Haley Gomez | Cardiff University (original) (raw)

Books by Haley Gomez

Papers by Haley Gomez

ABSTRACT We present the dust properties and star formation histories of local submillimetre-selec... more ABSTRACT We present the dust properties and star formation histories of local submillimetre-selected galaxies, classified by optical morphology. Most of the galaxies are late types and very few are early types. The early-type galaxies (ETGs) that are detected contain as much dust as typical spirals, and form a unique sample that has been blindly selected at submillimetre wavelengths. Additionally, we investigate the properties of the most passive, dusty spirals.

In this paper we will discuss the images of Planetary Nebulae that have recently been obtained wi... more In this paper we will discuss the images of Planetary Nebulae that have recently been obtained with PACS and SPIRE on board the Herschel satellite. This comprises results for NGC 650 (the little Dumbbell nebula), NGC 6853 (the Dumbbell nebula), and NGC 7293 (the Helix nebula).

ABSTRACT CW Leo has been observed six times between October 2009 and June 2012 with the SPIRE ins... more ABSTRACT CW Leo has been observed six times between October 2009 and June 2012 with the SPIRE instrument on board the Herschel satellite. Variability has been detected in the flux emitted by the central star with a period of 639±4 days, in good agreement with determinations in the literature. Variability is also detected in the bow shock around CW Leo that had previously been detected in the ultraviolet and Herschel PACS/SPIRE data.

ABSTRACT. The Herschel ATLAS is the largest open-time key project that will be carried out on the... more ABSTRACT. The Herschel ATLAS is the largest open-time key project that will be carried out on the Herschel Space Observatory. It will survey 570 deg2 de g 2 of the extragalactic sky, 4 times larger than all the other Herschel extragalactic surveys combined, in five far-infrared and submillimeter bands. We describe the survey, the complementary multiwavelength data sets that will be combined with the Herschel data, and the six major science programs we are undertaking.

***--ABSTRACT--*** Grains play an important role in the physics and chemistry of planetary nebula... more ***--ABSTRACT--*** Grains play an important role in the physics and chemistry of planetary nebulae (PNe). In this poster we present Herschel images of the dust around PNe, taken as part of the MESS Key Programme, which is looking at mass loss from evolved stars in the Galaxy. Van Hoof et al.(2010) studied the formation of H2 grains in NGC 6720; the strikingly similar morphology of the PACS images and the ground-based H2 images suggests an intimate link between the dust and gas.

ABSTRACT We performed Spitzer Infrared Spectrograph mapping observations covering nearly the enti... more ABSTRACT We performed Spitzer Infrared Spectrograph mapping observations covering nearly the entire extent of the Cassiopeia A supernova remnant (SNR), producing mid-infrared (5.5-35 μm) spectra every 5''-10''. Gas lines of Ar, Ne, O, Si, S, and Fe, and dust continua were strong for most positions. We identify three distinct ejecta dust populations based on their continuum shapes. The dominant dust continuum shape exhibits a strong peak at 21 μm.

Abstract Using the 3.5-m Herschel Space Observatory, imaging photometry of Cas A has been obtaine... more Abstract Using the 3.5-m Herschel Space Observatory, imaging photometry of Cas A has been obtained in six bands between 70 and 500 μm with the PACS and SPIRE instruments, with angular resolutions ranging from 6 to 37”. In the outer regions of the remnant the 70-μm PACS image resembles the 24-μm image Spitzer image, with the emission attributed to the same warm dust component, located in the reverse shock region.

ABSTRACT The standard method for estimating the mass of the interstellar medium (ISM) in a galaxy... more ABSTRACT The standard method for estimating the mass of the interstellar medium (ISM) in a galaxy is to use the 21 cm line to trace the atomic gas and the CO 1-0 line to trace the molecular gas. In this paper, we investigate the alternative technique of using the continuum dust emission to estimate the mass of gas in all phases of the ISM.

Abstract M 82 is a unique representative of a whole class of galaxies, starbursts with superwinds... more Abstract M 82 is a unique representative of a whole class of galaxies, starbursts with superwinds, in the Very Nearby Galaxy Survey with Herschel. In addition, its interaction with the M 81 group has stripped a significant portion of its interstellar medium from its disk. SPIRE maps now afford better characterization of the far-infrared emission from cool dust outside the disk, and sketch a far more complete picture of its mass distribution and energetics than previously possible.

