J/ApJ/956/93 Long-term 2.25 and 8.60GHz obs. of XTE J1810-197 (Huang+, 2023)
Simultaneous 2.25/8.60 GHz observations of the magnetar XTE J1810-197.
Huang Z.-P., Yan Z., Shen Z.-Q., Tong H., Yuan J.-P., Lin L., Zhao R.-B.,
Wu Y.-J., Liu J., Wang R., Wang X.-W.
<Astrophys. J., 956, 93 (2023)>
=2023ApJ...956...93H 2023ApJ...956...93H
ADC_Keywords: Pulsars; Radio sources
Keywords: Radio pulsars ; Magnetars
Abstract:
We did 194 epochs of simultaneous 2.25/8.60 GHz observations of
XTE_J1810-197 in 926 days shortly following its reactivation in 2018
with Shanghai Tian Ma Radio Telescope (TMRT). Although its integrated
profiles changed with both time and frequency during this period, they
could be classified into 12 types according to phase areas of active
radiation components. After MJD 59015, XTE J1810-197 turned from the
normal emission state into the spiky emission state that was
manifesting as a series of bright narrow sub-pulse bursts at both
2.25 and 8.60GHz. Due to its variable integrated profiles and unsteady
rotations, we got the spin frequency ν and spin-frequency
derivatives {dot}nu with the piecewise fitting method. In addition,
its long-term declining trend of ν was also obtained as
{dot}nu=-3.2(1)x10-13s-2 with the linear fitting method based on
our observations spanning a comparatively longer period. We found its
flux densities went through three stages: sharp decrease,
stabilization, and day-to-day fluctuations in our dual-frequency
observations. Although the flux density showed different stages,
XTE_J1810-197 showed a relatively flat spectrum (α>-1) in most
observations. Assuming an ideal dipole magnetic field as some previous
research works, we obtained the emission heights of XTE J1810-197 were
about 7.5(9)x104km and 2.38(7)x104km at 2.25 and 8.60GHz,
respectively. We also found that its emission heights would decrease
rapidly with the degree of magnetic field twisting.
Description:
Using the Shanghai Tian Ma Radio Telescope (TMRT), we conducted
simultaneous 2.25/8.60GHz observation of the magnetar XTE J1810-197
from MJD58501 (2019-Jan-18) to MJD59427 (2021-Aug-01) with
194 observing sessions.
Objects:
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RA (ICRS) DE Designation(s)
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18 09 51.07 -19 43 51.7 XTE J1810-197 = PSR J1809-1943
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 194 Parameters of XTE J1810-197
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See also:
B/psr : ATNF Pulsar Catalogue (Manchester+, 2005)
J/A+A/445/243 : Pulsar subpulse modulations at 21cm (Weltevrede+, 2006)
J/A+A/493/339 : XMM-Newton serendipitous Survey. V. (Watson+, 2009)
J/ApJS/212/6 : The McGill magnetar catalog (Olausen+, 2014)
J/MNRAS/473/4436 : Spectral properties of 441 radio pulsars (Jankowski+, 2018)
J/A+A/645/A18 : SVOM-ECLAIRs known X-ray sources catalogue (Dagoneau+, 2021)
J/ApJ/931/67 : XTEJ1810-197 follow-up 300-1450MHz GMRT obs. (Maan+, 2022)
J/MNRAS/511/4669 : Study of galactic PSRs mainly from ATNF (Kutukcu+, 2022)
J/A+A/686/A144 : XTE J1810-197 high-cadence monitoring (Bause+, 2024)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- MJD [58501/59427]? Date of observation (1)
7- 9 I3 min Length [9/416]? Observation duration
11- 15 F5.2 mJy S2.25GHz [0.3/14.62]? Flux density at 2.25GHz
17- 20 F4.2 mJy e_S2.25GHz [0.05/0.4]? Uncertainty in S2.25GHz
22- 26 F5.2 mJy S8.60GHz [0.2/13.91]? Flux density at 8.60GHz
28- 31 F4.2 mJy e_S8.60GHz [0.02/0.2]? Uncertainty in S8.60GHz
33- 37 F5.2 --- Sp+Ind [-1.96/1.06]? Spectral index
39- 42 F4.2 --- e_Sp+Ind [0.01/0.21]? Uncertainty in Sp+Ind
44- 48 F5.2 deg W10(2.25GHz) [10.3/40.5]? The width at 10∼percent of
peak in the P1/2 radiation region at
2.25GHz
50- 54 F5.2 deg e_W10(2.25GHz) [0.28/24.6]? Uncertainty in W10(2.25GHz)
56- 60 F5.2 deg W10(8.60GHz) [9.8/39.4]? The width at 10∼percent of
peak in the P1/2 radiation region at
8.60GHz
62- 66 F5.2 deg e_W10(8.60GHz) [0.1/10.6]? Uncertainty in W10(8.60GHz)
68 A1 --- Shape(2.25GHz) Number of peak in integrated profile at
2.25GHz (2)
70 A1 --- Shape(8.60GHz) Number of peak in integrated profile at
8.60GHz (2)
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Note (1): Observations after MJD 59015 showed the spiky emission state.
Note (2): The shape of the integrated profile of XTE∼J1810-197 is
categorized into single (S), double (D), triple (T), quadruple
(Q), and pentuple (P) peak components.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Jan-2026