2013A&A...559A..91L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:14:41

2013A&A...559A..91L - Astronomy and Astrophysics, volume 559A, 91-91 (2013/11-1)

Limits on the spatial variations of the electron-to-proton mass ratio in the Galactic plane.

LEVSHAKOV S.A., REIMERS D., HENKEL C., WINKEL B., MIGNANO A., CENTURION M. and MOLARO P.

Abstract (from CDS):

We aim to validate the Einstein equivalence principle (local position invariance) by limiting the fractional changes in the electron-to-proton mass ratio, µ=me/mp, measured in Galactic plane objects. High-resolution spectral observations of dark clouds in the inversion line of NH3(1, 1) and pure rotational lines of other molecules (the so-called ammonia method) were performed at the Medicina 32-m and the Effelsberg 100-m radio telescopes to measure the radial velocity offsets, ΔRV=Vrot-Vinv, between the rotational and inversion transitions, which have different sensitivities to the value of µ. In our previous observations (2008-2010), a mean offset of <ΔRV≥0.027±0.010km/s (3σ confidence level (C.L.)) was measured. To test for possible hidden errors, we carried out additional observations of a sample of molecular cores in 2010-2013. As a result, a systematic error with an amplitude ∼0.02km/s in the radial velocities was revealed. The averaged offset between the radial velocities of the rotational transitions of HC3N(2-1), HC5N(9-8), HC7N(16-15), HC7N(21-20), and HC7N(23-22), and the inversion transition of NH3(1, 1) is <ΔRV≥0.003±0.018km/s (3σ C.L.). This value, when interpreted in terms of Δµ/µ=(µobslab)/µlab, constraints the µ-variation at the level of Δµ/µ<2x10–8 (3σ C.L.), which is the most stringent limit on the fractional changes in µ based on astronomical observations.

Abstract Copyright:

Journal keyword(s): line: profiles - ISM: molecules - radio lines: ISM - techniques: radial velocities - elementary particles

CDS comments: In ref list Kuiper et al 1996 is Kuiper et al. 1996ApJ...468..761K

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME [BM89] L1498 PoC 04 10 51.4 +25 09 58           ~ 187 0
2 LDN 1498 DNe 04 11.0 +24 58           ~ 247 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1359 0
4 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 160 0
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11542 0
6 [DB2002b] G7.56+4.20 MoC 17 47 03 -20 17.8           ~ 4 0
7 HBC 668 Em* 18 29 01.2258619468 +00 29 33.113212934   16.8       M0.5: 24 0
8 HBC 671 Em* 18 29 01.8367751476 +00 29 54.753564712   18.4       K0: 25 0
9 TGU H279 P6 DNe 18 29.1 +00 35           ~ 4 0
10 TGU H279 P12 DNe 18 29.8 +01 17           ~ 4 0
11 [LHR2013] Serpens South 3 cor 18 29 57.0 -02 00 10           ~ 4 1
12 TGU H279 P8 DNe 18 30.4 -02 48           ~ 3 0
13 LDN 663 DNe 19 36 55 +07 34.4           ~ 555 0
14 [LHR2013] Ka5 cor 19 37 01.0 +07 34 30           ~ 2 0
15 LDN 1251C DNe 22 35 40.0 +75 18 06           ~ 22 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:14:41

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