astropy/photutils: 1.0.0

Bradley, Larry; Sipőcz, Brigitta; Robitaille, Thomas; Tollerud, Erik; Vinícius, Zé; Deil, C.; Barbary, Kyle; Wilson, Tom J.; Busko, I.; Günther, Hans Moritz; Cara, Mihai; Conseil, Simon; Bostroem, Azalee; Droettboom, Michael; Bray, E. M.; Bratholm, Lars Andersen; Lim, P. L.; Barentsen, Geert; Craig, Matt; Pascual, S.; Perren, G. I.; Greco, Johnny P.; Donath, Axel; Val-Borro, Miguel de; Kerzendorf, Wolfgang; Bach, Yoonsoo P.; Weaver, B. A.; D’Eugenio, Francesco; Souchereau, Harrison; Ferreira, Leonardo

doi:10.5281/zenodo.4044744

Cited by 217 publications

(84 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…First we use - (Bertin & Arnouts 1996) to generate segmentation maps, from these maps we construct the masks simply by removing the galaxy segmentation in each image. We identify the centre of the galaxies as the brightest pixel inside their segmentation and use it as a first guess for the fitting of elliptical isophotes with isophotal analysis routines (Bradley et al 2020). Once the models capture the overall brightness distribution in the data, we estimate the mean ellipticity (𝜖) and position angle (PA) from the model elliptical isophotes, excluding the innermost and outermost ellipses.…”

Section: Photometric Methodsmentioning

confidence: 99%

Relic galaxy analogues in Illustris TNG50: the formation pathways of surviving red nuggets in a cosmological simulation

Flores-Freitas,

Chies-Santos,

Furlanetto

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Relic galaxies are massive compact quiescent galaxies that formed at high-redshift and remained almost unchanged since then. In this work, we search for analogues to relic galaxies in the TNG50 cosmological simulations to understand relic formation and test the ability of TNG50 to reproduce such rare objects. Using stellar mass, age, radius, quiescence and stellar assembly criteria, we find 5 subhalos in TNG50 that could be potential relic analogues. We compare their properties with other constraints imposed by a sample of 13 observed relic galaxies. We find one analogue in TNG50 that simultaneously satisfies most of the available observational constraints, such as metallicity and morphology. It also shows similarities to the confirmed relic NGC 1277, regarding environment and dark matter fraction. By taking into account a degree of relicness, a second relic analogue may also be considered. However, the central parts of the brightness and density profiles of the analogues are less steep than that of real relic galaxies, possibly due to limited numerical resolution. We identify two formation pathways of relic analogues in TNG50 depending on their environment: they either have their remaining gas stripped during the infall into a cluster at 𝑧 1.2 or consume it before 𝑧 > 1.5. They are then deprived of significant star formation, leaving their stellar populations almost unaltered during the last 9 Gyr. We also find that the analogue progenitors at 𝑧 ∼ 4 inhabit more massive halos than progenitors of quiescent galaxies with similar stellar mass at 𝑧 ∼ 0.

show abstract

Section: Photometric Methodsmentioning

confidence: 99%

Relic galaxy analogues in Illustris TNG50: the formation pathways of surviving red nuggets in a cosmological simulation

Flores-Freitas,

Chies-Santos,

Furlanetto

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Gravitational-wave Optical Transient Observer (GOTO) project acknowledges the support of the Monash This research has made use of data and/or services provided by the International Astronomical Union's Minor Planet Center. This research has also made use of the following Python packages: Astropy (Astropy Collaboration et al 2013, numpy (Harris et al 2020), scipy (Virtanen et al 2020), healpy (Zonca et al 2019), Astrolib PySynphot (Lim et al 2015), astroplan (Morris et al 2018), pandas (McKinney et al 2010, photutils (Bradley et al 2020), and scikitlearn (Pedregosa et al 2011).…”

Section: Acknowledgementsmentioning

confidence: 99%

The Gravitational-wave Optical Transient Observer (GOTO): prototype performance and prospects for transient science

Steeghs

Galloway

Ackley

et al. 2022

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The Gravitational-wave Optical Transient Observer (GOTO) is an array of wide-field optical telescopes, designed to exploit new discoveries from the next generation of gravitational wave detectors (LIGO, Virgo, KAGRA), study rapidly evolving transients, and exploit multimessenger opportunities arising from neutrino and very high energy gamma-ray triggers. In addition to a rapid response mode, the array will also perform a sensitive, all-sky transient survey with few day cadence. The facility features a novel, modular design with multiple 40-cm wide-field reflectors on a single mount. In June 2017 the GOTO collaboration deployed the initial project prototype, with 4 telescope units, at the Roque de los Muchachos Observatory (ORM), La Palma, Canary Islands. Here we describe the deployment, commissioning, and performance of the prototype hardware, and discuss the impact of these findings on the final GOTO design. We also offer an initial assessment of the science prospects for the full GOTO facility that employs 32 telescope units across two sites.

show abstract

“…We download the 𝑔, 𝑟 and 𝑖-band images of each Pan-STARRS skycell. Then, we detect all objects in the 𝑟 band with the detect_source function of the library (Bradley et al 2020) in . To meet our detection threshold, an object must be at least 48 pixels in length with at least 15 connected pixels above 4 standard deviations of the background level.…”

Section: Candidate Selection From the Pan-starrs Imagesmentioning

confidence: 99%

“…The catalogue of edge-on galaxy candidates consists of a number of tables (Makarov & Antipova 2021, Section 2.4). The list of candidates was prepared using the library (Bradley et al 2020) as described in Section 2. In total, it contains 22,727 genuine galaxies.…”

Section: Database and Cataloguementioning

confidence: 99%

The Edge-on Galaxies in the Pan-STARRS survey (EGIPS)

Makarov,

Savchenko,

Mosenkov

et al. 2022

Preprint

View full text Add to dashboard Cite

We present a catalogue of 16,551 edge-on galaxies created using the public DR2 data of the Pan-STARRS survey. The catalogue covers the three quarters of the sky above Dec. = −30 • . The galaxies were selected using a convolutional neural network, trained on a sample of edge-on galaxies identified earlier in the SDSS survey. This approach allows us to dramatically improve the quality of the candidate selection and perform a thorough visual inspection in a reasonable amount of time. The catalogue provides homogeneous information on astrometry, SE photometry, and non-parametric morphological statistics of the galaxies. The photometry is reliably for objects in the 13.8-17.4 𝑟-band magnitude range. According to the HyperLeda database, redshifts are known for about 63 percent of the galaxies in the catalogue. Our sample is well separated into the red sequence and blue cloud galaxy populations. The edge-on galaxies of the red sequence are systematically Δ(𝑔 − 𝑖) ≈ 0.1 mag redder than galaxies oriented at an arbitrary angle to the observer. We found a variation of the galaxy thickness with the galaxy colour. The red sequence galaxies are thicker than the galaxies of the blue cloud. In the blue cloud, on average, thinner galaxies turn out to be bluer. In the future, based on this catalogue it is intended to explore the three-dimensional structure of galaxies of different morphologies, as well as to study the scaling relations for discs and bulges.

show abstract

astropy/photutils: 1.0.0

Cited by 217 publications

References 0 publications

Relic galaxy analogues in Illustris TNG50: the formation pathways of surviving red nuggets in a cosmological simulation

Relic galaxy analogues in Illustris TNG50: the formation pathways of surviving red nuggets in a cosmological simulation

The Gravitational-wave Optical Transient Observer (GOTO): prototype performance and prospects for transient science

The Edge-on Galaxies in the Pan-STARRS survey (EGIPS)

Contact Info

Product

Resources

About