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Featured researches published by Aquib Moin.


Monthly Notices of the Royal Astronomical Society | 2012

The first resolved imaging of milliarcsecond-scale jets in Circinus X-1

J. C. A. Miller-Jones; Aquib Moin; S. J. Tingay; Cormac Reynolds; Christopher J. Phillips; A. Tzioumis; R. P. Fender; Jamie McCallum; G. D. Nicolson; V. Tudose

We present the first resolved imaging of the milliarcsecond-scale jets in the neutron star X-ray binary Circinus X-1, made using the Australian Long Baseline Array. The angular extent of the resolved jets is ~20mas, corresponding to a physical scale of ~150au at the assumed distance of 7.8kpc. The jet position angle is relatively consistent with previous arcsecond-scale imaging with the Australia Telescope Compact Array. The radio emission is symmetric about the peak, and is unresolved along the minor axis, constraining the opening angle to be 15) flow previously inferred to exist in this system.


The Astrophysical Journal | 2013

RADIO OBSERVATIONS OF GRB 100418a: TEST OF AN ENERGY INJECTION MODEL EXPLAINING LONG-LASTING GRB AFTERGLOWS

Aquib Moin; P. Chandra; J. C. A. Miller-Jones; S. J. Tingay; G. B. Taylor; Dale A. Frail; Z. X. Wang; Cormac Reynolds; Christopher J. Phillips

We present the results of our radio observational campaign of gamma-ray burst (GRB) 100418a, for which we used the Australia Telescope Compact Array, the Very Large Array, and the Very Long Baseline Array. GRB 100418a was a peculiar GRB with unusual X-ray and optical afterglow profiles featuring a plateau phase with a very shallow rise. This observed plateau phase was believed to be due to a continued energy injection mechanism that powered the forward shock, giving rise to an unusual and long-lasting afterglow. The radio afterglow of GRB 100418a was detectable several weeks after the prompt emission. We conducted long-term monitoring observations of the afterglow and attempted to test the energy injection model advocating that the continuous energy injection is due to shells of material moving at a wide range of Lorentz factors. We obtained an upper limit of γ < 7 for the expansion rate of the GRB 100418a radio afterglow, indicating that the range-of-Lorentz factor model could only be applicable for relatively slow-moving ejecta. A preferred explanation could be that continued activity of the central engine may have powered the long-lasting afterglow.


Monthly Notices of the Royal Astronomical Society | 2011

e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on au scales

Aquib Moin; Cormac Reynolds; J. C. A. Miller-Jones; S. J. Tingay; Christopher J. Phillips; A. Tzioumis; G. D. Nicolson; R. P. Fender

A recent detection of the peculiar neutron star X-ray binary Circinus X-1 with electronic very long baseline interferometry (e-VLBI) prompted the suggestion that compact, non-variable radio emission persists through the entire 16.6-d orbit of the binary system. We present the results of a high angular resolution monitoring campaign conducted with the Australian Long Baseline Array in real-time e-VLBI mode. e-VLBI observations of Circinus X-1 were made on alternate days over a period of 20 d covering the full binary orbit. A compact radio source associated with Circinus X-1 was clearly detected at orbital phases following periastron passage, but no compact radio emission was detected at any other orbital phase, ruling out the presence of a persistent, compact emitting region at our sensitivity levels. The jet was not resolved at any epoch of our 1.4-GHz monitoring campaign, suggesting that the ultrarelativistic flow previously inferred to exist in this source is likely to be dark. We discuss these findings within the context of previous radio monitoring of Circinus X-1.


The astronomer's telegram | 2010

Radio brightening of Circinus X-1

D. Calvelo; Robert P. Fender; J. Broderick; Aquib Moin; S. J. Tingay; A. K. Tzioumis; G. D. Nicolson


Archive | 2010

Astrometric Observations of Circinus X-1

J. C. A. Miller-Jones; Steven J. Tingay; Aquib Moin


Archive | 2010

Radio detection of GRB100418a with ATCA.

Aquib Moin; S. J. Tingay; Cynthia Kieras Phillips; G. B. Taylor; Mark Hendrik Wieringa; Richard P. Martin


Archive | 2009

Radio observation of GRB 081226a with ATCA.

Aquib Moin; Steven J. Tingay; Cynthia Kieras Phillips; G. Taylor; Mark Hendrik Wieringa; Richard P. Martin


Archive | 2009

Radio observation of GRB 081226b with ATCA.

Aquib Moin; Steven J. Tingay; Cynthia Kieras Phillips; G. Taylor; Mark Hendrik Wieringa; Richard P. Martin


Archive | 2009

Radio observation of GRB 090117 with ATCA.

Aquib Moin; Steven J. Tingay; Cynthia Kieras Phillips; G. Taylor; Mark Hendrik Wieringa; Richard P. Martin


Archive | 2009

A Southern Sky survey to detect and monitor radio afterglows associated with recently detected gamma-ray bursts (GRBs)

Aquib Moin; Christopher J. Phillips; Steven J. Tingay; Greg Taylor; Ralph Robert Martin; Mark Hendrik Wieringa

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Steven J. Tingay

Australia Telescope National Facility

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Mark Hendrik Wieringa

Australia Telescope National Facility

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Cynthia Kieras Phillips

Australia Telescope National Facility

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Christopher J. Phillips

Australia Telescope National Facility

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G. D. Nicolson

Hartebeesthoek Radio Astronomy Observatory

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Dale A. Frail

National Radio Astronomy Observatory

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