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GMRT discovery of PSR J1544+4937, an eclipsing black-widow pulsar identified with a Fermi LAT source
High Energy Astrophysical Phenomena · Submitted 26 Apr 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J1544.2+4941.
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The abstract, sentence by sentence
Using the Giant Metrewave Radio Telescope (GMRT) we performed deep observations to search for radio pulsations in the directions of unidentified Fermi Large Area Telescope (LAT) gamma-ray sources. We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J1544.2+4941. This 2.16 ms pulsar is in a 2.9 hours compact circular orbit with a very low-mass companion (Mc > 0.017 Msun). At 322 MHz this pulsar is found to be eclipsing for 13% of its orbit, whereas at 607 MHz the pulsar is detected throughout the low-frequency eclipse phase. Variations in the eclipse ingress phase are observed, indicating a clumpy and variable eclipsing medium. Moreover, additional short-duration absorption events are observed around the eclipse boundaries. Using the radio timing ephemeris we were able to detect gamma-ray pulsations from this pulsar, confirming it as the source powering the gamma-ray emission.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Using the Giant Metrewave Radio Telescope (GMRT) we performed deep observations to search for radio pulsations in the directions of unidentified Fermi Large Area Telescope (LAT) gamma-ray sources. | method 0.98 | 0.96 | 0.03 | asserted 0.91 |
| s1 | We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J1544.2+4941. | result 0.59 | 0.96 | 0.88 | asserted 1.00 |
| s2 | This 2.16 ms pulsar is in a 2.9 hours compact circular orbit with a very low-mass companion (Mc > 0.017 Msun). | result 1.00 | 0.88 | 0.11 | asserted 1.00 |
| s3 | At 322 MHz this pulsar is found to be eclipsing for 13% of its orbit, whereas at 607 MHz the pulsar is detected throughout the low-frequency eclipse phase. | result 1.00 | 0.95 | 0.06 | asserted 1.00 |
| s4 | Variations in the eclipse ingress phase are observed, indicating a clumpy and variable eclipsing medium. | interpretation 0.53 | 0.93 | 0.04 | hedged possibility 0.80 |
| s5 | Moreover, additional short-duration absorption events are observed around the eclipse boundaries. | result 1.00 | 0.94 | 0.03 | asserted 1.00 |
| s6 | Using the radio timing ephemeris we were able to detect gamma-ray pulsations from this pulsar, confirming it as the source powering the gamma-ray emission. | result 0.96 | 0.96 | 0.48 | asserted 1.00 |
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Original abstract
Using the Giant Metrewave Radio Telescope (GMRT) we performed deep observations to search for radio pulsations in the directions of unidentified Fermi Large Area Telescope (LAT) gamma-ray sources. We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J1544.2+4941. This 2.16 ms pulsar is in a 2.9 hours compact circular orbit with a very low-mass companion (Mc > 0.017 Msun). At 322 MHz this pulsar is found to be eclipsing for 13% of its orbit, whereas at 607 MHz the pulsar is detected throughout the low-frequency eclipse phase. Variations in the eclipse ingress phase are observed, indicating a clumpy and variable eclipsing medium. Moreover, additional short-duration absorption events are observed around the eclipse boundaries. Using the radio timing ephemeris we were able to detect gamma-ray pulsations from this pulsar, confirming it as the source powering the gamma-ray emission.
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References
How the literature uses it
1 arXiv paper cite this in 1 sentence
Papers citing it
Uses its data or values 1 paper
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J0307+7443 3.16 2.2 mbr [ref] J0737$-$3039A 22.7 0.59 r [ref] J1055$-$6028 99.7 120 r [ref] J1311$-$3430 2.56 4.9 mbgu [ref] J1544+4937 2.16 1.2 mbru [ref] J1640+2224 3.16 0.35 mbr [ref] J1705$-$1906 299.0 0.61 r [ref] J1732$-$5049 5.31 0.37 mrb [ref] J1745+1017 2.65 0.53 mbru [ref] J1816+4510 3.19 5.2 mbru [ref] J1824$-$2452A 3.05 220 mr [ref] ; Johnson et al. (in prep.) J1843$-$1113 1.85 6.0 mr [ref] J1913+0904 163.2 16 r [ref] J2256$-$1024 2.29 5.2 mbru [ref] J2339$-$0533 2.88 2.3 mbru Ray et al. (in prep.)
The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars · Introduction · 0.95
What it cites · 4 sentences without a confident label
Uses the method or tool of 1 paper
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If we assume that the deep, variable radio eclipses imply a near Roche lobe filling companion, and consider a typical inclination angle $=60^∘$, an unheated (backside) companion temperature of 2500 K and $η= 0.15$, we can use the binary light-curve synthesis program `Icarus' [ref] to predict magnitudes at phase $ϕ_B=0.57$ of $g^'≈25.2$, $r^'≈23.9$ and $i^'≈23.1$ (magnitudes at maximum are 23.0, 21.9 and 21.5, respectively).
KOI 1224, a Fourth Bloated Hot White Dwarf Companion Found With Kepler · X-ray and optical observations · 0.99
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