MeerKAT Pulsar Timing Array parallaxes and proper motions
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910296232165376 |
|---|---|
| author | Shamohammadi, Mohsen Bailes, Matthew Flynn, Christopher Reardon, Daniel J. Shannon, Ryan M. Buchner, Sarah Cameron, Andrew D. Camilo, Fernando Coronigu, Alessandro Geyer, Marisa Kramer, Michael Miles, Matthew Spiewak, Renee |
| author_facet | Shamohammadi, Mohsen Bailes, Matthew Flynn, Christopher Reardon, Daniel J. Shannon, Ryan M. Buchner, Sarah Cameron, Andrew D. Camilo, Fernando Coronigu, Alessandro Geyer, Marisa Kramer, Michael Miles, Matthew Spiewak, Renee |
| contents | We have determined positions, proper motions, and parallaxes of $77$ millisecond pulsars (MSPs) from $\sim3$ years of MeerKAT radio telescope observations. Our timing and noise analyses enable us to measure $35$ significant parallaxes ($12$ of them for the first time) and $69$ significant proper motions. Eight pulsars near the ecliptic have an accurate proper motion in ecliptic longitude only. PSR~J0955$-$6150 has a good upper limit on its very small proper motion ($<$0.4 mas yr$^{-1}$). We used pulsars with accurate parallaxes to study the MSP velocities. This yields $39$ MSP transverse velocities, and combined with MSPs in the literature (excluding those in Globular Clusters) we analyse $66$ MSPs in total. We find that MSPs have, on average, much lower velocities than normal pulsars, with a mean transverse velocity of only $78(8)$ km s$^{-1}$ (MSPs) compared with $246(21)$ km s$^{-1}$ (normal pulsars). We found no statistical differences between the velocity distributions of isolated and binary millisecond pulsars. From Galactocentric cylindrical velocities of the MSPs, we derive 3-D velocity dispersions of $σ_ρ$, $σ_ϕ$, $σ_{z}$ = $63(11)$, $48(8)$, $19(3)$ km s$^{-1}$. We measure a mean asymmetric drift with amplitude $38(11)$ km s$^{-1}$, consistent with expectation for MSPs, given their velocity dispersions and ages. The MSP velocity distribution is consistent with binary evolution models that predict very few MSPs with velocities $>300$ km s$^{-1}$ and a mild anticorrelation of transverse velocity with orbital period. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_06963 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | MeerKAT Pulsar Timing Array parallaxes and proper motions Shamohammadi, Mohsen Bailes, Matthew Flynn, Christopher Reardon, Daniel J. Shannon, Ryan M. Buchner, Sarah Cameron, Andrew D. Camilo, Fernando Coronigu, Alessandro Geyer, Marisa Kramer, Michael Miles, Matthew Spiewak, Renee High Energy Astrophysical Phenomena We have determined positions, proper motions, and parallaxes of $77$ millisecond pulsars (MSPs) from $\sim3$ years of MeerKAT radio telescope observations. Our timing and noise analyses enable us to measure $35$ significant parallaxes ($12$ of them for the first time) and $69$ significant proper motions. Eight pulsars near the ecliptic have an accurate proper motion in ecliptic longitude only. PSR~J0955$-$6150 has a good upper limit on its very small proper motion ($<$0.4 mas yr$^{-1}$). We used pulsars with accurate parallaxes to study the MSP velocities. This yields $39$ MSP transverse velocities, and combined with MSPs in the literature (excluding those in Globular Clusters) we analyse $66$ MSPs in total. We find that MSPs have, on average, much lower velocities than normal pulsars, with a mean transverse velocity of only $78(8)$ km s$^{-1}$ (MSPs) compared with $246(21)$ km s$^{-1}$ (normal pulsars). We found no statistical differences between the velocity distributions of isolated and binary millisecond pulsars. From Galactocentric cylindrical velocities of the MSPs, we derive 3-D velocity dispersions of $σ_ρ$, $σ_ϕ$, $σ_{z}$ = $63(11)$, $48(8)$, $19(3)$ km s$^{-1}$. We measure a mean asymmetric drift with amplitude $38(11)$ km s$^{-1}$, consistent with expectation for MSPs, given their velocity dispersions and ages. The MSP velocity distribution is consistent with binary evolution models that predict very few MSPs with velocities $>300$ km s$^{-1}$ and a mild anticorrelation of transverse velocity with orbital period. |
| title | MeerKAT Pulsar Timing Array parallaxes and proper motions |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.06963 |