Detection of the magnetar SGR J1745-2900 up to 291 GHz with evidence of polarized millimetre emission

Abstract

In Torne et al. (2015), we showed detections of SGR J1745-2900 up to 225 GHz (1.33 mm); at that time the highest radio frequency detection of pulsar emission. In this work, we present the results of new observations of the same magnetar with detections up to 291 GHz (1.03 mm), together with evidence of linear polarization in its millimetre emission. SGR J1745-2900 continues to show variability and is, on average, a factor $\sim$4 brighter in the millimetre band than in our observations of July 2014. The new measured spectrum is slightly inverted, with $⟨\alpha ⟩=+0.4\pm 0.2$ (for $S_{\nu }\propto {\nu }^{\alpha })$. However, the spectrum does not seem to be well described by a single power law, which might be due to the intrinsic variability of the source, or perhaps a turn-up somewhere between 8.35 and 87 GHz. These results may help us to improve our still incomplete model of pulsar emission and, in addition, they further support the search for and study of pulsars located at the Galactic Centre using millimetre wavelengths.

arXiv comment7 pages, 4 figures, 2 tables. Accepted for publication in MNRAS

References in corpus (21)

• The McGill Magnetar Catalog
• A strong magnetic field around the supermassive black hole at the centre of the Galaxy
• Transient pulsed radio emission from a magnetar
• 1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
• Pulsar spectra of radio emission
• A Radio-loud Magnetar in X-ray Quiescence
• The magnetar 1E 1547.0-5408: radio spectrum, polarimetry, and timing
• The magnetar XTE J1810-197: variations in torque, radio flux density and pulse profile morphology
• Radio properties of the magnetar near Sagittarius A* from observations with the Australia Telescope Compact Array
• Polarized radio emission from a magnetar
• Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622-4950
• The Angular Broadening of the Galactic Center Pulsar SGR J1745-29: A New Constraint on the Scattering Medium
• Pulse Broadening Measurements from the Galactic Center Pulsar J1745--2900
• The variable radio-to-X-ray spectrum of the magnetar XTE J1810-197
• The Proper Motion of the Galactic Center Pulsar Relative to Sagittarius A*
• Simultaneous multifrequency radio observations of the Galactic Centre magnetar SGR J1745-2900
• Radio spectrum of the AXP J1810-197 and of its profile components
• Pulsar Electrodynamics: an unsolved problem
• Simultaneous Multi-band Radio & X-ray Observations of the Galactic Center Magnetar SGR 1745$-$2900
• Observations of pulsars at 9 millimetres
• Rotation Measure synthesis study and polarized properties of PSR J1745-2900 at 7 mm

Cited by in corpus (29)

• Highest-frequency detection of FRB 121102 at 4-8 GHz using the Breakthrough Listen Digital Backend at the Green Bank Telescope
• Revival of the magnetar PSR J1622-4950: observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR
• Magnetars: a short review and some sparse considerations
• TeraHertz Exploration and Zooming-in for Astrophysics (THEZA): ESA Voyage 2050 White Paper
• Pulse Morphology of the Galactic Center Magnetar PSR J1745-2900
• Multiwavelength Radio Observations of Two Repeating Fast Radio Burst Sources: FRB 121102 and FRB 180916.J0158+65
• Radio and X-ray observations of giant pulses from XTE J1810-197
• High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst
• Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy
• An 86-GHz search for Pulsars in the Galactic Center with the Atacama Large Millimeter/submillimeter Array
• Searching for pulsars in the Galactic Centre at 3 and 2 mm
• ALMA and VLA observations of emission from the environment of Sgr A*
• Simultaneous 2.25/8.60 GHz observations of the newly discovered magnetar -- Swift J1818.0-1607
• Detection of the magnetar XTE J1810-197 at 150 and 260 GHz with the NIKA2 Kinetic Inductance Detector camera
• Observations of Radio Magnetars with the Deep Space Network
• 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
• Detection of pulses from the Vela pulsar at millimeter wavelengths with phased ALMA
• The High Time Resolution Universe Pulsar Survey -- XVIII. The reprocessing of the HTRU-S Low Lat survey around the Galactic centre using a Fast Folding Algorithm pipeline for accelerated pulsars
• High Frequency Radio Observations of Two Magnetars, PSR J1622$-$4950 and 1E 1547.0$-$5408
• Single-pulse observations of the Galactic Center magnetar PSR J1745$-$2900 at 3.1 GHz
• A transient, flat spectrum radio pulsar near the Galactic centre
• $4-8\mathrm{GHz}$ Spectro-temporal Emission from the Galactic Center Magnetar $\mathrm{PSR}J1745-2900$
• VLA Observations of Single Pulses from the Galactic Center Magnetar
• The Low Frequency Perspective on Fast Radio Bursts
• ALMA discovery of Punctum -- a highly polarized mm source in nuclear starburst galaxy NGC 4945
• Tera-Hertz Counterparts to Fast Radio Bursts from Coherent Cherenkov Radiation by Tilted Bunches
• Retuning radio astronomy for axion dark matter with neutron stars
• Pulsar observations at millimetre wavelengths