ABSTRACT We study the spectral energy distribution (SED) and the power spectrum of Galactic cirru... more ABSTRACT We study the spectral energy distribution (SED) and the power spectrum of Galactic cirrus emission observed in the 14 deg 2 Science Demonstration Phase field of the Herschel-ATLAS using Herschel and IRAS data from 100 to 500 μ m. We compare the Spectral and Photometric Imaging Receiver (SPIRE) 250, 350 and 500 μm maps with IRAS 100-μm emission, binned in 6-arcmin pixels.

Abstract Herschel PACS and SPIRE images have been obtained of NGC 6720 (the Ring nebula). This is... more Abstract Herschel PACS and SPIRE images have been obtained of NGC 6720 (the Ring nebula). This is an evolved planetary nebula with a central star that is currently on the cooling track, due to which the outer parts of the nebula are recombining. From the PACS and SPIRE images we conclude that there is a striking resemblance between the dust distribution and the H 2 emission, which appears to be observational evidence that H 2 forms on grain surfaces.

ABSTRACT We present the first results of a multiwavelength survey, incorporating Herschel-inline ... more ABSTRACT We present the first results of a multiwavelength survey, incorporating Herschel-inline image, Spitzer, GALEX and Australian Telescope Compact Array (ATCA) observations, of a 1× 1 field centred on Centaurus A. As well as detecting the inner lobes of the active galactic nucleus (AGN) jet and counterjet, we have found two clouds, bright at submillimetre wavelengths,∼ 15 kpc from the centre of Cen A that are co-aligned with the jets.

Abstract Context. The interaction between stellar winds and the interstellar medium (ISM) can cre... more Abstract Context. The interaction between stellar winds and the interstellar medium (ISM) can create complex bow shocks. The photometers on board the Herschel Space Observatory are ideally suited to studying the morphologies of these bow shocks. Aims. We aim to study the circumstellar environment and wind-ISM interaction of the nearest red supergiant, Betelgeuse. Methods.

Abstract: Large amounts of dust have recently been discovered in high-z galaxies and QSOs. The st... more Abstract: Large amounts of dust have recently been discovered in high-z galaxies and QSOs. The stellar winds produced by AGB stars are thought to be the main source of dust in galaxies, but they cannot produce that dust on a short enough timescale (< 1 Gyr) to explain the results in the high-z galaxies. Supernova explosions of massive stars (TypeII) are also a potential source, with models predicting 0.2-4 Msun of dust from each.

ABSTRACT We use the Herschel-ATLAS survey to conduct the first large-scale statistical study of t... more ABSTRACT We use the Herschel-ATLAS survey to conduct the first large-scale statistical study of the submillimetre properties of optically selected galaxies. Using∼ 80 000 r-band selected galaxies from 126 deg 2 of the GAMA survey, we stack into submillimetre imaging at 250, 350 and 500 μ m to gain unprecedented statistics on the dust emission from galaxies at z< 0.35.

Abstract: The interstellar medium is enriched primarily by matter ejected from evolved low and in... more Abstract: The interstellar medium is enriched primarily by matter ejected from evolved low and intermediate mass stars. The outflows from these stars create a circumstellar envelope in which a rich gas-phase and dust-nucleation chemistry takes place. We observed the nearest carbon-rich evolved star, IRC+ 10216, using the PACS (55-210 {\ mu} m) and SPIRE (194-672 {\ mu} m) spectrometers on board Herschel. We find several tens of lines from SiS and SiO, including lines from the v= 1 vibrational level.

ABSTRACT We present the dust properties and star formation histories of local submillimetre-selec... more ABSTRACT We present the dust properties and star formation histories of local submillimetre-selected galaxies, classified by optical morphology. Most of the galaxies are late types and very few are early types. The early-type galaxies (ETGs) that are detected contain as much dust as typical spirals, and form a unique sample that has been blindly selected at submillimetre wavelengths. Additionally, we investigate the properties of the most passive, dusty spirals.

In this paper we will discuss the images of Planetary Nebulae that have recently been obtained wi... more In this paper we will discuss the images of Planetary Nebulae that have recently been obtained with PACS and SPIRE on board the Herschel satellite. This comprises results for NGC 650 (the little Dumbbell nebula), NGC 6853 (the Dumbbell nebula), and NGC 7293 (the Helix nebula).

