extended beyond ∼1000 au spatial scales in 40/90 objects, typically in molecular tracers in Class 0 and atomic tracers in Class I objects. High-velocity emission (>=90 km s–1) is detected in only 10 sources in the [O I] line, suggesting that the bulk of [O I] arises from gas that is moving slower than typical jets. Line flux ratios show an excellent agreement with models of C-shocks illuminated by ultraviolet (UV) photons for pre-shock densities of ∼105 cm–3 and UV fields 0.1-10 times the interstellar value. The far-IR molecular and atomic lines are a unique diagnostic of feedback from UV emission and shocks in envelopes of deeply embedded protostars.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): infrared: ISM - ISM: jets and outflows - ISM: molecules

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IRAS F03226+3033 Y*O 03 25 38.83 +30 44 06.2           ~ 319 0
2 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 421 3
3 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 641 1
4 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1282 1
5 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 574 0
6 JCMTSE J033317.8+310932 cor 03 33 17.85 +31 09 31.9           ~ 84 0
7 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1155 0
8 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 823 0
9 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3772 0
10 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 301 1
11 BHR 71 MoC 12 01 36.810 -65 08 49.22           ~ 128 0
12 V* DK Cha Or* 12 53 17.2028372976 -77 07 10.727661977           F0 132 0
13 GSS 30 Y*O 16 26 21.38160 -24 23 04.0524           ~ 204 1
14 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 273 1
15 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3219 1
16 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 984 2
17 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 246 2
18 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 137 2
19 NAME SERPENS SMM 3 smm 18 29 59.7 +01 14 00           ~ 87 1
20 NAME Serpens South molecular cloud MoC 18 30 -02.0           ~ 67 0
21 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 204 2
22 [MAM2011] W40-MM26 Y*O 18 31 46.54 -02 04 22.5           ~ 4 0
23 [MAM2011] W40-MM27 Y*O 18 31 46.78 -02 02 19.9           ~ 4 0
24 NAME Aql Rift DNe 18 32 -01.0           ~ 272 1
25 2MASS J19014846-3657148 Y*O 19 01 48.461 -36 57 14.88           ~ 18 0
26 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 417 0
27 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 516 0
28 LDN 1014 cor 21 24 05.9 +49 59 07           ~ 92 0
29 NAME Aql Region reg ~ ~           ~ 336 0

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2021.09.27-18:40:03

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