Siggma: A Survey of Ionized Gas in the Galaxy, Made With the Arecibo Telescope

Liu, Bin; McIntyre, Travis; Terzian, Yervant; Minchin, R. F.; Churchwell, E.; Lebrón, M.; Roshi, D. Anish

doi:10.1088/0004-6256/146/4/80

Cited by 28 publications

(26 citation statements)

References 41 publications

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“…In particular, we have reciprocal data-sharing agreements with collaborations that search for galaxies in the optically obscured ("zone of avoidance") directions through the Milky Way (Henning et al 2010) and recombination-line studies of ionized gas in the Milky Way (Liu et al 2013). The PALFA project leads inner Galaxy observing sessions, whereas our partners lead outer Galaxy sessions.…”

Section: Observationsmentioning

confidence: 99%

Arecibo Pulsar Survey Using Alfa. Iv. Mock Spectrometer Data Analysis, Survey Sensitivity, and the Discovery of 40 Pulsars

Lazarus

Brazier

Hessels

et al. 2015

ApJ

130

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The on-going Arecibo Pulsar-ALFA (PALFA) survey began in 2004 and is searching for radio pulsars in the Galactic plane at 1.4 GHz. Here we present a comprehensive description of one of its main data reduction pipelines that is based on the PRESTO software and includes new interference-excision algorithms and candidate selection heuristics. This pipeline has been used to discover 40 pulsars, bringing the survey's discovery total to 144 pulsars. Of the new discoveries, eight are millisecond pulsars (MSPs; P 10 < ms) and one is a Fast Radio Burst (FRB). This pipeline has also re-detected 188 previously known pulsars, 60 of them previously discovered by the other PALFA pipelines. We present a novel method for determining the survey sensitivity that accurately takes into account the effects of interference and red noise: we inject synthetic pulsar signals with various parameters into real survey observations and then attempt to recover them with our pipeline. We find that the PALFA survey achieves the sensitivity to MSPs predicted by theoretical models but suffers a degradation for P 100  ms that gradually becomes up to ∼10 times worse for P 4 s > at DM 150 < pc cm −3 . We estimate 33 ± 3% of the slower pulsars are missed, largely due to red noise. A population synthesis analysis using the sensitivity limits we measured suggests the PALFA survey should have found 224 ± 16 un-recycled pulsars in the data set analyzed, in agreement with the 241 actually detected. The reduced sensitivity could have implications on estimates of the number of longperiod pulsars in the Galaxy.

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Section: Observationsmentioning

confidence: 99%

Arecibo Pulsar Survey Using Alfa. Iv. Mock Spectrometer Data Analysis, Survey Sensitivity, and the Discovery of 40 Pulsars

Lazarus

Brazier

Hessels

et al. 2015

ApJ

130

View full text Add to dashboard Cite

show abstract

“…ALFA ZOA takes data simultaneously with a survey for pulsars in the Milky Way (PALFA; e.g., Cordes et al 2006) and a Galactic radio recombination line survey (SIGGMA; Liu et al 2013), as well as several SETI groups that receive data from the ALFA receiver (Astropulse; von Korff et al 2013, SETI@home;Anderson et al 2002, Serendip V.v;Cobb et al 2000). In particular, the first fast radio burst detected with an instrument other than the 13 beam receiver of the Parkes Radio Telescope (Spitler et al 2014) was discovered by PALFA using the same data taken by ALFA ZOA for this paper.…”

Section: Observationsmentioning

confidence: 99%

The Alfa Zoa Deep Survey: First Results

McIntyre¹,

Henning²,

Minchin

et al. 2015

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The Arecibo L-band Feed Array Zone of Avoidance (ALFA ZOA) Deep Survey is the deepest and most sensitive blind H I survey undertaken in the ZOA. ALFA ZOA Deep will cover about 300 square degrees of sky behind the Galactic Plane in both the inner ( l b 30 7 5; 2°⩽ ⩽°⩽ |°|) and outer ( l b 175 207 ; 2 1°⩽ ⩽°−°⩽ ⩽ +°) Galaxy, using the Arecibo Radio Telescope. First results from the survey have found 61 galaxies within a 15 square degree area centered on l 192 =°and b = −2°. The survey reached its expected sensitivity of rms = 1 mJy at 9 km s −1 channel resolution, and is shown to be complete above integrated flux, F HI = 0.5 Jy km s −1 . The positional accuracy of the survey is 28″ and detections are found out to a recessional velocity of nearly 19,000 km s −1 . The survey confirms the extent of the Orion and Abell 539 clusters behind the plane of the Milky Way and discovers expansive voids, at 10,000 and 18,000 km s −1 . Twenty-six detections (43%) have a counterpart in the literature, but only two of these have known redshifts. Counterparts are 20% less common beyond v hel = 10,000 km s −1 and 33% less common at extinctions higher than A B = 3.5 mag. The ALFA ZOA Deep survey is able to probe large scale structure beyond redshifts that even the most modern wide-angle surveys have been able to detect in the ZOA at any wavelength.

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“…The 18 most luminous of these complexes are responsible for just over half the total Galactic ionising flux, and it is thought to be the UV photons "leaking" from the HII region complexes that are responsible for the diffuse warm ionised medium (e.g. Liu et al 2013)). This hypothesis is supported by wide area RRL mapping at ∼15 resolution (Alves et al 2012) which finds that the distribution of the diffuse medium is correlated with HII regions.…”

Section: Early Science: the Structure And Kinematics Of The Most Lumimentioning

confidence: 99%

The ionised,radical and molecular Milky Way: spectroscopic surveys with the SKA

Beuther¹,

Dickinson²,

Mottram³

et al. 2015

Proceedings of Advancing Astrophysics With the Square Kilometre Array — PoS(AASKA14)

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The bandwith, sensitivity and sheer survey speed of the SKA offers unique potential for deep spectroscopic surveys of the Milky Way. Within the frequency bands available to the SKA lie many transitions that trace the ionised, radical and molecular components of the interstellar medium and which will revolutionise our understanding of many physical processes. In this chapter we describe the impact on our understanding of the Milky Way that can be achieved by spectroscopic SKA surveys, including "out of the box" early science with radio recombination lines, Phase 1 surveys of the molecular ISM using anomalous formaldehyde absorption, and full SKA surveys of ammonia inversion lines.Advancing Astrophysics with the Square Kilometre Array

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Siggma: A Survey of Ionized Gas in the Galaxy, Made With the Arecibo Telescope

Cited by 28 publications

References 41 publications

Arecibo Pulsar Survey Using Alfa. Iv. Mock Spectrometer Data Analysis, Survey Sensitivity, and the Discovery of 40 Pulsars

Arecibo Pulsar Survey Using Alfa. Iv. Mock Spectrometer Data Analysis, Survey Sensitivity, and the Discovery of 40 Pulsars

The Alfa Zoa Deep Survey: First Results

The ionised,radical and molecular Milky Way: spectroscopic surveys with the SKA

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