2014MNRAS.441.2546P

Query : 2014MNRAS.441.2546P

2014MNRAS.441.2546P - Mon. Not. R. Astron. Soc., 441, 2546-2554 (2014/July-1)

Non-equilibrium populations of hydrogen in high-redshift galaxies.

POMERANTZ B.B., REDMOND K. and STRELNITSKI V.

Abstract (from CDS):

We investigate the possibility of maser amplification in hydrogen recombination lines from the galaxies of first generation, at z\lesssim 30. Combining analytical and computational approaches, we show that the transitions between the hydrogen Rydberg energy levels induced by the radiation from the ionizing star and by the (warmer than currently) cosmic microwave background can produce noticeable differences in the population distribution, as compared with previous computations for contemporary H+ regions, most of which ignored the processes induced by the ionizing star's radiation. In particular, the low (n\lesssim 30) α-transitions show an increased tendency towards population inversion, when ionization of the H+ region is caused by a very hot star at high redshift. The resulting maser/laser amplification can increase the brightness of the emitted lines and make them detectable. However, the limiting effects of maser saturation will probably not allow maser gains to exceed one or two orders of magnitude.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): masers - H ii regions - galaxies: high-redshift - galaxies: ISM - radio lines: galaxies

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 837 0

Query : 2014MNRAS.441.2546P

Basic data :
EM* MWC 349 -- Double or Multiple Star
Other object types: otypes_help 		* (2022AJ,GSC,...), Em* (EM*,HBHA,...), V* (CSV,V*,...), mm (BGPS,BGPSv2,...), Rad (GPSR,NVSS,...), ** (**,WDS), smm (JCMTSE,JCMTSF), MIR (WISEA,WISE), IR (IRAS,RAFGL), Er* (2012A&A), NIR (2MASS)
ICRS coord. (ep=J2000) : 		20 32 45.499080 +40 39 36.74124 (Optical) [ 45 21 90 ] B 2012yCat.1322....0Z
FK4 coord. (ep=B1950 eq=1950) : 		20 30 56.692645 +40 29 21.01901 [ 45 21 90 ]
Gal coord. (ep=J2000) : 		079.642949327 +00.473379079 [ 45 21 90 ]
Proper motions mas/yr : 		30.2 -14.4 [5.2 2.5 90] C 2012yCat.1322....0Z
Radial velocity / Redshift / cz : 		V(km/s) -506.838989 [0.375971] / z(spectroscopic) -0.001689 [0.000001] / cz -506.41 [0.38]
   (NIR) A 2020AJ....160..120J
Spectral type: 		Bep E 1932ApJ....76..156M
Fluxes (9) :
B 15.88 [0.05] D 2012yCat.1322....0Z
V 13.15 [0.04] D 2012yCat.1322....0Z
R 12.13 [0.09] E 2012yCat.1322....0Z
J 6.225 [0.019] C 2003yCat.2246....0C
H 4.753 [0.033] C 2003yCat.2246....0C
K 3.150 [0.368] D 2003yCat.2246....0C
g 14.58 [0.02] D 2012yCat.1322....0Z
r 11.39 [0.12] D 2012yCat.1322....0Z
i 10.40 [0.12] D 2012yCat.1322....0Z
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 2 		Display criteria :

Identifiers (29) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

GSC 03157-00961 HBHA 4203-02 19P 20 WISEA J203245.53+403936.5
** SKF 1866 Hen 3-1910 RAFGL 2603 WISE J203245.46+403935.2
AP J20324553+4039366 IRAS 20310+4029 TIC 17130641 [KW97] 47-41
BGPS G079.643+00.473 JCMTSE J203245.5+403934 UCAC2 46032128 [SSS2011] BGPS G79.643+0.476
BGPSv2 G079.643+00.474 JCMTSF J203245.5+403934 UCAC3 262-206547 AAVSO 2029+40
CSV 5206 JP11 5215 UCAC4 654-091604
EM* MWC 349 2MASS J20324553+4039366 V* V1478 Cyg
GPSR 079.643+0.473 NVSS J203245+403938 WDS J20328+4040AB

References (837 between 1850 and 2026) (Total 837)
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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Collections of Measurements Description of Measurements

Velocities : 1    Rot : 1    Fe/H : 1   

   

Observing logs
Herschel : 13    ISO : 21    IUE : 1   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : EM* MWC 349

Link by name to the catalogue in VizieR :

GSC 03157-00961 AP J20324553+4039366 IRAS 20310+4029 2MASS J20324553+4039366 NVSS J203245+403938
RAFGL 2603 UCAC2 46032128 UCAC3 262-206547 UCAC4 654-091604 V* V1478 Cyg
WDS J20328+4040AB WISEA J203245.53+403936.5 WISE J203245.46+403935.2

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