2010A&A...521L..44B -
Astronomy and Astrophysics, volume 521, L44-44 (2010/10-1)
Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption.
BRUDERER S., BENZ A.O., VAN DISHOECK E.F., MELCHIOR M., DOTY S.D., VAN DER TAK F., STAEUBER P., WAMPFLER S.F., DEDES C., YILDIZ U.A., PAGANI L., GIANNINI T., DE GRAAUW T., WHYBORN N., TEYSSIER D., JELLEMA W., SHIPMAN R., SCHIEDER R., HONINGH N., CAUX E., BAECHTOLD W., CSILLAGHY A., MONSTEIN C., BACHILLER R., BAUDRY A., BENEDETTINI M., BERGIN E., BJERKELI P., BLAKE G.A., BONTEMPS S., BRAINE J., CASELLI P., CERNICHARO J., CODELLA C., DANIEL F., DI GIORGIO A.M., DOMINIK C., ENCRENAZ P., FICH M., FUENTE A., GOICOECHEA J.R., HELMICH F., HERCZEG G.J., HERPIN F., HOGERHEIJDE M.R., JACQ T., JOHNSTONE D., JORGENSEN J.K., KRISTENSEN L.E., LARSSON B., LIS D., LISEAU R., MARSEILLE M., McCOEY C., MELNICK G., NEUFELD D., NISINI B., OLBERG M., PARISE B., PEARSON J.C., PLUME R., RISACHER C., SANTIAGO-GARCIA J., SARACENO P., SHIPMAN R., TAFALLA M., VAN KEMPEN T.A., VISSER R. and WYROWSKI F.
Abstract (from CDS):
The Heterodyne Instrument for the Far Infrared (HIFI) onboard the Herschel Space Observatory allows the first observations of light diatomic molecules at high spectral resolution and in multiple transitions. Here, we report deep integrations using HIFI in different lines of hydrides towards the high-mass star forming region AFGL 2591. Detected are CH, CH+, NH, OH+, H2O+, while NH+ and SH+ have not been detected. All molecules except for CH and CH+ are seen in absorption with low excitation temperatures and at velocities different from the systemic velocity of the protostellar envelope. Surprisingly, the CH(JF,P=3/22,–-1/21,+) and CH+(J=1-0, J=2-1) lines are detected in emission at the systemic velocity. We can assign the absorption features to a foreground cloud and an outflow lobe, while the CH and CH+ emission stems from the envelope. The observed abundance and excitation of CH and CH+ can be explained in the scenario of FUV irradiated outflow walls, where a cavity etched out by the outflow allows protostellar FUV photons to irradiate and heat the envelope at larger distances driving the chemical reactions that produce these molecules.
(Ref) Object type as listed in the reference "Ref"
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Other object types:
Rad
(),
smm
(BLAST,JCMTSE,...),
IR
(IRAS,RAFGL,...),
Mas
(2011MNRAS,[RMB2014]),
mm
(BGPS,[OHJ2020],...),
MIR
(AKARI,MSX6C,...),
Y*O
(2014MNRAS),
out
(2015MNRAS),
HII
(2011MNRAS),
MoC
([HLB98]),
NIR
(2MASS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
bibcode : bibcode of the coordinates reference
FK4
coord.
(ep=B1950 eq=1950) :
20 27 35.9111 +40 01 14.980
[
]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
bibcode : bibcode of the coordinates reference
Gal
coord.
(ep=J2000) :
078.8866548 +00.7089337
[
]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
[error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
quality : flag of quality (A=best quality -> E=worst quality, { � } =unknown quality)
References (613 between 1850 and 2023) (Total 613)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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