A blazar candidate for the Fermi source 4FGL J1848.7–0129

Luque-Escamilla, Pedro L.; Martı́, Josep; Mestre, Enrique; Combi, J. A.; Colombo, J. F. Albacete

doi:10.1093/mnras/stac3296

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…The pulsar candidate discovered in the VLITE image is the same source recently reported as a flat spectrum blazar candidate in Luque-Escamilla et al (2023) based on measurements in archival radio data from the TGSSr (150 MHz) and the MAGPIS (90 cm/350 MHz; Helfand et al 2006) radio surveys. They find that it is coincident with a variable X-ray source in the Chandra data.…”

Section: Discussion Of Pulsar In Glimpse-c01mentioning

confidence: 54%

“…The source is not seen in the higher-frequency (20 cm) images of MAGPIS, with a limit that requires a spectral index of α < −1.1. Luque-Escamilla et al (2023) suggest that this is due to temporal variability of the radio flux density. However, we note that the TGSSr data at this position were recorded in 2010, while the MAGPIS 90 cm data at this position were observed in 2001.…”

Section: Discussion Of Pulsar In Glimpse-c01mentioning

confidence: 95%

“…Based on the tentative blazar association, this source was suggested by Luque-Escamilla et al (2023) to be the counterpart of a Fermi source with an overlapping source error circle. In the context of the pulsar interpretation, this association is extremely unlikely, given that the inferred spin-down luminosity from the X-ray data is smaller than the gamma-ray luminosity if the gamma-ray source is in GLIMPSE-C01.…”

Section: Discussion Of Pulsar In Glimpse-c01mentioning

confidence: 99%

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A VLITE Search for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01

McCarver,

Maccarone,

Ransom

et al. 2024

ApJ

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We present results from a search for pulsars in globular clusters, including the discovery of a new millisecond pulsar in the stellar cluster GLIMPSE-C01. We searched for low-frequency radio sources within 97 globular clusters using images from the VLA Low-band Ionosphere and Transient Experiment (VLITE) and epochs 1 and 2 of the VLITE Commensal Sky Survey. We discovered 10 sources in our search area, four more than expected from extragalactic source counts at our sensitivity limits. The strongest pulsar candidate was a point source found in GLIMPSE-C01 with a spectral index ∼ − 2.6, and we present additional measurements at 0.675 and 1.25 GHz from the GMRT and 1.52 GHz from the VLA that confirm the spectral index. Using archival Green Bank Telescope S-band data from 2005, we detect a binary pulsar with a spin period of 19.78 ms within the cluster. Although we cannot confirm that this pulsar is at the same position as the steep-spectrum source using the existing data, the pulse flux is consistent with the predicted flux density from other frequencies, making it a probable match. The source also shows strong X-ray emission, indicative of a higher magnetic field than most millisecond pulsars, suggesting that its recycling was interrupted. We demonstrate that low-frequency searches for steep-spectrum sources are an effective way to identify pulsar candidates, in particular on sightlines with high dispersion.

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Section: Discussion Of Pulsar In Glimpse-c01mentioning

confidence: 54%

Section: Discussion Of Pulsar In Glimpse-c01mentioning

confidence: 95%

Section: Discussion Of Pulsar In Glimpse-c01mentioning

confidence: 99%

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A VLITE Search for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01

McCarver,

Maccarone,

Ransom

et al. 2024

ApJ

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A Radio-loud Semiregular Variable

Luque-Escamilla,

Martí

2024

ApJ

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As a byproduct of our search for Galactic stellar systems with gamma-ray emission, we have identified an unrelated cool and evolved star (IRC-10412) that attracted our attention due to its strong radio emission level with a spectral index matching, almost perfectly, the canonical +0.6 value expected from an ionized stellar wind. A follow-up observational analysis was undertaken given that these two properties are hard to reconcile as originating in the same stellar object. As a result, IRC-10412 has been classified as a new semiregular variable of SRb type in the asymptotic giant branch, and different but consistent estimates of its mass-loss parameter are reported. We propose that its unusually high radio emission arises from a ∼10−5 M ⊙ yr−1 stellar wind exposed to an external source of ionizing photons, possibly coming from nearby OB associations.

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No Compact Radio Emission from the Proposed Blazar Candidate Counterpart for the Fermi Source 4FGL J1848.7–0129

2023

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By assessing available radio data, we argue that the recently proposed new counterpart for the Fermi γ-ray source 4FGL J1848.7−0129 is unlikely to be a blazar. The radio source coincident with a Chandra X-ray point source is extended on ∼10″ angular scale, has no detected compact component (3 GHz flux density ≲1 mJy), and its radio spectrum is steep. These properties contradict to what is expected for blazars with relativistically beamed radio jet emission.

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A blazar candidate for the Fermi source 4FGL J1848.7–0129

Cited by 3 publications

References 37 publications

A VLITE Search for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01

A VLITE Search for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01

A Radio-loud Semiregular Variable

No Compact Radio Emission from the Proposed Blazar Candidate Counterpart for the Fermi Source 4FGL J1848.7–0129

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