ABSTRACT CW Leo has been observed six times between October 2009 and June 2012 with the SPIRE ins... more ABSTRACT CW Leo has been observed six times between October 2009 and June 2012 with the SPIRE instrument on board the Herschel satellite. Variability has been detected in the flux emitted by the central star with a period of 639±4 days, in good agreement with determinations in the literature. Variability is also detected in the bow shock around CW Leo that had previously been detected in the ultraviolet and Herschel PACS/SPIRE data.

ABSTRACT. The Herschel ATLAS is the largest open-time key project that will be carried out on the... more ABSTRACT. The Herschel ATLAS is the largest open-time key project that will be carried out on the Herschel Space Observatory. It will survey 570 deg2 de g 2 of the extragalactic sky, 4 times larger than all the other Herschel extragalactic surveys combined, in five far-infrared and submillimeter bands. We describe the survey, the complementary multiwavelength data sets that will be combined with the Herschel data, and the six major science programs we are undertaking.

***--ABSTRACT--*** Grains play an important role in the physics and chemistry of planetary nebula... more ***--ABSTRACT--*** Grains play an important role in the physics and chemistry of planetary nebulae (PNe). In this poster we present Herschel images of the dust around PNe, taken as part of the MESS Key Programme, which is looking at mass loss from evolved stars in the Galaxy. Van Hoof et al.(2010) studied the formation of H2 grains in NGC 6720; the strikingly similar morphology of the PACS images and the ground-based H2 images suggests an intimate link between the dust and gas.

ABSTRACT We performed Spitzer Infrared Spectrograph mapping observations covering nearly the enti... more ABSTRACT We performed Spitzer Infrared Spectrograph mapping observations covering nearly the entire extent of the Cassiopeia A supernova remnant (SNR), producing mid-infrared (5.5-35 μm) spectra every 5''-10''. Gas lines of Ar, Ne, O, Si, S, and Fe, and dust continua were strong for most positions. We identify three distinct ejecta dust populations based on their continuum shapes. The dominant dust continuum shape exhibits a strong peak at 21 μm.

Abstract Using the 3.5-m Herschel Space Observatory, imaging photometry of Cas A has been obtaine... more Abstract Using the 3.5-m Herschel Space Observatory, imaging photometry of Cas A has been obtained in six bands between 70 and 500 μm with the PACS and SPIRE instruments, with angular resolutions ranging from 6 to 37”. In the outer regions of the remnant the 70-μm PACS image resembles the 24-μm image Spitzer image, with the emission attributed to the same warm dust component, located in the reverse shock region.

ABSTRACT The standard method for estimating the mass of the interstellar medium (ISM) in a galaxy... more ABSTRACT The standard method for estimating the mass of the interstellar medium (ISM) in a galaxy is to use the 21 cm line to trace the atomic gas and the CO 1-0 line to trace the molecular gas. In this paper, we investigate the alternative technique of using the continuum dust emission to estimate the mass of gas in all phases of the ISM.

Abstract M 82 is a unique representative of a whole class of galaxies, starbursts with superwinds... more Abstract M 82 is a unique representative of a whole class of galaxies, starbursts with superwinds, in the Very Nearby Galaxy Survey with Herschel. In addition, its interaction with the M 81 group has stripped a significant portion of its interstellar medium from its disk. SPIRE maps now afford better characterization of the far-infrared emission from cool dust outside the disk, and sketch a far more complete picture of its mass distribution and energetics than previously possible.

ABSTRACT We study the spectral energy distribution (SED) and the power spectrum of Galactic cirru... more ABSTRACT We study the spectral energy distribution (SED) and the power spectrum of Galactic cirrus emission observed in the 14 deg 2 Science Demonstration Phase field of the Herschel-ATLAS using Herschel and IRAS data from 100 to 500 μ m. We compare the Spectral and Photometric Imaging Receiver (SPIRE) 250, 350 and 500 μm maps with IRAS 100-μm emission, binned in 6-arcmin pixels.

Abstract Herschel PACS and SPIRE images have been obtained of NGC 6720 (the Ring nebula). This is... more Abstract Herschel PACS and SPIRE images have been obtained of NGC 6720 (the Ring nebula). This is an evolved planetary nebula with a central star that is currently on the cooling track, due to which the outer parts of the nebula are recombining. From the PACS and SPIRE images we conclude that there is a striking resemblance between the dust distribution and the H 2 emission, which appears to be observational evidence that H 2 forms on grain surfaces.

