High Frequency Radio Observations of Two Magnetars, PSR J1622$-$4950 and 1E 1547.0$-$5408

Abstract

We investigated the radio spectra of two magnetars, PSR J1622$-$4950 and 1E 1547.0$-$5408, using observations from the Australia Telescope Compact Array and the Atacama Large Millimeter/submillimeter Array taken in 2017. Our observations of PSR J1622$-$4950 show a steep spectrum with a spectral index of $-$1.3 $\pm$ 0.2 in the range of 5.5-45 GHz during its re-activating X-ray outburst in 2017. By comparing the data taken at different epochs, we found significant enhancement in the radio flux density. The spectrum of 1E 1547.0$-$5408 was inverted in the range of 43-95 GHz, suggesting a spectral peak at a few hundred gigahertz. Moreover, we obtained the X-ray and radio data of radio magnetars, PSR J1622$-$4950 and SGR J1745$-$2900, from literature and found two interesting properties. First, radio emission is known to be associated with X-ray outburst but has different evolution. We further found that the rising time of the radio emission is much longer than that of the X-ray during the outburst. Second, the radio magnetars may have double peak spectra at a few GHz and a few hundred GHz. This could indicate that the emission mechanism is different in the cm and the sub-mm bands. These two phenomenons could provide a hint to understand the origin of radio emission and its connection with the X-ray properties.

arXiv comment7 pages, 4 figures, to be published in MNRAS

References in corpus (60)

• The McGill Magnetar Catalog
• A fast radio burst associated with a Galactic magnetar
• A bright millisecond-duration radio burst from a Galactic magnetar
• Electrodynamics of Magnetars: Implications for the Persistent X-ray Emission and Spindown of the Soft Gamma Repeaters and Anomalous X-ray Pulsars
• A fossil origin for the magnetic fields of A-stars and white dwarfs
• A strong magnetic field around the supermassive black hole at the centre of the Galaxy
• Transient pulsed radio emission from a magnetar
• Untwisting magnetospheres of neutron stars
• 1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
• Discovery of Two High-Magnetic-Field Radio Pulsars
• Magnetar-like Emission from the Young Pulsar in Kes 75
• NuSTAR discovery of a 3.76-second transient magnetar near Sagittarius A*
• Discovery of a New Transient Magnetar Candidate: XTE J1810-197
• A Radio-loud Magnetar in X-ray Quiescence
• Changes in the X-ray Emission from the Magnetar Candidate 1E 2259+586 during its 2002 Outburst
• Revival of the magnetar PSR J1622-4950: observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR
• Swift Discovery of a New Soft Gamma Repeater, SGR J1745-29, near Sagittarius A*
• The magnetar 1E 1547.0-5408: radio spectrum, polarimetry, and timing
• A 700 year-old Pulsar in the Supernova Remnant Kes 75
• Radio properties of the magnetar near Sagittarius A* from observations with the Australia Telescope Compact Array
• The Compact X-ray Source 1E 1547.0-5408 and the Radio Shell G327.24-0.13: A New Proposed Association between a Candidate Magnetar and a Candidate Supernova Remnant
• Imaging X-ray, Optical, and Infrared Observations of the Transient Anomalous X-ray Pulsar XTE J1810-197
• A Magnetar-like Outburst from a High-B Radio Pulsar
• Strong bursts from the anomalous X-ray pulsar 1E 1547.0-5408 observed with the INTEGRAL/SPI Anti-Coincidence Shield
• Discovery of Radio Emission from Transient Anomalous X-ray Pulsar XTE J1810-197
• The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197
• Outburst of the 2 s Anomalous X-ray Pulsar 1E 1547.0-5408
• The fundamental plane for radio magnetars
• The 2009 outburst of magnetar 1E 1547-5408: Persistent radiative and burst properties
• Radio disappearance of the magnetar XTE J1810-197 and continued X-ray timing
• Simultaneous multifrequency radio observations of the Galactic Centre magnetar SGR J1745-2900
• Multi-wavelength Observations of the Radio Magnetar PSR J1622-4950 and Discovery of its Possibly Associated Supernova Remnant
• A very young radio-loud magnetar
• Wideband polarized radio emission from the newly revived magnetar XTE J1810$-$197
• Radio spectrum of the AXP J1810-197 and of its profile components
• Magnetar Twists: Fermi/Gamma ray Burst Monitor (GBM) detection of SGR J1550-5418
• Pulsars with gigahertz-peaked spectra
• The 2008 October Swift detection of X-ray bursts/outburst from the transient SGR-like AXP 1E 1547.0-5408
• The X-ray outburst of the Galactic Centre magnetar SGR J1745-2900 during the first 1.5 year
• Detection of the magnetar SGR J1745-2900 up to 291 GHz with evidence of polarized millimetre emission
• Spin frequency evolution and pulse profile variations of the recently re-activated radio magnetar XTE J1810-197
• Chandra and RXTE Observations of 1E 1547.0-5408: Comparing the 2008 and 2009 Outbursts
• Peculiar Spin Frequency and Radio Profile Evolution of PSR J1119$-$6127 Following Magnetar-like X-ray Bursts
• Exceptional flaring activity of the anomalous X-ray pulsar 1E 1547.0-5408
• Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay
• Temporal and spectral evolution in X- and gamma-rays of magnetar 1E 1547.0-5408 since its October 2008 outburst: the discovery of a transient hard pulsed component after its January 2009 outburst
• Electrodynamics of Magnetars IV: Self-Consistent Model of the Inner Accelerator, with Implications for Pulsed Radio Emission
• Simultaneous Multi-band Radio & X-ray Observations of the Galactic Center Magnetar SGR 1745$-$2900
• Detection of spectral evolution in the bursts emitted during the 2008-2009 active episode of SGR J1550 - 5418
• Post-Outburst Radio Observations of the High Magnetic Field Pulsar PSR J1119-6127
• NICER Observation of the Temporal and Spectral Evolution of Swift J1818.0-1607: a Missing Link between Magnetars and Rotation Powered Pulsars
• Spin-down evolution and radio disappearance of the magnetar PSR J1622$-$4950
• Magnetar-like X-ray bursts suppress pulsar radio emission
• No detectable radio emission from the magnetar-like pulsar in Kes 75
• The 2018 X-ray and Radio Outburst of Magnetar XTE J1810-197
• 17 and 24 GHz observations of southern pulsars
• Evolution of the X-ray Properties of the Transient Magnetar XTE J1810-197
• Do radio magnetars J1550-5418 and J1622-4950 have gigahertz-peaked spectra?
• The long-term enhanced brightness of the magnetar 1E 1547.0-5408
• Detection of the magnetar XTE J1810-197 at 150 and 260 GHz with the NIKA2 Kinetic Inductance Detector camera

Cited by in corpus (4)

• Submillimeter pulsations from the magnetar XTE J1810-197
• Detection of a dense group of hyper-compact radio sources in the central parsec of the Galaxy
• Multi-frequency radio observations of the radio-loud magnetar XTE J1810-197
• Radio Emission of Pulsars. II. Coherence Catalyzed by Cerenkov-Unstable Shear Alfvén Waves