2021A&A...648A.116C


Query : 2021A&A...648A.116C

2021A&A...648A.116C - Astronomy and Astrophysics, volume 648A, 116-116 (2021/4-1)

PKS 1830-211: OH and H I at z = 0.89 and the first MeerKAT UHF spectrum.

COMBES F., GUPTA N., MULLER S., BALASHEV S., JOZSA G.I.G., SRIANAND R., MOMJIAN E., NOTERDAEME P., KLOCKNER H.-R., BAKER A.J., BOETTCHER E., BOSMA A., CHEN H.-W., DUTTA R., JAGANNATHAN P., JOSE J., KNOWLES K., KROGAGER J-.K., KULKARNI V.P., MOODLEY K., PANDEY S., PETITJEAN P. and SEKHAR S.

Abstract (from CDS):

The Large Survey Project (LSP) "MeerKAT Absorption Line Survey" (MALS) is a blind HI 21cm and OH 18cm absorption line survey in the L- and UHF-bands, primarily designed to better determine the occurrence of atomic and molecular gas in the circumgalactic and intergalactic medium, and its redshift evolution. Here we present the first results using the UHF band obtained towards the strongly lensed radio source PKS 1830-211, revealing the detection of absorption produced by the lensing galaxy. With merely 90 min of data acquired on-source for science verification and processed using the Automated Radio TelescopeImaging Pipeline (ARTIP), we detect in absorption the known HI 21cm and OH 18cm main lines at z=0.89 at an unprecedented signal-to-noise ratio (4000 in the continuum, in each 6km/s wide channel). For the first time we report the detection of OH satellite lines at z=0.89, which until now have not been detected at z>0.25. We decompose the OH lines into a thermal and a stimulated contribution, where the 1612 and 1720MHz lines are conjugate. The total OH 1720MHz emission line luminosity is 6100 L. This is the most luminous known 1720MHz maser line and is also among the most luminous of the OH main line megamasers. The absorption components of the different images of the background source sample different light paths in the lensing galaxy, and their weights in the total absorption spectrum are expected to vary in time on daily and monthly time scales. We compare our normalized spectra with those obtained more than 20 years ago, and find no variation. We interpret the absorption spectra with the help of a lens galaxy model derived from an N-body hydrodynamical simulation, with a morphology similar to its optical HST image. The resulting absorption lines depend mainly on the background continuum and the radial distribution of the gas surface density for each atomic and molecular species. We show that it is possible to reproduce the observations assuming a realistic spiral galaxy disk without invoking any central gas outflows. However, there are distinct and faint high-velocity features in the ALMA millimeter absorption spectra that most likely originate from high-velocity clouds or tidal features. These clouds may contribute to broaden the HI and OH spectra.

Abstract Copyright: © F. Combes et al. 2021

Journal keyword(s): galaxies: ISM - quasars: absorption lines - quasars: individual: PKS 1830-211

VizieR on-line data: <Available at CDS (J/A+A/648/A116): list.dat sp/*>

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3150 2
2 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1571 1
3 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1457 1
4 NAME Centaurus A Sy2 13 25 27.6039817176 -43 01 09.493008456   8.18 6.84 6.66   ~ 4264 3
5 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4094 2
6 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2411 2
7 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2728 2
8 QSO B1413+135 BLL 14 15 58.81750938 +13 20 23.7129069   21.055 20.000 18.461   ~ 405 1
9 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13091 0
10 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 616 1
11 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1101 1
12 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1174 2

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2022.08.10-19:28:48

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