ABSTRACT We present the first results of a multiwavelength survey, incorporating Herschel-inline ... more ABSTRACT We present the first results of a multiwavelength survey, incorporating Herschel-inline image, Spitzer, GALEX and Australian Telescope Compact Array (ATCA) observations, of a 1× 1 field centred on Centaurus A. As well as detecting the inner lobes of the active galactic nucleus (AGN) jet and counterjet, we have found two clouds, bright at submillimetre wavelengths,∼ 15 kpc from the centre of Cen A that are co-aligned with the jets.

Abstract Context. The interaction between stellar winds and the interstellar medium (ISM) can cre... more Abstract Context. The interaction between stellar winds and the interstellar medium (ISM) can create complex bow shocks. The photometers on board the Herschel Space Observatory are ideally suited to studying the morphologies of these bow shocks. Aims. We aim to study the circumstellar environment and wind-ISM interaction of the nearest red supergiant, Betelgeuse. Methods.

Abstract: Large amounts of dust have recently been discovered in high-z galaxies and QSOs. The st... more Abstract: Large amounts of dust have recently been discovered in high-z galaxies and QSOs. The stellar winds produced by AGB stars are thought to be the main source of dust in galaxies, but they cannot produce that dust on a short enough timescale (< 1 Gyr) to explain the results in the high-z galaxies. Supernova explosions of massive stars (TypeII) are also a potential source, with models predicting 0.2-4 Msun of dust from each.

ABSTRACT We use the Herschel-ATLAS survey to conduct the first large-scale statistical study of t... more ABSTRACT We use the Herschel-ATLAS survey to conduct the first large-scale statistical study of the submillimetre properties of optically selected galaxies. Using∼ 80 000 r-band selected galaxies from 126 deg 2 of the GAMA survey, we stack into submillimetre imaging at 250, 350 and 500 μ m to gain unprecedented statistics on the dust emission from galaxies at z< 0.35.

Abstract: The interstellar medium is enriched primarily by matter ejected from evolved low and in... more Abstract: The interstellar medium is enriched primarily by matter ejected from evolved low and intermediate mass stars. The outflows from these stars create a circumstellar envelope in which a rich gas-phase and dust-nucleation chemistry takes place. We observed the nearest carbon-rich evolved star, IRC+ 10216, using the PACS (55-210 {\ mu} m) and SPIRE (194-672 {\ mu} m) spectrometers on board Herschel. We find several tens of lines from SiS and SiO, including lines from the v= 1 vibrational level.

Abstract: By combining Herschel-SPIRE data with archival Spitzer, HI, and CO maps, we investigate... more Abstract: By combining Herschel-SPIRE data with archival Spitzer, HI, and CO maps, we investigate the spatial distribution of gas and dust in the two famous grand-design spirals M99 and M100 in the Virgo cluster. Thanks to the unique resolution and sensitivity of the Herschel-SPIRE photometer, we are for the first time able to measure the distribution and extent of cool, submillimetre (submm)-emitting dust inside and beyond the optical radius. We compare this with the radial variation in both the gas mass and the metallicity.

Abstract: We use the Herschel-ATLAS survey to conduct the first large-scale statistical study of ... more Abstract: We use the Herschel-ATLAS survey to conduct the first large-scale statistical study of the sub-mm properties of optically selected galaxies. Using~ 80,000 r-band selected galaxies from 126 deg^ 2 of the GAMA survey, we stack into sub-mm imaging at 250, 350 and 500 {\ mu} m to gain unprecedented statistics on the dust emission from galaxies at z< 0.35.

Abstract: It has often been suggested that an alternative to the standard CO/21-cm method for est... more Abstract: It has often been suggested that an alternative to the standard CO/21-cm method for estimating the mass of the interstellar medium (ISM) in a galaxy might be to estimate the mass of the ISM from the continuum dust emission. In this paper, we investigate the potential of this technique using Herschel observations of ten galaxies in the Herschel Reference Survey and in the Herschel Virgo Cluster Survey.

ABSTRACT We present a three-dimensional analysis of the supernova remnant Cassiopeia A using high... more ABSTRACT We present a three-dimensional analysis of the supernova remnant Cassiopeia A using high-resolution spectra from the Spitzer Space Telescope. We observe supernova ejecta both immediately before and during the shock-ejecta interaction. We determine that the reverse shock of the remnant is spherical to within 7%, although the center of this sphere is offset from the geometric center of the remnant by 810 km s–1.