2011A&A...534L...1K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.06CET15:01:57

2011A&A...534L...1K - Astronomy and Astrophysics, volume 534, L1-1 (2011/10-1)

Detection of six rapidly scintillating active galactic nuclei and the diminished variability of J1819+3845.

KOAY J.Y., BIGNALL H.E., MacQUART J.-P., JAUNCEY D.L., RICKETT B.J. and LOVELL J.E.J.

Abstract (from CDS):

The extreme, intra-hour and >10% rms flux density scintillation observed in AGNs such as PKS 0405-385, J1819+3845 and PKS 1257-326 at cm wavelengths has been attributed to scattering in highly turbulent, nearby regions in the interstellar medium. Such behavior has been found to be rare. We searched for rapid scintillators among 128 flat spectrum AGNs and analyzed their properties to determine the origin of such rapid and large amplitude radio scintillation. The sources were observed at the VLA at 4.9 and 8.4GHz simultaneously at two hour intervals over 11 days. We detected six rapid scintillators with characteristic time-scales of <2h, none of which have rms variations >10%. We found strong lines of evidence linking rapid scintillation to the presence of nearby scattering regions, estimated to be <12pc away for ∼200µas sources and <250pc away for ∼10µas sources. We attribute the scarcity of rapid and large amplitude scintillators to the requirement of additional constraints, including large source compact fractions. J1819+3845 was found to display ∼2% rms variations at ∼6h time-scales superposed on longer >11 day variations, suggesting that the highly turbulent cloud responsible for its extreme scintillation has moved away, with its scintillation now caused by a more distant screen ≃50 to 150pc away.

Abstract Copyright:

Journal keyword(s): quasars: general - galaxies: active - radio continuum: ISM - scattering - ISM: structure - quasars: individual: J1819+3845

Simbad objects: 13

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Number of rows : 13

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 QSO B0405-385 QSO 04 06 59.03533560 -38 26 28.0423567   19.55 18.0     ~ 197 2
2 SDSS J080034.37+485424.0 QSO 08 00 34.37224 +48 54 24.0055           ~ 8 0
3 MASIV J0829+4018 BL? 08 29 35.5795 +40 18 59.282           ~ 4 0
4 PSR B0834+06 Psr 08 37 05.642 +06 10 14.56           ~ 380 0
5 6C 092554+502611 BLL 09 29 15.4400532384 +50 13 35.987058917   17.18 16.80 15.94   ~ 111 2
6 MASIV J0949+5819 Rad 09 49 39.81 +58 19 12.9           ~ 1 0
7 ICRF J104946.3+142938 BLL 10 49 46.32758343 +14 29 38.5738701           ~ 12 1
8 Ton 599 QSO 11 59 31.83390975 +29 14 43.8268741   14.80 14.41 17.652 13.39 ~ 781 1
9 [VV98] J130042.4-325312 QSO 13 00 42.4254849462 -32 53 12.118806423     18.70 18   ~ 70 0
10 7C 132656.50+623705.00 QSO 13 28 40.5645180553 +62 21 37.039868859   19.53 19.13     ~ 25 2
11 QSO B1547+507 QSO 15 49 17.46855479 +50 38 05.7882265   18.89 18.74 18.16   ~ 102 1
12 ICRF J181926.5+384501 SyG 18 19 26.54737811 +38 45 01.7863328           ~ 105 0
13 87GB 192949.6+473705 QSO 19 31 16.5460970396 +47 43 41.212469308           ~ 10 1

    Equat.    Gal    SGal    Ecl

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2019.12.06-15:01:57

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