A Deviant Insider

Downes, Gareth; Schwarze, Tracey Teets; Spurr, David; Ungar, Andras

doi:10.2307/29736147

Cited by 6 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To avoid the blending issue, we match the catalogue from the Spitzer/MIPS 24µm catalogue (beam size 6") to the 8µm catalogue (2" resolution), then match the 8µm counterparts from the CANDELS F160W band selected catalogue, so that one 24µm target will have at most one optical counterpart. For the catalogue-matching process, we consider the corrected-Poissonian probability, or the p-values (Downes et al 1986). We can see that nearly all the galaxies with a stellar mass lower than 10 8 M ⊙ are not detected in the 24µm image.…”

Section: Resultsmentioning

confidence: 99%

UV and NIR size of the low-mass field galaxies: the UV compact galaxies

Cheng

Xie

et al. 2020

A&A

View full text Add to dashboard Cite

Context. Most of the massive star-forming galaxies are found to have 'inside-out' stellar mass growth modes, which means the inner parts of the galaxies mainly consist of the older stellar population, while the star forming in the outskirt of the galaxy is still ongoing. Aims. The high-resolution HST images from Hubble Deep UV Legacy Survey (HDUV) and Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) projects with the unprecedented depth in both F275W and F160W bands are the perfect data sets to study the forming and formed stellar distribution directly. Methods. We selected the low redshift (0.05 < z spec < 0.3) galaxy sample from the GOODS-North field where the HST F275W and F160W images are available. Then we measured the half light radius in F275W and F160W bands, which are the indicators of the star formation and stellar mass. Results. By comparing the F275W and F160W half light radius, we find the massive galaxies are mainly follow the 'inside-out' growth mode, which is consistent with the previous results. Moreover, the HST F275W and F160W images reveal that some of the low-mass galaxies (< 10 8 M ⊙ ) have the 'outside-in' growth mode: their images show a compact UV morphology, implying an ongoing star formation in the galaxy centre, while the stars in the outskirts of the galaxies are already formed. The two modes transit smoothly at stellar mass range about 10 8−9 M ⊙ with a large scatter. We also try to identify the possible neighbour massive galaxies from the SDSS data, which represent the massive galaxy sample. We find that all of the spec-z selected galaxies have no massive galaxy nearby. Thus the 'outside-in' mode we find in the low-mass galaxies are not likely originated from the environment.

show abstract

Section: Resultsmentioning

confidence: 99%

UV and NIR size of the low-mass field galaxies: the UV compact galaxies

Cheng

Xie

et al. 2020

A&A

View full text Add to dashboard Cite

show abstract

“…We start by identifying the radio counterparts to the SPIRE sources. We used the p statistics (Downes et al 1986) to quantify the likelihood of a radio source being a chance association to the SPIRE source. This procedure is more appropriate to identify radio counterparts than the LR method, since the surface density of radio sources is much lower than the optical and NIR catalogues.…”

Section: Radio Counterparts To Submm Sourcesmentioning

confidence: 99%

The second Herschel–ATLAS Data Release – III. Optical and near-infrared counterparts in the North Galactic Plane field

Furlanetto

Dye

Bourne

et al. 2018

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

This paper forms part of the second major public data release of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). In this work, we describe the identification of optical and near-infrared counterparts to the submillimetre detected sources in the 177 deg2 North Galactic Plane (NGP) field. We used the likelihood ratio method to identify counterparts in the Sloan Digital Sky Survey and in the United Kingdom InfraRed Telescope Imaging Deep Sky Survey within a search radius of 10 arcsec of the H-ATLAS sources with a 4σ detection at 250 μm. We obtained reliable (R ≥ 0.8) optical counterparts with r < 22.4 for 42 429 H-ATLAS sources (37.8 per cent), with an estimated completeness of 71.7 per cent and a false identification rate of 4.7 per cent. We also identified counterparts in the near-infrared using deeper K-band data which covers a smaller ∼25 deg2. We found reliable near-infrared counterparts to 61.8 per cent of the 250-μm-selected sources within that area. We assessed the performance of the likelihood ratio method to identify optical and near-infrared counterparts taking into account the depth and area of both input catalogues. Using catalogues with the same surface density of objects in the overlapping ∼25 deg2 area, we obtained that the reliable fraction in the near-infrared (54.8 per cent) is significantly higher than in the optical (36.4 per cent). Finally, using deep radio data which covers a small region of the NGP field, we found that 80–90 per cent of our reliable identifications are correct.

show abstract

“…Ivison et al 2007). We have chosen to cross-match the parent SMG catalogue with our radio maps (Section 2.2) using a P < 0.05 selection criterion, meaning that the probability of a spurious association is less than 5 per cent (Downes et al 1986). This probability has two dependencies -the radius within which we search for radio counterparts and the cumulative radio source number count distribution per surface unit, N (>S).…”

Section: Radio Identificationsmentioning

confidence: 99%

Deep multi-frequency radio imaging in the Lockman Hole — II. The spectral index of submillimetre galaxies

Ibar

Ivison

Best

et al. 2010

Monthly Notices of the Royal Astronomical Society: Letters

106

105

View full text Add to dashboard Cite

We have employed the Giant Metre‐wave Radio Telescope and the Very Large Array to map the Lockman Hole. At 610 and 1400 MHz, we reach noise levels of 15 and 6 μJy beam−1, respectively, with well‐matched resolutions (∼5 arcsec). At this depth, we obtained reliable detections for about half of the known sub‐mm galaxies (SMGs) in the field. For radio‐identified SMGs, which are typically at z∼ 2, we measure a mean radio spectral index of α1400610=−0.75 ± 0.06 (where Sν∝να) and standard deviation of 0.29, between approximate rest‐frame frequencies of 1.8 and 4.2 GHz. The slope of their continuum emission is indistinguishable from that of local star‐forming galaxies and suggests that extended optically thin synchrotron emission dominates the radio output of SMGs. Cooling effects by synchrotron emission and Inverse Compton scattering off the cosmic microwave background do not seem to affect their radio spectral energy distributions. For those SMGs judged by Spitzer mid‐infrared colours and spectroscopy to host obscured active galactic nuclei (AGN), we find a clear deviation from the rest of the sample – they typically have steeper radio spectral indices, α1400610≲−1.0. These findings suggest these mid‐IR‐/AGN‐selected SMGs may have an intrinsically different injection mechanism for relativistic particles, or they might reside in denser environments. This work provides a reliable spectral template for the estimation of far‐IR/radio photometric redshifts, and will enable accurate statistical K‐corrections for the large samples of SMGs expected with SCUBA‐2 and Herschel.

show abstract

A Deviant Insider

Cited by 6 publications

References 0 publications

UV and NIR size of the low-mass field galaxies: the UV compact galaxies

UV and NIR size of the low-mass field galaxies: the UV compact galaxies

The second Herschel–ATLAS Data Release – III. Optical and near-infrared counterparts in the North Galactic Plane field

Deep multi-frequency radio imaging in the Lockman Hole — II. The spectral index of submillimetre galaxies

Contact Info

Product

Resources

About