The Atacama Cosmology Telescope: Systematic Transient Search of 3 Day Maps

Li, Yaqiong; Biermann, Emily; Naess, Sigurd; Aiola, Simone; An, Rui; Battaglia, Nicholas; Bhandarkar, Tanay; Calabrese, Erminia; Choi, Steve K.; Crowley, Kevin T.; Devlin, Mark; Duell, Cody J.; Duff, Shannon M.; Dunkley, Jo; Dünner, Rolando; Gallardo, Patricio A.; Guan, Yilun; Hervías-Caimapo, Carlos; Hincks, Adam D.; Hubmayr, Johannes; Huffenberger, Kevin M.; Hughes, John P.; Kosowsky, Arthur; Louis, Thibaut; Mallaby-Kay, Maya; McMahon, Jeff; Nati, Federico; Niemack, Michael D.; Orlowski-Scherer, John; Page, Lyman; Salatino, Maria; Sifón, Cristóbal; Staggs, Suzanne T.; Vargas, Cristian; Vavagiakis, Eve M.; Wang, Yuhan; Wollack, Edward J.

doi:10.3847/1538-4357/ace599

Cited by 5 publications

(1 citation statement)

References 39 publications

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“…These depth-1 maps are part of the ACT data release 6 (DR6), and the exact depth-1 map-making procedure will be detailed in the upcoming DR6 paper. These maps will be of great use generally in searching for transient objects in the millimeter (e.g., Li et al 2023) as well as characterizing the variability of bright sources.…”

Section: Depth-1 Mapsmentioning

confidence: 99%

The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids

Orlowski-Scherer,

Venterea,

Battaglia

et al. 2024

ApJ

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We present fluxes and light curves for a population of asteroids at millimeter wavelengths, detected by the Atacama Cosmology Telescope (ACT) over 18,000 deg2 of the sky using data from 2017 to 2021. We utilize high cadence maps, which can be used in searching for moving objects such as asteroids and trans-Neptunian Objects, as well as for studying transients. We detect 170 asteroids with a signal-to-noise of at least 5 in at least one of the ACT observing bands, which are centered near 90, 150, and 220 GHz. For each asteroid, we compare the ACT measured flux to predicted fluxes from the near-Earth asteroid thermal model fit to WISE data. We confirm previous results that detected a deficit of flux at millimeter wavelengths. Moreover, we report a spectral characteristic to this deficit, such that the flux is relatively lower at 150 and 220 GHz than at 90 GHz. Additionally, we find that the deficit in flux is greater for S-type asteroids than for C-type.

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Section: Depth-1 Mapsmentioning

confidence: 99%

The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids

Orlowski-Scherer,

Venterea,

Battaglia

et al. 2024

ApJ

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The Atacama cosmology telescope: flux upper limits from a targeted search for extragalactic transients

Hervías-Caimapo,

Naess,

Hincks

et al. 2024

Monthly Notices of the Royal Astronomical Society

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We have performed targeted searches of known extragalactic transient events at millimetre wavelengths using nine seasons (2013–2021) of 98, 150, and 229 GHz Atacama Cosmology Telescope (ACT) observations that mapped ∼40 per cent of the sky for most of the data volume. Our data cover 88 gamma-ray bursts (GRBs), 12 tidal disruption events (TDEs) and 203 other transients, including supernovae (SNe). We stack our ACT observations to increase the signal-to-noise ratio of the maps. In all cases but one, we do not detect these transients in the ACT data. The single candidate detection (event AT2019ppm), seen at ∼5σ significance in our data, appears to be due to active galactic nuclei (AGN) activity in the host galaxy coincident with a transient alert. For each source in our search we provide flux upper limits. For example, the medians for the 95% confidence upper limits at 98 GHz are 15, 18, and 16 mJy for GRBs, SNe, and TDEs respectively, in the first month after discovery. The projected sensitivity of future wide-area cosmic microwave background (CMB) surveys should be sufficient to detect many of these events using the methods described in this paper.

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NEW-MUSIC: The Next-generation Extended-Wavelength MUltiband Sub/millimeter Inductance Camera

Golwala,

Beyer,

Cunnane

et al. 2024

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII

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The Next-generation Extended Wavelength-MUltiband Sub/millimeter Inductance Camera (NEW-MUSIC) on the Leighton Chajnantor Telescope (LCT) will be a first-of-its-kind, six-band, transmillimeter-wave ("trans-mm") polarimeter covering 2.4 octaves of spectral bandwidth to open a new window on the trans-mm time-domain frontier, in particular new frontiers in energy, density, time, and magnetic field. NEW-MUSIC's broad spectral coverage will also enable the use of the Sunyaev-Zeldovich effects to study accretion, feedback, and dust content in the hot gaseous haloes of galaxies and galaxy clusters. Six-band spectral energy distributions, with polarization information, will yield new insights into stellar and planetary nurseries. NEW-MUSIC will employ hierarchical, phased arrays of polarization-sensitive superconducting slot-dipole antennas, coupled to photolithographic bandpass filters, to nearly optimally populate LCT's 14 ′ field-of-view with six spectral bands over 80-420 GHz (1:5.25 spectral dynamic range; 2.4 octaves). Light will be routed to Al or AlMn microstripline-coupled, parallel-plate capacitor, lumped-element kinetic inductance detectors (MS-PPC-LEKIDs), an entirely new KID architecture that substantially enhances design flexibility while providing background-limited performance. Innovative, wide-bandwidth, etched silicon structures will be used to antireflection-treat the back-illuminated focal plane. NEW-MUSIC will cost-effectively reuse much of the MUSIC instrument, initially deploying a quarterscale focal plane capable of the bulk of NEW-MUSIC science followed later by a full-FoV focal plane needed for NEW-MUSIC wide-area survey science.

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The Atacama Cosmology Telescope: Systematic Transient Search of 3 Day Maps

Cited by 5 publications

References 39 publications

The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids

The Atacama Cosmology Telescope: Millimeter Observations of a Population of Asteroids or: ACTeroids

The Atacama cosmology telescope: flux upper limits from a targeted search for extragalactic transients

NEW-MUSIC: The Next-generation Extended-Wavelength MUltiband Sub/millimeter Inductance Camera

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